Remove LLVM 8.0.1 files.

1 files changed, 0 insertions, 9434 deletions

diff --git a/gnu/llvm/tools/clang/lib/Sema/SemaInit.cpp b/gnu/llvm/tools/clang/lib/Sema/SemaInit.cpp
deleted file mode 100644
index 10c0c6bf33b..00000000000
--- a/gnu/llvm/tools/clang/lib/Sema/SemaInit.cpp
+++ /dev/null
@@ -1,9434 +0,0 @@
-//===--- SemaInit.cpp - Semantic Analysis for Initializers ----------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements semantic analysis for initializers.
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/AST/ASTContext.h"
-#include "clang/AST/DeclObjC.h"
-#include "clang/AST/ExprCXX.h"
-#include "clang/AST/ExprObjC.h"
-#include "clang/AST/ExprOpenMP.h"
-#include "clang/AST/TypeLoc.h"
-#include "clang/Basic/TargetInfo.h"
-#include "clang/Sema/Designator.h"
-#include "clang/Sema/Initialization.h"
-#include "clang/Sema/Lookup.h"
-#include "clang/Sema/SemaInternal.h"
-#include "llvm/ADT/APInt.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/raw_ostream.h"
-
-using namespace clang;
-
-//===----------------------------------------------------------------------===//
-// Sema Initialization Checking
-//===----------------------------------------------------------------------===//
-
-/// Check whether T is compatible with a wide character type (wchar_t,
-/// char16_t or char32_t).
-static bool IsWideCharCompatible(QualType T, ASTContext &Context) {
-  if (Context.typesAreCompatible(Context.getWideCharType(), T))
-    return true;
-  if (Context.getLangOpts().CPlusPlus || Context.getLangOpts().C11) {
-    return Context.typesAreCompatible(Context.Char16Ty, T) ||
-           Context.typesAreCompatible(Context.Char32Ty, T);
-  }
-  return false;
-}
-
-enum StringInitFailureKind {
-  SIF_None,
-  SIF_NarrowStringIntoWideChar,
-  SIF_WideStringIntoChar,
-  SIF_IncompatWideStringIntoWideChar,
-  SIF_UTF8StringIntoPlainChar,
-  SIF_PlainStringIntoUTF8Char,
-  SIF_Other
-};
-
-/// Check whether the array of type AT can be initialized by the Init
-/// expression by means of string initialization. Returns SIF_None if so,
-/// otherwise returns a StringInitFailureKind that describes why the
-/// initialization would not work.
-static StringInitFailureKind IsStringInit(Expr *Init, const ArrayType *AT,
-                                          ASTContext &Context) {
-  if (!isa<ConstantArrayType>(AT) && !isa<IncompleteArrayType>(AT))
-    return SIF_Other;
-
-  // See if this is a string literal or @encode.
-  Init = Init->IgnoreParens();
-
-  // Handle @encode, which is a narrow string.
-  if (isa<ObjCEncodeExpr>(Init) && AT->getElementType()->isCharType())
-    return SIF_None;
-
-  // Otherwise we can only handle string literals.
-  StringLiteral *SL = dyn_cast<StringLiteral>(Init);
-  if (!SL)
-    return SIF_Other;
-
-  const QualType ElemTy =
-      Context.getCanonicalType(AT->getElementType()).getUnqualifiedType();
-
-  switch (SL->getKind()) {
-  case StringLiteral::UTF8:
-    // char8_t array can be initialized with a UTF-8 string.
-    if (ElemTy->isChar8Type())
-      return SIF_None;
-    LLVM_FALLTHROUGH;
-  case StringLiteral::Ascii:
-    // char array can be initialized with a narrow string.
-    // Only allow char x[] = "foo";  not char x[] = L"foo";
-    if (ElemTy->isCharType())
-      return (SL->getKind() == StringLiteral::UTF8 &&
-              Context.getLangOpts().Char8)
-                 ? SIF_UTF8StringIntoPlainChar
-                 : SIF_None;
-    if (ElemTy->isChar8Type())
-      return SIF_PlainStringIntoUTF8Char;
-    if (IsWideCharCompatible(ElemTy, Context))
-      return SIF_NarrowStringIntoWideChar;
-    return SIF_Other;
-  // C99 6.7.8p15 (with correction from DR343), or C11 6.7.9p15:
-  // "An array with element type compatible with a qualified or unqualified
-  // version of wchar_t, char16_t, or char32_t may be initialized by a wide
-  // string literal with the corresponding encoding prefix (L, u, or U,
-  // respectively), optionally enclosed in braces.
-  case StringLiteral::UTF16:
-    if (Context.typesAreCompatible(Context.Char16Ty, ElemTy))
-      return SIF_None;
-    if (ElemTy->isCharType() || ElemTy->isChar8Type())
-      return SIF_WideStringIntoChar;
-    if (IsWideCharCompatible(ElemTy, Context))
-      return SIF_IncompatWideStringIntoWideChar;
-    return SIF_Other;
-  case StringLiteral::UTF32:
-    if (Context.typesAreCompatible(Context.Char32Ty, ElemTy))
-      return SIF_None;
-    if (ElemTy->isCharType() || ElemTy->isChar8Type())
-      return SIF_WideStringIntoChar;
-    if (IsWideCharCompatible(ElemTy, Context))
-      return SIF_IncompatWideStringIntoWideChar;
-    return SIF_Other;
-  case StringLiteral::Wide:
-    if (Context.typesAreCompatible(Context.getWideCharType(), ElemTy))
-      return SIF_None;
-    if (ElemTy->isCharType() || ElemTy->isChar8Type())
-      return SIF_WideStringIntoChar;
-    if (IsWideCharCompatible(ElemTy, Context))
-      return SIF_IncompatWideStringIntoWideChar;
-    return SIF_Other;
-  }
-
-  llvm_unreachable("missed a StringLiteral kind?");
-}
-
-static StringInitFailureKind IsStringInit(Expr *init, QualType declType,
-                                          ASTContext &Context) {
-  const ArrayType *arrayType = Context.getAsArrayType(declType);
-  if (!arrayType)
-    return SIF_Other;
-  return IsStringInit(init, arrayType, Context);
-}
-
-/// Update the type of a string literal, including any surrounding parentheses,
-/// to match the type of the object which it is initializing.
-static void updateStringLiteralType(Expr *E, QualType Ty) {
-  while (true) {
-    E->setType(Ty);
-    if (isa<StringLiteral>(E) || isa<ObjCEncodeExpr>(E))
-      break;
-    else if (ParenExpr *PE = dyn_cast<ParenExpr>(E))
-      E = PE->getSubExpr();
-    else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E))
-      E = UO->getSubExpr();
-    else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E))
-      E = GSE->getResultExpr();
-    else
-      llvm_unreachable("unexpected expr in string literal init");
-  }
-}
-
-static void CheckStringInit(Expr *Str, QualType &DeclT, const ArrayType *AT,
-                            Sema &S) {
-  // Get the length of the string as parsed.
-  auto *ConstantArrayTy =
-      cast<ConstantArrayType>(Str->getType()->getAsArrayTypeUnsafe());
-  uint64_t StrLength = ConstantArrayTy->getSize().getZExtValue();
-
-  if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) {
-    // C99 6.7.8p14. We have an array of character type with unknown size
-    // being initialized to a string literal.
-    llvm::APInt ConstVal(32, StrLength);
-    // Return a new array type (C99 6.7.8p22).
-    DeclT = S.Context.getConstantArrayType(IAT->getElementType(),
-                                           ConstVal,
-                                           ArrayType::Normal, 0);
-    updateStringLiteralType(Str, DeclT);
-    return;
-  }
-
-  const ConstantArrayType *CAT = cast<ConstantArrayType>(AT);
-
-  // We have an array of character type with known size.  However,
-  // the size may be smaller or larger than the string we are initializing.
-  // FIXME: Avoid truncation for 64-bit length strings.
-  if (S.getLangOpts().CPlusPlus) {
-    if (StringLiteral *SL = dyn_cast<StringLiteral>(Str->IgnoreParens())) {
-      // For Pascal strings it's OK to strip off the terminating null character,
-      // so the example below is valid:
-      //
-      // unsigned char a[2] = "\pa";
-      if (SL->isPascal())
-        StrLength--;
-    }
-
-    // [dcl.init.string]p2
-    if (StrLength > CAT->getSize().getZExtValue())
-      S.Diag(Str->getBeginLoc(),
-             diag::err_initializer_string_for_char_array_too_long)
-          << Str->getSourceRange();
-  } else {
-    // C99 6.7.8p14.
-    if (StrLength-1 > CAT->getSize().getZExtValue())
-      S.Diag(Str->getBeginLoc(),
-             diag::ext_initializer_string_for_char_array_too_long)
-          << Str->getSourceRange();
-  }
-
-  // Set the type to the actual size that we are initializing.  If we have
-  // something like:
-  //   char x[1] = "foo";
-  // then this will set the string literal's type to char[1].
-  updateStringLiteralType(Str, DeclT);
-}
-
-//===----------------------------------------------------------------------===//
-// Semantic checking for initializer lists.
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-/// Semantic checking for initializer lists.
-///
-/// The InitListChecker class contains a set of routines that each
-/// handle the initialization of a certain kind of entity, e.g.,
-/// arrays, vectors, struct/union types, scalars, etc. The
-/// InitListChecker itself performs a recursive walk of the subobject
-/// structure of the type to be initialized, while stepping through
-/// the initializer list one element at a time. The IList and Index
-/// parameters to each of the Check* routines contain the active
-/// (syntactic) initializer list and the index into that initializer
-/// list that represents the current initializer. Each routine is
-/// responsible for moving that Index forward as it consumes elements.
-///
-/// Each Check* routine also has a StructuredList/StructuredIndex
-/// arguments, which contains the current "structured" (semantic)
-/// initializer list and the index into that initializer list where we
-/// are copying initializers as we map them over to the semantic
-/// list. Once we have completed our recursive walk of the subobject
-/// structure, we will have constructed a full semantic initializer
-/// list.
-///
-/// C99 designators cause changes in the initializer list traversal,
-/// because they make the initialization "jump" into a specific
-/// subobject and then continue the initialization from that
-/// point. CheckDesignatedInitializer() recursively steps into the
-/// designated subobject and manages backing out the recursion to
-/// initialize the subobjects after the one designated.
-class InitListChecker {
-  Sema &SemaRef;
-  bool hadError;
-  bool VerifyOnly; // no diagnostics, no structure building
-  bool TreatUnavailableAsInvalid; // Used only in VerifyOnly mode.
-  llvm::DenseMap<InitListExpr *, InitListExpr *> SyntacticToSemantic;
-  InitListExpr *FullyStructuredList;
-
-  void CheckImplicitInitList(const InitializedEntity &Entity,
-                             InitListExpr *ParentIList, QualType T,
-                             unsigned &Index, InitListExpr *StructuredList,
-                             unsigned &StructuredIndex);
-  void CheckExplicitInitList(const InitializedEntity &Entity,
-                             InitListExpr *IList, QualType &T,
-                             InitListExpr *StructuredList,
-                             bool TopLevelObject = false);
-  void CheckListElementTypes(const InitializedEntity &Entity,
-                             InitListExpr *IList, QualType &DeclType,
-                             bool SubobjectIsDesignatorContext,
-                             unsigned &Index,
-                             InitListExpr *StructuredList,
-                             unsigned &StructuredIndex,
-                             bool TopLevelObject = false);
-  void CheckSubElementType(const InitializedEntity &Entity,
-                           InitListExpr *IList, QualType ElemType,
-                           unsigned &Index,
-                           InitListExpr *StructuredList,
-                           unsigned &StructuredIndex);
-  void CheckComplexType(const InitializedEntity &Entity,
-                        InitListExpr *IList, QualType DeclType,
-                        unsigned &Index,
-                        InitListExpr *StructuredList,
-                        unsigned &StructuredIndex);
-  void CheckScalarType(const InitializedEntity &Entity,
-                       InitListExpr *IList, QualType DeclType,
-                       unsigned &Index,
-                       InitListExpr *StructuredList,
-                       unsigned &StructuredIndex);
-  void CheckReferenceType(const InitializedEntity &Entity,
-                          InitListExpr *IList, QualType DeclType,
-                          unsigned &Index,
-                          InitListExpr *StructuredList,
-                          unsigned &StructuredIndex);
-  void CheckVectorType(const InitializedEntity &Entity,
-                       InitListExpr *IList, QualType DeclType, unsigned &Index,
-                       InitListExpr *StructuredList,
-                       unsigned &StructuredIndex);
-  void CheckStructUnionTypes(const InitializedEntity &Entity,
-                             InitListExpr *IList, QualType DeclType,
-                             CXXRecordDecl::base_class_range Bases,
-                             RecordDecl::field_iterator Field,
-                             bool SubobjectIsDesignatorContext, unsigned &Index,
-                             InitListExpr *StructuredList,
-                             unsigned &StructuredIndex,
-                             bool TopLevelObject = false);
-  void CheckArrayType(const InitializedEntity &Entity,
-                      InitListExpr *IList, QualType &DeclType,
-                      llvm::APSInt elementIndex,
-                      bool SubobjectIsDesignatorContext, unsigned &Index,
-                      InitListExpr *StructuredList,
-                      unsigned &StructuredIndex);
-  bool CheckDesignatedInitializer(const InitializedEntity &Entity,
-                                  InitListExpr *IList, DesignatedInitExpr *DIE,
-                                  unsigned DesigIdx,
-                                  QualType &CurrentObjectType,
-                                  RecordDecl::field_iterator *NextField,
-                                  llvm::APSInt *NextElementIndex,
-                                  unsigned &Index,
-                                  InitListExpr *StructuredList,
-                                  unsigned &StructuredIndex,
-                                  bool FinishSubobjectInit,
-                                  bool TopLevelObject);
-  InitListExpr *getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
-                                           QualType CurrentObjectType,
-                                           InitListExpr *StructuredList,
-                                           unsigned StructuredIndex,
-                                           SourceRange InitRange,
-                                           bool IsFullyOverwritten = false);
-  void UpdateStructuredListElement(InitListExpr *StructuredList,
-                                   unsigned &StructuredIndex,
-                                   Expr *expr);
-  int numArrayElements(QualType DeclType);
-  int numStructUnionElements(QualType DeclType);
-
-  static ExprResult PerformEmptyInit(Sema &SemaRef,
-                                     SourceLocation Loc,
-                                     const InitializedEntity &Entity,
-                                     bool VerifyOnly,
-                                     bool TreatUnavailableAsInvalid);
-
-  // Explanation on the "FillWithNoInit" mode:
-  //
-  // Assume we have the following definitions (Case#1):
-  // struct P { char x[6][6]; } xp = { .x[1] = "bar" };
-  // struct PP { struct P lp; } l = { .lp = xp, .lp.x[1][2] = 'f' };
-  //
-  // l.lp.x[1][0..1] should not be filled with implicit initializers because the
-  // "base" initializer "xp" will provide values for them; l.lp.x[1] will be "baf".
-  //
-  // But if we have (Case#2):
-  // struct PP l = { .lp = xp, .lp.x[1] = { [2] = 'f' } };
-  //
-  // l.lp.x[1][0..1] are implicitly initialized and do not use values from the
-  // "base" initializer; l.lp.x[1] will be "\0\0f\0\0\0".
-  //
-  // To distinguish Case#1 from Case#2, and also to avoid leaving many "holes"
-  // in the InitListExpr, the "holes" in Case#1 are filled not with empty
-  // initializers but with special "NoInitExpr" place holders, which tells the
-  // CodeGen not to generate any initializers for these parts.
-  void FillInEmptyInitForBase(unsigned Init, const CXXBaseSpecifier &Base,
-                              const InitializedEntity &ParentEntity,
-                              InitListExpr *ILE, bool &RequiresSecondPass,
-                              bool FillWithNoInit);
-  void FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
-                               const InitializedEntity &ParentEntity,
-                               InitListExpr *ILE, bool &RequiresSecondPass,
-                               bool FillWithNoInit = false);
-  void FillInEmptyInitializations(const InitializedEntity &Entity,
-                                  InitListExpr *ILE, bool &RequiresSecondPass,
-                                  InitListExpr *OuterILE, unsigned OuterIndex,
-                                  bool FillWithNoInit = false);
-  bool CheckFlexibleArrayInit(const InitializedEntity &Entity,
-                              Expr *InitExpr, FieldDecl *Field,
-                              bool TopLevelObject);
-  void CheckEmptyInitializable(const InitializedEntity &Entity,
-                               SourceLocation Loc);
-
-public:
-  InitListChecker(Sema &S, const InitializedEntity &Entity,
-                  InitListExpr *IL, QualType &T, bool VerifyOnly,
-                  bool TreatUnavailableAsInvalid);
-  bool HadError() { return hadError; }
-
-  // Retrieves the fully-structured initializer list used for
-  // semantic analysis and code generation.
-  InitListExpr *getFullyStructuredList() const { return FullyStructuredList; }
-};
-
-} // end anonymous namespace
-
-ExprResult InitListChecker::PerformEmptyInit(Sema &SemaRef,
-                                             SourceLocation Loc,
-                                             const InitializedEntity &Entity,
-                                             bool VerifyOnly,
-                                             bool TreatUnavailableAsInvalid) {
-  InitializationKind Kind = InitializationKind::CreateValue(Loc, Loc, Loc,
-                                                            true);
-  MultiExprArg SubInit;
-  Expr *InitExpr;
-  InitListExpr DummyInitList(SemaRef.Context, Loc, None, Loc);
-
-  // C++ [dcl.init.aggr]p7:
-  //   If there are fewer initializer-clauses in the list than there are
-  //   members in the aggregate, then each member not explicitly initialized
-  //   ...
-  bool EmptyInitList = SemaRef.getLangOpts().CPlusPlus11 &&
-      Entity.getType()->getBaseElementTypeUnsafe()->isRecordType();
-  if (EmptyInitList) {
-    // C++1y / DR1070:
-    //   shall be initialized [...] from an empty initializer list.
-    //
-    // We apply the resolution of this DR to C++11 but not C++98, since C++98
-    // does not have useful semantics for initialization from an init list.
-    // We treat this as copy-initialization, because aggregate initialization
-    // always performs copy-initialization on its elements.
-    //
-    // Only do this if we're initializing a class type, to avoid filling in
-    // the initializer list where possible.
-    InitExpr = VerifyOnly ? &DummyInitList : new (SemaRef.Context)
-                   InitListExpr(SemaRef.Context, Loc, None, Loc);
-    InitExpr->setType(SemaRef.Context.VoidTy);
-    SubInit = InitExpr;
-    Kind = InitializationKind::CreateCopy(Loc, Loc);
-  } else {
-    // C++03:
-    //   shall be value-initialized.
-  }
-
-  InitializationSequence InitSeq(SemaRef, Entity, Kind, SubInit);
-  // libstdc++4.6 marks the vector default constructor as explicit in
-  // _GLIBCXX_DEBUG mode, so recover using the C++03 logic in that case.
-  // stlport does so too. Look for std::__debug for libstdc++, and for
-  // std:: for stlport.  This is effectively a compiler-side implementation of
-  // LWG2193.
-  if (!InitSeq && EmptyInitList && InitSeq.getFailureKind() ==
-          InitializationSequence::FK_ExplicitConstructor) {
-    OverloadCandidateSet::iterator Best;
-    OverloadingResult O =
-        InitSeq.getFailedCandidateSet()
-            .BestViableFunction(SemaRef, Kind.getLocation(), Best);
-    (void)O;
-    assert(O == OR_Success && "Inconsistent overload resolution");
-    CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
-    CXXRecordDecl *R = CtorDecl->getParent();
-
-    if (CtorDecl->getMinRequiredArguments() == 0 &&
-        CtorDecl->isExplicit() && R->getDeclName() &&
-        SemaRef.SourceMgr.isInSystemHeader(CtorDecl->getLocation())) {
-      bool IsInStd = false;
-      for (NamespaceDecl *ND = dyn_cast<NamespaceDecl>(R->getDeclContext());
-           ND && !IsInStd; ND = dyn_cast<NamespaceDecl>(ND->getParent())) {
-        if (SemaRef.getStdNamespace()->InEnclosingNamespaceSetOf(ND))
-          IsInStd = true;
-      }
-
-      if (IsInStd && llvm::StringSwitch<bool>(R->getName())
-              .Cases("basic_string", "deque", "forward_list", true)
-              .Cases("list", "map", "multimap", "multiset", true)
-              .Cases("priority_queue", "queue", "set", "stack", true)
-              .Cases("unordered_map", "unordered_set", "vector", true)
-              .Default(false)) {
-        InitSeq.InitializeFrom(
-            SemaRef, Entity,
-            InitializationKind::CreateValue(Loc, Loc, Loc, true),
-            MultiExprArg(), /*TopLevelOfInitList=*/false,
-            TreatUnavailableAsInvalid);
-        // Emit a warning for this.  System header warnings aren't shown
-        // by default, but people working on system headers should see it.
-        if (!VerifyOnly) {
-          SemaRef.Diag(CtorDecl->getLocation(),
-                       diag::warn_invalid_initializer_from_system_header);
-          if (Entity.getKind() == InitializedEntity::EK_Member)
-            SemaRef.Diag(Entity.getDecl()->getLocation(),
-                         diag::note_used_in_initialization_here);
-          else if (Entity.getKind() == InitializedEntity::EK_ArrayElement)
-            SemaRef.Diag(Loc, diag::note_used_in_initialization_here);
-        }
-      }
-    }
-  }
-  if (!InitSeq) {
-    if (!VerifyOnly) {
-      InitSeq.Diagnose(SemaRef, Entity, Kind, SubInit);
-      if (Entity.getKind() == InitializedEntity::EK_Member)
-        SemaRef.Diag(Entity.getDecl()->getLocation(),
-                     diag::note_in_omitted_aggregate_initializer)
-          << /*field*/1 << Entity.getDecl();
-      else if (Entity.getKind() == InitializedEntity::EK_ArrayElement) {
-        bool IsTrailingArrayNewMember =
-            Entity.getParent() &&
-            Entity.getParent()->isVariableLengthArrayNew();
-        SemaRef.Diag(Loc, diag::note_in_omitted_aggregate_initializer)
-          << (IsTrailingArrayNewMember ? 2 : /*array element*/0)
-          << Entity.getElementIndex();
-      }
-    }
-    return ExprError();
-  }
-
-  return VerifyOnly ? ExprResult(static_cast<Expr *>(nullptr))
-                    : InitSeq.Perform(SemaRef, Entity, Kind, SubInit);
-}
-
-void InitListChecker::CheckEmptyInitializable(const InitializedEntity &Entity,
-                                              SourceLocation Loc) {
-  assert(VerifyOnly &&
-         "CheckEmptyInitializable is only inteded for verification mode.");
-  if (PerformEmptyInit(SemaRef, Loc, Entity, /*VerifyOnly*/true,
-                       TreatUnavailableAsInvalid).isInvalid())
-    hadError = true;
-}
-
-void InitListChecker::FillInEmptyInitForBase(
-    unsigned Init, const CXXBaseSpecifier &Base,
-    const InitializedEntity &ParentEntity, InitListExpr *ILE,
-    bool &RequiresSecondPass, bool FillWithNoInit) {
-  assert(Init < ILE->getNumInits() && "should have been expanded");
-
-  InitializedEntity BaseEntity = InitializedEntity::InitializeBase(
-      SemaRef.Context, &Base, false, &ParentEntity);
-
-  if (!ILE->getInit(Init)) {
-    ExprResult BaseInit =
-        FillWithNoInit
-            ? new (SemaRef.Context) NoInitExpr(Base.getType())
-            : PerformEmptyInit(SemaRef, ILE->getEndLoc(), BaseEntity,
-                               /*VerifyOnly*/ false, TreatUnavailableAsInvalid);
-    if (BaseInit.isInvalid()) {
-      hadError = true;
-      return;
-    }
-
-    ILE->setInit(Init, BaseInit.getAs<Expr>());
-  } else if (InitListExpr *InnerILE =
-                 dyn_cast<InitListExpr>(ILE->getInit(Init))) {
-    FillInEmptyInitializations(BaseEntity, InnerILE, RequiresSecondPass,
-                               ILE, Init, FillWithNoInit);
-  } else if (DesignatedInitUpdateExpr *InnerDIUE =
-               dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init))) {
-    FillInEmptyInitializations(BaseEntity, InnerDIUE->getUpdater(),
-                               RequiresSecondPass, ILE, Init,
-                               /*FillWithNoInit =*/true);
-  }
-}
-
-void InitListChecker::FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
-                                        const InitializedEntity &ParentEntity,
-                                              InitListExpr *ILE,
-                                              bool &RequiresSecondPass,
-                                              bool FillWithNoInit) {
-  SourceLocation Loc = ILE->getEndLoc();
-  unsigned NumInits = ILE->getNumInits();
-  InitializedEntity MemberEntity
-    = InitializedEntity::InitializeMember(Field, &ParentEntity);
-
-  if (const RecordType *RType = ILE->getType()->getAs<RecordType>())
-    if (!RType->getDecl()->isUnion())
-      assert(Init < NumInits && "This ILE should have been expanded");
-
-  if (Init >= NumInits || !ILE->getInit(Init)) {
-    if (FillWithNoInit) {
-      Expr *Filler = new (SemaRef.Context) NoInitExpr(Field->getType());
-      if (Init < NumInits)
-        ILE->setInit(Init, Filler);
-      else
-        ILE->updateInit(SemaRef.Context, Init, Filler);
-      return;
-    }
-    // C++1y [dcl.init.aggr]p7:
-    //   If there are fewer initializer-clauses in the list than there are
-    //   members in the aggregate, then each member not explicitly initialized
-    //   shall be initialized from its brace-or-equal-initializer [...]
-    if (Field->hasInClassInitializer()) {
-      ExprResult DIE = SemaRef.BuildCXXDefaultInitExpr(Loc, Field);
-      if (DIE.isInvalid()) {
-        hadError = true;
-        return;
-      }
-      SemaRef.checkInitializerLifetime(MemberEntity, DIE.get());
-      if (Init < NumInits)
-        ILE->setInit(Init, DIE.get());
-      else {
-        ILE->updateInit(SemaRef.Context, Init, DIE.get());
-        RequiresSecondPass = true;
-      }
-      return;
-    }
-
-    if (Field->getType()->isReferenceType()) {
-      // C++ [dcl.init.aggr]p9:
-      //   If an incomplete or empty initializer-list leaves a
-      //   member of reference type uninitialized, the program is
-      //   ill-formed.
-      SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized)
-        << Field->getType()
-        << ILE->getSyntacticForm()->getSourceRange();
-      SemaRef.Diag(Field->getLocation(),
-                   diag::note_uninit_reference_member);
-      hadError = true;
-      return;
-    }
-
-    ExprResult MemberInit = PerformEmptyInit(SemaRef, Loc, MemberEntity,
-                                             /*VerifyOnly*/false,
-                                             TreatUnavailableAsInvalid);
-    if (MemberInit.isInvalid()) {
-      hadError = true;
-      return;
-    }
-
-    if (hadError) {
-      // Do nothing
-    } else if (Init < NumInits) {
-      ILE->setInit(Init, MemberInit.getAs<Expr>());
-    } else if (!isa<ImplicitValueInitExpr>(MemberInit.get())) {
-      // Empty initialization requires a constructor call, so
-      // extend the initializer list to include the constructor
-      // call and make a note that we'll need to take another pass
-      // through the initializer list.
-      ILE->updateInit(SemaRef.Context, Init, MemberInit.getAs<Expr>());
-      RequiresSecondPass = true;
-    }
-  } else if (InitListExpr *InnerILE
-               = dyn_cast<InitListExpr>(ILE->getInit(Init)))
-    FillInEmptyInitializations(MemberEntity, InnerILE,
-                               RequiresSecondPass, ILE, Init, FillWithNoInit);
-  else if (DesignatedInitUpdateExpr *InnerDIUE
-               = dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init)))
-    FillInEmptyInitializations(MemberEntity, InnerDIUE->getUpdater(),
-                               RequiresSecondPass, ILE, Init,
-                               /*FillWithNoInit =*/true);
-}
-
-/// Recursively replaces NULL values within the given initializer list
-/// with expressions that perform value-initialization of the
-/// appropriate type, and finish off the InitListExpr formation.
-void
-InitListChecker::FillInEmptyInitializations(const InitializedEntity &Entity,
-                                            InitListExpr *ILE,
-                                            bool &RequiresSecondPass,
-                                            InitListExpr *OuterILE,
-                                            unsigned OuterIndex,
-                                            bool FillWithNoInit) {
-  assert((ILE->getType() != SemaRef.Context.VoidTy) &&
-         "Should not have void type");
-
-  // If this is a nested initializer list, we might have changed its contents
-  // (and therefore some of its properties, such as instantiation-dependence)
-  // while filling it in. Inform the outer initializer list so that its state
-  // can be updated to match.
-  // FIXME: We should fully build the inner initializers before constructing
-  // the outer InitListExpr instead of mutating AST nodes after they have
-  // been used as subexpressions of other nodes.
-  struct UpdateOuterILEWithUpdatedInit {
-    InitListExpr *Outer;
-    unsigned OuterIndex;
-    ~UpdateOuterILEWithUpdatedInit() {
-      if (Outer)
-        Outer->setInit(OuterIndex, Outer->getInit(OuterIndex));
-    }
-  } UpdateOuterRAII = {OuterILE, OuterIndex};
-
-  // A transparent ILE is not performing aggregate initialization and should
-  // not be filled in.
-  if (ILE->isTransparent())
-    return;
-
-  if (const RecordType *RType = ILE->getType()->getAs<RecordType>()) {
-    const RecordDecl *RDecl = RType->getDecl();
-    if (RDecl->isUnion() && ILE->getInitializedFieldInUnion())
-      FillInEmptyInitForField(0, ILE->getInitializedFieldInUnion(),
-                              Entity, ILE, RequiresSecondPass, FillWithNoInit);
-    else if (RDecl->isUnion() && isa<CXXRecordDecl>(RDecl) &&
-             cast<CXXRecordDecl>(RDecl)->hasInClassInitializer()) {
-      for (auto *Field : RDecl->fields()) {
-        if (Field->hasInClassInitializer()) {
-          FillInEmptyInitForField(0, Field, Entity, ILE, RequiresSecondPass,
-                                  FillWithNoInit);
-          break;
-        }
-      }
-    } else {
-      // The fields beyond ILE->getNumInits() are default initialized, so in
-      // order to leave them uninitialized, the ILE is expanded and the extra
-      // fields are then filled with NoInitExpr.
-      unsigned NumElems = numStructUnionElements(ILE->getType());
-      if (RDecl->hasFlexibleArrayMember())
-        ++NumElems;
-      if (ILE->getNumInits() < NumElems)
-        ILE->resizeInits(SemaRef.Context, NumElems);
-
-      unsigned Init = 0;
-
-      if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RDecl)) {
-        for (auto &Base : CXXRD->bases()) {
-          if (hadError)
-            return;
-
-          FillInEmptyInitForBase(Init, Base, Entity, ILE, RequiresSecondPass,
-                                 FillWithNoInit);
-          ++Init;
-        }
-      }
-
-      for (auto *Field : RDecl->fields()) {
-        if (Field->isUnnamedBitfield())
-          continue;
-
-        if (hadError)
-          return;
-
-        FillInEmptyInitForField(Init, Field, Entity, ILE, RequiresSecondPass,
-                                FillWithNoInit);
-        if (hadError)
-          return;
-
-        ++Init;
-
-        // Only look at the first initialization of a union.
-        if (RDecl->isUnion())
-          break;
-      }
-    }
-
-    return;
-  }
-
-  QualType ElementType;
-
-  InitializedEntity ElementEntity = Entity;
-  unsigned NumInits = ILE->getNumInits();
-  unsigned NumElements = NumInits;
-  if (const ArrayType *AType = SemaRef.Context.getAsArrayType(ILE->getType())) {
-    ElementType = AType->getElementType();
-    if (const auto *CAType = dyn_cast<ConstantArrayType>(AType))
-      NumElements = CAType->getSize().getZExtValue();
-    // For an array new with an unknown bound, ask for one additional element
-    // in order to populate the array filler.
-    if (Entity.isVariableLengthArrayNew())
-      ++NumElements;
-    ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
-                                                         0, Entity);
-  } else if (const VectorType *VType = ILE->getType()->getAs<VectorType>()) {
-    ElementType = VType->getElementType();
-    NumElements = VType->getNumElements();
-    ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
-                                                         0, Entity);
-  } else
-    ElementType = ILE->getType();
-
-  for (unsigned Init = 0; Init != NumElements; ++Init) {
-    if (hadError)
-      return;
-
-    if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement ||
-        ElementEntity.getKind() == InitializedEntity::EK_VectorElement)
-      ElementEntity.setElementIndex(Init);
-
-    if (Init >= NumInits && ILE->hasArrayFiller())
-      return;
-
-    Expr *InitExpr = (Init < NumInits ? ILE->getInit(Init) : nullptr);
-    if (!InitExpr && Init < NumInits && ILE->hasArrayFiller())
-      ILE->setInit(Init, ILE->getArrayFiller());
-    else if (!InitExpr && !ILE->hasArrayFiller()) {
-      Expr *Filler = nullptr;
-
-      if (FillWithNoInit)
-        Filler = new (SemaRef.Context) NoInitExpr(ElementType);
-      else {
-        ExprResult ElementInit =
-            PerformEmptyInit(SemaRef, ILE->getEndLoc(), ElementEntity,
-                             /*VerifyOnly*/ false, TreatUnavailableAsInvalid);
-        if (ElementInit.isInvalid()) {
-          hadError = true;
-          return;
-        }
-
-        Filler = ElementInit.getAs<Expr>();
-      }
-
-      if (hadError) {
-        // Do nothing
-      } else if (Init < NumInits) {
-        // For arrays, just set the expression used for value-initialization
-        // of the "holes" in the array.
-        if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement)
-          ILE->setArrayFiller(Filler);
-        else
-          ILE->setInit(Init, Filler);
-      } else {
-        // For arrays, just set the expression used for value-initialization
-        // of the rest of elements and exit.
-        if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement) {
-          ILE->setArrayFiller(Filler);
-          return;
-        }
-
-        if (!isa<ImplicitValueInitExpr>(Filler) && !isa<NoInitExpr>(Filler)) {
-          // Empty initialization requires a constructor call, so
-          // extend the initializer list to include the constructor
-          // call and make a note that we'll need to take another pass
-          // through the initializer list.
-          ILE->updateInit(SemaRef.Context, Init, Filler);
-          RequiresSecondPass = true;
-        }
-      }
-    } else if (InitListExpr *InnerILE
-                 = dyn_cast_or_null<InitListExpr>(InitExpr))
-      FillInEmptyInitializations(ElementEntity, InnerILE, RequiresSecondPass,
-                                 ILE, Init, FillWithNoInit);
-    else if (DesignatedInitUpdateExpr *InnerDIUE
-                 = dyn_cast_or_null<DesignatedInitUpdateExpr>(InitExpr))
-      FillInEmptyInitializations(ElementEntity, InnerDIUE->getUpdater(),
-                                 RequiresSecondPass, ILE, Init,
-                                 /*FillWithNoInit =*/true);
-  }
-}
-
-InitListChecker::InitListChecker(Sema &S, const InitializedEntity &Entity,
-                                 InitListExpr *IL, QualType &T,
-                                 bool VerifyOnly,
-                                 bool TreatUnavailableAsInvalid)
-  : SemaRef(S), VerifyOnly(VerifyOnly),
-    TreatUnavailableAsInvalid(TreatUnavailableAsInvalid) {
-  // FIXME: Check that IL isn't already the semantic form of some other
-  // InitListExpr. If it is, we'd create a broken AST.
-
-  hadError = false;
-
-  FullyStructuredList =
-      getStructuredSubobjectInit(IL, 0, T, nullptr, 0, IL->getSourceRange());
-  CheckExplicitInitList(Entity, IL, T, FullyStructuredList,
-                        /*TopLevelObject=*/true);
-
-  if (!hadError && !VerifyOnly) {
-    bool RequiresSecondPass = false;
-    FillInEmptyInitializations(Entity, FullyStructuredList, RequiresSecondPass,
-                               /*OuterILE=*/nullptr, /*OuterIndex=*/0);
-    if (RequiresSecondPass && !hadError)
-      FillInEmptyInitializations(Entity, FullyStructuredList,
-                                 RequiresSecondPass, nullptr, 0);
-  }
-}
-
-int InitListChecker::numArrayElements(QualType DeclType) {
-  // FIXME: use a proper constant
-  int maxElements = 0x7FFFFFFF;
-  if (const ConstantArrayType *CAT =
-        SemaRef.Context.getAsConstantArrayType(DeclType)) {
-    maxElements = static_cast<int>(CAT->getSize().getZExtValue());
-  }
-  return maxElements;
-}
-
-int InitListChecker::numStructUnionElements(QualType DeclType) {
-  RecordDecl *structDecl = DeclType->getAs<RecordType>()->getDecl();
-  int InitializableMembers = 0;
-  if (auto *CXXRD = dyn_cast<CXXRecordDecl>(structDecl))
-    InitializableMembers += CXXRD->getNumBases();
-  for (const auto *Field : structDecl->fields())
-    if (!Field->isUnnamedBitfield())
-      ++InitializableMembers;
-
-  if (structDecl->isUnion())
-    return std::min(InitializableMembers, 1);
-  return InitializableMembers - structDecl->hasFlexibleArrayMember();
-}
-
-/// Determine whether Entity is an entity for which it is idiomatic to elide
-/// the braces in aggregate initialization.
-static bool isIdiomaticBraceElisionEntity(const InitializedEntity &Entity) {
-  // Recursive initialization of the one and only field within an aggregate
-  // class is considered idiomatic. This case arises in particular for
-  // initialization of std::array, where the C++ standard suggests the idiom of
-  //
-  //   std::array<T, N> arr = {1, 2, 3};
-  //
-  // (where std::array is an aggregate struct containing a single array field.
-
-  // FIXME: Should aggregate initialization of a struct with a single
-  // base class and no members also suppress the warning?
-  if (Entity.getKind() != InitializedEntity::EK_Member || !Entity.getParent())
-    return false;
-
-  auto *ParentRD =
-      Entity.getParent()->getType()->castAs<RecordType>()->getDecl();
-  if (CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(ParentRD))
-    if (CXXRD->getNumBases())
-      return false;
-
-  auto FieldIt = ParentRD->field_begin();
-  assert(FieldIt != ParentRD->field_end() &&
-         "no fields but have initializer for member?");
-  return ++FieldIt == ParentRD->field_end();
-}
-
-/// Check whether the range of the initializer \p ParentIList from element
-/// \p Index onwards can be used to initialize an object of type \p T. Update
-/// \p Index to indicate how many elements of the list were consumed.
-///
-/// This also fills in \p StructuredList, from element \p StructuredIndex
-/// onwards, with the fully-braced, desugared form of the initialization.
-void InitListChecker::CheckImplicitInitList(const InitializedEntity &Entity,
-                                            InitListExpr *ParentIList,
-                                            QualType T, unsigned &Index,
-                                            InitListExpr *StructuredList,
-                                            unsigned &StructuredIndex) {
-  int maxElements = 0;
-
-  if (T->isArrayType())
-    maxElements = numArrayElements(T);
-  else if (T->isRecordType())
-    maxElements = numStructUnionElements(T);
-  else if (T->isVectorType())
-    maxElements = T->getAs<VectorType>()->getNumElements();
-  else
-    llvm_unreachable("CheckImplicitInitList(): Illegal type");
-
-  if (maxElements == 0) {
-    if (!VerifyOnly)
-      SemaRef.Diag(ParentIList->getInit(Index)->getBeginLoc(),
-                   diag::err_implicit_empty_initializer);
-    ++Index;
-    hadError = true;
-    return;
-  }
-
-  // Build a structured initializer list corresponding to this subobject.
-  InitListExpr *StructuredSubobjectInitList = getStructuredSubobjectInit(
-      ParentIList, Index, T, StructuredList, StructuredIndex,
-      SourceRange(ParentIList->getInit(Index)->getBeginLoc(),
-                  ParentIList->getSourceRange().getEnd()));
-  unsigned StructuredSubobjectInitIndex = 0;
-
-  // Check the element types and build the structural subobject.
-  unsigned StartIndex = Index;
-  CheckListElementTypes(Entity, ParentIList, T,
-                        /*SubobjectIsDesignatorContext=*/false, Index,
-                        StructuredSubobjectInitList,
-                        StructuredSubobjectInitIndex);
-
-  if (!VerifyOnly) {
-    StructuredSubobjectInitList->setType(T);
-
-    unsigned EndIndex = (Index == StartIndex? StartIndex : Index - 1);
-    // Update the structured sub-object initializer so that it's ending
-    // range corresponds with the end of the last initializer it used.
-    if (EndIndex < ParentIList->getNumInits() &&
-        ParentIList->getInit(EndIndex)) {
-      SourceLocation EndLoc
-        = ParentIList->getInit(EndIndex)->getSourceRange().getEnd();
-      StructuredSubobjectInitList->setRBraceLoc(EndLoc);
-    }
-
-    // Complain about missing braces.
-    if ((T->isArrayType() || T->isRecordType()) &&
-        !ParentIList->isIdiomaticZeroInitializer(SemaRef.getLangOpts()) &&
-        !isIdiomaticBraceElisionEntity(Entity)) {
-      SemaRef.Diag(StructuredSubobjectInitList->getBeginLoc(),
-                   diag::warn_missing_braces)
-          << StructuredSubobjectInitList->getSourceRange()
-          << FixItHint::CreateInsertion(
-                 StructuredSubobjectInitList->getBeginLoc(), "{")
-          << FixItHint::CreateInsertion(
-                 SemaRef.getLocForEndOfToken(
-                     StructuredSubobjectInitList->getEndLoc()),
-                 "}");
-    }
-
-    // Warn if this type won't be an aggregate in future versions of C++.
-    auto *CXXRD = T->getAsCXXRecordDecl();
-    if (CXXRD && CXXRD->hasUserDeclaredConstructor()) {
-      SemaRef.Diag(StructuredSubobjectInitList->getBeginLoc(),
-                   diag::warn_cxx2a_compat_aggregate_init_with_ctors)
-          << StructuredSubobjectInitList->getSourceRange() << T;
-    }
-  }
-}
-
-/// Warn that \p Entity was of scalar type and was initialized by a
-/// single-element braced initializer list.
-static void warnBracedScalarInit(Sema &S, const InitializedEntity &Entity,
-                                 SourceRange Braces) {
-  // Don't warn during template instantiation. If the initialization was
-  // non-dependent, we warned during the initial parse; otherwise, the
-  // type might not be scalar in some uses of the template.
-  if (S.inTemplateInstantiation())
-    return;
-
-  unsigned DiagID = 0;
-
-  switch (Entity.getKind()) {
-  case InitializedEntity::EK_VectorElement:
-  case InitializedEntity::EK_ComplexElement:
-  case InitializedEntity::EK_ArrayElement:
-  case InitializedEntity::EK_Parameter:
-  case InitializedEntity::EK_Parameter_CF_Audited:
-  case InitializedEntity::EK_Result:
-    // Extra braces here are suspicious.
-    DiagID = diag::warn_braces_around_scalar_init;
-    break;
-
-  case InitializedEntity::EK_Member:
-    // Warn on aggregate initialization but not on ctor init list or
-    // default member initializer.
-    if (Entity.getParent())
-      DiagID = diag::warn_braces_around_scalar_init;
-    break;
-
-  case InitializedEntity::EK_Variable:
-  case InitializedEntity::EK_LambdaCapture:
-    // No warning, might be direct-list-initialization.
-    // FIXME: Should we warn for copy-list-initialization in these cases?
-    break;
-
-  case InitializedEntity::EK_New:
-  case InitializedEntity::EK_Temporary:
-  case InitializedEntity::EK_CompoundLiteralInit:
-    // No warning, braces are part of the syntax of the underlying construct.
-    break;
-
-  case InitializedEntity::EK_RelatedResult:
-    // No warning, we already warned when initializing the result.
-    break;
-
-  case InitializedEntity::EK_Exception:
-  case InitializedEntity::EK_Base:
-  case InitializedEntity::EK_Delegating:
-  case InitializedEntity::EK_BlockElement:
-  case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
-  case InitializedEntity::EK_Binding:
-  case InitializedEntity::EK_StmtExprResult:
-    llvm_unreachable("unexpected braced scalar init");
-  }
-
-  if (DiagID) {
-    S.Diag(Braces.getBegin(), DiagID)
-      << Braces
-      << FixItHint::CreateRemoval(Braces.getBegin())
-      << FixItHint::CreateRemoval(Braces.getEnd());
-  }
-}
-
-/// Check whether the initializer \p IList (that was written with explicit
-/// braces) can be used to initialize an object of type \p T.
-///
-/// This also fills in \p StructuredList with the fully-braced, desugared
-/// form of the initialization.
-void InitListChecker::CheckExplicitInitList(const InitializedEntity &Entity,
-                                            InitListExpr *IList, QualType &T,
-                                            InitListExpr *StructuredList,
-                                            bool TopLevelObject) {
-  if (!VerifyOnly) {
-    SyntacticToSemantic[IList] = StructuredList;
-    StructuredList->setSyntacticForm(IList);
-  }
-
-  unsigned Index = 0, StructuredIndex = 0;
-  CheckListElementTypes(Entity, IList, T, /*SubobjectIsDesignatorContext=*/true,
-                        Index, StructuredList, StructuredIndex, TopLevelObject);
-  if (!VerifyOnly) {
-    QualType ExprTy = T;
-    if (!ExprTy->isArrayType())
-      ExprTy = ExprTy.getNonLValueExprType(SemaRef.Context);
-    IList->setType(ExprTy);
-    StructuredList->setType(ExprTy);
-  }
-  if (hadError)
-    return;
-
-  if (Index < IList->getNumInits()) {
-    // We have leftover initializers
-    if (VerifyOnly) {
-      if (SemaRef.getLangOpts().CPlusPlus ||
-          (SemaRef.getLangOpts().OpenCL &&
-           IList->getType()->isVectorType())) {
-        hadError = true;
-      }
-      return;
-    }
-
-    if (StructuredIndex == 1 &&
-        IsStringInit(StructuredList->getInit(0), T, SemaRef.Context) ==
-            SIF_None) {
-      unsigned DK = diag::ext_excess_initializers_in_char_array_initializer;
-      if (SemaRef.getLangOpts().CPlusPlus) {
-        DK = diag::err_excess_initializers_in_char_array_initializer;
-        hadError = true;
-      }
-      // Special-case
-      SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
-          << IList->getInit(Index)->getSourceRange();
-    } else if (!T->isIncompleteType()) {
-      // Don't complain for incomplete types, since we'll get an error
-      // elsewhere
-      QualType CurrentObjectType = StructuredList->getType();
-      int initKind =
-        CurrentObjectType->isArrayType()? 0 :
-        CurrentObjectType->isVectorType()? 1 :
-        CurrentObjectType->isScalarType()? 2 :
-        CurrentObjectType->isUnionType()? 3 :
-        4;
-
-      unsigned DK = diag::ext_excess_initializers;
-      if (SemaRef.getLangOpts().CPlusPlus) {
-        DK = diag::err_excess_initializers;
-        hadError = true;
-      }
-      if (SemaRef.getLangOpts().OpenCL && initKind == 1) {
-        DK = diag::err_excess_initializers;
-        hadError = true;
-      }
-
-      SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
-          << initKind << IList->getInit(Index)->getSourceRange();
-    }
-  }
-
-  if (!VerifyOnly) {
-    if (T->isScalarType() && IList->getNumInits() == 1 &&
-        !isa<InitListExpr>(IList->getInit(0)))
-      warnBracedScalarInit(SemaRef, Entity, IList->getSourceRange());
-
-    // Warn if this is a class type that won't be an aggregate in future
-    // versions of C++.
-    auto *CXXRD = T->getAsCXXRecordDecl();
-    if (CXXRD && CXXRD->hasUserDeclaredConstructor()) {
-      // Don't warn if there's an equivalent default constructor that would be
-      // used instead.
-      bool HasEquivCtor = false;
-      if (IList->getNumInits() == 0) {
-        auto *CD = SemaRef.LookupDefaultConstructor(CXXRD);
-        HasEquivCtor = CD && !CD->isDeleted();
-      }
-
-      if (!HasEquivCtor) {
-        SemaRef.Diag(IList->getBeginLoc(),
-                     diag::warn_cxx2a_compat_aggregate_init_with_ctors)
-            << IList->getSourceRange() << T;
-      }
-    }
-  }
-}
-
-void InitListChecker::CheckListElementTypes(const InitializedEntity &Entity,
-                                            InitListExpr *IList,
-                                            QualType &DeclType,
-                                            bool SubobjectIsDesignatorContext,
-                                            unsigned &Index,
-                                            InitListExpr *StructuredList,
-                                            unsigned &StructuredIndex,
-                                            bool TopLevelObject) {
-  if (DeclType->isAnyComplexType() && SubobjectIsDesignatorContext) {
-    // Explicitly braced initializer for complex type can be real+imaginary
-    // parts.
-    CheckComplexType(Entity, IList, DeclType, Index,
-                     StructuredList, StructuredIndex);
-  } else if (DeclType->isScalarType()) {
-    CheckScalarType(Entity, IList, DeclType, Index,
-                    StructuredList, StructuredIndex);
-  } else if (DeclType->isVectorType()) {
-    CheckVectorType(Entity, IList, DeclType, Index,
-                    StructuredList, StructuredIndex);
-  } else if (DeclType->isRecordType()) {
-    assert(DeclType->isAggregateType() &&
-           "non-aggregate records should be handed in CheckSubElementType");
-    RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl();
-    auto Bases =
-        CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(),
-                                        CXXRecordDecl::base_class_iterator());
-    if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
-      Bases = CXXRD->bases();
-    CheckStructUnionTypes(Entity, IList, DeclType, Bases, RD->field_begin(),
-                          SubobjectIsDesignatorContext, Index, StructuredList,
-                          StructuredIndex, TopLevelObject);
-  } else if (DeclType->isArrayType()) {
-    llvm::APSInt Zero(
-                    SemaRef.Context.getTypeSize(SemaRef.Context.getSizeType()),
-                    false);
-    CheckArrayType(Entity, IList, DeclType, Zero,
-                   SubobjectIsDesignatorContext, Index,
-                   StructuredList, StructuredIndex);
-  } else if (DeclType->isVoidType() || DeclType->isFunctionType()) {
-    // This type is invalid, issue a diagnostic.
-    ++Index;
-    if (!VerifyOnly)
-      SemaRef.Diag(IList->getBeginLoc(), diag::err_illegal_initializer_type)
-          << DeclType;
-    hadError = true;
-  } else if (DeclType->isReferenceType()) {
-    CheckReferenceType(Entity, IList, DeclType, Index,
-                       StructuredList, StructuredIndex);
-  } else if (DeclType->isObjCObjectType()) {
-    if (!VerifyOnly)
-      SemaRef.Diag(IList->getBeginLoc(), diag::err_init_objc_class) << DeclType;
-    hadError = true;
-  } else if (DeclType->isOCLIntelSubgroupAVCType()) {
-    // Checks for scalar type are sufficient for these types too.
-    CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
-                    StructuredIndex);
-  } else {
-    if (!VerifyOnly)
-      SemaRef.Diag(IList->getBeginLoc(), diag::err_illegal_initializer_type)
-          << DeclType;
-    hadError = true;
-  }
-}
-
-void InitListChecker::CheckSubElementType(const InitializedEntity &Entity,
-                                          InitListExpr *IList,
-                                          QualType ElemType,
-                                          unsigned &Index,
-                                          InitListExpr *StructuredList,
-                                          unsigned &StructuredIndex) {
-  Expr *expr = IList->getInit(Index);
-
-  if (ElemType->isReferenceType())
-    return CheckReferenceType(Entity, IList, ElemType, Index,
-                              StructuredList, StructuredIndex);
-
-  if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) {
-    if (SubInitList->getNumInits() == 1 &&
-        IsStringInit(SubInitList->getInit(0), ElemType, SemaRef.Context) ==
-        SIF_None) {
-      expr = SubInitList->getInit(0);
-    } else if (!SemaRef.getLangOpts().CPlusPlus) {
-      InitListExpr *InnerStructuredList
-        = getStructuredSubobjectInit(IList, Index, ElemType,
-                                     StructuredList, StructuredIndex,
-                                     SubInitList->getSourceRange(), true);
-      CheckExplicitInitList(Entity, SubInitList, ElemType,
-                            InnerStructuredList);
-
-      if (!hadError && !VerifyOnly) {
-        bool RequiresSecondPass = false;
-        FillInEmptyInitializations(Entity, InnerStructuredList,
-                                   RequiresSecondPass, StructuredList,
-                                   StructuredIndex);
-        if (RequiresSecondPass && !hadError)
-          FillInEmptyInitializations(Entity, InnerStructuredList,
-                                     RequiresSecondPass, StructuredList,
-                                     StructuredIndex);
-      }
-      ++StructuredIndex;
-      ++Index;
-      return;
-    }
-    // C++ initialization is handled later.
-  } else if (isa<ImplicitValueInitExpr>(expr)) {
-    // This happens during template instantiation when we see an InitListExpr
-    // that we've already checked once.
-    assert(SemaRef.Context.hasSameType(expr->getType(), ElemType) &&
-           "found implicit initialization for the wrong type");
-    if (!VerifyOnly)
-      UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
-    ++Index;
-    return;
-  }
-
-  if (SemaRef.getLangOpts().CPlusPlus) {
-    // C++ [dcl.init.aggr]p2:
-    //   Each member is copy-initialized from the corresponding
-    //   initializer-clause.
-
-    // FIXME: Better EqualLoc?
-    InitializationKind Kind =
-        InitializationKind::CreateCopy(expr->getBeginLoc(), SourceLocation());
-    InitializationSequence Seq(SemaRef, Entity, Kind, expr,
-                               /*TopLevelOfInitList*/ true);
-
-    // C++14 [dcl.init.aggr]p13:
-    //   If the assignment-expression can initialize a member, the member is
-    //   initialized. Otherwise [...] brace elision is assumed
-    //
-    // Brace elision is never performed if the element is not an
-    // assignment-expression.
-    if (Seq || isa<InitListExpr>(expr)) {
-      if (!VerifyOnly) {
-        ExprResult Result =
-          Seq.Perform(SemaRef, Entity, Kind, expr);
-        if (Result.isInvalid())
-          hadError = true;
-
-        UpdateStructuredListElement(StructuredList, StructuredIndex,
-                                    Result.getAs<Expr>());
-      } else if (!Seq)
-        hadError = true;
-      ++Index;
-      return;
-    }
-
-    // Fall through for subaggregate initialization
-  } else if (ElemType->isScalarType() || ElemType->isAtomicType()) {
-    // FIXME: Need to handle atomic aggregate types with implicit init lists.
-    return CheckScalarType(Entity, IList, ElemType, Index,
-                           StructuredList, StructuredIndex);
-  } else if (const ArrayType *arrayType =
-                 SemaRef.Context.getAsArrayType(ElemType)) {
-    // arrayType can be incomplete if we're initializing a flexible
-    // array member.  There's nothing we can do with the completed
-    // type here, though.
-
-    if (IsStringInit(expr, arrayType, SemaRef.Context) == SIF_None) {
-      if (!VerifyOnly) {
-        CheckStringInit(expr, ElemType, arrayType, SemaRef);
-        UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
-      }
-      ++Index;
-      return;
-    }
-
-    // Fall through for subaggregate initialization.
-
-  } else {
-    assert((ElemType->isRecordType() || ElemType->isVectorType() ||
-            ElemType->isOpenCLSpecificType()) && "Unexpected type");
-
-    // C99 6.7.8p13:
-    //
-    //   The initializer for a structure or union object that has
-    //   automatic storage duration shall be either an initializer
-    //   list as described below, or a single expression that has
-    //   compatible structure or union type. In the latter case, the
-    //   initial value of the object, including unnamed members, is
-    //   that of the expression.
-    ExprResult ExprRes = expr;
-    if (SemaRef.CheckSingleAssignmentConstraints(
-            ElemType, ExprRes, !VerifyOnly) != Sema::Incompatible) {
-      if (ExprRes.isInvalid())
-        hadError = true;
-      else {
-        ExprRes = SemaRef.DefaultFunctionArrayLvalueConversion(ExprRes.get());
-          if (ExprRes.isInvalid())
-            hadError = true;
-      }
-      UpdateStructuredListElement(StructuredList, StructuredIndex,
-                                  ExprRes.getAs<Expr>());
-      ++Index;
-      return;
-    }
-    ExprRes.get();
-    // Fall through for subaggregate initialization
-  }
-
-  // C++ [dcl.init.aggr]p12:
-  //
-  //   [...] Otherwise, if the member is itself a non-empty
-  //   subaggregate, brace elision is assumed and the initializer is
-  //   considered for the initialization of the first member of
-  //   the subaggregate.
-  // OpenCL vector initializer is handled elsewhere.
-  if ((!SemaRef.getLangOpts().OpenCL && ElemType->isVectorType()) ||
-      ElemType->isAggregateType()) {
-    CheckImplicitInitList(Entity, IList, ElemType, Index, StructuredList,
-                          StructuredIndex);
-    ++StructuredIndex;
-  } else {
-    if (!VerifyOnly) {
-      // We cannot initialize this element, so let
-      // PerformCopyInitialization produce the appropriate diagnostic.
-      SemaRef.PerformCopyInitialization(Entity, SourceLocation(), expr,
-                                        /*TopLevelOfInitList=*/true);
-    }
-    hadError = true;
-    ++Index;
-    ++StructuredIndex;
-  }
-}
-
-void InitListChecker::CheckComplexType(const InitializedEntity &Entity,
-                                       InitListExpr *IList, QualType DeclType,
-                                       unsigned &Index,
-                                       InitListExpr *StructuredList,
-                                       unsigned &StructuredIndex) {
-  assert(Index == 0 && "Index in explicit init list must be zero");
-
-  // As an extension, clang supports complex initializers, which initialize
-  // a complex number component-wise.  When an explicit initializer list for
-  // a complex number contains two two initializers, this extension kicks in:
-  // it exepcts the initializer list to contain two elements convertible to
-  // the element type of the complex type. The first element initializes
-  // the real part, and the second element intitializes the imaginary part.
-
-  if (IList->getNumInits() != 2)
-    return CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
-                           StructuredIndex);
-
-  // This is an extension in C.  (The builtin _Complex type does not exist
-  // in the C++ standard.)
-  if (!SemaRef.getLangOpts().CPlusPlus && !VerifyOnly)
-    SemaRef.Diag(IList->getBeginLoc(), diag::ext_complex_component_init)
-        << IList->getSourceRange();
-
-  // Initialize the complex number.
-  QualType elementType = DeclType->getAs<ComplexType>()->getElementType();
-  InitializedEntity ElementEntity =
-    InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
-
-  for (unsigned i = 0; i < 2; ++i) {
-    ElementEntity.setElementIndex(Index);
-    CheckSubElementType(ElementEntity, IList, elementType, Index,
-                        StructuredList, StructuredIndex);
-  }
-}
-
-void InitListChecker::CheckScalarType(const InitializedEntity &Entity,
-                                      InitListExpr *IList, QualType DeclType,
-                                      unsigned &Index,
-                                      InitListExpr *StructuredList,
-                                      unsigned &StructuredIndex) {
-  if (Index >= IList->getNumInits()) {
-    if (!VerifyOnly)
-      SemaRef.Diag(IList->getBeginLoc(),
-                   SemaRef.getLangOpts().CPlusPlus11
-                       ? diag::warn_cxx98_compat_empty_scalar_initializer
-                       : diag::err_empty_scalar_initializer)
-          << IList->getSourceRange();
-    hadError = !SemaRef.getLangOpts().CPlusPlus11;
-    ++Index;
-    ++StructuredIndex;
-    return;
-  }
-
-  Expr *expr = IList->getInit(Index);
-  if (InitListExpr *SubIList = dyn_cast<InitListExpr>(expr)) {
-    // FIXME: This is invalid, and accepting it causes overload resolution
-    // to pick the wrong overload in some corner cases.
-    if (!VerifyOnly)
-      SemaRef.Diag(SubIList->getBeginLoc(),
-                   diag::ext_many_braces_around_scalar_init)
-          << SubIList->getSourceRange();
-
-    CheckScalarType(Entity, SubIList, DeclType, Index, StructuredList,
-                    StructuredIndex);
-    return;
-  } else if (isa<DesignatedInitExpr>(expr)) {
-    if (!VerifyOnly)
-      SemaRef.Diag(expr->getBeginLoc(), diag::err_designator_for_scalar_init)
-          << DeclType << expr->getSourceRange();
-    hadError = true;
-    ++Index;
-    ++StructuredIndex;
-    return;
-  }
-
-  if (VerifyOnly) {
-    if (!SemaRef.CanPerformCopyInitialization(Entity,expr))
-      hadError = true;
-    ++Index;
-    return;
-  }
-
-  ExprResult Result =
-      SemaRef.PerformCopyInitialization(Entity, expr->getBeginLoc(), expr,
-                                        /*TopLevelOfInitList=*/true);
-
-  Expr *ResultExpr = nullptr;
-
-  if (Result.isInvalid())
-    hadError = true; // types weren't compatible.
-  else {
-    ResultExpr = Result.getAs<Expr>();
-
-    if (ResultExpr != expr) {
-      // The type was promoted, update initializer list.
-      IList->setInit(Index, ResultExpr);
-    }
-  }
-  if (hadError)
-    ++StructuredIndex;
-  else
-    UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr);
-  ++Index;
-}
-
-void InitListChecker::CheckReferenceType(const InitializedEntity &Entity,
-                                         InitListExpr *IList, QualType DeclType,
-                                         unsigned &Index,
-                                         InitListExpr *StructuredList,
-                                         unsigned &StructuredIndex) {
-  if (Index >= IList->getNumInits()) {
-    // FIXME: It would be wonderful if we could point at the actual member. In
-    // general, it would be useful to pass location information down the stack,
-    // so that we know the location (or decl) of the "current object" being
-    // initialized.
-    if (!VerifyOnly)
-      SemaRef.Diag(IList->getBeginLoc(),
-                   diag::err_init_reference_member_uninitialized)
-          << DeclType << IList->getSourceRange();
-    hadError = true;
-    ++Index;
-    ++StructuredIndex;
-    return;
-  }
-
-  Expr *expr = IList->getInit(Index);
-  if (isa<InitListExpr>(expr) && !SemaRef.getLangOpts().CPlusPlus11) {
-    if (!VerifyOnly)
-      SemaRef.Diag(IList->getBeginLoc(), diag::err_init_non_aggr_init_list)
-          << DeclType << IList->getSourceRange();
-    hadError = true;
-    ++Index;
-    ++StructuredIndex;
-    return;
-  }
-
-  if (VerifyOnly) {
-    if (!SemaRef.CanPerformCopyInitialization(Entity,expr))
-      hadError = true;
-    ++Index;
-    return;
-  }
-
-  ExprResult Result =
-      SemaRef.PerformCopyInitialization(Entity, expr->getBeginLoc(), expr,
-                                        /*TopLevelOfInitList=*/true);
-
-  if (Result.isInvalid())
-    hadError = true;
-
-  expr = Result.getAs<Expr>();
-  IList->setInit(Index, expr);
-
-  if (hadError)
-    ++StructuredIndex;
-  else
-    UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
-  ++Index;
-}
-
-void InitListChecker::CheckVectorType(const InitializedEntity &Entity,
-                                      InitListExpr *IList, QualType DeclType,
-                                      unsigned &Index,
-                                      InitListExpr *StructuredList,
-                                      unsigned &StructuredIndex) {
-  const VectorType *VT = DeclType->getAs<VectorType>();
-  unsigned maxElements = VT->getNumElements();
-  unsigned numEltsInit = 0;
-  QualType elementType = VT->getElementType();
-
-  if (Index >= IList->getNumInits()) {
-    // Make sure the element type can be value-initialized.
-    if (VerifyOnly)
-      CheckEmptyInitializable(
-          InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
-          IList->getEndLoc());
-    return;
-  }
-
-  if (!SemaRef.getLangOpts().OpenCL) {
-    // If the initializing element is a vector, try to copy-initialize
-    // instead of breaking it apart (which is doomed to failure anyway).
-    Expr *Init = IList->getInit(Index);
-    if (!isa<InitListExpr>(Init) && Init->getType()->isVectorType()) {
-      if (VerifyOnly) {
-        if (!SemaRef.CanPerformCopyInitialization(Entity, Init))
-          hadError = true;
-        ++Index;
-        return;
-      }
-
-      ExprResult Result =
-          SemaRef.PerformCopyInitialization(Entity, Init->getBeginLoc(), Init,
-                                            /*TopLevelOfInitList=*/true);
-
-      Expr *ResultExpr = nullptr;
-      if (Result.isInvalid())
-        hadError = true; // types weren't compatible.
-      else {
-        ResultExpr = Result.getAs<Expr>();
-
-        if (ResultExpr != Init) {
-          // The type was promoted, update initializer list.
-          IList->setInit(Index, ResultExpr);
-        }
-      }
-      if (hadError)
-        ++StructuredIndex;
-      else
-        UpdateStructuredListElement(StructuredList, StructuredIndex,
-                                    ResultExpr);
-      ++Index;
-      return;
-    }
-
-    InitializedEntity ElementEntity =
-      InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
-
-    for (unsigned i = 0; i < maxElements; ++i, ++numEltsInit) {
-      // Don't attempt to go past the end of the init list
-      if (Index >= IList->getNumInits()) {
-        if (VerifyOnly)
-          CheckEmptyInitializable(ElementEntity, IList->getEndLoc());
-        break;
-      }
-
-      ElementEntity.setElementIndex(Index);
-      CheckSubElementType(ElementEntity, IList, elementType, Index,
-                          StructuredList, StructuredIndex);
-    }
-
-    if (VerifyOnly)
-      return;
-
-    bool isBigEndian = SemaRef.Context.getTargetInfo().isBigEndian();
-    const VectorType *T = Entity.getType()->getAs<VectorType>();
-    if (isBigEndian && (T->getVectorKind() == VectorType::NeonVector ||
-                        T->getVectorKind() == VectorType::NeonPolyVector)) {
-      // The ability to use vector initializer lists is a GNU vector extension
-      // and is unrelated to the NEON intrinsics in arm_neon.h. On little
-      // endian machines it works fine, however on big endian machines it
-      // exhibits surprising behaviour:
-      //
-      //   uint32x2_t x = {42, 64};
-      //   return vget_lane_u32(x, 0); // Will return 64.
-      //
-      // Because of this, explicitly call out that it is non-portable.
-      //
-      SemaRef.Diag(IList->getBeginLoc(),
-                   diag::warn_neon_vector_initializer_non_portable);
-
-      const char *typeCode;
-      unsigned typeSize = SemaRef.Context.getTypeSize(elementType);
-
-      if (elementType->isFloatingType())
-        typeCode = "f";
-      else if (elementType->isSignedIntegerType())
-        typeCode = "s";
-      else if (elementType->isUnsignedIntegerType())
-        typeCode = "u";
-      else
-        llvm_unreachable("Invalid element type!");
-
-      SemaRef.Diag(IList->getBeginLoc(),
-                   SemaRef.Context.getTypeSize(VT) > 64
-                       ? diag::note_neon_vector_initializer_non_portable_q
-                       : diag::note_neon_vector_initializer_non_portable)
-          << typeCode << typeSize;
-    }
-
-    return;
-  }
-
-  InitializedEntity ElementEntity =
-    InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
-
-  // OpenCL initializers allows vectors to be constructed from vectors.
-  for (unsigned i = 0; i < maxElements; ++i) {
-    // Don't attempt to go past the end of the init list
-    if (Index >= IList->getNumInits())
-      break;
-
-    ElementEntity.setElementIndex(Index);
-
-    QualType IType = IList->getInit(Index)->getType();
-    if (!IType->isVectorType()) {
-      CheckSubElementType(ElementEntity, IList, elementType, Index,
-                          StructuredList, StructuredIndex);
-      ++numEltsInit;
-    } else {
-      QualType VecType;
-      const VectorType *IVT = IType->getAs<VectorType>();
-      unsigned numIElts = IVT->getNumElements();
-
-      if (IType->isExtVectorType())
-        VecType = SemaRef.Context.getExtVectorType(elementType, numIElts);
-      else
-        VecType = SemaRef.Context.getVectorType(elementType, numIElts,
-                                                IVT->getVectorKind());
-      CheckSubElementType(ElementEntity, IList, VecType, Index,
-                          StructuredList, StructuredIndex);
-      numEltsInit += numIElts;
-    }
-  }
-
-  // OpenCL requires all elements to be initialized.
-  if (numEltsInit != maxElements) {
-    if (!VerifyOnly)
-      SemaRef.Diag(IList->getBeginLoc(),
-                   diag::err_vector_incorrect_num_initializers)
-          << (numEltsInit < maxElements) << maxElements << numEltsInit;
-    hadError = true;
-  }
-}
-
-void InitListChecker::CheckArrayType(const InitializedEntity &Entity,
-                                     InitListExpr *IList, QualType &DeclType,
-                                     llvm::APSInt elementIndex,
-                                     bool SubobjectIsDesignatorContext,
-                                     unsigned &Index,
-                                     InitListExpr *StructuredList,
-                                     unsigned &StructuredIndex) {
-  const ArrayType *arrayType = SemaRef.Context.getAsArrayType(DeclType);
-
-  // Check for the special-case of initializing an array with a string.
-  if (Index < IList->getNumInits()) {
-    if (IsStringInit(IList->getInit(Index), arrayType, SemaRef.Context) ==
-        SIF_None) {
-      // We place the string literal directly into the resulting
-      // initializer list. This is the only place where the structure
-      // of the structured initializer list doesn't match exactly,
-      // because doing so would involve allocating one character
-      // constant for each string.
-      if (!VerifyOnly) {
-        CheckStringInit(IList->getInit(Index), DeclType, arrayType, SemaRef);
-        UpdateStructuredListElement(StructuredList, StructuredIndex,
-                                    IList->getInit(Index));
-        StructuredList->resizeInits(SemaRef.Context, StructuredIndex);
-      }
-      ++Index;
-      return;
-    }
-  }
-  if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(arrayType)) {
-    // Check for VLAs; in standard C it would be possible to check this
-    // earlier, but I don't know where clang accepts VLAs (gcc accepts
-    // them in all sorts of strange places).
-    if (!VerifyOnly)
-      SemaRef.Diag(VAT->getSizeExpr()->getBeginLoc(),
-                   diag::err_variable_object_no_init)
-          << VAT->getSizeExpr()->getSourceRange();
-    hadError = true;
-    ++Index;
-    ++StructuredIndex;
-    return;
-  }
-
-  // We might know the maximum number of elements in advance.
-  llvm::APSInt maxElements(elementIndex.getBitWidth(),
-                           elementIndex.isUnsigned());
-  bool maxElementsKnown = false;
-  if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(arrayType)) {
-    maxElements = CAT->getSize();
-    elementIndex = elementIndex.extOrTrunc(maxElements.getBitWidth());
-    elementIndex.setIsUnsigned(maxElements.isUnsigned());
-    maxElementsKnown = true;
-  }
-
-  QualType elementType = arrayType->getElementType();
-  while (Index < IList->getNumInits()) {
-    Expr *Init = IList->getInit(Index);
-    if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
-      // If we're not the subobject that matches up with the '{' for
-      // the designator, we shouldn't be handling the
-      // designator. Return immediately.
-      if (!SubobjectIsDesignatorContext)
-        return;
-
-      // Handle this designated initializer. elementIndex will be
-      // updated to be the next array element we'll initialize.
-      if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
-                                     DeclType, nullptr, &elementIndex, Index,
-                                     StructuredList, StructuredIndex, true,
-                                     false)) {
-        hadError = true;
-        continue;
-      }
-
-      if (elementIndex.getBitWidth() > maxElements.getBitWidth())
-        maxElements = maxElements.extend(elementIndex.getBitWidth());
-      else if (elementIndex.getBitWidth() < maxElements.getBitWidth())
-        elementIndex = elementIndex.extend(maxElements.getBitWidth());
-      elementIndex.setIsUnsigned(maxElements.isUnsigned());
-
-      // If the array is of incomplete type, keep track of the number of
-      // elements in the initializer.
-      if (!maxElementsKnown && elementIndex > maxElements)
-        maxElements = elementIndex;
-
-      continue;
-    }
-
-    // If we know the maximum number of elements, and we've already
-    // hit it, stop consuming elements in the initializer list.
-    if (maxElementsKnown && elementIndex == maxElements)
-      break;
-
-    InitializedEntity ElementEntity =
-      InitializedEntity::InitializeElement(SemaRef.Context, StructuredIndex,
-                                           Entity);
-    // Check this element.
-    CheckSubElementType(ElementEntity, IList, elementType, Index,
-                        StructuredList, StructuredIndex);
-    ++elementIndex;
-
-    // If the array is of incomplete type, keep track of the number of
-    // elements in the initializer.
-    if (!maxElementsKnown && elementIndex > maxElements)
-      maxElements = elementIndex;
-  }
-  if (!hadError && DeclType->isIncompleteArrayType() && !VerifyOnly) {
-    // If this is an incomplete array type, the actual type needs to
-    // be calculated here.
-    llvm::APSInt Zero(maxElements.getBitWidth(), maxElements.isUnsigned());
-    if (maxElements == Zero && !Entity.isVariableLengthArrayNew()) {
-      // Sizing an array implicitly to zero is not allowed by ISO C,
-      // but is supported by GNU.
-      SemaRef.Diag(IList->getBeginLoc(), diag::ext_typecheck_zero_array_size);
-    }
-
-    DeclType = SemaRef.Context.getConstantArrayType(elementType, maxElements,
-                                                     ArrayType::Normal, 0);
-  }
-  if (!hadError && VerifyOnly) {
-    // If there are any members of the array that get value-initialized, check
-    // that is possible. That happens if we know the bound and don't have
-    // enough elements, or if we're performing an array new with an unknown
-    // bound.
-    // FIXME: This needs to detect holes left by designated initializers too.
-    if ((maxElementsKnown && elementIndex < maxElements) ||
-        Entity.isVariableLengthArrayNew())
-      CheckEmptyInitializable(
-          InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
-          IList->getEndLoc());
-  }
-}
-
-bool InitListChecker::CheckFlexibleArrayInit(const InitializedEntity &Entity,
-                                             Expr *InitExpr,
-                                             FieldDecl *Field,
-                                             bool TopLevelObject) {
-  // Handle GNU flexible array initializers.
-  unsigned FlexArrayDiag;
-  if (isa<InitListExpr>(InitExpr) &&
-      cast<InitListExpr>(InitExpr)->getNumInits() == 0) {
-    // Empty flexible array init always allowed as an extension
-    FlexArrayDiag = diag::ext_flexible_array_init;
-  } else if (SemaRef.getLangOpts().CPlusPlus) {
-    // Disallow flexible array init in C++; it is not required for gcc
-    // compatibility, and it needs work to IRGen correctly in general.
-    FlexArrayDiag = diag::err_flexible_array_init;
-  } else if (!TopLevelObject) {
-    // Disallow flexible array init on non-top-level object
-    FlexArrayDiag = diag::err_flexible_array_init;
-  } else if (Entity.getKind() != InitializedEntity::EK_Variable) {
-    // Disallow flexible array init on anything which is not a variable.
-    FlexArrayDiag = diag::err_flexible_array_init;
-  } else if (cast<VarDecl>(Entity.getDecl())->hasLocalStorage()) {
-    // Disallow flexible array init on local variables.
-    FlexArrayDiag = diag::err_flexible_array_init;
-  } else {
-    // Allow other cases.
-    FlexArrayDiag = diag::ext_flexible_array_init;
-  }
-
-  if (!VerifyOnly) {
-    SemaRef.Diag(InitExpr->getBeginLoc(), FlexArrayDiag)
-        << InitExpr->getBeginLoc();
-    SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
-      << Field;
-  }
-
-  return FlexArrayDiag != diag::ext_flexible_array_init;
-}
-
-/// Check if the type of a class element has an accessible destructor.
-///
-/// Aggregate initialization requires a class element's destructor be
-/// accessible per 11.6.1 [dcl.init.aggr]:
-///
-/// The destructor for each element of class type is potentially invoked
-/// (15.4 [class.dtor]) from the context where the aggregate initialization
-/// occurs.
-static bool hasAccessibleDestructor(QualType ElementType, SourceLocation Loc,
-                                    Sema &SemaRef) {
-  auto *CXXRD = ElementType->getAsCXXRecordDecl();
-  if (!CXXRD)
-    return false;
-
-  CXXDestructorDecl *Destructor = SemaRef.LookupDestructor(CXXRD);
-  SemaRef.CheckDestructorAccess(Loc, Destructor,
-                                SemaRef.PDiag(diag::err_access_dtor_temp)
-                                    << ElementType);
-  SemaRef.MarkFunctionReferenced(Loc, Destructor);
-  if (SemaRef.DiagnoseUseOfDecl(Destructor, Loc))
-    return true;
-  return false;
-}
-
-void InitListChecker::CheckStructUnionTypes(
-    const InitializedEntity &Entity, InitListExpr *IList, QualType DeclType,
-    CXXRecordDecl::base_class_range Bases, RecordDecl::field_iterator Field,
-    bool SubobjectIsDesignatorContext, unsigned &Index,
-    InitListExpr *StructuredList, unsigned &StructuredIndex,
-    bool TopLevelObject) {
-  RecordDecl *structDecl = DeclType->getAs<RecordType>()->getDecl();
-
-  // If the record is invalid, some of it's members are invalid. To avoid
-  // confusion, we forgo checking the intializer for the entire record.
-  if (structDecl->isInvalidDecl()) {
-    // Assume it was supposed to consume a single initializer.
-    ++Index;
-    hadError = true;
-    return;
-  }
-
-  if (DeclType->isUnionType() && IList->getNumInits() == 0) {
-    RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl();
-
-    if (!VerifyOnly)
-      for (FieldDecl *FD : RD->fields()) {
-        QualType ET = SemaRef.Context.getBaseElementType(FD->getType());
-        if (hasAccessibleDestructor(ET, IList->getEndLoc(), SemaRef)) {
-          hadError = true;
-          return;
-        }
-      }
-
-    // If there's a default initializer, use it.
-    if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->hasInClassInitializer()) {
-      if (VerifyOnly)
-        return;
-      for (RecordDecl::field_iterator FieldEnd = RD->field_end();
-           Field != FieldEnd; ++Field) {
-        if (Field->hasInClassInitializer()) {
-          StructuredList->setInitializedFieldInUnion(*Field);
-          // FIXME: Actually build a CXXDefaultInitExpr?
-          return;
-        }
-      }
-    }
-
-    // Value-initialize the first member of the union that isn't an unnamed
-    // bitfield.
-    for (RecordDecl::field_iterator FieldEnd = RD->field_end();
-         Field != FieldEnd; ++Field) {
-      if (!Field->isUnnamedBitfield()) {
-        if (VerifyOnly)
-          CheckEmptyInitializable(
-              InitializedEntity::InitializeMember(*Field, &Entity),
-              IList->getEndLoc());
-        else
-          StructuredList->setInitializedFieldInUnion(*Field);
-        break;
-      }
-    }
-    return;
-  }
-
-  bool InitializedSomething = false;
-
-  // If we have any base classes, they are initialized prior to the fields.
-  for (auto &Base : Bases) {
-    Expr *Init = Index < IList->getNumInits() ? IList->getInit(Index) : nullptr;
-
-    // Designated inits always initialize fields, so if we see one, all
-    // remaining base classes have no explicit initializer.
-    if (Init && isa<DesignatedInitExpr>(Init))
-      Init = nullptr;
-
-    SourceLocation InitLoc = Init ? Init->getBeginLoc() : IList->getEndLoc();
-    InitializedEntity BaseEntity = InitializedEntity::InitializeBase(
-        SemaRef.Context, &Base, false, &Entity);
-    if (Init) {
-      CheckSubElementType(BaseEntity, IList, Base.getType(), Index,
-                          StructuredList, StructuredIndex);
-      InitializedSomething = true;
-    } else if (VerifyOnly) {
-      CheckEmptyInitializable(BaseEntity, InitLoc);
-    }
-
-    if (!VerifyOnly)
-      if (hasAccessibleDestructor(Base.getType(), InitLoc, SemaRef)) {
-        hadError = true;
-        return;
-      }
-  }
-
-  // If structDecl is a forward declaration, this loop won't do
-  // anything except look at designated initializers; That's okay,
-  // because an error should get printed out elsewhere. It might be
-  // worthwhile to skip over the rest of the initializer, though.
-  RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl();
-  RecordDecl::field_iterator FieldEnd = RD->field_end();
-  bool CheckForMissingFields =
-    !IList->isIdiomaticZeroInitializer(SemaRef.getLangOpts());
-  bool HasDesignatedInit = false;
-
-  while (Index < IList->getNumInits()) {
-    Expr *Init = IList->getInit(Index);
-    SourceLocation InitLoc = Init->getBeginLoc();
-
-    if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
-      // If we're not the subobject that matches up with the '{' for
-      // the designator, we shouldn't be handling the
-      // designator. Return immediately.
-      if (!SubobjectIsDesignatorContext)
-        return;
-
-      HasDesignatedInit = true;
-
-      // Handle this designated initializer. Field will be updated to
-      // the next field that we'll be initializing.
-      if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
-                                     DeclType, &Field, nullptr, Index,
-                                     StructuredList, StructuredIndex,
-                                     true, TopLevelObject))
-        hadError = true;
-      else if (!VerifyOnly) {
-        // Find the field named by the designated initializer.
-        RecordDecl::field_iterator F = RD->field_begin();
-        while (std::next(F) != Field)
-          ++F;
-        QualType ET = SemaRef.Context.getBaseElementType(F->getType());
-        if (hasAccessibleDestructor(ET, InitLoc, SemaRef)) {
-          hadError = true;
-          return;
-        }
-      }
-
-      InitializedSomething = true;
-
-      // Disable check for missing fields when designators are used.
-      // This matches gcc behaviour.
-      CheckForMissingFields = false;
-      continue;
-    }
-
-    if (Field == FieldEnd) {
-      // We've run out of fields. We're done.
-      break;
-    }
-
-    // We've already initialized a member of a union. We're done.
-    if (InitializedSomething && DeclType->isUnionType())
-      break;
-
-    // If we've hit the flexible array member at the end, we're done.
-    if (Field->getType()->isIncompleteArrayType())
-      break;
-
-    if (Field->isUnnamedBitfield()) {
-      // Don't initialize unnamed bitfields, e.g. "int : 20;"
-      ++Field;
-      continue;
-    }
-
-    // Make sure we can use this declaration.
-    bool InvalidUse;
-    if (VerifyOnly)
-      InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid);
-    else
-      InvalidUse = SemaRef.DiagnoseUseOfDecl(
-          *Field, IList->getInit(Index)->getBeginLoc());
-    if (InvalidUse) {
-      ++Index;
-      ++Field;
-      hadError = true;
-      continue;
-    }
-
-    if (!VerifyOnly) {
-      QualType ET = SemaRef.Context.getBaseElementType(Field->getType());
-      if (hasAccessibleDestructor(ET, InitLoc, SemaRef)) {
-        hadError = true;
-        return;
-      }
-    }
-
-    InitializedEntity MemberEntity =
-      InitializedEntity::InitializeMember(*Field, &Entity);
-    CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
-                        StructuredList, StructuredIndex);
-    InitializedSomething = true;
-
-    if (DeclType->isUnionType() && !VerifyOnly) {
-      // Initialize the first field within the union.
-      StructuredList->setInitializedFieldInUnion(*Field);
-    }
-
-    ++Field;
-  }
-
-  // Emit warnings for missing struct field initializers.
-  if (!VerifyOnly && InitializedSomething && CheckForMissingFields &&
-      Field != FieldEnd && !Field->getType()->isIncompleteArrayType() &&
-      !DeclType->isUnionType()) {
-    // It is possible we have one or more unnamed bitfields remaining.
-    // Find first (if any) named field and emit warning.
-    for (RecordDecl::field_iterator it = Field, end = RD->field_end();
-         it != end; ++it) {
-      if (!it->isUnnamedBitfield() && !it->hasInClassInitializer()) {
-        SemaRef.Diag(IList->getSourceRange().getEnd(),
-                     diag::warn_missing_field_initializers) << *it;
-        break;
-      }
-    }
-  }
-
-  // Check that any remaining fields can be value-initialized.
-  if (VerifyOnly && Field != FieldEnd && !DeclType->isUnionType() &&
-      !Field->getType()->isIncompleteArrayType()) {
-    // FIXME: Should check for holes left by designated initializers too.
-    for (; Field != FieldEnd && !hadError; ++Field) {
-      if (!Field->isUnnamedBitfield() && !Field->hasInClassInitializer())
-        CheckEmptyInitializable(
-            InitializedEntity::InitializeMember(*Field, &Entity),
-            IList->getEndLoc());
-    }
-  }
-
-  // Check that the types of the remaining fields have accessible destructors.
-  if (!VerifyOnly) {
-    // If the initializer expression has a designated initializer, check the
-    // elements for which a designated initializer is not provided too.
-    RecordDecl::field_iterator I = HasDesignatedInit ? RD->field_begin()
-                                                     : Field;
-    for (RecordDecl::field_iterator E = RD->field_end(); I != E; ++I) {
-      QualType ET = SemaRef.Context.getBaseElementType(I->getType());
-      if (hasAccessibleDestructor(ET, IList->getEndLoc(), SemaRef)) {
-        hadError = true;
-        return;
-      }
-    }
-  }
-
-  if (Field == FieldEnd || !Field->getType()->isIncompleteArrayType() ||
-      Index >= IList->getNumInits())
-    return;
-
-  if (CheckFlexibleArrayInit(Entity, IList->getInit(Index), *Field,
-                             TopLevelObject)) {
-    hadError = true;
-    ++Index;
-    return;
-  }
-
-  InitializedEntity MemberEntity =
-    InitializedEntity::InitializeMember(*Field, &Entity);
-
-  if (isa<InitListExpr>(IList->getInit(Index)))
-    CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
-                        StructuredList, StructuredIndex);
-  else
-    CheckImplicitInitList(MemberEntity, IList, Field->getType(), Index,
-                          StructuredList, StructuredIndex);
-}
-
-/// Expand a field designator that refers to a member of an
-/// anonymous struct or union into a series of field designators that
-/// refers to the field within the appropriate subobject.
-///
-static void ExpandAnonymousFieldDesignator(Sema &SemaRef,
-                                           DesignatedInitExpr *DIE,
-                                           unsigned DesigIdx,
-                                           IndirectFieldDecl *IndirectField) {
-  typedef DesignatedInitExpr::Designator Designator;
-
-  // Build the replacement designators.
-  SmallVector<Designator, 4> Replacements;
-  for (IndirectFieldDecl::chain_iterator PI = IndirectField->chain_begin(),
-       PE = IndirectField->chain_end(); PI != PE; ++PI) {
-    if (PI + 1 == PE)
-      Replacements.push_back(Designator((IdentifierInfo *)nullptr,
-                                    DIE->getDesignator(DesigIdx)->getDotLoc(),
-                                DIE->getDesignator(DesigIdx)->getFieldLoc()));
-    else
-      Replacements.push_back(Designator((IdentifierInfo *)nullptr,
-                                        SourceLocation(), SourceLocation()));
-    assert(isa<FieldDecl>(*PI));
-    Replacements.back().setField(cast<FieldDecl>(*PI));
-  }
-
-  // Expand the current designator into the set of replacement
-  // designators, so we have a full subobject path down to where the
-  // member of the anonymous struct/union is actually stored.
-  DIE->ExpandDesignator(SemaRef.Context, DesigIdx, &Replacements[0],
-                        &Replacements[0] + Replacements.size());
-}
-
-static DesignatedInitExpr *CloneDesignatedInitExpr(Sema &SemaRef,
-                                                   DesignatedInitExpr *DIE) {
-  unsigned NumIndexExprs = DIE->getNumSubExprs() - 1;
-  SmallVector<Expr*, 4> IndexExprs(NumIndexExprs);
-  for (unsigned I = 0; I < NumIndexExprs; ++I)
-    IndexExprs[I] = DIE->getSubExpr(I + 1);
-  return DesignatedInitExpr::Create(SemaRef.Context, DIE->designators(),
-                                    IndexExprs,
-                                    DIE->getEqualOrColonLoc(),
-                                    DIE->usesGNUSyntax(), DIE->getInit());
-}
-
-namespace {
-
-// Callback to only accept typo corrections that are for field members of
-// the given struct or union.
-class FieldInitializerValidatorCCC : public CorrectionCandidateCallback {
- public:
-  explicit FieldInitializerValidatorCCC(RecordDecl *RD)
-      : Record(RD) {}
-
-  bool ValidateCandidate(const TypoCorrection &candidate) override {
-    FieldDecl *FD = candidate.getCorrectionDeclAs<FieldDecl>();
-    return FD && FD->getDeclContext()->getRedeclContext()->Equals(Record);
-  }
-
- private:
-  RecordDecl *Record;
-};
-
-} // end anonymous namespace
-
-/// Check the well-formedness of a C99 designated initializer.
-///
-/// Determines whether the designated initializer @p DIE, which
-/// resides at the given @p Index within the initializer list @p
-/// IList, is well-formed for a current object of type @p DeclType
-/// (C99 6.7.8). The actual subobject that this designator refers to
-/// within the current subobject is returned in either
-/// @p NextField or @p NextElementIndex (whichever is appropriate).
-///
-/// @param IList  The initializer list in which this designated
-/// initializer occurs.
-///
-/// @param DIE The designated initializer expression.
-///
-/// @param DesigIdx  The index of the current designator.
-///
-/// @param CurrentObjectType The type of the "current object" (C99 6.7.8p17),
-/// into which the designation in @p DIE should refer.
-///
-/// @param NextField  If non-NULL and the first designator in @p DIE is
-/// a field, this will be set to the field declaration corresponding
-/// to the field named by the designator.
-///
-/// @param NextElementIndex  If non-NULL and the first designator in @p
-/// DIE is an array designator or GNU array-range designator, this
-/// will be set to the last index initialized by this designator.
-///
-/// @param Index  Index into @p IList where the designated initializer
-/// @p DIE occurs.
-///
-/// @param StructuredList  The initializer list expression that
-/// describes all of the subobject initializers in the order they'll
-/// actually be initialized.
-///
-/// @returns true if there was an error, false otherwise.
-bool
-InitListChecker::CheckDesignatedInitializer(const InitializedEntity &Entity,
-                                            InitListExpr *IList,
-                                            DesignatedInitExpr *DIE,
-                                            unsigned DesigIdx,
-                                            QualType &CurrentObjectType,
-                                          RecordDecl::field_iterator *NextField,
-                                            llvm::APSInt *NextElementIndex,
-                                            unsigned &Index,
-                                            InitListExpr *StructuredList,
-                                            unsigned &StructuredIndex,
-                                            bool FinishSubobjectInit,
-                                            bool TopLevelObject) {
-  if (DesigIdx == DIE->size()) {
-    // Check the actual initialization for the designated object type.
-    bool prevHadError = hadError;
-
-    // Temporarily remove the designator expression from the
-    // initializer list that the child calls see, so that we don't try
-    // to re-process the designator.
-    unsigned OldIndex = Index;
-    IList->setInit(OldIndex, DIE->getInit());
-
-    CheckSubElementType(Entity, IList, CurrentObjectType, Index,
-                        StructuredList, StructuredIndex);
-
-    // Restore the designated initializer expression in the syntactic
-    // form of the initializer list.
-    if (IList->getInit(OldIndex) != DIE->getInit())
-      DIE->setInit(IList->getInit(OldIndex));
-    IList->setInit(OldIndex, DIE);
-
-    return hadError && !prevHadError;
-  }
-
-  DesignatedInitExpr::Designator *D = DIE->getDesignator(DesigIdx);
-  bool IsFirstDesignator = (DesigIdx == 0);
-  if (!VerifyOnly) {
-    assert((IsFirstDesignator || StructuredList) &&
-           "Need a non-designated initializer list to start from");
-
-    // Determine the structural initializer list that corresponds to the
-    // current subobject.
-    if (IsFirstDesignator)
-      StructuredList = SyntacticToSemantic.lookup(IList);
-    else {
-      Expr *ExistingInit = StructuredIndex < StructuredList->getNumInits() ?
-          StructuredList->getInit(StructuredIndex) : nullptr;
-      if (!ExistingInit && StructuredList->hasArrayFiller())
-        ExistingInit = StructuredList->getArrayFiller();
-
-      if (!ExistingInit)
-        StructuredList = getStructuredSubobjectInit(
-            IList, Index, CurrentObjectType, StructuredList, StructuredIndex,
-            SourceRange(D->getBeginLoc(), DIE->getEndLoc()));
-      else if (InitListExpr *Result = dyn_cast<InitListExpr>(ExistingInit))
-        StructuredList = Result;
-      else {
-        if (DesignatedInitUpdateExpr *E =
-                dyn_cast<DesignatedInitUpdateExpr>(ExistingInit))
-          StructuredList = E->getUpdater();
-        else {
-          DesignatedInitUpdateExpr *DIUE = new (SemaRef.Context)
-              DesignatedInitUpdateExpr(SemaRef.Context, D->getBeginLoc(),
-                                       ExistingInit, DIE->getEndLoc());
-          StructuredList->updateInit(SemaRef.Context, StructuredIndex, DIUE);
-          StructuredList = DIUE->getUpdater();
-        }
-
-        // We need to check on source range validity because the previous
-        // initializer does not have to be an explicit initializer. e.g.,
-        //
-        // struct P { int a, b; };
-        // struct PP { struct P p } l = { { .a = 2 }, .p.b = 3 };
-        //
-        // There is an overwrite taking place because the first braced initializer
-        // list "{ .a = 2 }" already provides value for .p.b (which is zero).
-        if (ExistingInit->getSourceRange().isValid()) {
-          // We are creating an initializer list that initializes the
-          // subobjects of the current object, but there was already an
-          // initialization that completely initialized the current
-          // subobject, e.g., by a compound literal:
-          //
-          // struct X { int a, b; };
-          // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
-          //
-          // Here, xs[0].a == 0 and xs[0].b == 3, since the second,
-          // designated initializer re-initializes the whole
-          // subobject [0], overwriting previous initializers.
-          SemaRef.Diag(D->getBeginLoc(),
-                       diag::warn_subobject_initializer_overrides)
-              << SourceRange(D->getBeginLoc(), DIE->getEndLoc());
-
-          SemaRef.Diag(ExistingInit->getBeginLoc(),
-                       diag::note_previous_initializer)
-              << /*FIXME:has side effects=*/0 << ExistingInit->getSourceRange();
-        }
-      }
-    }
-    assert(StructuredList && "Expected a structured initializer list");
-  }
-
-  if (D->isFieldDesignator()) {
-    // C99 6.7.8p7:
-    //
-    //   If a designator has the form
-    //
-    //      . identifier
-    //
-    //   then the current object (defined below) shall have
-    //   structure or union type and the identifier shall be the
-    //   name of a member of that type.
-    const RecordType *RT = CurrentObjectType->getAs<RecordType>();
-    if (!RT) {
-      SourceLocation Loc = D->getDotLoc();
-      if (Loc.isInvalid())
-        Loc = D->getFieldLoc();
-      if (!VerifyOnly)
-        SemaRef.Diag(Loc, diag::err_field_designator_non_aggr)
-          << SemaRef.getLangOpts().CPlusPlus << CurrentObjectType;
-      ++Index;
-      return true;
-    }
-
-    FieldDecl *KnownField = D->getField();
-    if (!KnownField) {
-      IdentifierInfo *FieldName = D->getFieldName();
-      DeclContext::lookup_result Lookup = RT->getDecl()->lookup(FieldName);
-      for (NamedDecl *ND : Lookup) {
-        if (auto *FD = dyn_cast<FieldDecl>(ND)) {
-          KnownField = FD;
-          break;
-        }
-        if (auto *IFD = dyn_cast<IndirectFieldDecl>(ND)) {
-          // In verify mode, don't modify the original.
-          if (VerifyOnly)
-            DIE = CloneDesignatedInitExpr(SemaRef, DIE);
-          ExpandAnonymousFieldDesignator(SemaRef, DIE, DesigIdx, IFD);
-          D = DIE->getDesignator(DesigIdx);
-          KnownField = cast<FieldDecl>(*IFD->chain_begin());
-          break;
-        }
-      }
-      if (!KnownField) {
-        if (VerifyOnly) {
-          ++Index;
-          return true;  // No typo correction when just trying this out.
-        }
-
-        // Name lookup found something, but it wasn't a field.
-        if (!Lookup.empty()) {
-          SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_nonfield)
-            << FieldName;
-          SemaRef.Diag(Lookup.front()->getLocation(),
-                       diag::note_field_designator_found);
-          ++Index;
-          return true;
-        }
-
-        // Name lookup didn't find anything.
-        // Determine whether this was a typo for another field name.
-        if (TypoCorrection Corrected = SemaRef.CorrectTypo(
-                DeclarationNameInfo(FieldName, D->getFieldLoc()),
-                Sema::LookupMemberName, /*Scope=*/nullptr, /*SS=*/nullptr,
-                llvm::make_unique<FieldInitializerValidatorCCC>(RT->getDecl()),
-                Sema::CTK_ErrorRecovery, RT->getDecl())) {
-          SemaRef.diagnoseTypo(
-              Corrected,
-              SemaRef.PDiag(diag::err_field_designator_unknown_suggest)
-                << FieldName << CurrentObjectType);
-          KnownField = Corrected.getCorrectionDeclAs<FieldDecl>();
-          hadError = true;
-        } else {
-          // Typo correction didn't find anything.
-          SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_unknown)
-            << FieldName << CurrentObjectType;
-          ++Index;
-          return true;
-        }
-      }
-    }
-
-    unsigned FieldIndex = 0;
-
-    if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
-      FieldIndex = CXXRD->getNumBases();
-
-    for (auto *FI : RT->getDecl()->fields()) {
-      if (FI->isUnnamedBitfield())
-        continue;
-      if (declaresSameEntity(KnownField, FI)) {
-        KnownField = FI;
-        break;
-      }
-      ++FieldIndex;
-    }
-
-    RecordDecl::field_iterator Field =
-        RecordDecl::field_iterator(DeclContext::decl_iterator(KnownField));
-
-    // All of the fields of a union are located at the same place in
-    // the initializer list.
-    if (RT->getDecl()->isUnion()) {
-      FieldIndex = 0;
-      if (!VerifyOnly) {
-        FieldDecl *CurrentField = StructuredList->getInitializedFieldInUnion();
-        if (CurrentField && !declaresSameEntity(CurrentField, *Field)) {
-          assert(StructuredList->getNumInits() == 1
-                 && "A union should never have more than one initializer!");
-
-          Expr *ExistingInit = StructuredList->getInit(0);
-          if (ExistingInit) {
-            // We're about to throw away an initializer, emit warning.
-            SemaRef.Diag(D->getFieldLoc(),
-                         diag::warn_initializer_overrides)
-              << D->getSourceRange();
-            SemaRef.Diag(ExistingInit->getBeginLoc(),
-                         diag::note_previous_initializer)
-                << /*FIXME:has side effects=*/0
-                << ExistingInit->getSourceRange();
-          }
-
-          // remove existing initializer
-          StructuredList->resizeInits(SemaRef.Context, 0);
-          StructuredList->setInitializedFieldInUnion(nullptr);
-        }
-
-        StructuredList->setInitializedFieldInUnion(*Field);
-      }
-    }
-
-    // Make sure we can use this declaration.
-    bool InvalidUse;
-    if (VerifyOnly)
-      InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid);
-    else
-      InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field, D->getFieldLoc());
-    if (InvalidUse) {
-      ++Index;
-      return true;
-    }
-
-    if (!VerifyOnly) {
-      // Update the designator with the field declaration.
-      D->setField(*Field);
-
-      // Make sure that our non-designated initializer list has space
-      // for a subobject corresponding to this field.
-      if (FieldIndex >= StructuredList->getNumInits())
-        StructuredList->resizeInits(SemaRef.Context, FieldIndex + 1);
-    }
-
-    // This designator names a flexible array member.
-    if (Field->getType()->isIncompleteArrayType()) {
-      bool Invalid = false;
-      if ((DesigIdx + 1) != DIE->size()) {
-        // We can't designate an object within the flexible array
-        // member (because GCC doesn't allow it).
-        if (!VerifyOnly) {
-          DesignatedInitExpr::Designator *NextD
-            = DIE->getDesignator(DesigIdx + 1);
-          SemaRef.Diag(NextD->getBeginLoc(),
-                       diag::err_designator_into_flexible_array_member)
-              << SourceRange(NextD->getBeginLoc(), DIE->getEndLoc());
-          SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
-            << *Field;
-        }
-        Invalid = true;
-      }
-
-      if (!hadError && !isa<InitListExpr>(DIE->getInit()) &&
-          !isa<StringLiteral>(DIE->getInit())) {
-        // The initializer is not an initializer list.
-        if (!VerifyOnly) {
-          SemaRef.Diag(DIE->getInit()->getBeginLoc(),
-                       diag::err_flexible_array_init_needs_braces)
-              << DIE->getInit()->getSourceRange();
-          SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
-            << *Field;
-        }
-        Invalid = true;
-      }
-
-      // Check GNU flexible array initializer.
-      if (!Invalid && CheckFlexibleArrayInit(Entity, DIE->getInit(), *Field,
-                                             TopLevelObject))
-        Invalid = true;
-
-      if (Invalid) {
-        ++Index;
-        return true;
-      }
-
-      // Initialize the array.
-      bool prevHadError = hadError;
-      unsigned newStructuredIndex = FieldIndex;
-      unsigned OldIndex = Index;
-      IList->setInit(Index, DIE->getInit());
-
-      InitializedEntity MemberEntity =
-        InitializedEntity::InitializeMember(*Field, &Entity);
-      CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
-                          StructuredList, newStructuredIndex);
-
-      IList->setInit(OldIndex, DIE);
-      if (hadError && !prevHadError) {
-        ++Field;
-        ++FieldIndex;
-        if (NextField)
-          *NextField = Field;
-        StructuredIndex = FieldIndex;
-        return true;
-      }
-    } else {
-      // Recurse to check later designated subobjects.
-      QualType FieldType = Field->getType();
-      unsigned newStructuredIndex = FieldIndex;
-
-      InitializedEntity MemberEntity =
-        InitializedEntity::InitializeMember(*Field, &Entity);
-      if (CheckDesignatedInitializer(MemberEntity, IList, DIE, DesigIdx + 1,
-                                     FieldType, nullptr, nullptr, Index,
-                                     StructuredList, newStructuredIndex,
-                                     FinishSubobjectInit, false))
-        return true;
-    }
-
-    // Find the position of the next field to be initialized in this
-    // subobject.
-    ++Field;
-    ++FieldIndex;
-
-    // If this the first designator, our caller will continue checking
-    // the rest of this struct/class/union subobject.
-    if (IsFirstDesignator) {
-      if (NextField)
-        *NextField = Field;
-      StructuredIndex = FieldIndex;
-      return false;
-    }
-
-    if (!FinishSubobjectInit)
-      return false;
-
-    // We've already initialized something in the union; we're done.
-    if (RT->getDecl()->isUnion())
-      return hadError;
-
-    // Check the remaining fields within this class/struct/union subobject.
-    bool prevHadError = hadError;
-
-    auto NoBases =
-        CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(),
-                                        CXXRecordDecl::base_class_iterator());
-    CheckStructUnionTypes(Entity, IList, CurrentObjectType, NoBases, Field,
-                          false, Index, StructuredList, FieldIndex);
-    return hadError && !prevHadError;
-  }
-
-  // C99 6.7.8p6:
-  //
-  //   If a designator has the form
-  //
-  //      [ constant-expression ]
-  //
-  //   then the current object (defined below) shall have array
-  //   type and the expression shall be an integer constant
-  //   expression. If the array is of unknown size, any
-  //   nonnegative value is valid.
-  //
-  // Additionally, cope with the GNU extension that permits
-  // designators of the form
-  //
-  //      [ constant-expression ... constant-expression ]
-  const ArrayType *AT = SemaRef.Context.getAsArrayType(CurrentObjectType);
-  if (!AT) {
-    if (!VerifyOnly)
-      SemaRef.Diag(D->getLBracketLoc(), diag::err_array_designator_non_array)
-        << CurrentObjectType;
-    ++Index;
-    return true;
-  }
-
-  Expr *IndexExpr = nullptr;
-  llvm::APSInt DesignatedStartIndex, DesignatedEndIndex;
-  if (D->isArrayDesignator()) {
-    IndexExpr = DIE->getArrayIndex(*D);
-    DesignatedStartIndex = IndexExpr->EvaluateKnownConstInt(SemaRef.Context);
-    DesignatedEndIndex = DesignatedStartIndex;
-  } else {
-    assert(D->isArrayRangeDesignator() && "Need array-range designator");
-
-    DesignatedStartIndex =
-      DIE->getArrayRangeStart(*D)->EvaluateKnownConstInt(SemaRef.Context);
-    DesignatedEndIndex =
-      DIE->getArrayRangeEnd(*D)->EvaluateKnownConstInt(SemaRef.Context);
-    IndexExpr = DIE->getArrayRangeEnd(*D);
-
-    // Codegen can't handle evaluating array range designators that have side
-    // effects, because we replicate the AST value for each initialized element.
-    // As such, set the sawArrayRangeDesignator() bit if we initialize multiple
-    // elements with something that has a side effect, so codegen can emit an
-    // "error unsupported" error instead of miscompiling the app.
-    if (DesignatedStartIndex.getZExtValue()!=DesignatedEndIndex.getZExtValue()&&
-        DIE->getInit()->HasSideEffects(SemaRef.Context) && !VerifyOnly)
-      FullyStructuredList->sawArrayRangeDesignator();
-  }
-
-  if (isa<ConstantArrayType>(AT)) {
-    llvm::APSInt MaxElements(cast<ConstantArrayType>(AT)->getSize(), false);
-    DesignatedStartIndex
-      = DesignatedStartIndex.extOrTrunc(MaxElements.getBitWidth());
-    DesignatedStartIndex.setIsUnsigned(MaxElements.isUnsigned());
-    DesignatedEndIndex
-      = DesignatedEndIndex.extOrTrunc(MaxElements.getBitWidth());
-    DesignatedEndIndex.setIsUnsigned(MaxElements.isUnsigned());
-    if (DesignatedEndIndex >= MaxElements) {
-      if (!VerifyOnly)
-        SemaRef.Diag(IndexExpr->getBeginLoc(),
-                     diag::err_array_designator_too_large)
-            << DesignatedEndIndex.toString(10) << MaxElements.toString(10)
-            << IndexExpr->getSourceRange();
-      ++Index;
-      return true;
-    }
-  } else {
-    unsigned DesignatedIndexBitWidth =
-      ConstantArrayType::getMaxSizeBits(SemaRef.Context);
-    DesignatedStartIndex =
-      DesignatedStartIndex.extOrTrunc(DesignatedIndexBitWidth);
-    DesignatedEndIndex =
-      DesignatedEndIndex.extOrTrunc(DesignatedIndexBitWidth);
-    DesignatedStartIndex.setIsUnsigned(true);
-    DesignatedEndIndex.setIsUnsigned(true);
-  }
-
-  if (!VerifyOnly && StructuredList->isStringLiteralInit()) {
-    // We're modifying a string literal init; we have to decompose the string
-    // so we can modify the individual characters.
-    ASTContext &Context = SemaRef.Context;
-    Expr *SubExpr = StructuredList->getInit(0)->IgnoreParens();
-
-    // Compute the character type
-    QualType CharTy = AT->getElementType();
-
-    // Compute the type of the integer literals.
-    QualType PromotedCharTy = CharTy;
-    if (CharTy->isPromotableIntegerType())
-      PromotedCharTy = Context.getPromotedIntegerType(CharTy);
-    unsigned PromotedCharTyWidth = Context.getTypeSize(PromotedCharTy);
-
-    if (StringLiteral *SL = dyn_cast<StringLiteral>(SubExpr)) {
-      // Get the length of the string.
-      uint64_t StrLen = SL->getLength();
-      if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
-        StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
-      StructuredList->resizeInits(Context, StrLen);
-
-      // Build a literal for each character in the string, and put them into
-      // the init list.
-      for (unsigned i = 0, e = StrLen; i != e; ++i) {
-        llvm::APInt CodeUnit(PromotedCharTyWidth, SL->getCodeUnit(i));
-        Expr *Init = new (Context) IntegerLiteral(
-            Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
-        if (CharTy != PromotedCharTy)
-          Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
-                                          Init, nullptr, VK_RValue);
-        StructuredList->updateInit(Context, i, Init);
-      }
-    } else {
-      ObjCEncodeExpr *E = cast<ObjCEncodeExpr>(SubExpr);
-      std::string Str;
-      Context.getObjCEncodingForType(E->getEncodedType(), Str);
-
-      // Get the length of the string.
-      uint64_t StrLen = Str.size();
-      if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
-        StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
-      StructuredList->resizeInits(Context, StrLen);
-
-      // Build a literal for each character in the string, and put them into
-      // the init list.
-      for (unsigned i = 0, e = StrLen; i != e; ++i) {
-        llvm::APInt CodeUnit(PromotedCharTyWidth, Str[i]);
-        Expr *Init = new (Context) IntegerLiteral(
-            Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
-        if (CharTy != PromotedCharTy)
-          Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
-                                          Init, nullptr, VK_RValue);
-        StructuredList->updateInit(Context, i, Init);
-      }
-    }
-  }
-
-  // Make sure that our non-designated initializer list has space
-  // for a subobject corresponding to this array element.
-  if (!VerifyOnly &&
-      DesignatedEndIndex.getZExtValue() >= StructuredList->getNumInits())
-    StructuredList->resizeInits(SemaRef.Context,
-                                DesignatedEndIndex.getZExtValue() + 1);
-
-  // Repeatedly perform subobject initializations in the range
-  // [DesignatedStartIndex, DesignatedEndIndex].
-
-  // Move to the next designator
-  unsigned ElementIndex = DesignatedStartIndex.getZExtValue();
-  unsigned OldIndex = Index;
-
-  InitializedEntity ElementEntity =
-    InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
-
-  while (DesignatedStartIndex <= DesignatedEndIndex) {
-    // Recurse to check later designated subobjects.
-    QualType ElementType = AT->getElementType();
-    Index = OldIndex;
-
-    ElementEntity.setElementIndex(ElementIndex);
-    if (CheckDesignatedInitializer(
-            ElementEntity, IList, DIE, DesigIdx + 1, ElementType, nullptr,
-            nullptr, Index, StructuredList, ElementIndex,
-            FinishSubobjectInit && (DesignatedStartIndex == DesignatedEndIndex),
-            false))
-      return true;
-
-    // Move to the next index in the array that we'll be initializing.
-    ++DesignatedStartIndex;
-    ElementIndex = DesignatedStartIndex.getZExtValue();
-  }
-
-  // If this the first designator, our caller will continue checking
-  // the rest of this array subobject.
-  if (IsFirstDesignator) {
-    if (NextElementIndex)
-      *NextElementIndex = DesignatedStartIndex;
-    StructuredIndex = ElementIndex;
-    return false;
-  }
-
-  if (!FinishSubobjectInit)
-    return false;
-
-  // Check the remaining elements within this array subobject.
-  bool prevHadError = hadError;
-  CheckArrayType(Entity, IList, CurrentObjectType, DesignatedStartIndex,
-                 /*SubobjectIsDesignatorContext=*/false, Index,
-                 StructuredList, ElementIndex);
-  return hadError && !prevHadError;
-}
-
-// Get the structured initializer list for a subobject of type
-// @p CurrentObjectType.
-InitListExpr *
-InitListChecker::getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
-                                            QualType CurrentObjectType,
-                                            InitListExpr *StructuredList,
-                                            unsigned StructuredIndex,
-                                            SourceRange InitRange,
-                                            bool IsFullyOverwritten) {
-  if (VerifyOnly)
-    return nullptr; // No structured list in verification-only mode.
-  Expr *ExistingInit = nullptr;
-  if (!StructuredList)
-    ExistingInit = SyntacticToSemantic.lookup(IList);
-  else if (StructuredIndex < StructuredList->getNumInits())
-    ExistingInit = StructuredList->getInit(StructuredIndex);
-
-  if (InitListExpr *Result = dyn_cast_or_null<InitListExpr>(ExistingInit))
-    // There might have already been initializers for subobjects of the current
-    // object, but a subsequent initializer list will overwrite the entirety
-    // of the current object. (See DR 253 and C99 6.7.8p21). e.g.,
-    //
-    // struct P { char x[6]; };
-    // struct P l = { .x[2] = 'x', .x = { [0] = 'f' } };
-    //
-    // The first designated initializer is ignored, and l.x is just "f".
-    if (!IsFullyOverwritten)
-      return Result;
-
-  if (ExistingInit) {
-    // We are creating an initializer list that initializes the
-    // subobjects of the current object, but there was already an
-    // initialization that completely initialized the current
-    // subobject, e.g., by a compound literal:
-    //
-    // struct X { int a, b; };
-    // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
-    //
-    // Here, xs[0].a == 0 and xs[0].b == 3, since the second,
-    // designated initializer re-initializes the whole
-    // subobject [0], overwriting previous initializers.
-    SemaRef.Diag(InitRange.getBegin(),
-                 diag::warn_subobject_initializer_overrides)
-      << InitRange;
-    SemaRef.Diag(ExistingInit->getBeginLoc(), diag::note_previous_initializer)
-        << /*FIXME:has side effects=*/0 << ExistingInit->getSourceRange();
-  }
-
-  InitListExpr *Result
-    = new (SemaRef.Context) InitListExpr(SemaRef.Context,
-                                         InitRange.getBegin(), None,
-                                         InitRange.getEnd());
-
-  QualType ResultType = CurrentObjectType;
-  if (!ResultType->isArrayType())
-    ResultType = ResultType.getNonLValueExprType(SemaRef.Context);
-  Result->setType(ResultType);
-
-  // Pre-allocate storage for the structured initializer list.
-  unsigned NumElements = 0;
-  unsigned NumInits = 0;
-  bool GotNumInits = false;
-  if (!StructuredList) {
-    NumInits = IList->getNumInits();
-    GotNumInits = true;
-  } else if (Index < IList->getNumInits()) {
-    if (InitListExpr *SubList = dyn_cast<InitListExpr>(IList->getInit(Index))) {
-      NumInits = SubList->getNumInits();
-      GotNumInits = true;
-    }
-  }
-
-  if (const ArrayType *AType
-      = SemaRef.Context.getAsArrayType(CurrentObjectType)) {
-    if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) {
-      NumElements = CAType->getSize().getZExtValue();
-      // Simple heuristic so that we don't allocate a very large
-      // initializer with many empty entries at the end.
-      if (GotNumInits && NumElements > NumInits)
-        NumElements = 0;
-    }
-  } else if (const VectorType *VType = CurrentObjectType->getAs<VectorType>())
-    NumElements = VType->getNumElements();
-  else if (const RecordType *RType = CurrentObjectType->getAs<RecordType>()) {
-    RecordDecl *RDecl = RType->getDecl();
-    if (RDecl->isUnion())
-      NumElements = 1;
-    else
-      NumElements = std::distance(RDecl->field_begin(), RDecl->field_end());
-  }
-
-  Result->reserveInits(SemaRef.Context, NumElements);
-
-  // Link this new initializer list into the structured initializer
-  // lists.
-  if (StructuredList)
-    StructuredList->updateInit(SemaRef.Context, StructuredIndex, Result);
-  else {
-    Result->setSyntacticForm(IList);
-    SyntacticToSemantic[IList] = Result;
-  }
-
-  return Result;
-}
-
-/// Update the initializer at index @p StructuredIndex within the
-/// structured initializer list to the value @p expr.
-void InitListChecker::UpdateStructuredListElement(InitListExpr *StructuredList,
-                                                  unsigned &StructuredIndex,
-                                                  Expr *expr) {
-  // No structured initializer list to update
-  if (!StructuredList)
-    return;
-
-  if (Expr *PrevInit = StructuredList->updateInit(SemaRef.Context,
-                                                  StructuredIndex, expr)) {
-    // This initializer overwrites a previous initializer. Warn.
-    // We need to check on source range validity because the previous
-    // initializer does not have to be an explicit initializer.
-    // struct P { int a, b; };
-    // struct PP { struct P p } l = { { .a = 2 }, .p.b = 3 };
-    // There is an overwrite taking place because the first braced initializer
-    // list "{ .a = 2 }' already provides value for .p.b (which is zero).
-    if (PrevInit->getSourceRange().isValid()) {
-      SemaRef.Diag(expr->getBeginLoc(), diag::warn_initializer_overrides)
-          << expr->getSourceRange();
-
-      SemaRef.Diag(PrevInit->getBeginLoc(), diag::note_previous_initializer)
-          << /*FIXME:has side effects=*/0 << PrevInit->getSourceRange();
-    }
-  }
-
-  ++StructuredIndex;
-}
-
-/// Check that the given Index expression is a valid array designator
-/// value. This is essentially just a wrapper around
-/// VerifyIntegerConstantExpression that also checks for negative values
-/// and produces a reasonable diagnostic if there is a
-/// failure. Returns the index expression, possibly with an implicit cast
-/// added, on success.  If everything went okay, Value will receive the
-/// value of the constant expression.
-static ExprResult
-CheckArrayDesignatorExpr(Sema &S, Expr *Index, llvm::APSInt &Value) {
-  SourceLocation Loc = Index->getBeginLoc();
-
-  // Make sure this is an integer constant expression.
-  ExprResult Result = S.VerifyIntegerConstantExpression(Index, &Value);
-  if (Result.isInvalid())
-    return Result;
-
-  if (Value.isSigned() && Value.isNegative())
-    return S.Diag(Loc, diag::err_array_designator_negative)
-      << Value.toString(10) << Index->getSourceRange();
-
-  Value.setIsUnsigned(true);
-  return Result;
-}
-
-ExprResult Sema::ActOnDesignatedInitializer(Designation &Desig,
-                                            SourceLocation Loc,
-                                            bool GNUSyntax,
-                                            ExprResult Init) {
-  typedef DesignatedInitExpr::Designator ASTDesignator;
-
-  bool Invalid = false;
-  SmallVector<ASTDesignator, 32> Designators;
-  SmallVector<Expr *, 32> InitExpressions;
-
-  // Build designators and check array designator expressions.
-  for (unsigned Idx = 0; Idx < Desig.getNumDesignators(); ++Idx) {
-    const Designator &D = Desig.getDesignator(Idx);
-    switch (D.getKind()) {
-    case Designator::FieldDesignator:
-      Designators.push_back(ASTDesignator(D.getField(), D.getDotLoc(),
-                                          D.getFieldLoc()));
-      break;
-
-    case Designator::ArrayDesignator: {
-      Expr *Index = static_cast<Expr *>(D.getArrayIndex());
-      llvm::APSInt IndexValue;
-      if (!Index->isTypeDependent() && !Index->isValueDependent())
-        Index = CheckArrayDesignatorExpr(*this, Index, IndexValue).get();
-      if (!Index)
-        Invalid = true;
-      else {
-        Designators.push_back(ASTDesignator(InitExpressions.size(),
-                                            D.getLBracketLoc(),
-                                            D.getRBracketLoc()));
-        InitExpressions.push_back(Index);
-      }
-      break;
-    }
-
-    case Designator::ArrayRangeDesignator: {
-      Expr *StartIndex = static_cast<Expr *>(D.getArrayRangeStart());
-      Expr *EndIndex = static_cast<Expr *>(D.getArrayRangeEnd());
-      llvm::APSInt StartValue;
-      llvm::APSInt EndValue;
-      bool StartDependent = StartIndex->isTypeDependent() ||
-                            StartIndex->isValueDependent();
-      bool EndDependent = EndIndex->isTypeDependent() ||
-                          EndIndex->isValueDependent();
-      if (!StartDependent)
-        StartIndex =
-            CheckArrayDesignatorExpr(*this, StartIndex, StartValue).get();
-      if (!EndDependent)
-        EndIndex = CheckArrayDesignatorExpr(*this, EndIndex, EndValue).get();
-
-      if (!StartIndex || !EndIndex)
-        Invalid = true;
-      else {
-        // Make sure we're comparing values with the same bit width.
-        if (StartDependent || EndDependent) {
-          // Nothing to compute.
-        } else if (StartValue.getBitWidth() > EndValue.getBitWidth())
-          EndValue = EndValue.extend(StartValue.getBitWidth());
-        else if (StartValue.getBitWidth() < EndValue.getBitWidth())
-          StartValue = StartValue.extend(EndValue.getBitWidth());
-
-        if (!StartDependent && !EndDependent && EndValue < StartValue) {
-          Diag(D.getEllipsisLoc(), diag::err_array_designator_empty_range)
-            << StartValue.toString(10) << EndValue.toString(10)
-            << StartIndex->getSourceRange() << EndIndex->getSourceRange();
-          Invalid = true;
-        } else {
-          Designators.push_back(ASTDesignator(InitExpressions.size(),
-                                              D.getLBracketLoc(),
-                                              D.getEllipsisLoc(),
-                                              D.getRBracketLoc()));
-          InitExpressions.push_back(StartIndex);
-          InitExpressions.push_back(EndIndex);
-        }
-      }
-      break;
-    }
-    }
-  }
-
-  if (Invalid || Init.isInvalid())
-    return ExprError();
-
-  // Clear out the expressions within the designation.
-  Desig.ClearExprs(*this);
-
-  DesignatedInitExpr *DIE
-    = DesignatedInitExpr::Create(Context,
-                                 Designators,
-                                 InitExpressions, Loc, GNUSyntax,
-                                 Init.getAs<Expr>());
-
-  if (!getLangOpts().C99)
-    Diag(DIE->getBeginLoc(), diag::ext_designated_init)
-        << DIE->getSourceRange();
-
-  return DIE;
-}
-
-//===----------------------------------------------------------------------===//
-// Initialization entity
-//===----------------------------------------------------------------------===//
-
-InitializedEntity::InitializedEntity(ASTContext &Context, unsigned Index,
-                                     const InitializedEntity &Parent)
-  : Parent(&Parent), Index(Index)
-{
-  if (const ArrayType *AT = Context.getAsArrayType(Parent.getType())) {
-    Kind = EK_ArrayElement;
-    Type = AT->getElementType();
-  } else if (const VectorType *VT = Parent.getType()->getAs<VectorType>()) {
-    Kind = EK_VectorElement;
-    Type = VT->getElementType();
-  } else {
-    const ComplexType *CT = Parent.getType()->getAs<ComplexType>();
-    assert(CT && "Unexpected type");
-    Kind = EK_ComplexElement;
-    Type = CT->getElementType();
-  }
-}
-
-InitializedEntity
-InitializedEntity::InitializeBase(ASTContext &Context,
-                                  const CXXBaseSpecifier *Base,
-                                  bool IsInheritedVirtualBase,
-                                  const InitializedEntity *Parent) {
-  InitializedEntity Result;
-  Result.Kind = EK_Base;
-  Result.Parent = Parent;
-  Result.Base = reinterpret_cast<uintptr_t>(Base);
-  if (IsInheritedVirtualBase)
-    Result.Base |= 0x01;
-
-  Result.Type = Base->getType();
-  return Result;
-}
-
-DeclarationName InitializedEntity::getName() const {
-  switch (getKind()) {
-  case EK_Parameter:
-  case EK_Parameter_CF_Audited: {
-    ParmVarDecl *D = reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1);
-    return (D ? D->getDeclName() : DeclarationName());
-  }
-
-  case EK_Variable:
-  case EK_Member:
-  case EK_Binding:
-    return Variable.VariableOrMember->getDeclName();
-
-  case EK_LambdaCapture:
-    return DeclarationName(Capture.VarID);
-
-  case EK_Result:
-  case EK_StmtExprResult:
-  case EK_Exception:
-  case EK_New:
-  case EK_Temporary:
-  case EK_Base:
-  case EK_Delegating:
-  case EK_ArrayElement:
-  case EK_VectorElement:
-  case EK_ComplexElement:
-  case EK_BlockElement:
-  case EK_LambdaToBlockConversionBlockElement:
-  case EK_CompoundLiteralInit:
-  case EK_RelatedResult:
-    return DeclarationName();
-  }
-
-  llvm_unreachable("Invalid EntityKind!");
-}
-
-ValueDecl *InitializedEntity::getDecl() const {
-  switch (getKind()) {
-  case EK_Variable:
-  case EK_Member:
-  case EK_Binding:
-    return Variable.VariableOrMember;
-
-  case EK_Parameter:
-  case EK_Parameter_CF_Audited:
-    return reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1);
-
-  case EK_Result:
-  case EK_StmtExprResult:
-  case EK_Exception:
-  case EK_New:
-  case EK_Temporary:
-  case EK_Base:
-  case EK_Delegating:
-  case EK_ArrayElement:
-  case EK_VectorElement:
-  case EK_ComplexElement:
-  case EK_BlockElement:
-  case EK_LambdaToBlockConversionBlockElement:
-  case EK_LambdaCapture:
-  case EK_CompoundLiteralInit:
-  case EK_RelatedResult:
-    return nullptr;
-  }
-
-  llvm_unreachable("Invalid EntityKind!");
-}
-
-bool InitializedEntity::allowsNRVO() const {
-  switch (getKind()) {
-  case EK_Result:
-  case EK_Exception:
-    return LocAndNRVO.NRVO;
-
-  case EK_StmtExprResult:
-  case EK_Variable:
-  case EK_Parameter:
-  case EK_Parameter_CF_Audited:
-  case EK_Member:
-  case EK_Binding:
-  case EK_New:
-  case EK_Temporary:
-  case EK_CompoundLiteralInit:
-  case EK_Base:
-  case EK_Delegating:
-  case EK_ArrayElement:
-  case EK_VectorElement:
-  case EK_ComplexElement:
-  case EK_BlockElement:
-  case EK_LambdaToBlockConversionBlockElement:
-  case EK_LambdaCapture:
-  case EK_RelatedResult:
-    break;
-  }
-
-  return false;
-}
-
-unsigned InitializedEntity::dumpImpl(raw_ostream &OS) const {
-  assert(getParent() != this);
-  unsigned Depth = getParent() ? getParent()->dumpImpl(OS) : 0;
-  for (unsigned I = 0; I != Depth; ++I)
-    OS << "`-";
-
-  switch (getKind()) {
-  case EK_Variable: OS << "Variable"; break;
-  case EK_Parameter: OS << "Parameter"; break;
-  case EK_Parameter_CF_Audited: OS << "CF audited function Parameter";
-    break;
-  case EK_Result: OS << "Result"; break;
-  case EK_StmtExprResult: OS << "StmtExprResult"; break;
-  case EK_Exception: OS << "Exception"; break;
-  case EK_Member: OS << "Member"; break;
-  case EK_Binding: OS << "Binding"; break;
-  case EK_New: OS << "New"; break;
-  case EK_Temporary: OS << "Temporary"; break;
-  case EK_CompoundLiteralInit: OS << "CompoundLiteral";break;
-  case EK_RelatedResult: OS << "RelatedResult"; break;
-  case EK_Base: OS << "Base"; break;
-  case EK_Delegating: OS << "Delegating"; break;
-  case EK_ArrayElement: OS << "ArrayElement " << Index; break;
-  case EK_VectorElement: OS << "VectorElement " << Index; break;
-  case EK_ComplexElement: OS << "ComplexElement " << Index; break;
-  case EK_BlockElement: OS << "Block"; break;
-  case EK_LambdaToBlockConversionBlockElement:
-    OS << "Block (lambda)";
-    break;
-  case EK_LambdaCapture:
-    OS << "LambdaCapture ";
-    OS << DeclarationName(Capture.VarID);
-    break;
-  }
-
-  if (auto *D = getDecl()) {
-    OS << " ";
-    D->printQualifiedName(OS);
-  }
-
-  OS << " '" << getType().getAsString() << "'\n";
-
-  return Depth + 1;
-}
-
-LLVM_DUMP_METHOD void InitializedEntity::dump() const {
-  dumpImpl(llvm::errs());
-}
-
-//===----------------------------------------------------------------------===//
-// Initialization sequence
-//===----------------------------------------------------------------------===//
-
-void InitializationSequence::Step::Destroy() {
-  switch (Kind) {
-  case SK_ResolveAddressOfOverloadedFunction:
-  case SK_CastDerivedToBaseRValue:
-  case SK_CastDerivedToBaseXValue:
-  case SK_CastDerivedToBaseLValue:
-  case SK_BindReference:
-  case SK_BindReferenceToTemporary:
-  case SK_FinalCopy:
-  case SK_ExtraneousCopyToTemporary:
-  case SK_UserConversion:
-  case SK_QualificationConversionRValue:
-  case SK_QualificationConversionXValue:
-  case SK_QualificationConversionLValue:
-  case SK_AtomicConversion:
-  case SK_LValueToRValue:
-  case SK_ListInitialization:
-  case SK_UnwrapInitList:
-  case SK_RewrapInitList:
-  case SK_ConstructorInitialization:
-  case SK_ConstructorInitializationFromList:
-  case SK_ZeroInitialization:
-  case SK_CAssignment:
-  case SK_StringInit:
-  case SK_ObjCObjectConversion:
-  case SK_ArrayLoopIndex:
-  case SK_ArrayLoopInit:
-  case SK_ArrayInit:
-  case SK_GNUArrayInit:
-  case SK_ParenthesizedArrayInit:
-  case SK_PassByIndirectCopyRestore:
-  case SK_PassByIndirectRestore:
-  case SK_ProduceObjCObject:
-  case SK_StdInitializerList:
-  case SK_StdInitializerListConstructorCall:
-  case SK_OCLSamplerInit:
-  case SK_OCLZeroOpaqueType:
-    break;
-
-  case SK_ConversionSequence:
-  case SK_ConversionSequenceNoNarrowing:
-    delete ICS;
-  }
-}
-
-bool InitializationSequence::isDirectReferenceBinding() const {
-  // There can be some lvalue adjustments after the SK_BindReference step.
-  for (auto I = Steps.rbegin(); I != Steps.rend(); ++I) {
-    if (I->Kind == SK_BindReference)
-      return true;
-    if (I->Kind == SK_BindReferenceToTemporary)
-      return false;
-  }
-  return false;
-}
-
-bool InitializationSequence::isAmbiguous() const {
-  if (!Failed())
-    return false;
-
-  switch (getFailureKind()) {
-  case FK_TooManyInitsForReference:
-  case FK_ParenthesizedListInitForReference:
-  case FK_ArrayNeedsInitList:
-  case FK_ArrayNeedsInitListOrStringLiteral:
-  case FK_ArrayNeedsInitListOrWideStringLiteral:
-  case FK_NarrowStringIntoWideCharArray:
-  case FK_WideStringIntoCharArray:
-  case FK_IncompatWideStringIntoWideChar:
-  case FK_PlainStringIntoUTF8Char:
-  case FK_UTF8StringIntoPlainChar:
-  case FK_AddressOfOverloadFailed: // FIXME: Could do better
-  case FK_NonConstLValueReferenceBindingToTemporary:
-  case FK_NonConstLValueReferenceBindingToBitfield:
-  case FK_NonConstLValueReferenceBindingToVectorElement:
-  case FK_NonConstLValueReferenceBindingToUnrelated:
-  case FK_RValueReferenceBindingToLValue:
-  case FK_ReferenceInitDropsQualifiers:
-  case FK_ReferenceInitFailed:
-  case FK_ConversionFailed:
-  case FK_ConversionFromPropertyFailed:
-  case FK_TooManyInitsForScalar:
-  case FK_ParenthesizedListInitForScalar:
-  case FK_ReferenceBindingToInitList:
-  case FK_InitListBadDestinationType:
-  case FK_DefaultInitOfConst:
-  case FK_Incomplete:
-  case FK_ArrayTypeMismatch:
-  case FK_NonConstantArrayInit:
-  case FK_ListInitializationFailed:
-  case FK_VariableLengthArrayHasInitializer:
-  case FK_PlaceholderType:
-  case FK_ExplicitConstructor:
-  case FK_AddressOfUnaddressableFunction:
-    return false;
-
-  case FK_ReferenceInitOverloadFailed:
-  case FK_UserConversionOverloadFailed:
-  case FK_ConstructorOverloadFailed:
-  case FK_ListConstructorOverloadFailed:
-    return FailedOverloadResult == OR_Ambiguous;
-  }
-
-  llvm_unreachable("Invalid EntityKind!");
-}
-
-bool InitializationSequence::isConstructorInitialization() const {
-  return !Steps.empty() && Steps.back().Kind == SK_ConstructorInitialization;
-}
-
-void
-InitializationSequence
-::AddAddressOverloadResolutionStep(FunctionDecl *Function,
-                                   DeclAccessPair Found,
-                                   bool HadMultipleCandidates) {
-  Step S;
-  S.Kind = SK_ResolveAddressOfOverloadedFunction;
-  S.Type = Function->getType();
-  S.Function.HadMultipleCandidates = HadMultipleCandidates;
-  S.Function.Function = Function;
-  S.Function.FoundDecl = Found;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddDerivedToBaseCastStep(QualType BaseType,
-                                                      ExprValueKind VK) {
-  Step S;
-  switch (VK) {
-  case VK_RValue: S.Kind = SK_CastDerivedToBaseRValue; break;
-  case VK_XValue: S.Kind = SK_CastDerivedToBaseXValue; break;
-  case VK_LValue: S.Kind = SK_CastDerivedToBaseLValue; break;
-  }
-  S.Type = BaseType;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddReferenceBindingStep(QualType T,
-                                                     bool BindingTemporary) {
-  Step S;
-  S.Kind = BindingTemporary? SK_BindReferenceToTemporary : SK_BindReference;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddFinalCopy(QualType T) {
-  Step S;
-  S.Kind = SK_FinalCopy;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddExtraneousCopyToTemporary(QualType T) {
-  Step S;
-  S.Kind = SK_ExtraneousCopyToTemporary;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void
-InitializationSequence::AddUserConversionStep(FunctionDecl *Function,
-                                              DeclAccessPair FoundDecl,
-                                              QualType T,
-                                              bool HadMultipleCandidates) {
-  Step S;
-  S.Kind = SK_UserConversion;
-  S.Type = T;
-  S.Function.HadMultipleCandidates = HadMultipleCandidates;
-  S.Function.Function = Function;
-  S.Function.FoundDecl = FoundDecl;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddQualificationConversionStep(QualType Ty,
-                                                            ExprValueKind VK) {
-  Step S;
-  S.Kind = SK_QualificationConversionRValue; // work around a gcc warning
-  switch (VK) {
-  case VK_RValue:
-    S.Kind = SK_QualificationConversionRValue;
-    break;
-  case VK_XValue:
-    S.Kind = SK_QualificationConversionXValue;
-    break;
-  case VK_LValue:
-    S.Kind = SK_QualificationConversionLValue;
-    break;
-  }
-  S.Type = Ty;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddAtomicConversionStep(QualType Ty) {
-  Step S;
-  S.Kind = SK_AtomicConversion;
-  S.Type = Ty;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddLValueToRValueStep(QualType Ty) {
-  assert(!Ty.hasQualifiers() && "rvalues may not have qualifiers");
-
-  Step S;
-  S.Kind = SK_LValueToRValue;
-  S.Type = Ty;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddConversionSequenceStep(
-    const ImplicitConversionSequence &ICS, QualType T,
-    bool TopLevelOfInitList) {
-  Step S;
-  S.Kind = TopLevelOfInitList ? SK_ConversionSequenceNoNarrowing
-                              : SK_ConversionSequence;
-  S.Type = T;
-  S.ICS = new ImplicitConversionSequence(ICS);
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddListInitializationStep(QualType T) {
-  Step S;
-  S.Kind = SK_ListInitialization;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddConstructorInitializationStep(
-    DeclAccessPair FoundDecl, CXXConstructorDecl *Constructor, QualType T,
-    bool HadMultipleCandidates, bool FromInitList, bool AsInitList) {
-  Step S;
-  S.Kind = FromInitList ? AsInitList ? SK_StdInitializerListConstructorCall
-                                     : SK_ConstructorInitializationFromList
-                        : SK_ConstructorInitialization;
-  S.Type = T;
-  S.Function.HadMultipleCandidates = HadMultipleCandidates;
-  S.Function.Function = Constructor;
-  S.Function.FoundDecl = FoundDecl;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddZeroInitializationStep(QualType T) {
-  Step S;
-  S.Kind = SK_ZeroInitialization;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddCAssignmentStep(QualType T) {
-  Step S;
-  S.Kind = SK_CAssignment;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddStringInitStep(QualType T) {
-  Step S;
-  S.Kind = SK_StringInit;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddObjCObjectConversionStep(QualType T) {
-  Step S;
-  S.Kind = SK_ObjCObjectConversion;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddArrayInitStep(QualType T, bool IsGNUExtension) {
-  Step S;
-  S.Kind = IsGNUExtension ? SK_GNUArrayInit : SK_ArrayInit;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddArrayInitLoopStep(QualType T, QualType EltT) {
-  Step S;
-  S.Kind = SK_ArrayLoopIndex;
-  S.Type = EltT;
-  Steps.insert(Steps.begin(), S);
-
-  S.Kind = SK_ArrayLoopInit;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddParenthesizedArrayInitStep(QualType T) {
-  Step S;
-  S.Kind = SK_ParenthesizedArrayInit;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddPassByIndirectCopyRestoreStep(QualType type,
-                                                              bool shouldCopy) {
-  Step s;
-  s.Kind = (shouldCopy ? SK_PassByIndirectCopyRestore
-                       : SK_PassByIndirectRestore);
-  s.Type = type;
-  Steps.push_back(s);
-}
-
-void InitializationSequence::AddProduceObjCObjectStep(QualType T) {
-  Step S;
-  S.Kind = SK_ProduceObjCObject;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddStdInitializerListConstructionStep(QualType T) {
-  Step S;
-  S.Kind = SK_StdInitializerList;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddOCLSamplerInitStep(QualType T) {
-  Step S;
-  S.Kind = SK_OCLSamplerInit;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::AddOCLZeroOpaqueTypeStep(QualType T) {
-  Step S;
-  S.Kind = SK_OCLZeroOpaqueType;
-  S.Type = T;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::RewrapReferenceInitList(QualType T,
-                                                     InitListExpr *Syntactic) {
-  assert(Syntactic->getNumInits() == 1 &&
-         "Can only rewrap trivial init lists.");
-  Step S;
-  S.Kind = SK_UnwrapInitList;
-  S.Type = Syntactic->getInit(0)->getType();
-  Steps.insert(Steps.begin(), S);
-
-  S.Kind = SK_RewrapInitList;
-  S.Type = T;
-  S.WrappingSyntacticList = Syntactic;
-  Steps.push_back(S);
-}
-
-void InitializationSequence::SetOverloadFailure(FailureKind Failure,
-                                                OverloadingResult Result) {
-  setSequenceKind(FailedSequence);
-  this->Failure = Failure;
-  this->FailedOverloadResult = Result;
-}
-
-//===----------------------------------------------------------------------===//
-// Attempt initialization
-//===----------------------------------------------------------------------===//
-
-/// Tries to add a zero initializer. Returns true if that worked.
-static bool
-maybeRecoverWithZeroInitialization(Sema &S, InitializationSequence &Sequence,
-                                   const InitializedEntity &Entity) {
-  if (Entity.getKind() != InitializedEntity::EK_Variable)
-    return false;
-
-  VarDecl *VD = cast<VarDecl>(Entity.getDecl());
-  if (VD->getInit() || VD->getEndLoc().isMacroID())
-    return false;
-
-  QualType VariableTy = VD->getType().getCanonicalType();
-  SourceLocation Loc = S.getLocForEndOfToken(VD->getEndLoc());
-  std::string Init = S.getFixItZeroInitializerForType(VariableTy, Loc);
-  if (!Init.empty()) {
-    Sequence.AddZeroInitializationStep(Entity.getType());
-    Sequence.SetZeroInitializationFixit(Init, Loc);
-    return true;
-  }
-  return false;
-}
-
-static void MaybeProduceObjCObject(Sema &S,
-                                   InitializationSequence &Sequence,
-                                   const InitializedEntity &Entity) {
-  if (!S.getLangOpts().ObjCAutoRefCount) return;
-
-  /// When initializing a parameter, produce the value if it's marked
-  /// __attribute__((ns_consumed)).
-  if (Entity.isParameterKind()) {
-    if (!Entity.isParameterConsumed())
-      return;
-
-    assert(Entity.getType()->isObjCRetainableType() &&
-           "consuming an object of unretainable type?");
-    Sequence.AddProduceObjCObjectStep(Entity.getType());
-
-  /// When initializing a return value, if the return type is a
-  /// retainable type, then returns need to immediately retain the
-  /// object.  If an autorelease is required, it will be done at the
-  /// last instant.
-  } else if (Entity.getKind() == InitializedEntity::EK_Result ||
-             Entity.getKind() == InitializedEntity::EK_StmtExprResult) {
-    if (!Entity.getType()->isObjCRetainableType())
-      return;
-
-    Sequence.AddProduceObjCObjectStep(Entity.getType());
-  }
-}
-
-static void TryListInitialization(Sema &S,
-                                  const InitializedEntity &Entity,
-                                  const InitializationKind &Kind,
-                                  InitListExpr *InitList,
-                                  InitializationSequence &Sequence,
-                                  bool TreatUnavailableAsInvalid);
-
-/// When initializing from init list via constructor, handle
-/// initialization of an object of type std::initializer_list<T>.
-///
-/// \return true if we have handled initialization of an object of type
-/// std::initializer_list<T>, false otherwise.
-static bool TryInitializerListConstruction(Sema &S,
-                                           InitListExpr *List,
-                                           QualType DestType,
-                                           InitializationSequence &Sequence,
-                                           bool TreatUnavailableAsInvalid) {
-  QualType E;
-  if (!S.isStdInitializerList(DestType, &E))
-    return false;
-
-  if (!S.isCompleteType(List->getExprLoc(), E)) {
-    Sequence.setIncompleteTypeFailure(E);
-    return true;
-  }
-
-  // Try initializing a temporary array from the init list.
-  QualType ArrayType = S.Context.getConstantArrayType(
-      E.withConst(), llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
-                                 List->getNumInits()),
-      clang::ArrayType::Normal, 0);
-  InitializedEntity HiddenArray =
-      InitializedEntity::InitializeTemporary(ArrayType);
-  InitializationKind Kind = InitializationKind::CreateDirectList(
-      List->getExprLoc(), List->getBeginLoc(), List->getEndLoc());
-  TryListInitialization(S, HiddenArray, Kind, List, Sequence,
-                        TreatUnavailableAsInvalid);
-  if (Sequence)
-    Sequence.AddStdInitializerListConstructionStep(DestType);
-  return true;
-}
-
-/// Determine if the constructor has the signature of a copy or move
-/// constructor for the type T of the class in which it was found. That is,
-/// determine if its first parameter is of type T or reference to (possibly
-/// cv-qualified) T.
-static bool hasCopyOrMoveCtorParam(ASTContext &Ctx,
-                                   const ConstructorInfo &Info) {
-  if (Info.Constructor->getNumParams() == 0)
-    return false;
-
-  QualType ParmT =
-      Info.Constructor->getParamDecl(0)->getType().getNonReferenceType();
-  QualType ClassT =
-      Ctx.getRecordType(cast<CXXRecordDecl>(Info.FoundDecl->getDeclContext()));
-
-  return Ctx.hasSameUnqualifiedType(ParmT, ClassT);
-}
-
-static OverloadingResult
-ResolveConstructorOverload(Sema &S, SourceLocation DeclLoc,
-                           MultiExprArg Args,
-                           OverloadCandidateSet &CandidateSet,
-                           QualType DestType,
-                           DeclContext::lookup_result Ctors,
-                           OverloadCandidateSet::iterator &Best,
-                           bool CopyInitializing, bool AllowExplicit,
-                           bool OnlyListConstructors, bool IsListInit,
-                           bool SecondStepOfCopyInit = false) {
-  CandidateSet.clear(OverloadCandidateSet::CSK_InitByConstructor);
-
-  for (NamedDecl *D : Ctors) {
-    auto Info = getConstructorInfo(D);
-    if (!Info.Constructor || Info.Constructor->isInvalidDecl())
-      continue;
-
-    if (!AllowExplicit && Info.Constructor->isExplicit())
-      continue;
-
-    if (OnlyListConstructors && !S.isInitListConstructor(Info.Constructor))
-      continue;
-
-    // C++11 [over.best.ics]p4:
-    //   ... and the constructor or user-defined conversion function is a
-    //   candidate by
-    //   - 13.3.1.3, when the argument is the temporary in the second step
-    //     of a class copy-initialization, or
-    //   - 13.3.1.4, 13.3.1.5, or 13.3.1.6 (in all cases), [not handled here]
-    //   - the second phase of 13.3.1.7 when the initializer list has exactly
-    //     one element that is itself an initializer list, and the target is
-    //     the first parameter of a constructor of class X, and the conversion
-    //     is to X or reference to (possibly cv-qualified X),
-    //   user-defined conversion sequences are not considered.
-    bool SuppressUserConversions =
-        SecondStepOfCopyInit ||
-        (IsListInit && Args.size() == 1 && isa<InitListExpr>(Args[0]) &&
-         hasCopyOrMoveCtorParam(S.Context, Info));
-
-    if (Info.ConstructorTmpl)
-      S.AddTemplateOverloadCandidate(Info.ConstructorTmpl, Info.FoundDecl,
-                                     /*ExplicitArgs*/ nullptr, Args,
-                                     CandidateSet, SuppressUserConversions);
-    else {
-      // C++ [over.match.copy]p1:
-      //   - When initializing a temporary to be bound to the first parameter
-      //     of a constructor [for type T] that takes a reference to possibly
-      //     cv-qualified T as its first argument, called with a single
-      //     argument in the context of direct-initialization, explicit
-      //     conversion functions are also considered.
-      // FIXME: What if a constructor template instantiates to such a signature?
-      bool AllowExplicitConv = AllowExplicit && !CopyInitializing &&
-                               Args.size() == 1 &&
-                               hasCopyOrMoveCtorParam(S.Context, Info);
-      S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl, Args,
-                             CandidateSet, SuppressUserConversions,
-                             /*PartialOverloading=*/false,
-                             /*AllowExplicit=*/AllowExplicitConv);
-    }
-  }
-
-  // FIXME: Work around a bug in C++17 guaranteed copy elision.
-  //
-  // When initializing an object of class type T by constructor
-  // ([over.match.ctor]) or by list-initialization ([over.match.list])
-  // from a single expression of class type U, conversion functions of
-  // U that convert to the non-reference type cv T are candidates.
-  // Explicit conversion functions are only candidates during
-  // direct-initialization.
-  //
-  // Note: SecondStepOfCopyInit is only ever true in this case when
-  // evaluating whether to produce a C++98 compatibility warning.
-  if (S.getLangOpts().CPlusPlus17 && Args.size() == 1 &&
-      !SecondStepOfCopyInit) {
-    Expr *Initializer = Args[0];
-    auto *SourceRD = Initializer->getType()->getAsCXXRecordDecl();
-    if (SourceRD && S.isCompleteType(DeclLoc, Initializer->getType())) {
-      const auto &Conversions = SourceRD->getVisibleConversionFunctions();
-      for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
-        NamedDecl *D = *I;
-        CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
-        D = D->getUnderlyingDecl();
-
-        FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
-        CXXConversionDecl *Conv;
-        if (ConvTemplate)
-          Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
-        else
-          Conv = cast<CXXConversionDecl>(D);
-
-        if ((AllowExplicit && !CopyInitializing) || !Conv->isExplicit()) {
-          if (ConvTemplate)
-            S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(),
-                                             ActingDC, Initializer, DestType,
-                                             CandidateSet, AllowExplicit,
-                                             /*AllowResultConversion*/false);
-          else
-            S.AddConversionCandidate(Conv, I.getPair(), ActingDC, Initializer,
-                                     DestType, CandidateSet, AllowExplicit,
-                                     /*AllowResultConversion*/false);
-        }
-      }
-    }
-  }
-
-  // Perform overload resolution and return the result.
-  return CandidateSet.BestViableFunction(S, DeclLoc, Best);
-}
-
-/// Attempt initialization by constructor (C++ [dcl.init]), which
-/// enumerates the constructors of the initialized entity and performs overload
-/// resolution to select the best.
-/// \param DestType       The destination class type.
-/// \param DestArrayType  The destination type, which is either DestType or
-///                       a (possibly multidimensional) array of DestType.
-/// \param IsListInit     Is this list-initialization?
-/// \param IsInitListCopy Is this non-list-initialization resulting from a
-///                       list-initialization from {x} where x is the same
-///                       type as the entity?
-static void TryConstructorInitialization(Sema &S,
-                                         const InitializedEntity &Entity,
-                                         const InitializationKind &Kind,
-                                         MultiExprArg Args, QualType DestType,
-                                         QualType DestArrayType,
-                                         InitializationSequence &Sequence,
-                                         bool IsListInit = false,
-                                         bool IsInitListCopy = false) {
-  assert(((!IsListInit && !IsInitListCopy) ||
-          (Args.size() == 1 && isa<InitListExpr>(Args[0]))) &&
-         "IsListInit/IsInitListCopy must come with a single initializer list "
-         "argument.");
-  InitListExpr *ILE =
-      (IsListInit || IsInitListCopy) ? cast<InitListExpr>(Args[0]) : nullptr;
-  MultiExprArg UnwrappedArgs =
-      ILE ? MultiExprArg(ILE->getInits(), ILE->getNumInits()) : Args;
-
-  // The type we're constructing needs to be complete.
-  if (!S.isCompleteType(Kind.getLocation(), DestType)) {
-    Sequence.setIncompleteTypeFailure(DestType);
-    return;
-  }
-
-  // C++17 [dcl.init]p17:
-  //     - If the initializer expression is a prvalue and the cv-unqualified
-  //       version of the source type is the same class as the class of the
-  //       destination, the initializer expression is used to initialize the
-  //       destination object.
-  // Per DR (no number yet), this does not apply when initializing a base
-  // class or delegating to another constructor from a mem-initializer.
-  // ObjC++: Lambda captured by the block in the lambda to block conversion
-  // should avoid copy elision.
-  if (S.getLangOpts().CPlusPlus17 &&
-      Entity.getKind() != InitializedEntity::EK_Base &&
-      Entity.getKind() != InitializedEntity::EK_Delegating &&
-      Entity.getKind() !=
-          InitializedEntity::EK_LambdaToBlockConversionBlockElement &&
-      UnwrappedArgs.size() == 1 && UnwrappedArgs[0]->isRValue() &&
-      S.Context.hasSameUnqualifiedType(UnwrappedArgs[0]->getType(), DestType)) {
-    // Convert qualifications if necessary.
-    Sequence.AddQualificationConversionStep(DestType, VK_RValue);
-    if (ILE)
-      Sequence.RewrapReferenceInitList(DestType, ILE);
-    return;
-  }
-
-  const RecordType *DestRecordType = DestType->getAs<RecordType>();
-  assert(DestRecordType && "Constructor initialization requires record type");
-  CXXRecordDecl *DestRecordDecl
-    = cast<CXXRecordDecl>(DestRecordType->getDecl());
-
-  // Build the candidate set directly in the initialization sequence
-  // structure, so that it will persist if we fail.
-  OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
-
-  // Determine whether we are allowed to call explicit constructors or
-  // explicit conversion operators.
-  bool AllowExplicit = Kind.AllowExplicit() || IsListInit;
-  bool CopyInitialization = Kind.getKind() == InitializationKind::IK_Copy;
-
-  //   - Otherwise, if T is a class type, constructors are considered. The
-  //     applicable constructors are enumerated, and the best one is chosen
-  //     through overload resolution.
-  DeclContext::lookup_result Ctors = S.LookupConstructors(DestRecordDecl);
-
-  OverloadingResult Result = OR_No_Viable_Function;
-  OverloadCandidateSet::iterator Best;
-  bool AsInitializerList = false;
-
-  // C++11 [over.match.list]p1, per DR1467:
-  //   When objects of non-aggregate type T are list-initialized, such that
-  //   8.5.4 [dcl.init.list] specifies that overload resolution is performed
-  //   according to the rules in this section, overload resolution selects
-  //   the constructor in two phases:
-  //
-  //   - Initially, the candidate functions are the initializer-list
-  //     constructors of the class T and the argument list consists of the
-  //     initializer list as a single argument.
-  if (IsListInit) {
-    AsInitializerList = true;
-
-    // If the initializer list has no elements and T has a default constructor,
-    // the first phase is omitted.
-    if (!(UnwrappedArgs.empty() && DestRecordDecl->hasDefaultConstructor()))
-      Result = ResolveConstructorOverload(S, Kind.getLocation(), Args,
-                                          CandidateSet, DestType, Ctors, Best,
-                                          CopyInitialization, AllowExplicit,
-                                          /*OnlyListConstructor=*/true,
-                                          IsListInit);
-  }
-
-  // C++11 [over.match.list]p1:
-  //   - If no viable initializer-list constructor is found, overload resolution
-  //     is performed again, where the candidate functions are all the
-  //     constructors of the class T and the argument list consists of the
-  //     elements of the initializer list.
-  if (Result == OR_No_Viable_Function) {
-    AsInitializerList = false;
-    Result = ResolveConstructorOverload(S, Kind.getLocation(), UnwrappedArgs,
-                                        CandidateSet, DestType, Ctors, Best,
-                                        CopyInitialization, AllowExplicit,
-                                        /*OnlyListConstructors=*/false,
-                                        IsListInit);
-  }
-  if (Result) {
-    Sequence.SetOverloadFailure(IsListInit ?
-                      InitializationSequence::FK_ListConstructorOverloadFailed :
-                      InitializationSequence::FK_ConstructorOverloadFailed,
-                                Result);
-    return;
-  }
-
-  bool HadMultipleCandidates = (CandidateSet.size() > 1);
-
-  // In C++17, ResolveConstructorOverload can select a conversion function
-  // instead of a constructor.
-  if (auto *CD = dyn_cast<CXXConversionDecl>(Best->Function)) {
-    // Add the user-defined conversion step that calls the conversion function.
-    QualType ConvType = CD->getConversionType();
-    assert(S.Context.hasSameUnqualifiedType(ConvType, DestType) &&
-           "should not have selected this conversion function");
-    Sequence.AddUserConversionStep(CD, Best->FoundDecl, ConvType,
-                                   HadMultipleCandidates);
-    if (!S.Context.hasSameType(ConvType, DestType))
-      Sequence.AddQualificationConversionStep(DestType, VK_RValue);
-    if (IsListInit)
-      Sequence.RewrapReferenceInitList(Entity.getType(), ILE);
-    return;
-  }
-
-  // C++11 [dcl.init]p6:
-  //   If a program calls for the default initialization of an object
-  //   of a const-qualified type T, T shall be a class type with a
-  //   user-provided default constructor.
-  // C++ core issue 253 proposal:
-  //   If the implicit default constructor initializes all subobjects, no
-  //   initializer should be required.
-  // The 253 proposal is for example needed to process libstdc++ headers in 5.x.
-  CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
-  if (Kind.getKind() == InitializationKind::IK_Default &&
-      Entity.getType().isConstQualified()) {
-    if (!CtorDecl->getParent()->allowConstDefaultInit()) {
-      if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity))
-        Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
-      return;
-    }
-  }
-
-  // C++11 [over.match.list]p1:
-  //   In copy-list-initialization, if an explicit constructor is chosen, the
-  //   initializer is ill-formed.
-  if (IsListInit && !Kind.AllowExplicit() && CtorDecl->isExplicit()) {
-    Sequence.SetFailed(InitializationSequence::FK_ExplicitConstructor);
-    return;
-  }
-
-  // Add the constructor initialization step. Any cv-qualification conversion is
-  // subsumed by the initialization.
-  Sequence.AddConstructorInitializationStep(
-      Best->FoundDecl, CtorDecl, DestArrayType, HadMultipleCandidates,
-      IsListInit | IsInitListCopy, AsInitializerList);
-}
-
-static bool
-ResolveOverloadedFunctionForReferenceBinding(Sema &S,
-                                             Expr *Initializer,
-                                             QualType &SourceType,
-                                             QualType &UnqualifiedSourceType,
-                                             QualType UnqualifiedTargetType,
-                                             InitializationSequence &Sequence) {
-  if (S.Context.getCanonicalType(UnqualifiedSourceType) ==
-        S.Context.OverloadTy) {
-    DeclAccessPair Found;
-    bool HadMultipleCandidates = false;
-    if (FunctionDecl *Fn
-        = S.ResolveAddressOfOverloadedFunction(Initializer,
-                                               UnqualifiedTargetType,
-                                               false, Found,
-                                               &HadMultipleCandidates)) {
-      Sequence.AddAddressOverloadResolutionStep(Fn, Found,
-                                                HadMultipleCandidates);
-      SourceType = Fn->getType();
-      UnqualifiedSourceType = SourceType.getUnqualifiedType();
-    } else if (!UnqualifiedTargetType->isRecordType()) {
-      Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
-      return true;
-    }
-  }
-  return false;
-}
-
-static void TryReferenceInitializationCore(Sema &S,
-                                           const InitializedEntity &Entity,
-                                           const InitializationKind &Kind,
-                                           Expr *Initializer,
-                                           QualType cv1T1, QualType T1,
-                                           Qualifiers T1Quals,
-                                           QualType cv2T2, QualType T2,
-                                           Qualifiers T2Quals,
-                                           InitializationSequence &Sequence);
-
-static void TryValueInitialization(Sema &S,
-                                   const InitializedEntity &Entity,
-                                   const InitializationKind &Kind,
-                                   InitializationSequence &Sequence,
-                                   InitListExpr *InitList = nullptr);
-
-/// Attempt list initialization of a reference.
-static void TryReferenceListInitialization(Sema &S,
-                                           const InitializedEntity &Entity,
-                                           const InitializationKind &Kind,
-                                           InitListExpr *InitList,
-                                           InitializationSequence &Sequence,
-                                           bool TreatUnavailableAsInvalid) {
-  // First, catch C++03 where this isn't possible.
-  if (!S.getLangOpts().CPlusPlus11) {
-    Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
-    return;
-  }
-  // Can't reference initialize a compound literal.
-  if (Entity.getKind() == InitializedEntity::EK_CompoundLiteralInit) {
-    Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
-    return;
-  }
-
-  QualType DestType = Entity.getType();
-  QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
-  Qualifiers T1Quals;
-  QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
-
-  // Reference initialization via an initializer list works thus:
-  // If the initializer list consists of a single element that is
-  // reference-related to the referenced type, bind directly to that element
-  // (possibly creating temporaries).
-  // Otherwise, initialize a temporary with the initializer list and
-  // bind to that.
-  if (InitList->getNumInits() == 1) {
-    Expr *Initializer = InitList->getInit(0);
-    QualType cv2T2 = Initializer->getType();
-    Qualifiers T2Quals;
-    QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
-
-    // If this fails, creating a temporary wouldn't work either.
-    if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
-                                                     T1, Sequence))
-      return;
-
-    SourceLocation DeclLoc = Initializer->getBeginLoc();
-    bool dummy1, dummy2, dummy3;
-    Sema::ReferenceCompareResult RefRelationship
-      = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, dummy1,
-                                       dummy2, dummy3);
-    if (RefRelationship >= Sema::Ref_Related) {
-      // Try to bind the reference here.
-      TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
-                                     T1Quals, cv2T2, T2, T2Quals, Sequence);
-      if (Sequence)
-        Sequence.RewrapReferenceInitList(cv1T1, InitList);
-      return;
-    }
-
-    // Update the initializer if we've resolved an overloaded function.
-    if (Sequence.step_begin() != Sequence.step_end())
-      Sequence.RewrapReferenceInitList(cv1T1, InitList);
-  }
-
-  // Not reference-related. Create a temporary and bind to that.
-  InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(cv1T1);
-
-  TryListInitialization(S, TempEntity, Kind, InitList, Sequence,
-                        TreatUnavailableAsInvalid);
-  if (Sequence) {
-    if (DestType->isRValueReferenceType() ||
-        (T1Quals.hasConst() && !T1Quals.hasVolatile()))
-      Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true);
-    else
-      Sequence.SetFailed(
-          InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
-  }
-}
-
-/// Attempt list initialization (C++0x [dcl.init.list])
-static void TryListInitialization(Sema &S,
-                                  const InitializedEntity &Entity,
-                                  const InitializationKind &Kind,
-                                  InitListExpr *InitList,
-                                  InitializationSequence &Sequence,
-                                  bool TreatUnavailableAsInvalid) {
-  QualType DestType = Entity.getType();
-
-  // C++ doesn't allow scalar initialization with more than one argument.
-  // But C99 complex numbers are scalars and it makes sense there.
-  if (S.getLangOpts().CPlusPlus && DestType->isScalarType() &&
-      !DestType->isAnyComplexType() && InitList->getNumInits() > 1) {
-    Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForScalar);
-    return;
-  }
-  if (DestType->isReferenceType()) {
-    TryReferenceListInitialization(S, Entity, Kind, InitList, Sequence,
-                                   TreatUnavailableAsInvalid);
-    return;
-  }
-
-  if (DestType->isRecordType() &&
-      !S.isCompleteType(InitList->getBeginLoc(), DestType)) {
-    Sequence.setIncompleteTypeFailure(DestType);
-    return;
-  }
-
-  // C++11 [dcl.init.list]p3, per DR1467:
-  // - If T is a class type and the initializer list has a single element of
-  //   type cv U, where U is T or a class derived from T, the object is
-  //   initialized from that element (by copy-initialization for
-  //   copy-list-initialization, or by direct-initialization for
-  //   direct-list-initialization).
-  // - Otherwise, if T is a character array and the initializer list has a
-  //   single element that is an appropriately-typed string literal
-  //   (8.5.2 [dcl.init.string]), initialization is performed as described
-  //   in that section.
-  // - Otherwise, if T is an aggregate, [...] (continue below).
-  if (S.getLangOpts().CPlusPlus11 && InitList->getNumInits() == 1) {
-    if (DestType->isRecordType()) {
-      QualType InitType = InitList->getInit(0)->getType();
-      if (S.Context.hasSameUnqualifiedType(InitType, DestType) ||
-          S.IsDerivedFrom(InitList->getBeginLoc(), InitType, DestType)) {
-        Expr *InitListAsExpr = InitList;
-        TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
-                                     DestType, Sequence,
-                                     /*InitListSyntax*/false,
-                                     /*IsInitListCopy*/true);
-        return;
-      }
-    }
-    if (const ArrayType *DestAT = S.Context.getAsArrayType(DestType)) {
-      Expr *SubInit[1] = {InitList->getInit(0)};
-      if (!isa<VariableArrayType>(DestAT) &&
-          IsStringInit(SubInit[0], DestAT, S.Context) == SIF_None) {
-        InitializationKind SubKind =
-            Kind.getKind() == InitializationKind::IK_DirectList
-                ? InitializationKind::CreateDirect(Kind.getLocation(),
-                                                   InitList->getLBraceLoc(),
-                                                   InitList->getRBraceLoc())
-                : Kind;
-        Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
-                                /*TopLevelOfInitList*/ true,
-                                TreatUnavailableAsInvalid);
-
-        // TryStringLiteralInitialization() (in InitializeFrom()) will fail if
-        // the element is not an appropriately-typed string literal, in which
-        // case we should proceed as in C++11 (below).
-        if (Sequence) {
-          Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
-          return;
-        }
-      }
-    }
-  }
-
-  // C++11 [dcl.init.list]p3:
-  //   - If T is an aggregate, aggregate initialization is performed.
-  if ((DestType->isRecordType() && !DestType->isAggregateType()) ||
-      (S.getLangOpts().CPlusPlus11 &&
-       S.isStdInitializerList(DestType, nullptr))) {
-    if (S.getLangOpts().CPlusPlus11) {
-      //   - Otherwise, if the initializer list has no elements and T is a
-      //     class type with a default constructor, the object is
-      //     value-initialized.
-      if (InitList->getNumInits() == 0) {
-        CXXRecordDecl *RD = DestType->getAsCXXRecordDecl();
-        if (RD->hasDefaultConstructor()) {
-          TryValueInitialization(S, Entity, Kind, Sequence, InitList);
-          return;
-        }
-      }
-
-      //   - Otherwise, if T is a specialization of std::initializer_list<E>,
-      //     an initializer_list object constructed [...]
-      if (TryInitializerListConstruction(S, InitList, DestType, Sequence,
-                                         TreatUnavailableAsInvalid))
-        return;
-
-      //   - Otherwise, if T is a class type, constructors are considered.
-      Expr *InitListAsExpr = InitList;
-      TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
-                                   DestType, Sequence, /*InitListSyntax*/true);
-    } else
-      Sequence.SetFailed(InitializationSequence::FK_InitListBadDestinationType);
-    return;
-  }
-
-  if (S.getLangOpts().CPlusPlus && !DestType->isAggregateType() &&
-      InitList->getNumInits() == 1) {
-    Expr *E = InitList->getInit(0);
-
-    //   - Otherwise, if T is an enumeration with a fixed underlying type,
-    //     the initializer-list has a single element v, and the initialization
-    //     is direct-list-initialization, the object is initialized with the
-    //     value T(v); if a narrowing conversion is required to convert v to
-    //     the underlying type of T, the program is ill-formed.
-    auto *ET = DestType->getAs<EnumType>();
-    if (S.getLangOpts().CPlusPlus17 &&
-        Kind.getKind() == InitializationKind::IK_DirectList &&
-        ET && ET->getDecl()->isFixed() &&
-        !S.Context.hasSameUnqualifiedType(E->getType(), DestType) &&
-        (E->getType()->isIntegralOrEnumerationType() ||
-         E->getType()->isFloatingType())) {
-      // There are two ways that T(v) can work when T is an enumeration type.
-      // If there is either an implicit conversion sequence from v to T or
-      // a conversion function that can convert from v to T, then we use that.
-      // Otherwise, if v is of integral, enumeration, or floating-point type,
-      // it is converted to the enumeration type via its underlying type.
-      // There is no overlap possible between these two cases (except when the
-      // source value is already of the destination type), and the first
-      // case is handled by the general case for single-element lists below.
-      ImplicitConversionSequence ICS;
-      ICS.setStandard();
-      ICS.Standard.setAsIdentityConversion();
-      if (!E->isRValue())
-        ICS.Standard.First = ICK_Lvalue_To_Rvalue;
-      // If E is of a floating-point type, then the conversion is ill-formed
-      // due to narrowing, but go through the motions in order to produce the
-      // right diagnostic.
-      ICS.Standard.Second = E->getType()->isFloatingType()
-                                ? ICK_Floating_Integral
-                                : ICK_Integral_Conversion;
-      ICS.Standard.setFromType(E->getType());
-      ICS.Standard.setToType(0, E->getType());
-      ICS.Standard.setToType(1, DestType);
-      ICS.Standard.setToType(2, DestType);
-      Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2),
-                                         /*TopLevelOfInitList*/true);
-      Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
-      return;
-    }
-
-    //   - Otherwise, if the initializer list has a single element of type E
-    //     [...references are handled above...], the object or reference is
-    //     initialized from that element (by copy-initialization for
-    //     copy-list-initialization, or by direct-initialization for
-    //     direct-list-initialization); if a narrowing conversion is required
-    //     to convert the element to T, the program is ill-formed.
-    //
-    // Per core-24034, this is direct-initialization if we were performing
-    // direct-list-initialization and copy-initialization otherwise.
-    // We can't use InitListChecker for this, because it always performs
-    // copy-initialization. This only matters if we might use an 'explicit'
-    // conversion operator, so we only need to handle the cases where the source
-    // is of record type.
-    if (InitList->getInit(0)->getType()->isRecordType()) {
-      InitializationKind SubKind =
-          Kind.getKind() == InitializationKind::IK_DirectList
-              ? InitializationKind::CreateDirect(Kind.getLocation(),
-                                                 InitList->getLBraceLoc(),
-                                                 InitList->getRBraceLoc())
-              : Kind;
-      Expr *SubInit[1] = { InitList->getInit(0) };
-      Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
-                              /*TopLevelOfInitList*/true,
-                              TreatUnavailableAsInvalid);
-      if (Sequence)
-        Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
-      return;
-    }
-  }
-
-  InitListChecker CheckInitList(S, Entity, InitList,
-          DestType, /*VerifyOnly=*/true, TreatUnavailableAsInvalid);
-  if (CheckInitList.HadError()) {
-    Sequence.SetFailed(InitializationSequence::FK_ListInitializationFailed);
-    return;
-  }
-
-  // Add the list initialization step with the built init list.
-  Sequence.AddListInitializationStep(DestType);
-}
-
-/// Try a reference initialization that involves calling a conversion
-/// function.
-static OverloadingResult TryRefInitWithConversionFunction(
-    Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind,
-    Expr *Initializer, bool AllowRValues, bool IsLValueRef,
-    InitializationSequence &Sequence) {
-  QualType DestType = Entity.getType();
-  QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
-  QualType T1 = cv1T1.getUnqualifiedType();
-  QualType cv2T2 = Initializer->getType();
-  QualType T2 = cv2T2.getUnqualifiedType();
-
-  bool DerivedToBase;
-  bool ObjCConversion;
-  bool ObjCLifetimeConversion;
-  assert(!S.CompareReferenceRelationship(Initializer->getBeginLoc(), T1, T2,
-                                         DerivedToBase, ObjCConversion,
-                                         ObjCLifetimeConversion) &&
-         "Must have incompatible references when binding via conversion");
-  (void)DerivedToBase;
-  (void)ObjCConversion;
-  (void)ObjCLifetimeConversion;
-
-  // Build the candidate set directly in the initialization sequence
-  // structure, so that it will persist if we fail.
-  OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
-  CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion);
-
-  // Determine whether we are allowed to call explicit conversion operators.
-  // Note that none of [over.match.copy], [over.match.conv], nor
-  // [over.match.ref] permit an explicit constructor to be chosen when
-  // initializing a reference, not even for direct-initialization.
-  bool AllowExplicitCtors = false;
-  bool AllowExplicitConvs = Kind.allowExplicitConversionFunctionsInRefBinding();
-
-  const RecordType *T1RecordType = nullptr;
-  if (AllowRValues && (T1RecordType = T1->getAs<RecordType>()) &&
-      S.isCompleteType(Kind.getLocation(), T1)) {
-    // The type we're converting to is a class type. Enumerate its constructors
-    // to see if there is a suitable conversion.
-    CXXRecordDecl *T1RecordDecl = cast<CXXRecordDecl>(T1RecordType->getDecl());
-
-    for (NamedDecl *D : S.LookupConstructors(T1RecordDecl)) {
-      auto Info = getConstructorInfo(D);
-      if (!Info.Constructor)
-        continue;
-
-      if (!Info.Constructor->isInvalidDecl() &&
-          Info.Constructor->isConvertingConstructor(AllowExplicitCtors)) {
-        if (Info.ConstructorTmpl)
-          S.AddTemplateOverloadCandidate(Info.ConstructorTmpl, Info.FoundDecl,
-                                         /*ExplicitArgs*/ nullptr,
-                                         Initializer, CandidateSet,
-                                         /*SuppressUserConversions=*/true);
-        else
-          S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl,
-                                 Initializer, CandidateSet,
-                                 /*SuppressUserConversions=*/true);
-      }
-    }
-  }
-  if (T1RecordType && T1RecordType->getDecl()->isInvalidDecl())
-    return OR_No_Viable_Function;
-
-  const RecordType *T2RecordType = nullptr;
-  if ((T2RecordType = T2->getAs<RecordType>()) &&
-      S.isCompleteType(Kind.getLocation(), T2)) {
-    // The type we're converting from is a class type, enumerate its conversion
-    // functions.
-    CXXRecordDecl *T2RecordDecl = cast<CXXRecordDecl>(T2RecordType->getDecl());
-
-    const auto &Conversions = T2RecordDecl->getVisibleConversionFunctions();
-    for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
-      NamedDecl *D = *I;
-      CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
-      if (isa<UsingShadowDecl>(D))
-        D = cast<UsingShadowDecl>(D)->getTargetDecl();
-
-      FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
-      CXXConversionDecl *Conv;
-      if (ConvTemplate)
-        Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
-      else
-        Conv = cast<CXXConversionDecl>(D);
-
-      // If the conversion function doesn't return a reference type,
-      // it can't be considered for this conversion unless we're allowed to
-      // consider rvalues.
-      // FIXME: Do we need to make sure that we only consider conversion
-      // candidates with reference-compatible results? That might be needed to
-      // break recursion.
-      if ((AllowExplicitConvs || !Conv->isExplicit()) &&
-          (AllowRValues || Conv->getConversionType()->isLValueReferenceType())){
-        if (ConvTemplate)
-          S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(),
-                                           ActingDC, Initializer,
-                                           DestType, CandidateSet,
-                                           /*AllowObjCConversionOnExplicit=*/
-                                             false);
-        else
-          S.AddConversionCandidate(Conv, I.getPair(), ActingDC,
-                                   Initializer, DestType, CandidateSet,
-                                   /*AllowObjCConversionOnExplicit=*/false);
-      }
-    }
-  }
-  if (T2RecordType && T2RecordType->getDecl()->isInvalidDecl())
-    return OR_No_Viable_Function;
-
-  SourceLocation DeclLoc = Initializer->getBeginLoc();
-
-  // Perform overload resolution. If it fails, return the failed result.
-  OverloadCandidateSet::iterator Best;
-  if (OverloadingResult Result
-        = CandidateSet.BestViableFunction(S, DeclLoc, Best))
-    return Result;
-
-  FunctionDecl *Function = Best->Function;
-  // This is the overload that will be used for this initialization step if we
-  // use this initialization. Mark it as referenced.
-  Function->setReferenced();
-
-  // Compute the returned type and value kind of the conversion.
-  QualType cv3T3;
-  if (isa<CXXConversionDecl>(Function))
-    cv3T3 = Function->getReturnType();
-  else
-    cv3T3 = T1;
-
-  ExprValueKind VK = VK_RValue;
-  if (cv3T3->isLValueReferenceType())
-    VK = VK_LValue;
-  else if (const auto *RRef = cv3T3->getAs<RValueReferenceType>())
-    VK = RRef->getPointeeType()->isFunctionType() ? VK_LValue : VK_XValue;
-  cv3T3 = cv3T3.getNonLValueExprType(S.Context);
-
-  // Add the user-defined conversion step.
-  bool HadMultipleCandidates = (CandidateSet.size() > 1);
-  Sequence.AddUserConversionStep(Function, Best->FoundDecl, cv3T3,
-                                 HadMultipleCandidates);
-
-  // Determine whether we'll need to perform derived-to-base adjustments or
-  // other conversions.
-  bool NewDerivedToBase = false;
-  bool NewObjCConversion = false;
-  bool NewObjCLifetimeConversion = false;
-  Sema::ReferenceCompareResult NewRefRelationship
-    = S.CompareReferenceRelationship(DeclLoc, T1, cv3T3,
-                                     NewDerivedToBase, NewObjCConversion,
-                                     NewObjCLifetimeConversion);
-
-  // Add the final conversion sequence, if necessary.
-  if (NewRefRelationship == Sema::Ref_Incompatible) {
-    assert(!isa<CXXConstructorDecl>(Function) &&
-           "should not have conversion after constructor");
-
-    ImplicitConversionSequence ICS;
-    ICS.setStandard();
-    ICS.Standard = Best->FinalConversion;
-    Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2));
-
-    // Every implicit conversion results in a prvalue, except for a glvalue
-    // derived-to-base conversion, which we handle below.
-    cv3T3 = ICS.Standard.getToType(2);
-    VK = VK_RValue;
-  }
-
-  //   If the converted initializer is a prvalue, its type T4 is adjusted to
-  //   type "cv1 T4" and the temporary materialization conversion is applied.
-  //
-  // We adjust the cv-qualifications to match the reference regardless of
-  // whether we have a prvalue so that the AST records the change. In this
-  // case, T4 is "cv3 T3".
-  QualType cv1T4 = S.Context.getQualifiedType(cv3T3, cv1T1.getQualifiers());
-  if (cv1T4.getQualifiers() != cv3T3.getQualifiers())
-    Sequence.AddQualificationConversionStep(cv1T4, VK);
-  Sequence.AddReferenceBindingStep(cv1T4, VK == VK_RValue);
-  VK = IsLValueRef ? VK_LValue : VK_XValue;
-
-  if (NewDerivedToBase)
-    Sequence.AddDerivedToBaseCastStep(cv1T1, VK);
-  else if (NewObjCConversion)
-    Sequence.AddObjCObjectConversionStep(cv1T1);
-
-  return OR_Success;
-}
-
-static void CheckCXX98CompatAccessibleCopy(Sema &S,
-                                           const InitializedEntity &Entity,
-                                           Expr *CurInitExpr);
-
-/// Attempt reference initialization (C++0x [dcl.init.ref])
-static void TryReferenceInitialization(Sema &S,
-                                       const InitializedEntity &Entity,
-                                       const InitializationKind &Kind,
-                                       Expr *Initializer,
-                                       InitializationSequence &Sequence) {
-  QualType DestType = Entity.getType();
-  QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType();
-  Qualifiers T1Quals;
-  QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
-  QualType cv2T2 = Initializer->getType();
-  Qualifiers T2Quals;
-  QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
-
-  // If the initializer is the address of an overloaded function, try
-  // to resolve the overloaded function. If all goes well, T2 is the
-  // type of the resulting function.
-  if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
-                                                   T1, Sequence))
-    return;
-
-  // Delegate everything else to a subfunction.
-  TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
-                                 T1Quals, cv2T2, T2, T2Quals, Sequence);
-}
-
-/// Determine whether an expression is a non-referenceable glvalue (one to
-/// which a reference can never bind). Attempting to bind a reference to
-/// such a glvalue will always create a temporary.
-static bool isNonReferenceableGLValue(Expr *E) {
-  return E->refersToBitField() || E->refersToVectorElement();
-}
-
-/// Reference initialization without resolving overloaded functions.
-static void TryReferenceInitializationCore(Sema &S,
-                                           const InitializedEntity &Entity,
-                                           const InitializationKind &Kind,
-                                           Expr *Initializer,
-                                           QualType cv1T1, QualType T1,
-                                           Qualifiers T1Quals,
-                                           QualType cv2T2, QualType T2,
-                                           Qualifiers T2Quals,
-                                           InitializationSequence &Sequence) {
-  QualType DestType = Entity.getType();
-  SourceLocation DeclLoc = Initializer->getBeginLoc();
-  // Compute some basic properties of the types and the initializer.
-  bool isLValueRef = DestType->isLValueReferenceType();
-  bool isRValueRef = !isLValueRef;
-  bool DerivedToBase = false;
-  bool ObjCConversion = false;
-  bool ObjCLifetimeConversion = false;
-  Expr::Classification InitCategory = Initializer->Classify(S.Context);
-  Sema::ReferenceCompareResult RefRelationship
-    = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, DerivedToBase,
-                                     ObjCConversion, ObjCLifetimeConversion);
-
-  // C++0x [dcl.init.ref]p5:
-  //   A reference to type "cv1 T1" is initialized by an expression of type
-  //   "cv2 T2" as follows:
-  //
-  //     - If the reference is an lvalue reference and the initializer
-  //       expression
-  // Note the analogous bullet points for rvalue refs to functions. Because
-  // there are no function rvalues in C++, rvalue refs to functions are treated
-  // like lvalue refs.
-  OverloadingResult ConvOvlResult = OR_Success;
-  bool T1Function = T1->isFunctionType();
-  if (isLValueRef || T1Function) {
-    if (InitCategory.isLValue() && !isNonReferenceableGLValue(Initializer) &&
-        (RefRelationship == Sema::Ref_Compatible ||
-         (Kind.isCStyleOrFunctionalCast() &&
-          RefRelationship == Sema::Ref_Related))) {
-      //   - is an lvalue (but is not a bit-field), and "cv1 T1" is
-      //     reference-compatible with "cv2 T2," or
-      if (T1Quals != T2Quals)
-        // Convert to cv1 T2. This should only add qualifiers unless this is a
-        // c-style cast. The removal of qualifiers in that case notionally
-        // happens after the reference binding, but that doesn't matter.
-        Sequence.AddQualificationConversionStep(
-            S.Context.getQualifiedType(T2, T1Quals),
-            Initializer->getValueKind());
-      if (DerivedToBase)
-        Sequence.AddDerivedToBaseCastStep(cv1T1, VK_LValue);
-      else if (ObjCConversion)
-        Sequence.AddObjCObjectConversionStep(cv1T1);
-
-      // We only create a temporary here when binding a reference to a
-      // bit-field or vector element. Those cases are't supposed to be
-      // handled by this bullet, but the outcome is the same either way.
-      Sequence.AddReferenceBindingStep(cv1T1, false);
-      return;
-    }
-
-    //     - has a class type (i.e., T2 is a class type), where T1 is not
-    //       reference-related to T2, and can be implicitly converted to an
-    //       lvalue of type "cv3 T3," where "cv1 T1" is reference-compatible
-    //       with "cv3 T3" (this conversion is selected by enumerating the
-    //       applicable conversion functions (13.3.1.6) and choosing the best
-    //       one through overload resolution (13.3)),
-    // If we have an rvalue ref to function type here, the rhs must be
-    // an rvalue. DR1287 removed the "implicitly" here.
-    if (RefRelationship == Sema::Ref_Incompatible && T2->isRecordType() &&
-        (isLValueRef || InitCategory.isRValue())) {
-      ConvOvlResult = TryRefInitWithConversionFunction(
-          S, Entity, Kind, Initializer, /*AllowRValues*/ isRValueRef,
-          /*IsLValueRef*/ isLValueRef, Sequence);
-      if (ConvOvlResult == OR_Success)
-        return;
-      if (ConvOvlResult != OR_No_Viable_Function)
-        Sequence.SetOverloadFailure(
-            InitializationSequence::FK_ReferenceInitOverloadFailed,
-            ConvOvlResult);
-    }
-  }
-
-  //     - Otherwise, the reference shall be an lvalue reference to a
-  //       non-volatile const type (i.e., cv1 shall be const), or the reference
-  //       shall be an rvalue reference.
-  if (isLValueRef && !(T1Quals.hasConst() && !T1Quals.hasVolatile())) {
-    if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
-      Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
-    else if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
-      Sequence.SetOverloadFailure(
-                        InitializationSequence::FK_ReferenceInitOverloadFailed,
-                                  ConvOvlResult);
-    else if (!InitCategory.isLValue())
-      Sequence.SetFailed(
-          InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
-    else {
-      InitializationSequence::FailureKind FK;
-      switch (RefRelationship) {
-      case Sema::Ref_Compatible:
-        if (Initializer->refersToBitField())
-          FK = InitializationSequence::
-              FK_NonConstLValueReferenceBindingToBitfield;
-        else if (Initializer->refersToVectorElement())
-          FK = InitializationSequence::
-              FK_NonConstLValueReferenceBindingToVectorElement;
-        else
-          llvm_unreachable("unexpected kind of compatible initializer");
-        break;
-      case Sema::Ref_Related:
-        FK = InitializationSequence::FK_ReferenceInitDropsQualifiers;
-        break;
-      case Sema::Ref_Incompatible:
-        FK = InitializationSequence::
-            FK_NonConstLValueReferenceBindingToUnrelated;
-        break;
-      }
-      Sequence.SetFailed(FK);
-    }
-    return;
-  }
-
-  //    - If the initializer expression
-  //      - is an
-  // [<=14] xvalue (but not a bit-field), class prvalue, array prvalue, or
-  // [1z]   rvalue (but not a bit-field) or
-  //        function lvalue and "cv1 T1" is reference-compatible with "cv2 T2"
-  //
-  // Note: functions are handled above and below rather than here...
-  if (!T1Function &&
-      (RefRelationship == Sema::Ref_Compatible ||
-       (Kind.isCStyleOrFunctionalCast() &&
-        RefRelationship == Sema::Ref_Related)) &&
-      ((InitCategory.isXValue() && !isNonReferenceableGLValue(Initializer)) ||
-       (InitCategory.isPRValue() &&
-        (S.getLangOpts().CPlusPlus17 || T2->isRecordType() ||
-         T2->isArrayType())))) {
-    ExprValueKind ValueKind = InitCategory.isXValue() ? VK_XValue : VK_RValue;
-    if (InitCategory.isPRValue() && T2->isRecordType()) {
-      // The corresponding bullet in C++03 [dcl.init.ref]p5 gives the
-      // compiler the freedom to perform a copy here or bind to the
-      // object, while C++0x requires that we bind directly to the
-      // object. Hence, we always bind to the object without making an
-      // extra copy. However, in C++03 requires that we check for the
-      // presence of a suitable copy constructor:
-      //
-      //   The constructor that would be used to make the copy shall
-      //   be callable whether or not the copy is actually done.
-      if (!S.getLangOpts().CPlusPlus11 && !S.getLangOpts().MicrosoftExt)
-        Sequence.AddExtraneousCopyToTemporary(cv2T2);
-      else if (S.getLangOpts().CPlusPlus11)
-        CheckCXX98CompatAccessibleCopy(S, Entity, Initializer);
-    }
-
-    // C++1z [dcl.init.ref]/5.2.1.2:
-    //   If the converted initializer is a prvalue, its type T4 is adjusted
-    //   to type "cv1 T4" and the temporary materialization conversion is
-    //   applied.
-    // Postpone address space conversions to after the temporary materialization
-    // conversion to allow creating temporaries in the alloca address space.
-    auto AS1 = T1Quals.getAddressSpace();
-    auto AS2 = T2Quals.getAddressSpace();
-    T1Quals.removeAddressSpace();
-    T2Quals.removeAddressSpace();
-    QualType cv1T4 = S.Context.getQualifiedType(cv2T2, T1Quals);
-    if (T1Quals != T2Quals)
-      Sequence.AddQualificationConversionStep(cv1T4, ValueKind);
-    Sequence.AddReferenceBindingStep(cv1T4, ValueKind == VK_RValue);
-    ValueKind = isLValueRef ? VK_LValue : VK_XValue;
-    if (AS1 != AS2) {
-      T1Quals.addAddressSpace(AS1);
-      QualType cv1AST4 = S.Context.getQualifiedType(cv2T2, T1Quals);
-      Sequence.AddQualificationConversionStep(cv1AST4, ValueKind);
-    }
-
-    //   In any case, the reference is bound to the resulting glvalue (or to
-    //   an appropriate base class subobject).
-    if (DerivedToBase)
-      Sequence.AddDerivedToBaseCastStep(cv1T1, ValueKind);
-    else if (ObjCConversion)
-      Sequence.AddObjCObjectConversionStep(cv1T1);
-    return;
-  }
-
-  //       - has a class type (i.e., T2 is a class type), where T1 is not
-  //         reference-related to T2, and can be implicitly converted to an
-  //         xvalue, class prvalue, or function lvalue of type "cv3 T3",
-  //         where "cv1 T1" is reference-compatible with "cv3 T3",
-  //
-  // DR1287 removes the "implicitly" here.
-  if (T2->isRecordType()) {
-    if (RefRelationship == Sema::Ref_Incompatible) {
-      ConvOvlResult = TryRefInitWithConversionFunction(
-          S, Entity, Kind, Initializer, /*AllowRValues*/ true,
-          /*IsLValueRef*/ isLValueRef, Sequence);
-      if (ConvOvlResult)
-        Sequence.SetOverloadFailure(
-            InitializationSequence::FK_ReferenceInitOverloadFailed,
-            ConvOvlResult);
-
-      return;
-    }
-
-    if (RefRelationship == Sema::Ref_Compatible &&
-        isRValueRef && InitCategory.isLValue()) {
-      Sequence.SetFailed(
-        InitializationSequence::FK_RValueReferenceBindingToLValue);
-      return;
-    }
-
-    Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
-    return;
-  }
-
-  //      - Otherwise, a temporary of type "cv1 T1" is created and initialized
-  //        from the initializer expression using the rules for a non-reference
-  //        copy-initialization (8.5). The reference is then bound to the
-  //        temporary. [...]
-
-  InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(cv1T1);
-
-  // FIXME: Why do we use an implicit conversion here rather than trying
-  // copy-initialization?
-  ImplicitConversionSequence ICS
-    = S.TryImplicitConversion(Initializer, TempEntity.getType(),
-                              /*SuppressUserConversions=*/false,
-                              /*AllowExplicit=*/false,
-                              /*FIXME:InOverloadResolution=*/false,
-                              /*CStyle=*/Kind.isCStyleOrFunctionalCast(),
-                              /*AllowObjCWritebackConversion=*/false);
-
-  if (ICS.isBad()) {
-    // FIXME: Use the conversion function set stored in ICS to turn
-    // this into an overloading ambiguity diagnostic. However, we need
-    // to keep that set as an OverloadCandidateSet rather than as some
-    // other kind of set.
-    if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
-      Sequence.SetOverloadFailure(
-                        InitializationSequence::FK_ReferenceInitOverloadFailed,
-                                  ConvOvlResult);
-    else if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
-      Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
-    else
-      Sequence.SetFailed(InitializationSequence::FK_ReferenceInitFailed);
-    return;
-  } else {
-    Sequence.AddConversionSequenceStep(ICS, TempEntity.getType());
-  }
-
-  //        [...] If T1 is reference-related to T2, cv1 must be the
-  //        same cv-qualification as, or greater cv-qualification
-  //        than, cv2; otherwise, the program is ill-formed.
-  unsigned T1CVRQuals = T1Quals.getCVRQualifiers();
-  unsigned T2CVRQuals = T2Quals.getCVRQualifiers();
-  if (RefRelationship == Sema::Ref_Related &&
-      (T1CVRQuals | T2CVRQuals) != T1CVRQuals) {
-    Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
-    return;
-  }
-
-  //   [...] If T1 is reference-related to T2 and the reference is an rvalue
-  //   reference, the initializer expression shall not be an lvalue.
-  if (RefRelationship >= Sema::Ref_Related && !isLValueRef &&
-      InitCategory.isLValue()) {
-    Sequence.SetFailed(
-                    InitializationSequence::FK_RValueReferenceBindingToLValue);
-    return;
-  }
-
-  Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true);
-}
-
-/// Attempt character array initialization from a string literal
-/// (C++ [dcl.init.string], C99 6.7.8).
-static void TryStringLiteralInitialization(Sema &S,
-                                           const InitializedEntity &Entity,
-                                           const InitializationKind &Kind,
-                                           Expr *Initializer,
-                                       InitializationSequence &Sequence) {
-  Sequence.AddStringInitStep(Entity.getType());
-}
-
-/// Attempt value initialization (C++ [dcl.init]p7).
-static void TryValueInitialization(Sema &S,
-                                   const InitializedEntity &Entity,
-                                   const InitializationKind &Kind,
-                                   InitializationSequence &Sequence,
-                                   InitListExpr *InitList) {
-  assert((!InitList || InitList->getNumInits() == 0) &&
-         "Shouldn't use value-init for non-empty init lists");
-
-  // C++98 [dcl.init]p5, C++11 [dcl.init]p7:
-  //
-  //   To value-initialize an object of type T means:
-  QualType T = Entity.getType();
-
-  //     -- if T is an array type, then each element is value-initialized;
-  T = S.Context.getBaseElementType(T);
-
-  if (const RecordType *RT = T->getAs<RecordType>()) {
-    if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
-      bool NeedZeroInitialization = true;
-      // C++98:
-      // -- if T is a class type (clause 9) with a user-declared constructor
-      //    (12.1), then the default constructor for T is called (and the
-      //    initialization is ill-formed if T has no accessible default
-      //    constructor);
-      // C++11:
-      // -- if T is a class type (clause 9) with either no default constructor
-      //    (12.1 [class.ctor]) or a default constructor that is user-provided
-      //    or deleted, then the object is default-initialized;
-      //
-      // Note that the C++11 rule is the same as the C++98 rule if there are no
-      // defaulted or deleted constructors, so we just use it unconditionally.
-      CXXConstructorDecl *CD = S.LookupDefaultConstructor(ClassDecl);
-      if (!CD || !CD->getCanonicalDecl()->isDefaulted() || CD->isDeleted())
-        NeedZeroInitialization = false;
-
-      // -- if T is a (possibly cv-qualified) non-union class type without a
-      //    user-provided or deleted default constructor, then the object is
-      //    zero-initialized and, if T has a non-trivial default constructor,
-      //    default-initialized;
-      // The 'non-union' here was removed by DR1502. The 'non-trivial default
-      // constructor' part was removed by DR1507.
-      if (NeedZeroInitialization)
-        Sequence.AddZeroInitializationStep(Entity.getType());
-
-      // C++03:
-      // -- if T is a non-union class type without a user-declared constructor,
-      //    then every non-static data member and base class component of T is
-      //    value-initialized;
-      // [...] A program that calls for [...] value-initialization of an
-      // entity of reference type is ill-formed.
-      //
-      // C++11 doesn't need this handling, because value-initialization does not
-      // occur recursively there, and the implicit default constructor is
-      // defined as deleted in the problematic cases.
-      if (!S.getLangOpts().CPlusPlus11 &&
-          ClassDecl->hasUninitializedReferenceMember()) {
-        Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForReference);
-        return;
-      }
-
-      // If this is list-value-initialization, pass the empty init list on when
-      // building the constructor call. This affects the semantics of a few
-      // things (such as whether an explicit default constructor can be called).
-      Expr *InitListAsExpr = InitList;
-      MultiExprArg Args(&InitListAsExpr, InitList ? 1 : 0);
-      bool InitListSyntax = InitList;
-
-      // FIXME: Instead of creating a CXXConstructExpr of array type here,
-      // wrap a class-typed CXXConstructExpr in an ArrayInitLoopExpr.
-      return TryConstructorInitialization(
-          S, Entity, Kind, Args, T, Entity.getType(), Sequence, InitListSyntax);
-    }
-  }
-
-  Sequence.AddZeroInitializationStep(Entity.getType());
-}
-
-/// Attempt default initialization (C++ [dcl.init]p6).
-static void TryDefaultInitialization(Sema &S,
-                                     const InitializedEntity &Entity,
-                                     const InitializationKind &Kind,
-                                     InitializationSequence &Sequence) {
-  assert(Kind.getKind() == InitializationKind::IK_Default);
-
-  // C++ [dcl.init]p6:
-  //   To default-initialize an object of type T means:
-  //     - if T is an array type, each element is default-initialized;
-  QualType DestType = S.Context.getBaseElementType(Entity.getType());
-
-  //     - if T is a (possibly cv-qualified) class type (Clause 9), the default
-  //       constructor for T is called (and the initialization is ill-formed if
-  //       T has no accessible default constructor);
-  if (DestType->isRecordType() && S.getLangOpts().CPlusPlus) {
-    TryConstructorInitialization(S, Entity, Kind, None, DestType,
-                                 Entity.getType(), Sequence);
-    return;
-  }
-
-  //     - otherwise, no initialization is performed.
-
-  //   If a program calls for the default initialization of an object of
-  //   a const-qualified type T, T shall be a class type with a user-provided
-  //   default constructor.
-  if (DestType.isConstQualified() && S.getLangOpts().CPlusPlus) {
-    if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity))
-      Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
-    return;
-  }
-
-  // If the destination type has a lifetime property, zero-initialize it.
-  if (DestType.getQualifiers().hasObjCLifetime()) {
-    Sequence.AddZeroInitializationStep(Entity.getType());
-    return;
-  }
-}
-
-/// Attempt a user-defined conversion between two types (C++ [dcl.init]),
-/// which enumerates all conversion functions and performs overload resolution
-/// to select the best.
-static void TryUserDefinedConversion(Sema &S,
-                                     QualType DestType,
-                                     const InitializationKind &Kind,
-                                     Expr *Initializer,
-                                     InitializationSequence &Sequence,
-                                     bool TopLevelOfInitList) {
-  assert(!DestType->isReferenceType() && "References are handled elsewhere");
-  QualType SourceType = Initializer->getType();
-  assert((DestType->isRecordType() || SourceType->isRecordType()) &&
-         "Must have a class type to perform a user-defined conversion");
-
-  // Build the candidate set directly in the initialization sequence
-  // structure, so that it will persist if we fail.
-  OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
-  CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion);
-
-  // Determine whether we are allowed to call explicit constructors or
-  // explicit conversion operators.
-  bool AllowExplicit = Kind.AllowExplicit();
-
-  if (const RecordType *DestRecordType = DestType->getAs<RecordType>()) {
-    // The type we're converting to is a class type. Enumerate its constructors
-    // to see if there is a suitable conversion.
-    CXXRecordDecl *DestRecordDecl
-      = cast<CXXRecordDecl>(DestRecordType->getDecl());
-
-    // Try to complete the type we're converting to.
-    if (S.isCompleteType(Kind.getLocation(), DestType)) {
-      for (NamedDecl *D : S.LookupConstructors(DestRecordDecl)) {
-        auto Info = getConstructorInfo(D);
-        if (!Info.Constructor)
-          continue;
-
-        if (!Info.Constructor->isInvalidDecl() &&
-            Info.Constructor->isConvertingConstructor(AllowExplicit)) {
-          if (Info.ConstructorTmpl)
-            S.AddTemplateOverloadCandidate(Info.ConstructorTmpl, Info.FoundDecl,
-                                           /*ExplicitArgs*/ nullptr,
-                                           Initializer, CandidateSet,
-                                           /*SuppressUserConversions=*/true);
-          else
-            S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl,
-                                   Initializer, CandidateSet,
-                                   /*SuppressUserConversions=*/true);
-        }
-      }
-    }
-  }
-
-  SourceLocation DeclLoc = Initializer->getBeginLoc();
-
-  if (const RecordType *SourceRecordType = SourceType->getAs<RecordType>()) {
-    // The type we're converting from is a class type, enumerate its conversion
-    // functions.
-
-    // We can only enumerate the conversion functions for a complete type; if
-    // the type isn't complete, simply skip this step.
-    if (S.isCompleteType(DeclLoc, SourceType)) {
-      CXXRecordDecl *SourceRecordDecl
-        = cast<CXXRecordDecl>(SourceRecordType->getDecl());
-
-      const auto &Conversions =
-          SourceRecordDecl->getVisibleConversionFunctions();
-      for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
-        NamedDecl *D = *I;
-        CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
-        if (isa<UsingShadowDecl>(D))
-          D = cast<UsingShadowDecl>(D)->getTargetDecl();
-
-        FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
-        CXXConversionDecl *Conv;
-        if (ConvTemplate)
-          Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
-        else
-          Conv = cast<CXXConversionDecl>(D);
-
-        if (AllowExplicit || !Conv->isExplicit()) {
-          if (ConvTemplate)
-            S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(),
-                                             ActingDC, Initializer, DestType,
-                                             CandidateSet, AllowExplicit);
-          else
-            S.AddConversionCandidate(Conv, I.getPair(), ActingDC,
-                                     Initializer, DestType, CandidateSet,
-                                     AllowExplicit);
-        }
-      }
-    }
-  }
-
-  // Perform overload resolution. If it fails, return the failed result.
-  OverloadCandidateSet::iterator Best;
-  if (OverloadingResult Result
-        = CandidateSet.BestViableFunction(S, DeclLoc, Best)) {
-    Sequence.SetOverloadFailure(
-                        InitializationSequence::FK_UserConversionOverloadFailed,
-                                Result);
-    return;
-  }
-
-  FunctionDecl *Function = Best->Function;
-  Function->setReferenced();
-  bool HadMultipleCandidates = (CandidateSet.size() > 1);
-
-  if (isa<CXXConstructorDecl>(Function)) {
-    // Add the user-defined conversion step. Any cv-qualification conversion is
-    // subsumed by the initialization. Per DR5, the created temporary is of the
-    // cv-unqualified type of the destination.
-    Sequence.AddUserConversionStep(Function, Best->FoundDecl,
-                                   DestType.getUnqualifiedType(),
-                                   HadMultipleCandidates);
-
-    // C++14 and before:
-    //   - if the function is a constructor, the call initializes a temporary
-    //     of the cv-unqualified version of the destination type. The [...]
-    //     temporary [...] is then used to direct-initialize, according to the
-    //     rules above, the object that is the destination of the
-    //     copy-initialization.
-    // Note that this just performs a simple object copy from the temporary.
-    //
-    // C++17:
-    //   - if the function is a constructor, the call is a prvalue of the
-    //     cv-unqualified version of the destination type whose return object
-    //     is initialized by the constructor. The call is used to
-    //     direct-initialize, according to the rules above, the object that
-    //     is the destination of the copy-initialization.
-    // Therefore we need to do nothing further.
-    //
-    // FIXME: Mark this copy as extraneous.
-    if (!S.getLangOpts().CPlusPlus17)
-      Sequence.AddFinalCopy(DestType);
-    else if (DestType.hasQualifiers())
-      Sequence.AddQualificationConversionStep(DestType, VK_RValue);
-    return;
-  }
-
-  // Add the user-defined conversion step that calls the conversion function.
-  QualType ConvType = Function->getCallResultType();
-  Sequence.AddUserConversionStep(Function, Best->FoundDecl, ConvType,
-                                 HadMultipleCandidates);
-
-  if (ConvType->getAs<RecordType>()) {
-    //   The call is used to direct-initialize [...] the object that is the
-    //   destination of the copy-initialization.
-    //
-    // In C++17, this does not call a constructor if we enter /17.6.1:
-    //   - If the initializer expression is a prvalue and the cv-unqualified
-    //     version of the source type is the same as the class of the
-    //     destination [... do not make an extra copy]
-    //
-    // FIXME: Mark this copy as extraneous.
-    if (!S.getLangOpts().CPlusPlus17 ||
-        Function->getReturnType()->isReferenceType() ||
-        !S.Context.hasSameUnqualifiedType(ConvType, DestType))
-      Sequence.AddFinalCopy(DestType);
-    else if (!S.Context.hasSameType(ConvType, DestType))
-      Sequence.AddQualificationConversionStep(DestType, VK_RValue);
-    return;
-  }
-
-  // If the conversion following the call to the conversion function
-  // is interesting, add it as a separate step.
-  if (Best->FinalConversion.First || Best->FinalConversion.Second ||
-      Best->FinalConversion.Third) {
-    ImplicitConversionSequence ICS;
-    ICS.setStandard();
-    ICS.Standard = Best->FinalConversion;
-    Sequence.AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
-  }
-}
-
-/// An egregious hack for compatibility with libstdc++-4.2: in <tr1/hashtable>,
-/// a function with a pointer return type contains a 'return false;' statement.
-/// In C++11, 'false' is not a null pointer, so this breaks the build of any
-/// code using that header.
-///
-/// Work around this by treating 'return false;' as zero-initializing the result
-/// if it's used in a pointer-returning function in a system header.
-static bool isLibstdcxxPointerReturnFalseHack(Sema &S,
-                                              const InitializedEntity &Entity,
-                                              const Expr *Init) {
-  return S.getLangOpts().CPlusPlus11 &&
-         Entity.getKind() == InitializedEntity::EK_Result &&
-         Entity.getType()->isPointerType() &&
-         isa<CXXBoolLiteralExpr>(Init) &&
-         !cast<CXXBoolLiteralExpr>(Init)->getValue() &&
-         S.getSourceManager().isInSystemHeader(Init->getExprLoc());
-}
-
-/// The non-zero enum values here are indexes into diagnostic alternatives.
-enum InvalidICRKind { IIK_okay, IIK_nonlocal, IIK_nonscalar };
-
-/// Determines whether this expression is an acceptable ICR source.
-static InvalidICRKind isInvalidICRSource(ASTContext &C, Expr *e,
-                                         bool isAddressOf, bool &isWeakAccess) {
-  // Skip parens.
-  e = e->IgnoreParens();
-
-  // Skip address-of nodes.
-  if (UnaryOperator *op = dyn_cast<UnaryOperator>(e)) {
-    if (op->getOpcode() == UO_AddrOf)
-      return isInvalidICRSource(C, op->getSubExpr(), /*addressof*/ true,
-                                isWeakAccess);
-
-  // Skip certain casts.
-  } else if (CastExpr *ce = dyn_cast<CastExpr>(e)) {
-    switch (ce->getCastKind()) {
-    case CK_Dependent:
-    case CK_BitCast:
-    case CK_LValueBitCast:
-    case CK_NoOp:
-      return isInvalidICRSource(C, ce->getSubExpr(), isAddressOf, isWeakAccess);
-
-    case CK_ArrayToPointerDecay:
-      return IIK_nonscalar;
-
-    case CK_NullToPointer:
-      return IIK_okay;
-
-    default:
-      break;
-    }
-
-  // If we have a declaration reference, it had better be a local variable.
-  } else if (isa<DeclRefExpr>(e)) {
-    // set isWeakAccess to true, to mean that there will be an implicit
-    // load which requires a cleanup.
-    if (e->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
-      isWeakAccess = true;
-
-    if (!isAddressOf) return IIK_nonlocal;
-
-    VarDecl *var = dyn_cast<VarDecl>(cast<DeclRefExpr>(e)->getDecl());
-    if (!var) return IIK_nonlocal;
-
-    return (var->hasLocalStorage() ? IIK_okay : IIK_nonlocal);
-
-  // If we have a conditional operator, check both sides.
-  } else if (ConditionalOperator *cond = dyn_cast<ConditionalOperator>(e)) {
-    if (InvalidICRKind iik = isInvalidICRSource(C, cond->getLHS(), isAddressOf,
-                                                isWeakAccess))
-      return iik;
-
-    return isInvalidICRSource(C, cond->getRHS(), isAddressOf, isWeakAccess);
-
-  // These are never scalar.
-  } else if (isa<ArraySubscriptExpr>(e)) {
-    return IIK_nonscalar;
-
-  // Otherwise, it needs to be a null pointer constant.
-  } else {
-    return (e->isNullPointerConstant(C, Expr::NPC_ValueDependentIsNull)
-            ? IIK_okay : IIK_nonlocal);
-  }
-
-  return IIK_nonlocal;
-}
-
-/// Check whether the given expression is a valid operand for an
-/// indirect copy/restore.
-static void checkIndirectCopyRestoreSource(Sema &S, Expr *src) {
-  assert(src->isRValue());
-  bool isWeakAccess = false;
-  InvalidICRKind iik = isInvalidICRSource(S.Context, src, false, isWeakAccess);
-  // If isWeakAccess to true, there will be an implicit
-  // load which requires a cleanup.
-  if (S.getLangOpts().ObjCAutoRefCount && isWeakAccess)
-    S.Cleanup.setExprNeedsCleanups(true);
-
-  if (iik == IIK_okay) return;
-
-  S.Diag(src->getExprLoc(), diag::err_arc_nonlocal_writeback)
-    << ((unsigned) iik - 1)  // shift index into diagnostic explanations
-    << src->getSourceRange();
-}
-
-/// Determine whether we have compatible array types for the
-/// purposes of GNU by-copy array initialization.
-static bool hasCompatibleArrayTypes(ASTContext &Context, const ArrayType *Dest,
-                                    const ArrayType *Source) {
-  // If the source and destination array types are equivalent, we're
-  // done.
-  if (Context.hasSameType(QualType(Dest, 0), QualType(Source, 0)))
-    return true;
-
-  // Make sure that the element types are the same.
-  if (!Context.hasSameType(Dest->getElementType(), Source->getElementType()))
-    return false;
-
-  // The only mismatch we allow is when the destination is an
-  // incomplete array type and the source is a constant array type.
-  return Source->isConstantArrayType() && Dest->isIncompleteArrayType();
-}
-
-static bool tryObjCWritebackConversion(Sema &S,
-                                       InitializationSequence &Sequence,
-                                       const InitializedEntity &Entity,
-                                       Expr *Initializer) {
-  bool ArrayDecay = false;
-  QualType ArgType = Initializer->getType();
-  QualType ArgPointee;
-  if (const ArrayType *ArgArrayType = S.Context.getAsArrayType(ArgType)) {
-    ArrayDecay = true;
-    ArgPointee = ArgArrayType->getElementType();
-    ArgType = S.Context.getPointerType(ArgPointee);
-  }
-
-  // Handle write-back conversion.
-  QualType ConvertedArgType;
-  if (!S.isObjCWritebackConversion(ArgType, Entity.getType(),
-                                   ConvertedArgType))
-    return false;
-
-  // We should copy unless we're passing to an argument explicitly
-  // marked 'out'.
-  bool ShouldCopy = true;
-  if (ParmVarDecl *param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
-    ShouldCopy = (param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
-
-  // Do we need an lvalue conversion?
-  if (ArrayDecay || Initializer->isGLValue()) {
-    ImplicitConversionSequence ICS;
-    ICS.setStandard();
-    ICS.Standard.setAsIdentityConversion();
-
-    QualType ResultType;
-    if (ArrayDecay) {
-      ICS.Standard.First = ICK_Array_To_Pointer;
-      ResultType = S.Context.getPointerType(ArgPointee);
-    } else {
-      ICS.Standard.First = ICK_Lvalue_To_Rvalue;
-      ResultType = Initializer->getType().getNonLValueExprType(S.Context);
-    }
-
-    Sequence.AddConversionSequenceStep(ICS, ResultType);
-  }
-
-  Sequence.AddPassByIndirectCopyRestoreStep(Entity.getType(), ShouldCopy);
-  return true;
-}
-
-static bool TryOCLSamplerInitialization(Sema &S,
-                                        InitializationSequence &Sequence,
-                                        QualType DestType,
-                                        Expr *Initializer) {
-  if (!S.getLangOpts().OpenCL || !DestType->isSamplerT() ||
-      (!Initializer->isIntegerConstantExpr(S.Context) &&
-      !Initializer->getType()->isSamplerT()))
-    return false;
-
-  Sequence.AddOCLSamplerInitStep(DestType);
-  return true;
-}
-
-static bool IsZeroInitializer(Expr *Initializer, Sema &S) {
-  return Initializer->isIntegerConstantExpr(S.getASTContext()) &&
-    (Initializer->EvaluateKnownConstInt(S.getASTContext()) == 0);
-}
-
-static bool TryOCLZeroOpaqueTypeInitialization(Sema &S,
-                                               InitializationSequence &Sequence,
-                                               QualType DestType,
-                                               Expr *Initializer) {
-  if (!S.getLangOpts().OpenCL)
-    return false;
-
-  //
-  // OpenCL 1.2 spec, s6.12.10
-  //
-  // The event argument can also be used to associate the
-  // async_work_group_copy with a previous async copy allowing
-  // an event to be shared by multiple async copies; otherwise
-  // event should be zero.
-  //
-  if (DestType->isEventT() || DestType->isQueueT()) {
-    if (!IsZeroInitializer(Initializer, S))
-      return false;
-
-    Sequence.AddOCLZeroOpaqueTypeStep(DestType);
-    return true;
-  }
-
-  // We should allow zero initialization for all types defined in the
-  // cl_intel_device_side_avc_motion_estimation extension, except
-  // intel_sub_group_avc_mce_payload_t and intel_sub_group_avc_mce_result_t.
-  if (S.getOpenCLOptions().isEnabled(
-          "cl_intel_device_side_avc_motion_estimation") &&
-      DestType->isOCLIntelSubgroupAVCType()) {
-    if (DestType->isOCLIntelSubgroupAVCMcePayloadType() ||
-        DestType->isOCLIntelSubgroupAVCMceResultType())
-      return false;
-    if (!IsZeroInitializer(Initializer, S))
-      return false;
-
-    Sequence.AddOCLZeroOpaqueTypeStep(DestType);
-    return true;
-  }
-
-  return false;
-}
-
-InitializationSequence::InitializationSequence(Sema &S,
-                                               const InitializedEntity &Entity,
-                                               const InitializationKind &Kind,
-                                               MultiExprArg Args,
-                                               bool TopLevelOfInitList,
-                                               bool TreatUnavailableAsInvalid)
-    : FailedCandidateSet(Kind.getLocation(), OverloadCandidateSet::CSK_Normal) {
-  InitializeFrom(S, Entity, Kind, Args, TopLevelOfInitList,
-                 TreatUnavailableAsInvalid);
-}
-
-/// Tries to get a FunctionDecl out of `E`. If it succeeds and we can take the
-/// address of that function, this returns true. Otherwise, it returns false.
-static bool isExprAnUnaddressableFunction(Sema &S, const Expr *E) {
-  auto *DRE = dyn_cast<DeclRefExpr>(E);
-  if (!DRE || !isa<FunctionDecl>(DRE->getDecl()))
-    return false;
-
-  return !S.checkAddressOfFunctionIsAvailable(
-      cast<FunctionDecl>(DRE->getDecl()));
-}
-
-/// Determine whether we can perform an elementwise array copy for this kind
-/// of entity.
-static bool canPerformArrayCopy(const InitializedEntity &Entity) {
-  switch (Entity.getKind()) {
-  case InitializedEntity::EK_LambdaCapture:
-    // C++ [expr.prim.lambda]p24:
-    //   For array members, the array elements are direct-initialized in
-    //   increasing subscript order.
-    return true;
-
-  case InitializedEntity::EK_Variable:
-    // C++ [dcl.decomp]p1:
-    //   [...] each element is copy-initialized or direct-initialized from the
-    //   corresponding element of the assignment-expression [...]
-    return isa<DecompositionDecl>(Entity.getDecl());
-
-  case InitializedEntity::EK_Member:
-    // C++ [class.copy.ctor]p14:
-    //   - if the member is an array, each element is direct-initialized with
-    //     the corresponding subobject of x
-    return Entity.isImplicitMemberInitializer();
-
-  case InitializedEntity::EK_ArrayElement:
-    // All the above cases are intended to apply recursively, even though none
-    // of them actually say that.
-    if (auto *E = Entity.getParent())
-      return canPerformArrayCopy(*E);
-    break;
-
-  default:
-    break;
-  }
-
-  return false;
-}
-
-void InitializationSequence::InitializeFrom(Sema &S,
-                                            const InitializedEntity &Entity,
-                                            const InitializationKind &Kind,
-                                            MultiExprArg Args,
-                                            bool TopLevelOfInitList,
-                                            bool TreatUnavailableAsInvalid) {
-  ASTContext &Context = S.Context;
-
-  // Eliminate non-overload placeholder types in the arguments.  We
-  // need to do this before checking whether types are dependent
-  // because lowering a pseudo-object expression might well give us
-  // something of dependent type.
-  for (unsigned I = 0, E = Args.size(); I != E; ++I)
-    if (Args[I]->getType()->isNonOverloadPlaceholderType()) {
-      // FIXME: should we be doing this here?
-      ExprResult result = S.CheckPlaceholderExpr(Args[I]);
-      if (result.isInvalid()) {
-        SetFailed(FK_PlaceholderType);
-        return;
-      }
-      Args[I] = result.get();
-    }
-
-  // C++0x [dcl.init]p16:
-  //   The semantics of initializers are as follows. The destination type is
-  //   the type of the object or reference being initialized and the source
-  //   type is the type of the initializer expression. The source type is not
-  //   defined when the initializer is a braced-init-list or when it is a
-  //   parenthesized list of expressions.
-  QualType DestType = Entity.getType();
-
-  if (DestType->isDependentType() ||
-      Expr::hasAnyTypeDependentArguments(Args)) {
-    SequenceKind = DependentSequence;
-    return;
-  }
-
-  // Almost everything is a normal sequence.
-  setSequenceKind(NormalSequence);
-
-  QualType SourceType;
-  Expr *Initializer = nullptr;
-  if (Args.size() == 1) {
-    Initializer = Args[0];
-    if (S.getLangOpts().ObjC) {
-      if (S.CheckObjCBridgeRelatedConversions(Initializer->getBeginLoc(),
-                                              DestType, Initializer->getType(),
-                                              Initializer) ||
-          S.ConversionToObjCStringLiteralCheck(DestType, Initializer))
-        Args[0] = Initializer;
-    }
-    if (!isa<InitListExpr>(Initializer))
-      SourceType = Initializer->getType();
-  }
-
-  //     - If the initializer is a (non-parenthesized) braced-init-list, the
-  //       object is list-initialized (8.5.4).
-  if (Kind.getKind() != InitializationKind::IK_Direct) {
-    if (InitListExpr *InitList = dyn_cast_or_null<InitListExpr>(Initializer)) {
-      TryListInitialization(S, Entity, Kind, InitList, *this,
-                            TreatUnavailableAsInvalid);
-      return;
-    }
-  }
-
-  //     - If the destination type is a reference type, see 8.5.3.
-  if (DestType->isReferenceType()) {
-    // C++0x [dcl.init.ref]p1:
-    //   A variable declared to be a T& or T&&, that is, "reference to type T"
-    //   (8.3.2), shall be initialized by an object, or function, of type T or
-    //   by an object that can be converted into a T.
-    // (Therefore, multiple arguments are not permitted.)
-    if (Args.size() != 1)
-      SetFailed(FK_TooManyInitsForReference);
-    // C++17 [dcl.init.ref]p5:
-    //   A reference [...] is initialized by an expression [...] as follows:
-    // If the initializer is not an expression, presumably we should reject,
-    // but the standard fails to actually say so.
-    else if (isa<InitListExpr>(Args[0]))
-      SetFailed(FK_ParenthesizedListInitForReference);
-    else
-      TryReferenceInitialization(S, Entity, Kind, Args[0], *this);
-    return;
-  }
-
-  //     - If the initializer is (), the object is value-initialized.
-  if (Kind.getKind() == InitializationKind::IK_Value ||
-      (Kind.getKind() == InitializationKind::IK_Direct && Args.empty())) {
-    TryValueInitialization(S, Entity, Kind, *this);
-    return;
-  }
-
-  // Handle default initialization.
-  if (Kind.getKind() == InitializationKind::IK_Default) {
-    TryDefaultInitialization(S, Entity, Kind, *this);
-    return;
-  }
-
-  //     - If the destination type is an array of characters, an array of
-  //       char16_t, an array of char32_t, or an array of wchar_t, and the
-  //       initializer is a string literal, see 8.5.2.
-  //     - Otherwise, if the destination type is an array, the program is
-  //       ill-formed.
-  if (const ArrayType *DestAT = Context.getAsArrayType(DestType)) {
-    if (Initializer && isa<VariableArrayType>(DestAT)) {
-      SetFailed(FK_VariableLengthArrayHasInitializer);
-      return;
-    }
-
-    if (Initializer) {
-      switch (IsStringInit(Initializer, DestAT, Context)) {
-      case SIF_None:
-        TryStringLiteralInitialization(S, Entity, Kind, Initializer, *this);
-        return;
-      case SIF_NarrowStringIntoWideChar:
-        SetFailed(FK_NarrowStringIntoWideCharArray);
-        return;
-      case SIF_WideStringIntoChar:
-        SetFailed(FK_WideStringIntoCharArray);
-        return;
-      case SIF_IncompatWideStringIntoWideChar:
-        SetFailed(FK_IncompatWideStringIntoWideChar);
-        return;
-      case SIF_PlainStringIntoUTF8Char:
-        SetFailed(FK_PlainStringIntoUTF8Char);
-        return;
-      case SIF_UTF8StringIntoPlainChar:
-        SetFailed(FK_UTF8StringIntoPlainChar);
-        return;
-      case SIF_Other:
-        break;
-      }
-    }
-
-    // Some kinds of initialization permit an array to be initialized from
-    // another array of the same type, and perform elementwise initialization.
-    if (Initializer && isa<ConstantArrayType>(DestAT) &&
-        S.Context.hasSameUnqualifiedType(Initializer->getType(),
-                                         Entity.getType()) &&
-        canPerformArrayCopy(Entity)) {
-      // If source is a prvalue, use it directly.
-      if (Initializer->getValueKind() == VK_RValue) {
-        AddArrayInitStep(DestType, /*IsGNUExtension*/false);
-        return;
-      }
-
-      // Emit element-at-a-time copy loop.
-      InitializedEntity Element =
-          InitializedEntity::InitializeElement(S.Context, 0, Entity);
-      QualType InitEltT =
-          Context.getAsArrayType(Initializer->getType())->getElementType();
-      OpaqueValueExpr OVE(Initializer->getExprLoc(), InitEltT,
-                          Initializer->getValueKind(),
-                          Initializer->getObjectKind());
-      Expr *OVEAsExpr = &OVE;
-      InitializeFrom(S, Element, Kind, OVEAsExpr, TopLevelOfInitList,
-                     TreatUnavailableAsInvalid);
-      if (!Failed())
-        AddArrayInitLoopStep(Entity.getType(), InitEltT);
-      return;
-    }
-
-    // Note: as an GNU C extension, we allow initialization of an
-    // array from a compound literal that creates an array of the same
-    // type, so long as the initializer has no side effects.
-    if (!S.getLangOpts().CPlusPlus && Initializer &&
-        (isa<ConstantExpr>(Initializer->IgnoreParens()) ||
-         isa<CompoundLiteralExpr>(Initializer->IgnoreParens())) &&
-        Initializer->getType()->isArrayType()) {
-      const ArrayType *SourceAT
-        = Context.getAsArrayType(Initializer->getType());
-      if (!hasCompatibleArrayTypes(S.Context, DestAT, SourceAT))
-        SetFailed(FK_ArrayTypeMismatch);
-      else if (Initializer->HasSideEffects(S.Context))
-        SetFailed(FK_NonConstantArrayInit);
-      else {
-        AddArrayInitStep(DestType, /*IsGNUExtension*/true);
-      }
-    }
-    // Note: as a GNU C++ extension, we allow list-initialization of a
-    // class member of array type from a parenthesized initializer list.
-    else if (S.getLangOpts().CPlusPlus &&
-             Entity.getKind() == InitializedEntity::EK_Member &&
-             Initializer && isa<InitListExpr>(Initializer)) {
-      TryListInitialization(S, Entity, Kind, cast<InitListExpr>(Initializer),
-                            *this, TreatUnavailableAsInvalid);
-      AddParenthesizedArrayInitStep(DestType);
-    } else if (DestAT->getElementType()->isCharType())
-      SetFailed(FK_ArrayNeedsInitListOrStringLiteral);
-    else if (IsWideCharCompatible(DestAT->getElementType(), Context))
-      SetFailed(FK_ArrayNeedsInitListOrWideStringLiteral);
-    else
-      SetFailed(FK_ArrayNeedsInitList);
-
-    return;
-  }
-
-  // Determine whether we should consider writeback conversions for
-  // Objective-C ARC.
-  bool allowObjCWritebackConversion = S.getLangOpts().ObjCAutoRefCount &&
-         Entity.isParameterKind();
-
-  // We're at the end of the line for C: it's either a write-back conversion
-  // or it's a C assignment. There's no need to check anything else.
-  if (!S.getLangOpts().CPlusPlus) {
-    // If allowed, check whether this is an Objective-C writeback conversion.
-    if (allowObjCWritebackConversion &&
-        tryObjCWritebackConversion(S, *this, Entity, Initializer)) {
-      return;
-    }
-
-    if (TryOCLSamplerInitialization(S, *this, DestType, Initializer))
-      return;
-
-    if (TryOCLZeroOpaqueTypeInitialization(S, *this, DestType, Initializer))
-      return;
-
-    // Handle initialization in C
-    AddCAssignmentStep(DestType);
-    MaybeProduceObjCObject(S, *this, Entity);
-    return;
-  }
-
-  assert(S.getLangOpts().CPlusPlus);
-
-  //     - If the destination type is a (possibly cv-qualified) class type:
-  if (DestType->isRecordType()) {
-    //     - If the initialization is direct-initialization, or if it is
-    //       copy-initialization where the cv-unqualified version of the
-    //       source type is the same class as, or a derived class of, the
-    //       class of the destination, constructors are considered. [...]
-    if (Kind.getKind() == InitializationKind::IK_Direct ||
-        (Kind.getKind() == InitializationKind::IK_Copy &&
-         (Context.hasSameUnqualifiedType(SourceType, DestType) ||
-          S.IsDerivedFrom(Initializer->getBeginLoc(), SourceType, DestType))))
-      TryConstructorInitialization(S, Entity, Kind, Args,
-                                   DestType, DestType, *this);
-    //     - Otherwise (i.e., for the remaining copy-initialization cases),
-    //       user-defined conversion sequences that can convert from the source
-    //       type to the destination type or (when a conversion function is
-    //       used) to a derived class thereof are enumerated as described in
-    //       13.3.1.4, and the best one is chosen through overload resolution
-    //       (13.3).
-    else
-      TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
-                               TopLevelOfInitList);
-    return;
-  }
-
-  assert(Args.size() >= 1 && "Zero-argument case handled above");
-
-  // The remaining cases all need a source type.
-  if (Args.size() > 1) {
-    SetFailed(FK_TooManyInitsForScalar);
-    return;
-  } else if (isa<InitListExpr>(Args[0])) {
-    SetFailed(FK_ParenthesizedListInitForScalar);
-    return;
-  }
-
-  //    - Otherwise, if the source type is a (possibly cv-qualified) class
-  //      type, conversion functions are considered.
-  if (!SourceType.isNull() && SourceType->isRecordType()) {
-    // For a conversion to _Atomic(T) from either T or a class type derived
-    // from T, initialize the T object then convert to _Atomic type.
-    bool NeedAtomicConversion = false;
-    if (const AtomicType *Atomic = DestType->getAs<AtomicType>()) {
-      if (Context.hasSameUnqualifiedType(SourceType, Atomic->getValueType()) ||
-          S.IsDerivedFrom(Initializer->getBeginLoc(), SourceType,
-                          Atomic->getValueType())) {
-        DestType = Atomic->getValueType();
-        NeedAtomicConversion = true;
-      }
-    }
-
-    TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
-                             TopLevelOfInitList);
-    MaybeProduceObjCObject(S, *this, Entity);
-    if (!Failed() && NeedAtomicConversion)
-      AddAtomicConversionStep(Entity.getType());
-    return;
-  }
-
-  //    - Otherwise, the initial value of the object being initialized is the
-  //      (possibly converted) value of the initializer expression. Standard
-  //      conversions (Clause 4) will be used, if necessary, to convert the
-  //      initializer expression to the cv-unqualified version of the
-  //      destination type; no user-defined conversions are considered.
-
-  ImplicitConversionSequence ICS
-    = S.TryImplicitConversion(Initializer, DestType,
-                              /*SuppressUserConversions*/true,
-                              /*AllowExplicitConversions*/ false,
-                              /*InOverloadResolution*/ false,
-                              /*CStyle=*/Kind.isCStyleOrFunctionalCast(),
-                              allowObjCWritebackConversion);
-
-  if (ICS.isStandard() &&
-      ICS.Standard.Second == ICK_Writeback_Conversion) {
-    // Objective-C ARC writeback conversion.
-
-    // We should copy unless we're passing to an argument explicitly
-    // marked 'out'.
-    bool ShouldCopy = true;
-    if (ParmVarDecl *Param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
-      ShouldCopy = (Param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
-
-    // If there was an lvalue adjustment, add it as a separate conversion.
-    if (ICS.Standard.First == ICK_Array_To_Pointer ||
-        ICS.Standard.First == ICK_Lvalue_To_Rvalue) {
-      ImplicitConversionSequence LvalueICS;
-      LvalueICS.setStandard();
-      LvalueICS.Standard.setAsIdentityConversion();
-      LvalueICS.Standard.setAllToTypes(ICS.Standard.getToType(0));
-      LvalueICS.Standard.First = ICS.Standard.First;
-      AddConversionSequenceStep(LvalueICS, ICS.Standard.getToType(0));
-    }
-
-    AddPassByIndirectCopyRestoreStep(DestType, ShouldCopy);
-  } else if (ICS.isBad()) {
-    DeclAccessPair dap;
-    if (isLibstdcxxPointerReturnFalseHack(S, Entity, Initializer)) {
-      AddZeroInitializationStep(Entity.getType());
-    } else if (Initializer->getType() == Context.OverloadTy &&
-               !S.ResolveAddressOfOverloadedFunction(Initializer, DestType,
-                                                     false, dap))
-      SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
-    else if (Initializer->getType()->isFunctionType() &&
-             isExprAnUnaddressableFunction(S, Initializer))
-      SetFailed(InitializationSequence::FK_AddressOfUnaddressableFunction);
-    else
-      SetFailed(InitializationSequence::FK_ConversionFailed);
-  } else {
-    AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
-
-    MaybeProduceObjCObject(S, *this, Entity);
-  }
-}
-
-InitializationSequence::~InitializationSequence() {
-  for (auto &S : Steps)
-    S.Destroy();
-}
-
-//===----------------------------------------------------------------------===//
-// Perform initialization
-//===----------------------------------------------------------------------===//
-static Sema::AssignmentAction
-getAssignmentAction(const InitializedEntity &Entity, bool Diagnose = false) {
-  switch(Entity.getKind()) {
-  case InitializedEntity::EK_Variable:
-  case InitializedEntity::EK_New:
-  case InitializedEntity::EK_Exception:
-  case InitializedEntity::EK_Base:
-  case InitializedEntity::EK_Delegating:
-    return Sema::AA_Initializing;
-
-  case InitializedEntity::EK_Parameter:
-    if (Entity.getDecl() &&
-        isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
-      return Sema::AA_Sending;
-
-    return Sema::AA_Passing;
-
-  case InitializedEntity::EK_Parameter_CF_Audited:
-    if (Entity.getDecl() &&
-      isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
-      return Sema::AA_Sending;
-
-    return !Diagnose ? Sema::AA_Passing : Sema::AA_Passing_CFAudited;
-
-  case InitializedEntity::EK_Result:
-  case InitializedEntity::EK_StmtExprResult: // FIXME: Not quite right.
-    return Sema::AA_Returning;
-
-  case InitializedEntity::EK_Temporary:
-  case InitializedEntity::EK_RelatedResult:
-    // FIXME: Can we tell apart casting vs. converting?
-    return Sema::AA_Casting;
-
-  case InitializedEntity::EK_Member:
-  case InitializedEntity::EK_Binding:
-  case InitializedEntity::EK_ArrayElement:
-  case InitializedEntity::EK_VectorElement:
-  case InitializedEntity::EK_ComplexElement:
-  case InitializedEntity::EK_BlockElement:
-  case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
-  case InitializedEntity::EK_LambdaCapture:
-  case InitializedEntity::EK_CompoundLiteralInit:
-    return Sema::AA_Initializing;
-  }
-
-  llvm_unreachable("Invalid EntityKind!");
-}
-
-/// Whether we should bind a created object as a temporary when
-/// initializing the given entity.
-static bool shouldBindAsTemporary(const InitializedEntity &Entity) {
-  switch (Entity.getKind()) {
-  case InitializedEntity::EK_ArrayElement:
-  case InitializedEntity::EK_Member:
-  case InitializedEntity::EK_Result:
-  case InitializedEntity::EK_StmtExprResult:
-  case InitializedEntity::EK_New:
-  case InitializedEntity::EK_Variable:
-  case InitializedEntity::EK_Base:
-  case InitializedEntity::EK_Delegating:
-  case InitializedEntity::EK_VectorElement:
-  case InitializedEntity::EK_ComplexElement:
-  case InitializedEntity::EK_Exception:
-  case InitializedEntity::EK_BlockElement:
-  case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
-  case InitializedEntity::EK_LambdaCapture:
-  case InitializedEntity::EK_CompoundLiteralInit:
-    return false;
-
-  case InitializedEntity::EK_Parameter:
-  case InitializedEntity::EK_Parameter_CF_Audited:
-  case InitializedEntity::EK_Temporary:
-  case InitializedEntity::EK_RelatedResult:
-  case InitializedEntity::EK_Binding:
-    return true;
-  }
-
-  llvm_unreachable("missed an InitializedEntity kind?");
-}
-
-/// Whether the given entity, when initialized with an object
-/// created for that initialization, requires destruction.
-static bool shouldDestroyEntity(const InitializedEntity &Entity) {
-  switch (Entity.getKind()) {
-    case InitializedEntity::EK_Result:
-    case InitializedEntity::EK_StmtExprResult:
-    case InitializedEntity::EK_New:
-    case InitializedEntity::EK_Base:
-    case InitializedEntity::EK_Delegating:
-    case InitializedEntity::EK_VectorElement:
-    case InitializedEntity::EK_ComplexElement:
-    case InitializedEntity::EK_BlockElement:
-    case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
-    case InitializedEntity::EK_LambdaCapture:
-      return false;
-
-    case InitializedEntity::EK_Member:
-    case InitializedEntity::EK_Binding:
-    case InitializedEntity::EK_Variable:
-    case InitializedEntity::EK_Parameter:
-    case InitializedEntity::EK_Parameter_CF_Audited:
-    case InitializedEntity::EK_Temporary:
-    case InitializedEntity::EK_ArrayElement:
-    case InitializedEntity::EK_Exception:
-    case InitializedEntity::EK_CompoundLiteralInit:
-    case InitializedEntity::EK_RelatedResult:
-      return true;
-  }
-
-  llvm_unreachable("missed an InitializedEntity kind?");
-}
-
-/// Get the location at which initialization diagnostics should appear.
-static SourceLocation getInitializationLoc(const InitializedEntity &Entity,
-                                           Expr *Initializer) {
-  switch (Entity.getKind()) {
-  case InitializedEntity::EK_Result:
-  case InitializedEntity::EK_StmtExprResult:
-    return Entity.getReturnLoc();
-
-  case InitializedEntity::EK_Exception:
-    return Entity.getThrowLoc();
-
-  case InitializedEntity::EK_Variable:
-  case InitializedEntity::EK_Binding:
-    return Entity.getDecl()->getLocation();
-
-  case InitializedEntity::EK_LambdaCapture:
-    return Entity.getCaptureLoc();
-
-  case InitializedEntity::EK_ArrayElement:
-  case InitializedEntity::EK_Member:
-  case InitializedEntity::EK_Parameter:
-  case InitializedEntity::EK_Parameter_CF_Audited:
-  case InitializedEntity::EK_Temporary:
-  case InitializedEntity::EK_New:
-  case InitializedEntity::EK_Base:
-  case InitializedEntity::EK_Delegating:
-  case InitializedEntity::EK_VectorElement:
-  case InitializedEntity::EK_ComplexElement:
-  case InitializedEntity::EK_BlockElement:
-  case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
-  case InitializedEntity::EK_CompoundLiteralInit:
-  case InitializedEntity::EK_RelatedResult:
-    return Initializer->getBeginLoc();
-  }
-  llvm_unreachable("missed an InitializedEntity kind?");
-}
-
-/// Make a (potentially elidable) temporary copy of the object
-/// provided by the given initializer by calling the appropriate copy
-/// constructor.
-///
-/// \param S The Sema object used for type-checking.
-///
-/// \param T The type of the temporary object, which must either be
-/// the type of the initializer expression or a superclass thereof.
-///
-/// \param Entity The entity being initialized.
-///
-/// \param CurInit The initializer expression.
-///
-/// \param IsExtraneousCopy Whether this is an "extraneous" copy that
-/// is permitted in C++03 (but not C++0x) when binding a reference to
-/// an rvalue.
-///
-/// \returns An expression that copies the initializer expression into
-/// a temporary object, or an error expression if a copy could not be
-/// created.
-static ExprResult CopyObject(Sema &S,
-                             QualType T,
-                             const InitializedEntity &Entity,
-                             ExprResult CurInit,
-                             bool IsExtraneousCopy) {
-  if (CurInit.isInvalid())
-    return CurInit;
-  // Determine which class type we're copying to.
-  Expr *CurInitExpr = (Expr *)CurInit.get();
-  CXXRecordDecl *Class = nullptr;
-  if (const RecordType *Record = T->getAs<RecordType>())
-    Class = cast<CXXRecordDecl>(Record->getDecl());
-  if (!Class)
-    return CurInit;
-
-  SourceLocation Loc = getInitializationLoc(Entity, CurInit.get());
-
-  // Make sure that the type we are copying is complete.
-  if (S.RequireCompleteType(Loc, T, diag::err_temp_copy_incomplete))
-    return CurInit;
-
-  // Perform overload resolution using the class's constructors. Per
-  // C++11 [dcl.init]p16, second bullet for class types, this initialization
-  // is direct-initialization.
-  OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
-  DeclContext::lookup_result Ctors = S.LookupConstructors(Class);
-
-  OverloadCandidateSet::iterator Best;
-  switch (ResolveConstructorOverload(
-      S, Loc, CurInitExpr, CandidateSet, T, Ctors, Best,
-      /*CopyInitializing=*/false, /*AllowExplicit=*/true,
-      /*OnlyListConstructors=*/false, /*IsListInit=*/false,
-      /*SecondStepOfCopyInit=*/true)) {
-  case OR_Success:
-    break;
-
-  case OR_No_Viable_Function:
-    S.Diag(Loc, IsExtraneousCopy && !S.isSFINAEContext()
-           ? diag::ext_rvalue_to_reference_temp_copy_no_viable
-           : diag::err_temp_copy_no_viable)
-      << (int)Entity.getKind() << CurInitExpr->getType()
-      << CurInitExpr->getSourceRange();
-    CandidateSet.NoteCandidates(S, OCD_AllCandidates, CurInitExpr);
-    if (!IsExtraneousCopy || S.isSFINAEContext())
-      return ExprError();
-    return CurInit;
-
-  case OR_Ambiguous:
-    S.Diag(Loc, diag::err_temp_copy_ambiguous)
-      << (int)Entity.getKind() << CurInitExpr->getType()
-      << CurInitExpr->getSourceRange();
-    CandidateSet.NoteCandidates(S, OCD_ViableCandidates, CurInitExpr);
-    return ExprError();
-
-  case OR_Deleted:
-    S.Diag(Loc, diag::err_temp_copy_deleted)
-      << (int)Entity.getKind() << CurInitExpr->getType()
-      << CurInitExpr->getSourceRange();
-    S.NoteDeletedFunction(Best->Function);
-    return ExprError();
-  }
-
-  bool HadMultipleCandidates = CandidateSet.size() > 1;
-
-  CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function);
-  SmallVector<Expr*, 8> ConstructorArgs;
-  CurInit.get(); // Ownership transferred into MultiExprArg, below.
-
-  S.CheckConstructorAccess(Loc, Constructor, Best->FoundDecl, Entity,
-                           IsExtraneousCopy);
-
-  if (IsExtraneousCopy) {
-    // If this is a totally extraneous copy for C++03 reference
-    // binding purposes, just return the original initialization
-    // expression. We don't generate an (elided) copy operation here
-    // because doing so would require us to pass down a flag to avoid
-    // infinite recursion, where each step adds another extraneous,
-    // elidable copy.
-
-    // Instantiate the default arguments of any extra parameters in
-    // the selected copy constructor, as if we were going to create a
-    // proper call to the copy constructor.
-    for (unsigned I = 1, N = Constructor->getNumParams(); I != N; ++I) {
-      ParmVarDecl *Parm = Constructor->getParamDecl(I);
-      if (S.RequireCompleteType(Loc, Parm->getType(),
-                                diag::err_call_incomplete_argument))
-        break;
-
-      // Build the default argument expression; we don't actually care
-      // if this succeeds or not, because this routine will complain
-      // if there was a problem.
-      S.BuildCXXDefaultArgExpr(Loc, Constructor, Parm);
-    }
-
-    return CurInitExpr;
-  }
-
-  // Determine the arguments required to actually perform the
-  // constructor call (we might have derived-to-base conversions, or
-  // the copy constructor may have default arguments).
-  if (S.CompleteConstructorCall(Constructor, CurInitExpr, Loc, ConstructorArgs))
-    return ExprError();
-
-  // C++0x [class.copy]p32:
-  //   When certain criteria are met, an implementation is allowed to
-  //   omit the copy/move construction of a class object, even if the
-  //   copy/move constructor and/or destructor for the object have
-  //   side effects. [...]
-  //     - when a temporary class object that has not been bound to a
-  //       reference (12.2) would be copied/moved to a class object
-  //       with the same cv-unqualified type, the copy/move operation
-  //       can be omitted by constructing the temporary object
-  //       directly into the target of the omitted copy/move
-  //
-  // Note that the other three bullets are handled elsewhere. Copy
-  // elision for return statements and throw expressions are handled as part
-  // of constructor initialization, while copy elision for exception handlers
-  // is handled by the run-time.
-  //
-  // FIXME: If the function parameter is not the same type as the temporary, we
-  // should still be able to elide the copy, but we don't have a way to
-  // represent in the AST how much should be elided in this case.
-  bool Elidable =
-      CurInitExpr->isTemporaryObject(S.Context, Class) &&
-      S.Context.hasSameUnqualifiedType(
-          Best->Function->getParamDecl(0)->getType().getNonReferenceType(),
-          CurInitExpr->getType());
-
-  // Actually perform the constructor call.
-  CurInit = S.BuildCXXConstructExpr(Loc, T, Best->FoundDecl, Constructor,
-                                    Elidable,
-                                    ConstructorArgs,
-                                    HadMultipleCandidates,
-                                    /*ListInit*/ false,
-                                    /*StdInitListInit*/ false,
-                                    /*ZeroInit*/ false,
-                                    CXXConstructExpr::CK_Complete,
-                                    SourceRange());
-
-  // If we're supposed to bind temporaries, do so.
-  if (!CurInit.isInvalid() && shouldBindAsTemporary(Entity))
-    CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
-  return CurInit;
-}
-
-/// Check whether elidable copy construction for binding a reference to
-/// a temporary would have succeeded if we were building in C++98 mode, for
-/// -Wc++98-compat.
-static void CheckCXX98CompatAccessibleCopy(Sema &S,
-                                           const InitializedEntity &Entity,
-                                           Expr *CurInitExpr) {
-  assert(S.getLangOpts().CPlusPlus11);
-
-  const RecordType *Record = CurInitExpr->getType()->getAs<RecordType>();
-  if (!Record)
-    return;
-
-  SourceLocation Loc = getInitializationLoc(Entity, CurInitExpr);
-  if (S.Diags.isIgnored(diag::warn_cxx98_compat_temp_copy, Loc))
-    return;
-
-  // Find constructors which would have been considered.
-  OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
-  DeclContext::lookup_result Ctors =
-      S.LookupConstructors(cast<CXXRecordDecl>(Record->getDecl()));
-
-  // Perform overload resolution.
-  OverloadCandidateSet::iterator Best;
-  OverloadingResult OR = ResolveConstructorOverload(
-      S, Loc, CurInitExpr, CandidateSet, CurInitExpr->getType(), Ctors, Best,
-      /*CopyInitializing=*/false, /*AllowExplicit=*/true,
-      /*OnlyListConstructors=*/false, /*IsListInit=*/false,
-      /*SecondStepOfCopyInit=*/true);
-
-  PartialDiagnostic Diag = S.PDiag(diag::warn_cxx98_compat_temp_copy)
-    << OR << (int)Entity.getKind() << CurInitExpr->getType()
-    << CurInitExpr->getSourceRange();
-
-  switch (OR) {
-  case OR_Success:
-    S.CheckConstructorAccess(Loc, cast<CXXConstructorDecl>(Best->Function),
-                             Best->FoundDecl, Entity, Diag);
-    // FIXME: Check default arguments as far as that's possible.
-    break;
-
-  case OR_No_Viable_Function:
-    S.Diag(Loc, Diag);
-    CandidateSet.NoteCandidates(S, OCD_AllCandidates, CurInitExpr);
-    break;
-
-  case OR_Ambiguous:
-    S.Diag(Loc, Diag);
-    CandidateSet.NoteCandidates(S, OCD_ViableCandidates, CurInitExpr);
-    break;
-
-  case OR_Deleted:
-    S.Diag(Loc, Diag);
-    S.NoteDeletedFunction(Best->Function);
-    break;
-  }
-}
-
-void InitializationSequence::PrintInitLocationNote(Sema &S,
-                                              const InitializedEntity &Entity) {
-  if (Entity.isParameterKind() && Entity.getDecl()) {
-    if (Entity.getDecl()->getLocation().isInvalid())
-      return;
-
-    if (Entity.getDecl()->getDeclName())
-      S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_named_here)
-        << Entity.getDecl()->getDeclName();
-    else
-      S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_here);
-  }
-  else if (Entity.getKind() == InitializedEntity::EK_RelatedResult &&
-           Entity.getMethodDecl())
-    S.Diag(Entity.getMethodDecl()->getLocation(),
-           diag::note_method_return_type_change)
-      << Entity.getMethodDecl()->getDeclName();
-}
-
-/// Returns true if the parameters describe a constructor initialization of
-/// an explicit temporary object, e.g. "Point(x, y)".
-static bool isExplicitTemporary(const InitializedEntity &Entity,
-                                const InitializationKind &Kind,
-                                unsigned NumArgs) {
-  switch (Entity.getKind()) {
-  case InitializedEntity::EK_Temporary:
-  case InitializedEntity::EK_CompoundLiteralInit:
-  case InitializedEntity::EK_RelatedResult:
-    break;
-  default:
-    return false;
-  }
-
-  switch (Kind.getKind()) {
-  case InitializationKind::IK_DirectList:
-    return true;
-  // FIXME: Hack to work around cast weirdness.
-  case InitializationKind::IK_Direct:
-  case InitializationKind::IK_Value:
-    return NumArgs != 1;
-  default:
-    return false;
-  }
-}
-
-static ExprResult
-PerformConstructorInitialization(Sema &S,
-                                 const InitializedEntity &Entity,
-                                 const InitializationKind &Kind,
-                                 MultiExprArg Args,
-                                 const InitializationSequence::Step& Step,
-                                 bool &ConstructorInitRequiresZeroInit,
-                                 bool IsListInitialization,
-                                 bool IsStdInitListInitialization,
-                                 SourceLocation LBraceLoc,
-                                 SourceLocation RBraceLoc) {
-  unsigned NumArgs = Args.size();
-  CXXConstructorDecl *Constructor
-    = cast<CXXConstructorDecl>(Step.Function.Function);
-  bool HadMultipleCandidates = Step.Function.HadMultipleCandidates;
-
-  // Build a call to the selected constructor.
-  SmallVector<Expr*, 8> ConstructorArgs;
-  SourceLocation Loc = (Kind.isCopyInit() && Kind.getEqualLoc().isValid())
-                         ? Kind.getEqualLoc()
-                         : Kind.getLocation();
-
-  if (Kind.getKind() == InitializationKind::IK_Default) {
-    // Force even a trivial, implicit default constructor to be
-    // semantically checked. We do this explicitly because we don't build
-    // the definition for completely trivial constructors.
-    assert(Constructor->getParent() && "No parent class for constructor.");
-    if (Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
-        Constructor->isTrivial() && !Constructor->isUsed(false))
-      S.DefineImplicitDefaultConstructor(Loc, Constructor);
-  }
-
-  ExprResult CurInit((Expr *)nullptr);
-
-  // C++ [over.match.copy]p1:
-  //   - When initializing a temporary to be bound to the first parameter
-  //     of a constructor that takes a reference to possibly cv-qualified
-  //     T as its first argument, called with a single argument in the
-  //     context of direct-initialization, explicit conversion functions
-  //     are also considered.
-  bool AllowExplicitConv =
-      Kind.AllowExplicit() && !Kind.isCopyInit() && Args.size() == 1 &&
-      hasCopyOrMoveCtorParam(S.Context,
-                             getConstructorInfo(Step.Function.FoundDecl));
-
-  // Determine the arguments required to actually perform the constructor
-  // call.
-  if (S.CompleteConstructorCall(Constructor, Args,
-                                Loc, ConstructorArgs,
-                                AllowExplicitConv,
-                                IsListInitialization))
-    return ExprError();
-
-
-  if (isExplicitTemporary(Entity, Kind, NumArgs)) {
-    // An explicitly-constructed temporary, e.g., X(1, 2).
-    if (S.DiagnoseUseOfDecl(Constructor, Loc))
-      return ExprError();
-
-    TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
-    if (!TSInfo)
-      TSInfo = S.Context.getTrivialTypeSourceInfo(Entity.getType(), Loc);
-    SourceRange ParenOrBraceRange =
-        (Kind.getKind() == InitializationKind::IK_DirectList)
-        ? SourceRange(LBraceLoc, RBraceLoc)
-        : Kind.getParenOrBraceRange();
-
-    if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(
-            Step.Function.FoundDecl.getDecl())) {
-      Constructor = S.findInheritingConstructor(Loc, Constructor, Shadow);
-      if (S.DiagnoseUseOfDecl(Constructor, Loc))
-        return ExprError();
-    }
-    S.MarkFunctionReferenced(Loc, Constructor);
-
-    CurInit = CXXTemporaryObjectExpr::Create(
-        S.Context, Constructor,
-        Entity.getType().getNonLValueExprType(S.Context), TSInfo,
-        ConstructorArgs, ParenOrBraceRange, HadMultipleCandidates,
-        IsListInitialization, IsStdInitListInitialization,
-        ConstructorInitRequiresZeroInit);
-  } else {
-    CXXConstructExpr::ConstructionKind ConstructKind =
-      CXXConstructExpr::CK_Complete;
-
-    if (Entity.getKind() == InitializedEntity::EK_Base) {
-      ConstructKind = Entity.getBaseSpecifier()->isVirtual() ?
-        CXXConstructExpr::CK_VirtualBase :
-        CXXConstructExpr::CK_NonVirtualBase;
-    } else if (Entity.getKind() == InitializedEntity::EK_Delegating) {
-      ConstructKind = CXXConstructExpr::CK_Delegating;
-    }
-
-    // Only get the parenthesis or brace range if it is a list initialization or
-    // direct construction.
-    SourceRange ParenOrBraceRange;
-    if (IsListInitialization)
-      ParenOrBraceRange = SourceRange(LBraceLoc, RBraceLoc);
-    else if (Kind.getKind() == InitializationKind::IK_Direct)
-      ParenOrBraceRange = Kind.getParenOrBraceRange();
-
-    // If the entity allows NRVO, mark the construction as elidable
-    // unconditionally.
-    if (Entity.allowsNRVO())
-      CurInit = S.BuildCXXConstructExpr(Loc, Step.Type,
-                                        Step.Function.FoundDecl,
-                                        Constructor, /*Elidable=*/true,
-                                        ConstructorArgs,
-                                        HadMultipleCandidates,
-                                        IsListInitialization,
-                                        IsStdInitListInitialization,
-                                        ConstructorInitRequiresZeroInit,
-                                        ConstructKind,
-                                        ParenOrBraceRange);
-    else
-      CurInit = S.BuildCXXConstructExpr(Loc, Step.Type,
-                                        Step.Function.FoundDecl,
-                                        Constructor,
-                                        ConstructorArgs,
-                                        HadMultipleCandidates,
-                                        IsListInitialization,
-                                        IsStdInitListInitialization,
-                                        ConstructorInitRequiresZeroInit,
-                                        ConstructKind,
-                                        ParenOrBraceRange);
-  }
-  if (CurInit.isInvalid())
-    return ExprError();
-
-  // Only check access if all of that succeeded.
-  S.CheckConstructorAccess(Loc, Constructor, Step.Function.FoundDecl, Entity);
-  if (S.DiagnoseUseOfDecl(Step.Function.FoundDecl, Loc))
-    return ExprError();
-
-  if (shouldBindAsTemporary(Entity))
-    CurInit = S.MaybeBindToTemporary(CurInit.get());
-
-  return CurInit;
-}
-
-namespace {
-enum LifetimeKind {
-  /// The lifetime of a temporary bound to this entity ends at the end of the
-  /// full-expression, and that's (probably) fine.
-  LK_FullExpression,
-
-  /// The lifetime of a temporary bound to this entity is extended to the
-  /// lifeitme of the entity itself.
-  LK_Extended,
-
-  /// The lifetime of a temporary bound to this entity probably ends too soon,
-  /// because the entity is allocated in a new-expression.
-  LK_New,
-
-  /// The lifetime of a temporary bound to this entity ends too soon, because
-  /// the entity is a return object.
-  LK_Return,
-
-  /// The lifetime of a temporary bound to this entity ends too soon, because
-  /// the entity is the result of a statement expression.
-  LK_StmtExprResult,
-
-  /// This is a mem-initializer: if it would extend a temporary (other than via
-  /// a default member initializer), the program is ill-formed.
-  LK_MemInitializer,
-};
-using LifetimeResult =
-    llvm::PointerIntPair<const InitializedEntity *, 3, LifetimeKind>;
-}
-
-/// Determine the declaration which an initialized entity ultimately refers to,
-/// for the purpose of lifetime-extending a temporary bound to a reference in
-/// the initialization of \p Entity.
-static LifetimeResult getEntityLifetime(
-    const InitializedEntity *Entity,
-    const InitializedEntity *InitField = nullptr) {
-  // C++11 [class.temporary]p5:
-  switch (Entity->getKind()) {
-  case InitializedEntity::EK_Variable:
-    //   The temporary [...] persists for the lifetime of the reference
-    return {Entity, LK_Extended};
-
-  case InitializedEntity::EK_Member:
-    // For subobjects, we look at the complete object.
-    if (Entity->getParent())
-      return getEntityLifetime(Entity->getParent(), Entity);
-
-    //   except:
-    // C++17 [class.base.init]p8:
-    //   A temporary expression bound to a reference member in a
-    //   mem-initializer is ill-formed.
-    // C++17 [class.base.init]p11:
-    //   A temporary expression bound to a reference member from a
-    //   default member initializer is ill-formed.
-    //
-    // The context of p11 and its example suggest that it's only the use of a
-    // default member initializer from a constructor that makes the program
-    // ill-formed, not its mere existence, and that it can even be used by
-    // aggregate initialization.
-    return {Entity, Entity->isDefaultMemberInitializer() ? LK_Extended
-                                                         : LK_MemInitializer};
-
-  case InitializedEntity::EK_Binding:
-    // Per [dcl.decomp]p3, the binding is treated as a variable of reference
-    // type.
-    return {Entity, LK_Extended};
-
-  case InitializedEntity::EK_Parameter:
-  case InitializedEntity::EK_Parameter_CF_Audited:
-    //   -- A temporary bound to a reference parameter in a function call
-    //      persists until the completion of the full-expression containing
-    //      the call.
-    return {nullptr, LK_FullExpression};
-
-  case InitializedEntity::EK_Result:
-    //   -- The lifetime of a temporary bound to the returned value in a
-    //      function return statement is not extended; the temporary is
-    //      destroyed at the end of the full-expression in the return statement.
-    return {nullptr, LK_Return};
-
-  case InitializedEntity::EK_StmtExprResult:
-    // FIXME: Should we lifetime-extend through the result of a statement
-    // expression?
-    return {nullptr, LK_StmtExprResult};
-
-  case InitializedEntity::EK_New:
-    //   -- A temporary bound to a reference in a new-initializer persists
-    //      until the completion of the full-expression containing the
-    //      new-initializer.
-    return {nullptr, LK_New};
-
-  case InitializedEntity::EK_Temporary:
-  case InitializedEntity::EK_CompoundLiteralInit:
-  case InitializedEntity::EK_RelatedResult:
-    // We don't yet know the storage duration of the surrounding temporary.
-    // Assume it's got full-expression duration for now, it will patch up our
-    // storage duration if that's not correct.
-    return {nullptr, LK_FullExpression};
-
-  case InitializedEntity::EK_ArrayElement:
-    // For subobjects, we look at the complete object.
-    return getEntityLifetime(Entity->getParent(), InitField);
-
-  case InitializedEntity::EK_Base:
-    // For subobjects, we look at the complete object.
-    if (Entity->getParent())
-      return getEntityLifetime(Entity->getParent(), InitField);
-    return {InitField, LK_MemInitializer};
-
-  case InitializedEntity::EK_Delegating:
-    // We can reach this case for aggregate initialization in a constructor:
-    //   struct A { int &&r; };
-    //   struct B : A { B() : A{0} {} };
-    // In this case, use the outermost field decl as the context.
-    return {InitField, LK_MemInitializer};
-
-  case InitializedEntity::EK_BlockElement:
-  case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
-  case InitializedEntity::EK_LambdaCapture:
-  case InitializedEntity::EK_VectorElement:
-  case InitializedEntity::EK_ComplexElement:
-    return {nullptr, LK_FullExpression};
-
-  case InitializedEntity::EK_Exception:
-    // FIXME: Can we diagnose lifetime problems with exceptions?
-    return {nullptr, LK_FullExpression};
-  }
-  llvm_unreachable("unknown entity kind");
-}
-
-namespace {
-enum ReferenceKind {
-  /// Lifetime would be extended by a reference binding to a temporary.
-  RK_ReferenceBinding,
-  /// Lifetime would be extended by a std::initializer_list object binding to
-  /// its backing array.
-  RK_StdInitializerList,
-};
-
-/// A temporary or local variable. This will be one of:
-///  * A MaterializeTemporaryExpr.
-///  * A DeclRefExpr whose declaration is a local.
-///  * An AddrLabelExpr.
-///  * A BlockExpr for a block with captures.
-using Local = Expr*;
-
-/// Expressions we stepped over when looking for the local state. Any steps
-/// that would inhibit lifetime extension or take us out of subexpressions of
-/// the initializer are included.
-struct IndirectLocalPathEntry {
-  enum EntryKind {
-    DefaultInit,
-    AddressOf,
-    VarInit,
-    LValToRVal,
-    LifetimeBoundCall,
-  } Kind;
-  Expr *E;
-  const Decl *D = nullptr;
-  IndirectLocalPathEntry() {}
-  IndirectLocalPathEntry(EntryKind K, Expr *E) : Kind(K), E(E) {}
-  IndirectLocalPathEntry(EntryKind K, Expr *E, const Decl *D)
-      : Kind(K), E(E), D(D) {}
-};
-
-using IndirectLocalPath = llvm::SmallVectorImpl<IndirectLocalPathEntry>;
-
-struct RevertToOldSizeRAII {
-  IndirectLocalPath &Path;
-  unsigned OldSize = Path.size();
-  RevertToOldSizeRAII(IndirectLocalPath &Path) : Path(Path) {}
-  ~RevertToOldSizeRAII() { Path.resize(OldSize); }
-};
-
-using LocalVisitor = llvm::function_ref<bool(IndirectLocalPath &Path, Local L,
-                                             ReferenceKind RK)>;
-}
-
-static bool isVarOnPath(IndirectLocalPath &Path, VarDecl *VD) {
-  for (auto E : Path)
-    if (E.Kind == IndirectLocalPathEntry::VarInit && E.D == VD)
-      return true;
-  return false;
-}
-
-static bool pathContainsInit(IndirectLocalPath &Path) {
-  return llvm::any_of(Path, [=](IndirectLocalPathEntry E) {
-    return E.Kind == IndirectLocalPathEntry::DefaultInit ||
-           E.Kind == IndirectLocalPathEntry::VarInit;
-  });
-}
-
-static void visitLocalsRetainedByInitializer(IndirectLocalPath &Path,
-                                             Expr *Init, LocalVisitor Visit,
-                                             bool RevisitSubinits);
-
-static void visitLocalsRetainedByReferenceBinding(IndirectLocalPath &Path,
-                                                  Expr *Init, ReferenceKind RK,
-                                                  LocalVisitor Visit);
-
-static bool implicitObjectParamIsLifetimeBound(const FunctionDecl *FD) {
-  const TypeSourceInfo *TSI = FD->getTypeSourceInfo();
-  if (!TSI)
-    return false;
-  // Don't declare this variable in the second operand of the for-statement;
-  // GCC miscompiles that by ending its lifetime before evaluating the
-  // third operand. See gcc.gnu.org/PR86769.
-  AttributedTypeLoc ATL;
-  for (TypeLoc TL = TSI->getTypeLoc();
-       (ATL = TL.getAsAdjusted<AttributedTypeLoc>());
-       TL = ATL.getModifiedLoc()) {
-    if (ATL.getAttrAs<LifetimeBoundAttr>())
-      return true;
-  }
-  return false;
-}
-
-static void visitLifetimeBoundArguments(IndirectLocalPath &Path, Expr *Call,
-                                        LocalVisitor Visit) {
-  const FunctionDecl *Callee;
-  ArrayRef<Expr*> Args;
-
-  if (auto *CE = dyn_cast<CallExpr>(Call)) {
-    Callee = CE->getDirectCallee();
-    Args = llvm::makeArrayRef(CE->getArgs(), CE->getNumArgs());
-  } else {
-    auto *CCE = cast<CXXConstructExpr>(Call);
-    Callee = CCE->getConstructor();
-    Args = llvm::makeArrayRef(CCE->getArgs(), CCE->getNumArgs());
-  }
-  if (!Callee)
-    return;
-
-  Expr *ObjectArg = nullptr;
-  if (isa<CXXOperatorCallExpr>(Call) && Callee->isCXXInstanceMember()) {
-    ObjectArg = Args[0];
-    Args = Args.slice(1);
-  } else if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Call)) {
-    ObjectArg = MCE->getImplicitObjectArgument();
-  }
-
-  auto VisitLifetimeBoundArg = [&](const Decl *D, Expr *Arg) {
-    Path.push_back({IndirectLocalPathEntry::LifetimeBoundCall, Arg, D});
-    if (Arg->isGLValue())
-      visitLocalsRetainedByReferenceBinding(Path, Arg, RK_ReferenceBinding,
-                                            Visit);
-    else
-      visitLocalsRetainedByInitializer(Path, Arg, Visit, true);
-    Path.pop_back();
-  };
-
-  if (ObjectArg && implicitObjectParamIsLifetimeBound(Callee))
-    VisitLifetimeBoundArg(Callee, ObjectArg);
-
-  for (unsigned I = 0,
-                N = std::min<unsigned>(Callee->getNumParams(), Args.size());
-       I != N; ++I) {
-    if (Callee->getParamDecl(I)->hasAttr<LifetimeBoundAttr>())
-      VisitLifetimeBoundArg(Callee->getParamDecl(I), Args[I]);
-  }
-}
-
-/// Visit the locals that would be reachable through a reference bound to the
-/// glvalue expression \c Init.
-static void visitLocalsRetainedByReferenceBinding(IndirectLocalPath &Path,
-                                                  Expr *Init, ReferenceKind RK,
-                                                  LocalVisitor Visit) {
-  RevertToOldSizeRAII RAII(Path);
-
-  // Walk past any constructs which we can lifetime-extend across.
-  Expr *Old;
-  do {
-    Old = Init;
-
-    if (auto *FE = dyn_cast<FullExpr>(Init))
-      Init = FE->getSubExpr();
-
-    if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
-      // If this is just redundant braces around an initializer, step over it.
-      if (ILE->isTransparent())
-        Init = ILE->getInit(0);
-    }
-
-    // Step over any subobject adjustments; we may have a materialized
-    // temporary inside them.
-    Init = const_cast<Expr *>(Init->skipRValueSubobjectAdjustments());
-
-    // Per current approach for DR1376, look through casts to reference type
-    // when performing lifetime extension.
-    if (CastExpr *CE = dyn_cast<CastExpr>(Init))
-      if (CE->getSubExpr()->isGLValue())
-        Init = CE->getSubExpr();
-
-    // Per the current approach for DR1299, look through array element access
-    // on array glvalues when performing lifetime extension.
-    if (auto *ASE = dyn_cast<ArraySubscriptExpr>(Init)) {
-      Init = ASE->getBase();
-      auto *ICE = dyn_cast<ImplicitCastExpr>(Init);
-      if (ICE && ICE->getCastKind() == CK_ArrayToPointerDecay)
-        Init = ICE->getSubExpr();
-      else
-        // We can't lifetime extend through this but we might still find some
-        // retained temporaries.
-        return visitLocalsRetainedByInitializer(Path, Init, Visit, true);
-    }
-
-    // Step into CXXDefaultInitExprs so we can diagnose cases where a
-    // constructor inherits one as an implicit mem-initializer.
-    if (auto *DIE = dyn_cast<CXXDefaultInitExpr>(Init)) {
-      Path.push_back(
-          {IndirectLocalPathEntry::DefaultInit, DIE, DIE->getField()});
-      Init = DIE->getExpr();
-    }
-  } while (Init != Old);
-
-  if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Init)) {
-    if (Visit(Path, Local(MTE), RK))
-      visitLocalsRetainedByInitializer(Path, MTE->GetTemporaryExpr(), Visit,
-                                       true);
-  }
-
-  if (isa<CallExpr>(Init))
-    return visitLifetimeBoundArguments(Path, Init, Visit);
-
-  switch (Init->getStmtClass()) {
-  case Stmt::DeclRefExprClass: {
-    // If we find the name of a local non-reference parameter, we could have a
-    // lifetime problem.
-    auto *DRE = cast<DeclRefExpr>(Init);
-    auto *VD = dyn_cast<VarDecl>(DRE->getDecl());
-    if (VD && VD->hasLocalStorage() &&
-        !DRE->refersToEnclosingVariableOrCapture()) {
-      if (!VD->getType()->isReferenceType()) {
-        Visit(Path, Local(DRE), RK);
-      } else if (isa<ParmVarDecl>(DRE->getDecl())) {
-        // The lifetime of a reference parameter is unknown; assume it's OK
-        // for now.
-        break;
-      } else if (VD->getInit() && !isVarOnPath(Path, VD)) {
-        Path.push_back({IndirectLocalPathEntry::VarInit, DRE, VD});
-        visitLocalsRetainedByReferenceBinding(Path, VD->getInit(),
-                                              RK_ReferenceBinding, Visit);
-      }
-    }
-    break;
-  }
-
-  case Stmt::UnaryOperatorClass: {
-    // The only unary operator that make sense to handle here
-    // is Deref.  All others don't resolve to a "name."  This includes
-    // handling all sorts of rvalues passed to a unary operator.
-    const UnaryOperator *U = cast<UnaryOperator>(Init);
-    if (U->getOpcode() == UO_Deref)
-      visitLocalsRetainedByInitializer(Path, U->getSubExpr(), Visit, true);
-    break;
-  }
-
-  case Stmt::OMPArraySectionExprClass: {
-    visitLocalsRetainedByInitializer(
-        Path, cast<OMPArraySectionExpr>(Init)->getBase(), Visit, true);
-    break;
-  }
-
-  case Stmt::ConditionalOperatorClass:
-  case Stmt::BinaryConditionalOperatorClass: {
-    auto *C = cast<AbstractConditionalOperator>(Init);
-    if (!C->getTrueExpr()->getType()->isVoidType())
-      visitLocalsRetainedByReferenceBinding(Path, C->getTrueExpr(), RK, Visit);
-    if (!C->getFalseExpr()->getType()->isVoidType())
-      visitLocalsRetainedByReferenceBinding(Path, C->getFalseExpr(), RK, Visit);
-    break;
-  }
-
-  // FIXME: Visit the left-hand side of an -> or ->*.
-
-  default:
-    break;
-  }
-}
-
-/// Visit the locals that would be reachable through an object initialized by
-/// the prvalue expression \c Init.
-static void visitLocalsRetainedByInitializer(IndirectLocalPath &Path,
-                                             Expr *Init, LocalVisitor Visit,
-                                             bool RevisitSubinits) {
-  RevertToOldSizeRAII RAII(Path);
-
-  Expr *Old;
-  do {
-    Old = Init;
-
-    // Step into CXXDefaultInitExprs so we can diagnose cases where a
-    // constructor inherits one as an implicit mem-initializer.
-    if (auto *DIE = dyn_cast<CXXDefaultInitExpr>(Init)) {
-      Path.push_back({IndirectLocalPathEntry::DefaultInit, DIE, DIE->getField()});
-      Init = DIE->getExpr();
-    }
-
-    if (auto *FE = dyn_cast<FullExpr>(Init))
-      Init = FE->getSubExpr();
-
-    // Dig out the expression which constructs the extended temporary.
-    Init = const_cast<Expr *>(Init->skipRValueSubobjectAdjustments());
-
-    if (CXXBindTemporaryExpr *BTE = dyn_cast<CXXBindTemporaryExpr>(Init))
-      Init = BTE->getSubExpr();
-
-    Init = Init->IgnoreParens();
-
-    // Step over value-preserving rvalue casts.
-    if (auto *CE = dyn_cast<CastExpr>(Init)) {
-      switch (CE->getCastKind()) {
-      case CK_LValueToRValue:
-        // If we can match the lvalue to a const object, we can look at its
-        // initializer.
-        Path.push_back({IndirectLocalPathEntry::LValToRVal, CE});
-        return visitLocalsRetainedByReferenceBinding(
-            Path, Init, RK_ReferenceBinding,
-            [&](IndirectLocalPath &Path, Local L, ReferenceKind RK) -> bool {
-          if (auto *DRE = dyn_cast<DeclRefExpr>(L)) {
-            auto *VD = dyn_cast<VarDecl>(DRE->getDecl());
-            if (VD && VD->getType().isConstQualified() && VD->getInit() &&
-                !isVarOnPath(Path, VD)) {
-              Path.push_back({IndirectLocalPathEntry::VarInit, DRE, VD});
-              visitLocalsRetainedByInitializer(Path, VD->getInit(), Visit, true);
-            }
-          } else if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(L)) {
-            if (MTE->getType().isConstQualified())
-              visitLocalsRetainedByInitializer(Path, MTE->GetTemporaryExpr(),
-                                               Visit, true);
-          }
-          return false;
-        });
-
-        // We assume that objects can be retained by pointers cast to integers,
-        // but not if the integer is cast to floating-point type or to _Complex.
-        // We assume that casts to 'bool' do not preserve enough information to
-        // retain a local object.
-      case CK_NoOp:
-      case CK_BitCast:
-      case CK_BaseToDerived:
-      case CK_DerivedToBase:
-      case CK_UncheckedDerivedToBase:
-      case CK_Dynamic:
-      case CK_ToUnion:
-      case CK_UserDefinedConversion:
-      case CK_ConstructorConversion:
-      case CK_IntegralToPointer:
-      case CK_PointerToIntegral:
-      case CK_VectorSplat:
-      case CK_IntegralCast:
-      case CK_CPointerToObjCPointerCast:
-      case CK_BlockPointerToObjCPointerCast:
-      case CK_AnyPointerToBlockPointerCast:
-      case CK_AddressSpaceConversion:
-        break;
-
-      case CK_ArrayToPointerDecay:
-        // Model array-to-pointer decay as taking the address of the array
-        // lvalue.
-        Path.push_back({IndirectLocalPathEntry::AddressOf, CE});
-        return visitLocalsRetainedByReferenceBinding(Path, CE->getSubExpr(),
-                                                     RK_ReferenceBinding, Visit);
-
-      default:
-        return;
-      }
-
-      Init = CE->getSubExpr();
-    }
-  } while (Old != Init);
-
-  // C++17 [dcl.init.list]p6:
-  //   initializing an initializer_list object from the array extends the
-  //   lifetime of the array exactly like binding a reference to a temporary.
-  if (auto *ILE = dyn_cast<CXXStdInitializerListExpr>(Init))
-    return visitLocalsRetainedByReferenceBinding(Path, ILE->getSubExpr(),
-                                                 RK_StdInitializerList, Visit);
-
-  if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
-    // We already visited the elements of this initializer list while
-    // performing the initialization. Don't visit them again unless we've
-    // changed the lifetime of the initialized entity.
-    if (!RevisitSubinits)
-      return;
-
-    if (ILE->isTransparent())
-      return visitLocalsRetainedByInitializer(Path, ILE->getInit(0), Visit,
-                                              RevisitSubinits);
-
-    if (ILE->getType()->isArrayType()) {
-      for (unsigned I = 0, N = ILE->getNumInits(); I != N; ++I)
-        visitLocalsRetainedByInitializer(Path, ILE->getInit(I), Visit,
-                                         RevisitSubinits);
-      return;
-    }
-
-    if (CXXRecordDecl *RD = ILE->getType()->getAsCXXRecordDecl()) {
-      assert(RD->isAggregate() && "aggregate init on non-aggregate");
-
-      // If we lifetime-extend a braced initializer which is initializing an
-      // aggregate, and that aggregate contains reference members which are
-      // bound to temporaries, those temporaries are also lifetime-extended.
-      if (RD->isUnion() && ILE->getInitializedFieldInUnion() &&
-          ILE->getInitializedFieldInUnion()->getType()->isReferenceType())
-        visitLocalsRetainedByReferenceBinding(Path, ILE->getInit(0),
-                                              RK_ReferenceBinding, Visit);
-      else {
-        unsigned Index = 0;
-        for (const auto *I : RD->fields()) {
-          if (Index >= ILE->getNumInits())
-            break;
-          if (I->isUnnamedBitfield())
-            continue;
-          Expr *SubInit = ILE->getInit(Index);
-          if (I->getType()->isReferenceType())
-            visitLocalsRetainedByReferenceBinding(Path, SubInit,
-                                                  RK_ReferenceBinding, Visit);
-          else
-            // This might be either aggregate-initialization of a member or
-            // initialization of a std::initializer_list object. Regardless,
-            // we should recursively lifetime-extend that initializer.
-            visitLocalsRetainedByInitializer(Path, SubInit, Visit,
-                                             RevisitSubinits);
-          ++Index;
-        }
-      }
-    }
-    return;
-  }
-
-  // The lifetime of an init-capture is that of the closure object constructed
-  // by a lambda-expression.
-  if (auto *LE = dyn_cast<LambdaExpr>(Init)) {
-    for (Expr *E : LE->capture_inits()) {
-      if (!E)
-        continue;
-      if (E->isGLValue())
-        visitLocalsRetainedByReferenceBinding(Path, E, RK_ReferenceBinding,
-                                              Visit);
-      else
-        visitLocalsRetainedByInitializer(Path, E, Visit, true);
-    }
-  }
-
-  if (isa<CallExpr>(Init) || isa<CXXConstructExpr>(Init))
-    return visitLifetimeBoundArguments(Path, Init, Visit);
-
-  switch (Init->getStmtClass()) {
-  case Stmt::UnaryOperatorClass: {
-    auto *UO = cast<UnaryOperator>(Init);
-    // If the initializer is the address of a local, we could have a lifetime
-    // problem.
-    if (UO->getOpcode() == UO_AddrOf) {
-      // If this is &rvalue, then it's ill-formed and we have already diagnosed
-      // it. Don't produce a redundant warning about the lifetime of the
-      // temporary.
-      if (isa<MaterializeTemporaryExpr>(UO->getSubExpr()))
-        return;
-
-      Path.push_back({IndirectLocalPathEntry::AddressOf, UO});
-      visitLocalsRetainedByReferenceBinding(Path, UO->getSubExpr(),
-                                            RK_ReferenceBinding, Visit);
-    }
-    break;
-  }
-
-  case Stmt::BinaryOperatorClass: {
-    // Handle pointer arithmetic.
-    auto *BO = cast<BinaryOperator>(Init);
-    BinaryOperatorKind BOK = BO->getOpcode();
-    if (!BO->getType()->isPointerType() || (BOK != BO_Add && BOK != BO_Sub))
-      break;
-
-    if (BO->getLHS()->getType()->isPointerType())
-      visitLocalsRetainedByInitializer(Path, BO->getLHS(), Visit, true);
-    else if (BO->getRHS()->getType()->isPointerType())
-      visitLocalsRetainedByInitializer(Path, BO->getRHS(), Visit, true);
-    break;
-  }
-
-  case Stmt::ConditionalOperatorClass:
-  case Stmt::BinaryConditionalOperatorClass: {
-    auto *C = cast<AbstractConditionalOperator>(Init);
-    // In C++, we can have a throw-expression operand, which has 'void' type
-    // and isn't interesting from a lifetime perspective.
-    if (!C->getTrueExpr()->getType()->isVoidType())
-      visitLocalsRetainedByInitializer(Path, C->getTrueExpr(), Visit, true);
-    if (!C->getFalseExpr()->getType()->isVoidType())
-      visitLocalsRetainedByInitializer(Path, C->getFalseExpr(), Visit, true);
-    break;
-  }
-
-  case Stmt::BlockExprClass:
-    if (cast<BlockExpr>(Init)->getBlockDecl()->hasCaptures()) {
-      // This is a local block, whose lifetime is that of the function.
-      Visit(Path, Local(cast<BlockExpr>(Init)), RK_ReferenceBinding);
-    }
-    break;
-
-  case Stmt::AddrLabelExprClass:
-    // We want to warn if the address of a label would escape the function.
-    Visit(Path, Local(cast<AddrLabelExpr>(Init)), RK_ReferenceBinding);
-    break;
-
-  default:
-    break;
-  }
-}
-
-/// Determine whether this is an indirect path to a temporary that we are
-/// supposed to lifetime-extend along (but don't).
-static bool shouldLifetimeExtendThroughPath(const IndirectLocalPath &Path) {
-  for (auto Elem : Path) {
-    if (Elem.Kind != IndirectLocalPathEntry::DefaultInit)
-      return false;
-  }
-  return true;
-}
-
-/// Find the range for the first interesting entry in the path at or after I.
-static SourceRange nextPathEntryRange(const IndirectLocalPath &Path, unsigned I,
-                                      Expr *E) {
-  for (unsigned N = Path.size(); I != N; ++I) {
-    switch (Path[I].Kind) {
-    case IndirectLocalPathEntry::AddressOf:
-    case IndirectLocalPathEntry::LValToRVal:
-    case IndirectLocalPathEntry::LifetimeBoundCall:
-      // These exist primarily to mark the path as not permitting or
-      // supporting lifetime extension.
-      break;
-
-    case IndirectLocalPathEntry::DefaultInit:
-    case IndirectLocalPathEntry::VarInit:
-      return Path[I].E->getSourceRange();
-    }
-  }
-  return E->getSourceRange();
-}
-
-void Sema::checkInitializerLifetime(const InitializedEntity &Entity,
-                                    Expr *Init) {
-  LifetimeResult LR = getEntityLifetime(&Entity);
-  LifetimeKind LK = LR.getInt();
-  const InitializedEntity *ExtendingEntity = LR.getPointer();
-
-  // If this entity doesn't have an interesting lifetime, don't bother looking
-  // for temporaries within its initializer.
-  if (LK == LK_FullExpression)
-    return;
-
-  auto TemporaryVisitor = [&](IndirectLocalPath &Path, Local L,
-                              ReferenceKind RK) -> bool {
-    SourceRange DiagRange = nextPathEntryRange(Path, 0, L);
-    SourceLocation DiagLoc = DiagRange.getBegin();
-
-    switch (LK) {
-    case LK_FullExpression:
-      llvm_unreachable("already handled this");
-
-    case LK_Extended: {
-      auto *MTE = dyn_cast<MaterializeTemporaryExpr>(L);
-      if (!MTE) {
-        // The initialized entity has lifetime beyond the full-expression,
-        // and the local entity does too, so don't warn.
-        //
-        // FIXME: We should consider warning if a static / thread storage
-        // duration variable retains an automatic storage duration local.
-        return false;
-      }
-
-      // Lifetime-extend the temporary.
-      if (Path.empty()) {
-        // Update the storage duration of the materialized temporary.
-        // FIXME: Rebuild the expression instead of mutating it.
-        MTE->setExtendingDecl(ExtendingEntity->getDecl(),
-                              ExtendingEntity->allocateManglingNumber());
-        // Also visit the temporaries lifetime-extended by this initializer.
-        return true;
-      }
-
-      if (shouldLifetimeExtendThroughPath(Path)) {
-        // We're supposed to lifetime-extend the temporary along this path (per
-        // the resolution of DR1815), but we don't support that yet.
-        //
-        // FIXME: Properly handle this situation. Perhaps the easiest approach
-        // would be to clone the initializer expression on each use that would
-        // lifetime extend its temporaries.
-        Diag(DiagLoc, diag::warn_unsupported_lifetime_extension)
-            << RK << DiagRange;
-      } else {
-        // If the path goes through the initialization of a variable or field,
-        // it can't possibly reach a temporary created in this full-expression.
-        // We will have already diagnosed any problems with the initializer.
-        if (pathContainsInit(Path))
-          return false;
-
-        Diag(DiagLoc, diag::warn_dangling_variable)
-            << RK << !Entity.getParent()
-            << ExtendingEntity->getDecl()->isImplicit()
-            << ExtendingEntity->getDecl() << Init->isGLValue() << DiagRange;
-      }
-      break;
-    }
-
-    case LK_MemInitializer: {
-      if (isa<MaterializeTemporaryExpr>(L)) {
-        // Under C++ DR1696, if a mem-initializer (or a default member
-        // initializer used by the absence of one) would lifetime-extend a
-        // temporary, the program is ill-formed.
-        if (auto *ExtendingDecl =
-                ExtendingEntity ? ExtendingEntity->getDecl() : nullptr) {
-          bool IsSubobjectMember = ExtendingEntity != &Entity;
-          Diag(DiagLoc, shouldLifetimeExtendThroughPath(Path)
-                            ? diag::err_dangling_member
-                            : diag::warn_dangling_member)
-              << ExtendingDecl << IsSubobjectMember << RK << DiagRange;
-          // Don't bother adding a note pointing to the field if we're inside
-          // its default member initializer; our primary diagnostic points to
-          // the same place in that case.
-          if (Path.empty() ||
-              Path.back().Kind != IndirectLocalPathEntry::DefaultInit) {
-            Diag(ExtendingDecl->getLocation(),
-                 diag::note_lifetime_extending_member_declared_here)
-                << RK << IsSubobjectMember;
-          }
-        } else {
-          // We have a mem-initializer but no particular field within it; this
-          // is either a base class or a delegating initializer directly
-          // initializing the base-class from something that doesn't live long
-          // enough.
-          //
-          // FIXME: Warn on this.
-          return false;
-        }
-      } else {
-        // Paths via a default initializer can only occur during error recovery
-        // (there's no other way that a default initializer can refer to a
-        // local). Don't produce a bogus warning on those cases.
-        if (pathContainsInit(Path))
-          return false;
-
-        auto *DRE = dyn_cast<DeclRefExpr>(L);
-        auto *VD = DRE ? dyn_cast<VarDecl>(DRE->getDecl()) : nullptr;
-        if (!VD) {
-          // A member was initialized to a local block.
-          // FIXME: Warn on this.
-          return false;
-        }
-
-        if (auto *Member =
-                ExtendingEntity ? ExtendingEntity->getDecl() : nullptr) {
-          bool IsPointer = Member->getType()->isAnyPointerType();
-          Diag(DiagLoc, IsPointer ? diag::warn_init_ptr_member_to_parameter_addr
-                                  : diag::warn_bind_ref_member_to_parameter)
-              << Member << VD << isa<ParmVarDecl>(VD) << DiagRange;
-          Diag(Member->getLocation(),
-               diag::note_ref_or_ptr_member_declared_here)
-              << (unsigned)IsPointer;
-        }
-      }
-      break;
-    }
-
-    case LK_New:
-      if (isa<MaterializeTemporaryExpr>(L)) {
-        Diag(DiagLoc, RK == RK_ReferenceBinding
-                          ? diag::warn_new_dangling_reference
-                          : diag::warn_new_dangling_initializer_list)
-            << !Entity.getParent() << DiagRange;
-      } else {
-        // We can't determine if the allocation outlives the local declaration.
-        return false;
-      }
-      break;
-
-    case LK_Return:
-    case LK_StmtExprResult:
-      if (auto *DRE = dyn_cast<DeclRefExpr>(L)) {
-        // We can't determine if the local variable outlives the statement
-        // expression.
-        if (LK == LK_StmtExprResult)
-          return false;
-        Diag(DiagLoc, diag::warn_ret_stack_addr_ref)
-            << Entity.getType()->isReferenceType() << DRE->getDecl()
-            << isa<ParmVarDecl>(DRE->getDecl()) << DiagRange;
-      } else if (isa<BlockExpr>(L)) {
-        Diag(DiagLoc, diag::err_ret_local_block) << DiagRange;
-      } else if (isa<AddrLabelExpr>(L)) {
-        // Don't warn when returning a label from a statement expression.
-        // Leaving the scope doesn't end its lifetime.
-        if (LK == LK_StmtExprResult)
-          return false;
-        Diag(DiagLoc, diag::warn_ret_addr_label) << DiagRange;
-      } else {
-        Diag(DiagLoc, diag::warn_ret_local_temp_addr_ref)
-         << Entity.getType()->isReferenceType() << DiagRange;
-      }
-      break;
-    }
-
-    for (unsigned I = 0; I != Path.size(); ++I) {
-      auto Elem = Path[I];
-
-      switch (Elem.Kind) {
-      case IndirectLocalPathEntry::AddressOf:
-      case IndirectLocalPathEntry::LValToRVal:
-        // These exist primarily to mark the path as not permitting or
-        // supporting lifetime extension.
-        break;
-
-      case IndirectLocalPathEntry::LifetimeBoundCall:
-        // FIXME: Consider adding a note for this.
-        break;
-
-      case IndirectLocalPathEntry::DefaultInit: {
-        auto *FD = cast<FieldDecl>(Elem.D);
-        Diag(FD->getLocation(), diag::note_init_with_default_member_initalizer)
-            << FD << nextPathEntryRange(Path, I + 1, L);
-        break;
-      }
-
-      case IndirectLocalPathEntry::VarInit:
-        const VarDecl *VD = cast<VarDecl>(Elem.D);
-        Diag(VD->getLocation(), diag::note_local_var_initializer)
-            << VD->getType()->isReferenceType()
-            << VD->isImplicit() << VD->getDeclName()
-            << nextPathEntryRange(Path, I + 1, L);
-        break;
-      }
-    }
-
-    // We didn't lifetime-extend, so don't go any further; we don't need more
-    // warnings or errors on inner temporaries within this one's initializer.
-    return false;
-  };
-
-  llvm::SmallVector<IndirectLocalPathEntry, 8> Path;
-  if (Init->isGLValue())
-    visitLocalsRetainedByReferenceBinding(Path, Init, RK_ReferenceBinding,
-                                          TemporaryVisitor);
-  else
-    visitLocalsRetainedByInitializer(Path, Init, TemporaryVisitor, false);
-}
-
-static void DiagnoseNarrowingInInitList(Sema &S,
-                                        const ImplicitConversionSequence &ICS,
-                                        QualType PreNarrowingType,
-                                        QualType EntityType,
-                                        const Expr *PostInit);
-
-/// Provide warnings when std::move is used on construction.
-static void CheckMoveOnConstruction(Sema &S, const Expr *InitExpr,
-                                    bool IsReturnStmt) {
-  if (!InitExpr)
-    return;
-
-  if (S.inTemplateInstantiation())
-    return;
-
-  QualType DestType = InitExpr->getType();
-  if (!DestType->isRecordType())
-    return;
-
-  unsigned DiagID = 0;
-  if (IsReturnStmt) {
-    const CXXConstructExpr *CCE =
-        dyn_cast<CXXConstructExpr>(InitExpr->IgnoreParens());
-    if (!CCE || CCE->getNumArgs() != 1)
-      return;
-
-    if (!CCE->getConstructor()->isCopyOrMoveConstructor())
-      return;
-
-    InitExpr = CCE->getArg(0)->IgnoreImpCasts();
-  }
-
-  // Find the std::move call and get the argument.
-  const CallExpr *CE = dyn_cast<CallExpr>(InitExpr->IgnoreParens());
-  if (!CE || !CE->isCallToStdMove())
-    return;
-
-  const Expr *Arg = CE->getArg(0)->IgnoreImplicit();
-
-  if (IsReturnStmt) {
-    const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg->IgnoreParenImpCasts());
-    if (!DRE || DRE->refersToEnclosingVariableOrCapture())
-      return;
-
-    const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl());
-    if (!VD || !VD->hasLocalStorage())
-      return;
-
-    // __block variables are not moved implicitly.
-    if (VD->hasAttr<BlocksAttr>())
-      return;
-
-    QualType SourceType = VD->getType();
-    if (!SourceType->isRecordType())
-      return;
-
-    if (!S.Context.hasSameUnqualifiedType(DestType, SourceType)) {
-      return;
-    }
-
-    // If we're returning a function parameter, copy elision
-    // is not possible.
-    if (isa<ParmVarDecl>(VD))
-      DiagID = diag::warn_redundant_move_on_return;
-    else
-      DiagID = diag::warn_pessimizing_move_on_return;
-  } else {
-    DiagID = diag::warn_pessimizing_move_on_initialization;
-    const Expr *ArgStripped = Arg->IgnoreImplicit()->IgnoreParens();
-    if (!ArgStripped->isRValue() || !ArgStripped->getType()->isRecordType())
-      return;
-  }
-
-  S.Diag(CE->getBeginLoc(), DiagID);
-
-  // Get all the locations for a fix-it.  Don't emit the fix-it if any location
-  // is within a macro.
-  SourceLocation CallBegin = CE->getCallee()->getBeginLoc();
-  if (CallBegin.isMacroID())
-    return;
-  SourceLocation RParen = CE->getRParenLoc();
-  if (RParen.isMacroID())
-    return;
-  SourceLocation LParen;
-  SourceLocation ArgLoc = Arg->getBeginLoc();
-
-  // Special testing for the argument location.  Since the fix-it needs the
-  // location right before the argument, the argument location can be in a
-  // macro only if it is at the beginning of the macro.
-  while (ArgLoc.isMacroID() &&
-         S.getSourceManager().isAtStartOfImmediateMacroExpansion(ArgLoc)) {
-    ArgLoc = S.getSourceManager().getImmediateExpansionRange(ArgLoc).getBegin();
-  }
-
-  if (LParen.isMacroID())
-    return;
-
-  LParen = ArgLoc.getLocWithOffset(-1);
-
-  S.Diag(CE->getBeginLoc(), diag::note_remove_move)
-      << FixItHint::CreateRemoval(SourceRange(CallBegin, LParen))
-      << FixItHint::CreateRemoval(SourceRange(RParen, RParen));
-}
-
-static void CheckForNullPointerDereference(Sema &S, const Expr *E) {
-  // Check to see if we are dereferencing a null pointer.  If so, this is
-  // undefined behavior, so warn about it.  This only handles the pattern
-  // "*null", which is a very syntactic check.
-  if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
-    if (UO->getOpcode() == UO_Deref &&
-        UO->getSubExpr()->IgnoreParenCasts()->
-        isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull)) {
-    S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
-                          S.PDiag(diag::warn_binding_null_to_reference)
-                            << UO->getSubExpr()->getSourceRange());
-  }
-}
-
-MaterializeTemporaryExpr *
-Sema::CreateMaterializeTemporaryExpr(QualType T, Expr *Temporary,
-                                     bool BoundToLvalueReference) {
-  auto MTE = new (Context)
-      MaterializeTemporaryExpr(T, Temporary, BoundToLvalueReference);
-
-  // Order an ExprWithCleanups for lifetime marks.
-  //
-  // TODO: It'll be good to have a single place to check the access of the
-  // destructor and generate ExprWithCleanups for various uses. Currently these
-  // are done in both CreateMaterializeTemporaryExpr and MaybeBindToTemporary,
-  // but there may be a chance to merge them.
-  Cleanup.setExprNeedsCleanups(false);
-  return MTE;
-}
-
-ExprResult Sema::TemporaryMaterializationConversion(Expr *E) {
-  // In C++98, we don't want to implicitly create an xvalue.
-  // FIXME: This means that AST consumers need to deal with "prvalues" that
-  // denote materialized temporaries. Maybe we should add another ValueKind
-  // for "xvalue pretending to be a prvalue" for C++98 support.
-  if (!E->isRValue() || !getLangOpts().CPlusPlus11)
-    return E;
-
-  // C++1z [conv.rval]/1: T shall be a complete type.
-  // FIXME: Does this ever matter (can we form a prvalue of incomplete type)?
-  // If so, we should check for a non-abstract class type here too.
-  QualType T = E->getType();
-  if (RequireCompleteType(E->getExprLoc(), T, diag::err_incomplete_type))
-    return ExprError();
-
-  return CreateMaterializeTemporaryExpr(E->getType(), E, false);
-}
-
-ExprResult Sema::PerformQualificationConversion(Expr *E, QualType Ty,
-                                                ExprValueKind VK,
-                                                CheckedConversionKind CCK) {
-  CastKind CK = (Ty.getAddressSpace() != E->getType().getAddressSpace())
-                    ? CK_AddressSpaceConversion
-                    : CK_NoOp;
-  return ImpCastExprToType(E, Ty, CK, VK, /*BasePath=*/nullptr, CCK);
-}
-
-ExprResult InitializationSequence::Perform(Sema &S,
-                                           const InitializedEntity &Entity,
-                                           const InitializationKind &Kind,
-                                           MultiExprArg Args,
-                                           QualType *ResultType) {
-  if (Failed()) {
-    Diagnose(S, Entity, Kind, Args);
-    return ExprError();
-  }
-  if (!ZeroInitializationFixit.empty()) {
-    unsigned DiagID = diag::err_default_init_const;
-    if (Decl *D = Entity.getDecl())
-      if (S.getLangOpts().MSVCCompat && D->hasAttr<SelectAnyAttr>())
-        DiagID = diag::ext_default_init_const;
-
-    // The initialization would have succeeded with this fixit. Since the fixit
-    // is on the error, we need to build a valid AST in this case, so this isn't
-    // handled in the Failed() branch above.
-    QualType DestType = Entity.getType();
-    S.Diag(Kind.getLocation(), DiagID)
-        << DestType << (bool)DestType->getAs<RecordType>()
-        << FixItHint::CreateInsertion(ZeroInitializationFixitLoc,
-                                      ZeroInitializationFixit);
-  }
-
-  if (getKind() == DependentSequence) {
-    // If the declaration is a non-dependent, incomplete array type
-    // that has an initializer, then its type will be completed once
-    // the initializer is instantiated.
-    if (ResultType && !Entity.getType()->isDependentType() &&
-        Args.size() == 1) {
-      QualType DeclType = Entity.getType();
-      if (const IncompleteArrayType *ArrayT
-                           = S.Context.getAsIncompleteArrayType(DeclType)) {
-        // FIXME: We don't currently have the ability to accurately
-        // compute the length of an initializer list without
-        // performing full type-checking of the initializer list
-        // (since we have to determine where braces are implicitly
-        // introduced and such).  So, we fall back to making the array
-        // type a dependently-sized array type with no specified
-        // bound.
-        if (isa<InitListExpr>((Expr *)Args[0])) {
-          SourceRange Brackets;
-
-          // Scavange the location of the brackets from the entity, if we can.
-          if (auto *DD = dyn_cast_or_null<DeclaratorDecl>(Entity.getDecl())) {
-            if (TypeSourceInfo *TInfo = DD->getTypeSourceInfo()) {
-              TypeLoc TL = TInfo->getTypeLoc();
-              if (IncompleteArrayTypeLoc ArrayLoc =
-                      TL.getAs<IncompleteArrayTypeLoc>())
-                Brackets = ArrayLoc.getBracketsRange();
-            }
-          }
-
-          *ResultType
-            = S.Context.getDependentSizedArrayType(ArrayT->getElementType(),
-                                                   /*NumElts=*/nullptr,
-                                                   ArrayT->getSizeModifier(),
-                                       ArrayT->getIndexTypeCVRQualifiers(),
-                                                   Brackets);
-        }
-
-      }
-    }
-    if (Kind.getKind() == InitializationKind::IK_Direct &&
-        !Kind.isExplicitCast()) {
-      // Rebuild the ParenListExpr.
-      SourceRange ParenRange = Kind.getParenOrBraceRange();
-      return S.ActOnParenListExpr(ParenRange.getBegin(), ParenRange.getEnd(),
-                                  Args);
-    }
-    assert(Kind.getKind() == InitializationKind::IK_Copy ||
-           Kind.isExplicitCast() ||
-           Kind.getKind() == InitializationKind::IK_DirectList);
-    return ExprResult(Args[0]);
-  }
-
-  // No steps means no initialization.
-  if (Steps.empty())
-    return ExprResult((Expr *)nullptr);
-
-  if (S.getLangOpts().CPlusPlus11 && Entity.getType()->isReferenceType() &&
-      Args.size() == 1 && isa<InitListExpr>(Args[0]) &&
-      !Entity.isParameterKind()) {
-    // Produce a C++98 compatibility warning if we are initializing a reference
-    // from an initializer list. For parameters, we produce a better warning
-    // elsewhere.
-    Expr *Init = Args[0];
-    S.Diag(Init->getBeginLoc(), diag::warn_cxx98_compat_reference_list_init)
-        << Init->getSourceRange();
-  }
-
-  // OpenCL v2.0 s6.13.11.1. atomic variables can be initialized in global scope
-  QualType ETy = Entity.getType();
-  Qualifiers TyQualifiers = ETy.getQualifiers();
-  bool HasGlobalAS = TyQualifiers.hasAddressSpace() &&
-                     TyQualifiers.getAddressSpace() == LangAS::opencl_global;
-
-  if (S.getLangOpts().OpenCLVersion >= 200 &&
-      ETy->isAtomicType() && !HasGlobalAS &&
-      Entity.getKind() == InitializedEntity::EK_Variable && Args.size() > 0) {
-    S.Diag(Args[0]->getBeginLoc(), diag::err_opencl_atomic_init)
-        << 1
-        << SourceRange(Entity.getDecl()->getBeginLoc(), Args[0]->getEndLoc());
-    return ExprError();
-  }
-
-  QualType DestType = Entity.getType().getNonReferenceType();
-  // FIXME: Ugly hack around the fact that Entity.getType() is not
-  // the same as Entity.getDecl()->getType() in cases involving type merging,
-  //  and we want latter when it makes sense.
-  if (ResultType)
-    *ResultType = Entity.getDecl() ? Entity.getDecl()->getType() :
-                                     Entity.getType();
-
-  ExprResult CurInit((Expr *)nullptr);
-  SmallVector<Expr*, 4> ArrayLoopCommonExprs;
-
-  // For initialization steps that start with a single initializer,
-  // grab the only argument out the Args and place it into the "current"
-  // initializer.
-  switch (Steps.front().Kind) {
-  case SK_ResolveAddressOfOverloadedFunction:
-  case SK_CastDerivedToBaseRValue:
-  case SK_CastDerivedToBaseXValue:
-  case SK_CastDerivedToBaseLValue:
-  case SK_BindReference:
-  case SK_BindReferenceToTemporary:
-  case SK_FinalCopy:
-  case SK_ExtraneousCopyToTemporary:
-  case SK_UserConversion:
-  case SK_QualificationConversionLValue:
-  case SK_QualificationConversionXValue:
-  case SK_QualificationConversionRValue:
-  case SK_AtomicConversion:
-  case SK_LValueToRValue:
-  case SK_ConversionSequence:
-  case SK_ConversionSequenceNoNarrowing:
-  case SK_ListInitialization:
-  case SK_UnwrapInitList:
-  case SK_RewrapInitList:
-  case SK_CAssignment:
-  case SK_StringInit:
-  case SK_ObjCObjectConversion:
-  case SK_ArrayLoopIndex:
-  case SK_ArrayLoopInit:
-  case SK_ArrayInit:
-  case SK_GNUArrayInit:
-  case SK_ParenthesizedArrayInit:
-  case SK_PassByIndirectCopyRestore:
-  case SK_PassByIndirectRestore:
-  case SK_ProduceObjCObject:
-  case SK_StdInitializerList:
-  case SK_OCLSamplerInit:
-  case SK_OCLZeroOpaqueType: {
-    assert(Args.size() == 1);
-    CurInit = Args[0];
-    if (!CurInit.get()) return ExprError();
-    break;
-  }
-
-  case SK_ConstructorInitialization:
-  case SK_ConstructorInitializationFromList:
-  case SK_StdInitializerListConstructorCall:
-  case SK_ZeroInitialization:
-    break;
-  }
-
-  // Promote from an unevaluated context to an unevaluated list context in
-  // C++11 list-initialization; we need to instantiate entities usable in
-  // constant expressions here in order to perform narrowing checks =(
-  EnterExpressionEvaluationContext Evaluated(
-      S, EnterExpressionEvaluationContext::InitList,
-      CurInit.get() && isa<InitListExpr>(CurInit.get()));
-
-  // C++ [class.abstract]p2:
-  //   no objects of an abstract class can be created except as subobjects
-  //   of a class derived from it
-  auto checkAbstractType = [&](QualType T) -> bool {
-    if (Entity.getKind() == InitializedEntity::EK_Base ||
-        Entity.getKind() == InitializedEntity::EK_Delegating)
-      return false;
-    return S.RequireNonAbstractType(Kind.getLocation(), T,
-                                    diag::err_allocation_of_abstract_type);
-  };
-
-  // Walk through the computed steps for the initialization sequence,
-  // performing the specified conversions along the way.
-  bool ConstructorInitRequiresZeroInit = false;
-  for (step_iterator Step = step_begin(), StepEnd = step_end();
-       Step != StepEnd; ++Step) {
-    if (CurInit.isInvalid())
-      return ExprError();
-
-    QualType SourceType = CurInit.get() ? CurInit.get()->getType() : QualType();
-
-    switch (Step->Kind) {
-    case SK_ResolveAddressOfOverloadedFunction:
-      // Overload resolution determined which function invoke; update the
-      // initializer to reflect that choice.
-      S.CheckAddressOfMemberAccess(CurInit.get(), Step->Function.FoundDecl);
-      if (S.DiagnoseUseOfDecl(Step->Function.FoundDecl, Kind.getLocation()))
-        return ExprError();
-      CurInit = S.FixOverloadedFunctionReference(CurInit,
-                                                 Step->Function.FoundDecl,
-                                                 Step->Function.Function);
-      break;
-
-    case SK_CastDerivedToBaseRValue:
-    case SK_CastDerivedToBaseXValue:
-    case SK_CastDerivedToBaseLValue: {
-      // We have a derived-to-base cast that produces either an rvalue or an
-      // lvalue. Perform that cast.
-
-      CXXCastPath BasePath;
-
-      // Casts to inaccessible base classes are allowed with C-style casts.
-      bool IgnoreBaseAccess = Kind.isCStyleOrFunctionalCast();
-      if (S.CheckDerivedToBaseConversion(
-              SourceType, Step->Type, CurInit.get()->getBeginLoc(),
-              CurInit.get()->getSourceRange(), &BasePath, IgnoreBaseAccess))
-        return ExprError();
-
-      ExprValueKind VK =
-          Step->Kind == SK_CastDerivedToBaseLValue ?
-              VK_LValue :
-              (Step->Kind == SK_CastDerivedToBaseXValue ?
-                   VK_XValue :
-                   VK_RValue);
-      CurInit =
-          ImplicitCastExpr::Create(S.Context, Step->Type, CK_DerivedToBase,
-                                   CurInit.get(), &BasePath, VK);
-      break;
-    }
-
-    case SK_BindReference:
-      // Reference binding does not have any corresponding ASTs.
-
-      // Check exception specifications
-      if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
-        return ExprError();
-
-      // We don't check for e.g. function pointers here, since address
-      // availability checks should only occur when the function first decays
-      // into a pointer or reference.
-      if (CurInit.get()->getType()->isFunctionProtoType()) {
-        if (auto *DRE = dyn_cast<DeclRefExpr>(CurInit.get()->IgnoreParens())) {
-          if (auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
-            if (!S.checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
-                                                     DRE->getBeginLoc()))
-              return ExprError();
-          }
-        }
-      }
-
-      CheckForNullPointerDereference(S, CurInit.get());
-      break;
-
-    case SK_BindReferenceToTemporary: {
-      // Make sure the "temporary" is actually an rvalue.
-      assert(CurInit.get()->isRValue() && "not a temporary");
-
-      // Check exception specifications
-      if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
-        return ExprError();
-
-      // Materialize the temporary into memory.
-      MaterializeTemporaryExpr *MTE = S.CreateMaterializeTemporaryExpr(
-          Step->Type, CurInit.get(), Entity.getType()->isLValueReferenceType());
-      CurInit = MTE;
-
-      // If we're extending this temporary to automatic storage duration -- we
-      // need to register its cleanup during the full-expression's cleanups.
-      if (MTE->getStorageDuration() == SD_Automatic &&
-          MTE->getType().isDestructedType())
-        S.Cleanup.setExprNeedsCleanups(true);
-      break;
-    }
-
-    case SK_FinalCopy:
-      if (checkAbstractType(Step->Type))
-        return ExprError();
-
-      // If the overall initialization is initializing a temporary, we already
-      // bound our argument if it was necessary to do so. If not (if we're
-      // ultimately initializing a non-temporary), our argument needs to be
-      // bound since it's initializing a function parameter.
-      // FIXME: This is a mess. Rationalize temporary destruction.
-      if (!shouldBindAsTemporary(Entity))
-        CurInit = S.MaybeBindToTemporary(CurInit.get());
-      CurInit = CopyObject(S, Step->Type, Entity, CurInit,
-                           /*IsExtraneousCopy=*/false);
-      break;
-
-    case SK_ExtraneousCopyToTemporary:
-      CurInit = CopyObject(S, Step->Type, Entity, CurInit,
-                           /*IsExtraneousCopy=*/true);
-      break;
-
-    case SK_UserConversion: {
-      // We have a user-defined conversion that invokes either a constructor
-      // or a conversion function.
-      CastKind CastKind;
-      FunctionDecl *Fn = Step->Function.Function;
-      DeclAccessPair FoundFn = Step->Function.FoundDecl;
-      bool HadMultipleCandidates = Step->Function.HadMultipleCandidates;
-      bool CreatedObject = false;
-      if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Fn)) {
-        // Build a call to the selected constructor.
-        SmallVector<Expr*, 8> ConstructorArgs;
-        SourceLocation Loc = CurInit.get()->getBeginLoc();
-
-        // Determine the arguments required to actually perform the constructor
-        // call.
-        Expr *Arg = CurInit.get();
-        if (S.CompleteConstructorCall(Constructor,
-                                      MultiExprArg(&Arg, 1),
-                                      Loc, ConstructorArgs))
-          return ExprError();
-
-        // Build an expression that constructs a temporary.
-        CurInit = S.BuildCXXConstructExpr(Loc, Step->Type,
-                                          FoundFn, Constructor,
-                                          ConstructorArgs,
-                                          HadMultipleCandidates,
-                                          /*ListInit*/ false,
-                                          /*StdInitListInit*/ false,
-                                          /*ZeroInit*/ false,
-                                          CXXConstructExpr::CK_Complete,
-                                          SourceRange());
-        if (CurInit.isInvalid())
-          return ExprError();
-
-        S.CheckConstructorAccess(Kind.getLocation(), Constructor, FoundFn,
-                                 Entity);
-        if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
-          return ExprError();
-
-        CastKind = CK_ConstructorConversion;
-        CreatedObject = true;
-      } else {
-        // Build a call to the conversion function.
-        CXXConversionDecl *Conversion = cast<CXXConversionDecl>(Fn);
-        S.CheckMemberOperatorAccess(Kind.getLocation(), CurInit.get(), nullptr,
-                                    FoundFn);
-        if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
-          return ExprError();
-
-        CurInit = S.BuildCXXMemberCallExpr(CurInit.get(), FoundFn, Conversion,
-                                           HadMultipleCandidates);
-        if (CurInit.isInvalid())
-          return ExprError();
-
-        CastKind = CK_UserDefinedConversion;
-        CreatedObject = Conversion->getReturnType()->isRecordType();
-      }
-
-      if (CreatedObject && checkAbstractType(CurInit.get()->getType()))
-        return ExprError();
-
-      CurInit = ImplicitCastExpr::Create(S.Context, CurInit.get()->getType(),
-                                         CastKind, CurInit.get(), nullptr,
-                                         CurInit.get()->getValueKind());
-
-      if (shouldBindAsTemporary(Entity))
-        // The overall entity is temporary, so this expression should be
-        // destroyed at the end of its full-expression.
-        CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
-      else if (CreatedObject && shouldDestroyEntity(Entity)) {
-        // The object outlasts the full-expression, but we need to prepare for
-        // a destructor being run on it.
-        // FIXME: It makes no sense to do this here. This should happen
-        // regardless of how we initialized the entity.
-        QualType T = CurInit.get()->getType();
-        if (const RecordType *Record = T->getAs<RecordType>()) {
-          CXXDestructorDecl *Destructor
-            = S.LookupDestructor(cast<CXXRecordDecl>(Record->getDecl()));
-          S.CheckDestructorAccess(CurInit.get()->getBeginLoc(), Destructor,
-                                  S.PDiag(diag::err_access_dtor_temp) << T);
-          S.MarkFunctionReferenced(CurInit.get()->getBeginLoc(), Destructor);
-          if (S.DiagnoseUseOfDecl(Destructor, CurInit.get()->getBeginLoc()))
-            return ExprError();
-        }
-      }
-      break;
-    }
-
-    case SK_QualificationConversionLValue:
-    case SK_QualificationConversionXValue:
-    case SK_QualificationConversionRValue: {
-      // Perform a qualification conversion; these can never go wrong.
-      ExprValueKind VK =
-          Step->Kind == SK_QualificationConversionLValue
-              ? VK_LValue
-              : (Step->Kind == SK_QualificationConversionXValue ? VK_XValue
-                                                                : VK_RValue);
-      CurInit = S.PerformQualificationConversion(CurInit.get(), Step->Type, VK);
-      break;
-    }
-
-    case SK_AtomicConversion: {
-      assert(CurInit.get()->isRValue() && "cannot convert glvalue to atomic");
-      CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
-                                    CK_NonAtomicToAtomic, VK_RValue);
-      break;
-    }
-
-    case SK_LValueToRValue: {
-      assert(CurInit.get()->isGLValue() && "cannot load from a prvalue");
-      CurInit = ImplicitCastExpr::Create(S.Context, Step->Type,
-                                         CK_LValueToRValue, CurInit.get(),
-                                         /*BasePath=*/nullptr, VK_RValue);
-      break;
-    }
-
-    case SK_ConversionSequence:
-    case SK_ConversionSequenceNoNarrowing: {
-      if (const auto *FromPtrType =
-              CurInit.get()->getType()->getAs<PointerType>()) {
-        if (const auto *ToPtrType = Step->Type->getAs<PointerType>()) {
-          if (FromPtrType->getPointeeType()->hasAttr(attr::NoDeref) &&
-              !ToPtrType->getPointeeType()->hasAttr(attr::NoDeref)) {
-            S.Diag(CurInit.get()->getExprLoc(),
-                   diag::warn_noderef_to_dereferenceable_pointer)
-                << CurInit.get()->getSourceRange();
-          }
-        }
-      }
-
-      Sema::CheckedConversionKind CCK
-        = Kind.isCStyleCast()? Sema::CCK_CStyleCast
-        : Kind.isFunctionalCast()? Sema::CCK_FunctionalCast
-        : Kind.isExplicitCast()? Sema::CCK_OtherCast
-        : Sema::CCK_ImplicitConversion;
-      ExprResult CurInitExprRes =
-        S.PerformImplicitConversion(CurInit.get(), Step->Type, *Step->ICS,
-                                    getAssignmentAction(Entity), CCK);
-      if (CurInitExprRes.isInvalid())
-        return ExprError();
-
-      S.DiscardMisalignedMemberAddress(Step->Type.getTypePtr(), CurInit.get());
-
-      CurInit = CurInitExprRes;
-
-      if (Step->Kind == SK_ConversionSequenceNoNarrowing &&
-          S.getLangOpts().CPlusPlus)
-        DiagnoseNarrowingInInitList(S, *Step->ICS, SourceType, Entity.getType(),
-                                    CurInit.get());
-
-      break;
-    }
-
-    case SK_ListInitialization: {
-      if (checkAbstractType(Step->Type))
-        return ExprError();
-
-      InitListExpr *InitList = cast<InitListExpr>(CurInit.get());
-      // If we're not initializing the top-level entity, we need to create an
-      // InitializeTemporary entity for our target type.
-      QualType Ty = Step->Type;
-      bool IsTemporary = !S.Context.hasSameType(Entity.getType(), Ty);
-      InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(Ty);
-      InitializedEntity InitEntity = IsTemporary ? TempEntity : Entity;
-      InitListChecker PerformInitList(S, InitEntity,
-          InitList, Ty, /*VerifyOnly=*/false,
-          /*TreatUnavailableAsInvalid=*/false);
-      if (PerformInitList.HadError())
-        return ExprError();
-
-      // Hack: We must update *ResultType if available in order to set the
-      // bounds of arrays, e.g. in 'int ar[] = {1, 2, 3};'.
-      // Worst case: 'const int (&arref)[] = {1, 2, 3};'.
-      if (ResultType &&
-          ResultType->getNonReferenceType()->isIncompleteArrayType()) {
-        if ((*ResultType)->isRValueReferenceType())
-          Ty = S.Context.getRValueReferenceType(Ty);
-        else if ((*ResultType)->isLValueReferenceType())
-          Ty = S.Context.getLValueReferenceType(Ty,
-            (*ResultType)->getAs<LValueReferenceType>()->isSpelledAsLValue());
-        *ResultType = Ty;
-      }
-
-      InitListExpr *StructuredInitList =
-          PerformInitList.getFullyStructuredList();
-      CurInit.get();
-      CurInit = shouldBindAsTemporary(InitEntity)
-          ? S.MaybeBindToTemporary(StructuredInitList)
-          : StructuredInitList;
-      break;
-    }
-
-    case SK_ConstructorInitializationFromList: {
-      if (checkAbstractType(Step->Type))
-        return ExprError();
-
-      // When an initializer list is passed for a parameter of type "reference
-      // to object", we don't get an EK_Temporary entity, but instead an
-      // EK_Parameter entity with reference type.
-      // FIXME: This is a hack. What we really should do is create a user
-      // conversion step for this case, but this makes it considerably more
-      // complicated. For now, this will do.
-      InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
-                                        Entity.getType().getNonReferenceType());
-      bool UseTemporary = Entity.getType()->isReferenceType();
-      assert(Args.size() == 1 && "expected a single argument for list init");
-      InitListExpr *InitList = cast<InitListExpr>(Args[0]);
-      S.Diag(InitList->getExprLoc(), diag::warn_cxx98_compat_ctor_list_init)
-        << InitList->getSourceRange();
-      MultiExprArg Arg(InitList->getInits(), InitList->getNumInits());
-      CurInit = PerformConstructorInitialization(S, UseTemporary ? TempEntity :
-                                                                   Entity,
-                                                 Kind, Arg, *Step,
-                                               ConstructorInitRequiresZeroInit,
-                                               /*IsListInitialization*/true,
-                                               /*IsStdInitListInit*/false,
-                                               InitList->getLBraceLoc(),
-                                               InitList->getRBraceLoc());
-      break;
-    }
-
-    case SK_UnwrapInitList:
-      CurInit = cast<InitListExpr>(CurInit.get())->getInit(0);
-      break;
-
-    case SK_RewrapInitList: {
-      Expr *E = CurInit.get();
-      InitListExpr *Syntactic = Step->WrappingSyntacticList;
-      InitListExpr *ILE = new (S.Context) InitListExpr(S.Context,
-          Syntactic->getLBraceLoc(), E, Syntactic->getRBraceLoc());
-      ILE->setSyntacticForm(Syntactic);
-      ILE->setType(E->getType());
-      ILE->setValueKind(E->getValueKind());
-      CurInit = ILE;
-      break;
-    }
-
-    case SK_ConstructorInitialization:
-    case SK_StdInitializerListConstructorCall: {
-      if (checkAbstractType(Step->Type))
-        return ExprError();
-
-      // When an initializer list is passed for a parameter of type "reference
-      // to object", we don't get an EK_Temporary entity, but instead an
-      // EK_Parameter entity with reference type.
-      // FIXME: This is a hack. What we really should do is create a user
-      // conversion step for this case, but this makes it considerably more
-      // complicated. For now, this will do.
-      InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
-                                        Entity.getType().getNonReferenceType());
-      bool UseTemporary = Entity.getType()->isReferenceType();
-      bool IsStdInitListInit =
-          Step->Kind == SK_StdInitializerListConstructorCall;
-      Expr *Source = CurInit.get();
-      SourceRange Range = Kind.hasParenOrBraceRange()
-                              ? Kind.getParenOrBraceRange()
-                              : SourceRange();
-      CurInit = PerformConstructorInitialization(
-          S, UseTemporary ? TempEntity : Entity, Kind,
-          Source ? MultiExprArg(Source) : Args, *Step,
-          ConstructorInitRequiresZeroInit,
-          /*IsListInitialization*/ IsStdInitListInit,
-          /*IsStdInitListInitialization*/ IsStdInitListInit,
-          /*LBraceLoc*/ Range.getBegin(),
-          /*RBraceLoc*/ Range.getEnd());
-      break;
-    }
-
-    case SK_ZeroInitialization: {
-      step_iterator NextStep = Step;
-      ++NextStep;
-      if (NextStep != StepEnd &&
-          (NextStep->Kind == SK_ConstructorInitialization ||
-           NextStep->Kind == SK_ConstructorInitializationFromList)) {
-        // The need for zero-initialization is recorded directly into
-        // the call to the object's constructor within the next step.
-        ConstructorInitRequiresZeroInit = true;
-      } else if (Kind.getKind() == InitializationKind::IK_Value &&
-                 S.getLangOpts().CPlusPlus &&
-                 !Kind.isImplicitValueInit()) {
-        TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
-        if (!TSInfo)
-          TSInfo = S.Context.getTrivialTypeSourceInfo(Step->Type,
-                                                    Kind.getRange().getBegin());
-
-        CurInit = new (S.Context) CXXScalarValueInitExpr(
-            Entity.getType().getNonLValueExprType(S.Context), TSInfo,
-            Kind.getRange().getEnd());
-      } else {
-        CurInit = new (S.Context) ImplicitValueInitExpr(Step->Type);
-      }
-      break;
-    }
-
-    case SK_CAssignment: {
-      QualType SourceType = CurInit.get()->getType();
-
-      // Save off the initial CurInit in case we need to emit a diagnostic
-      ExprResult InitialCurInit = CurInit;
-      ExprResult Result = CurInit;
-      Sema::AssignConvertType ConvTy =
-        S.CheckSingleAssignmentConstraints(Step->Type, Result, true,
-            Entity.getKind() == InitializedEntity::EK_Parameter_CF_Audited);
-      if (Result.isInvalid())
-        return ExprError();
-      CurInit = Result;
-
-      // If this is a call, allow conversion to a transparent union.
-      ExprResult CurInitExprRes = CurInit;
-      if (ConvTy != Sema::Compatible &&
-          Entity.isParameterKind() &&
-          S.CheckTransparentUnionArgumentConstraints(Step->Type, CurInitExprRes)
-            == Sema::Compatible)
-        ConvTy = Sema::Compatible;
-      if (CurInitExprRes.isInvalid())
-        return ExprError();
-      CurInit = CurInitExprRes;
-
-      bool Complained;
-      if (S.DiagnoseAssignmentResult(ConvTy, Kind.getLocation(),
-                                     Step->Type, SourceType,
-                                     InitialCurInit.get(),
-                                     getAssignmentAction(Entity, true),
-                                     &Complained)) {
-        PrintInitLocationNote(S, Entity);
-        return ExprError();
-      } else if (Complained)
-        PrintInitLocationNote(S, Entity);
-      break;
-    }
-
-    case SK_StringInit: {
-      QualType Ty = Step->Type;
-      CheckStringInit(CurInit.get(), ResultType ? *ResultType : Ty,
-                      S.Context.getAsArrayType(Ty), S);
-      break;
-    }
-
-    case SK_ObjCObjectConversion:
-      CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
-                          CK_ObjCObjectLValueCast,
-                          CurInit.get()->getValueKind());
-      break;
-
-    case SK_ArrayLoopIndex: {
-      Expr *Cur = CurInit.get();
-      Expr *BaseExpr = new (S.Context)
-          OpaqueValueExpr(Cur->getExprLoc(), Cur->getType(),
-                          Cur->getValueKind(), Cur->getObjectKind(), Cur);
-      Expr *IndexExpr =
-          new (S.Context) ArrayInitIndexExpr(S.Context.getSizeType());
-      CurInit = S.CreateBuiltinArraySubscriptExpr(
-          BaseExpr, Kind.getLocation(), IndexExpr, Kind.getLocation());
-      ArrayLoopCommonExprs.push_back(BaseExpr);
-      break;
-    }
-
-    case SK_ArrayLoopInit: {
-      assert(!ArrayLoopCommonExprs.empty() &&
-             "mismatched SK_ArrayLoopIndex and SK_ArrayLoopInit");
-      Expr *Common = ArrayLoopCommonExprs.pop_back_val();
-      CurInit = new (S.Context) ArrayInitLoopExpr(Step->Type, Common,
-                                                  CurInit.get());
-      break;
-    }
-
-    case SK_GNUArrayInit:
-      // Okay: we checked everything before creating this step. Note that
-      // this is a GNU extension.
-      S.Diag(Kind.getLocation(), diag::ext_array_init_copy)
-        << Step->Type << CurInit.get()->getType()
-        << CurInit.get()->getSourceRange();
-      LLVM_FALLTHROUGH;
-    case SK_ArrayInit:
-      // If the destination type is an incomplete array type, update the
-      // type accordingly.
-      if (ResultType) {
-        if (const IncompleteArrayType *IncompleteDest
-                           = S.Context.getAsIncompleteArrayType(Step->Type)) {
-          if (const ConstantArrayType *ConstantSource
-                 = S.Context.getAsConstantArrayType(CurInit.get()->getType())) {
-            *ResultType = S.Context.getConstantArrayType(
-                                             IncompleteDest->getElementType(),
-                                             ConstantSource->getSize(),
-                                             ArrayType::Normal, 0);
-          }
-        }
-      }
-      break;
-
-    case SK_ParenthesizedArrayInit:
-      // Okay: we checked everything before creating this step. Note that
-      // this is a GNU extension.
-      S.Diag(Kind.getLocation(), diag::ext_array_init_parens)
-        << CurInit.get()->getSourceRange();
-      break;
-
-    case SK_PassByIndirectCopyRestore:
-    case SK_PassByIndirectRestore:
-      checkIndirectCopyRestoreSource(S, CurInit.get());
-      CurInit = new (S.Context) ObjCIndirectCopyRestoreExpr(
-          CurInit.get(), Step->Type,
-          Step->Kind == SK_PassByIndirectCopyRestore);
-      break;
-
-    case SK_ProduceObjCObject:
-      CurInit =
-          ImplicitCastExpr::Create(S.Context, Step->Type, CK_ARCProduceObject,
-                                   CurInit.get(), nullptr, VK_RValue);
-      break;
-
-    case SK_StdInitializerList: {
-      S.Diag(CurInit.get()->getExprLoc(),
-             diag::warn_cxx98_compat_initializer_list_init)
-        << CurInit.get()->getSourceRange();
-
-      // Materialize the temporary into memory.
-      MaterializeTemporaryExpr *MTE = S.CreateMaterializeTemporaryExpr(
-          CurInit.get()->getType(), CurInit.get(),
-          /*BoundToLvalueReference=*/false);
-
-      // Wrap it in a construction of a std::initializer_list<T>.
-      CurInit = new (S.Context) CXXStdInitializerListExpr(Step->Type, MTE);
-
-      // Bind the result, in case the library has given initializer_list a
-      // non-trivial destructor.
-      if (shouldBindAsTemporary(Entity))
-        CurInit = S.MaybeBindToTemporary(CurInit.get());
-      break;
-    }
-
-    case SK_OCLSamplerInit: {
-      // Sampler initialization have 5 cases:
-      //   1. function argument passing
-      //      1a. argument is a file-scope variable
-      //      1b. argument is a function-scope variable
-      //      1c. argument is one of caller function's parameters
-      //   2. variable initialization
-      //      2a. initializing a file-scope variable
-      //      2b. initializing a function-scope variable
-      //
-      // For file-scope variables, since they cannot be initialized by function
-      // call of __translate_sampler_initializer in LLVM IR, their references
-      // need to be replaced by a cast from their literal initializers to
-      // sampler type. Since sampler variables can only be used in function
-      // calls as arguments, we only need to replace them when handling the
-      // argument passing.
-      assert(Step->Type->isSamplerT() &&
-             "Sampler initialization on non-sampler type.");
-      Expr *Init = CurInit.get();
-      QualType SourceType = Init->getType();
-      // Case 1
-      if (Entity.isParameterKind()) {
-        if (!SourceType->isSamplerT() && !SourceType->isIntegerType()) {
-          S.Diag(Kind.getLocation(), diag::err_sampler_argument_required)
-            << SourceType;
-          break;
-        } else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init)) {
-          auto Var = cast<VarDecl>(DRE->getDecl());
-          // Case 1b and 1c
-          // No cast from integer to sampler is needed.
-          if (!Var->hasGlobalStorage()) {
-            CurInit = ImplicitCastExpr::Create(S.Context, Step->Type,
-                                               CK_LValueToRValue, Init,
-                                               /*BasePath=*/nullptr, VK_RValue);
-            break;
-          }
-          // Case 1a
-          // For function call with a file-scope sampler variable as argument,
-          // get the integer literal.
-          // Do not diagnose if the file-scope variable does not have initializer
-          // since this has already been diagnosed when parsing the variable
-          // declaration.
-          if (!Var->getInit() || !isa<ImplicitCastExpr>(Var->getInit()))
-            break;
-          Init = cast<ImplicitCastExpr>(const_cast<Expr*>(
-            Var->getInit()))->getSubExpr();
-          SourceType = Init->getType();
-        }
-      } else {
-        // Case 2
-        // Check initializer is 32 bit integer constant.
-        // If the initializer is taken from global variable, do not diagnose since
-        // this has already been done when parsing the variable declaration.
-        if (!Init->isConstantInitializer(S.Context, false))
-          break;
-
-        if (!SourceType->isIntegerType() ||
-            32 != S.Context.getIntWidth(SourceType)) {
-          S.Diag(Kind.getLocation(), diag::err_sampler_initializer_not_integer)
-            << SourceType;
-          break;
-        }
-
-        Expr::EvalResult EVResult;
-        Init->EvaluateAsInt(EVResult, S.Context);
-        llvm::APSInt Result = EVResult.Val.getInt();
-        const uint64_t SamplerValue = Result.getLimitedValue();
-        // 32-bit value of sampler's initializer is interpreted as
-        // bit-field with the following structure:
-        // |unspecified|Filter|Addressing Mode| Normalized Coords|
-        // |31        6|5    4|3             1|                 0|
-        // This structure corresponds to enum values of sampler properties
-        // defined in SPIR spec v1.2 and also opencl-c.h
-        unsigned AddressingMode  = (0x0E & SamplerValue) >> 1;
-        unsigned FilterMode      = (0x30 & SamplerValue) >> 4;
-        if (FilterMode != 1 && FilterMode != 2 &&
-            !S.getOpenCLOptions().isEnabled(
-                "cl_intel_device_side_avc_motion_estimation"))
-          S.Diag(Kind.getLocation(),
-                 diag::warn_sampler_initializer_invalid_bits)
-                 << "Filter Mode";
-        if (AddressingMode > 4)
-          S.Diag(Kind.getLocation(),
-                 diag::warn_sampler_initializer_invalid_bits)
-                 << "Addressing Mode";
-      }
-
-      // Cases 1a, 2a and 2b
-      // Insert cast from integer to sampler.
-      CurInit = S.ImpCastExprToType(Init, S.Context.OCLSamplerTy,
-                                      CK_IntToOCLSampler);
-      break;
-    }
-    case SK_OCLZeroOpaqueType: {
-      assert((Step->Type->isEventT() || Step->Type->isQueueT() ||
-              Step->Type->isOCLIntelSubgroupAVCType()) &&
-             "Wrong type for initialization of OpenCL opaque type.");
-
-      CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
-                                    CK_ZeroToOCLOpaqueType,
-                                    CurInit.get()->getValueKind());
-      break;
-    }
-    }
-  }
-
-  // Check whether the initializer has a shorter lifetime than the initialized
-  // entity, and if not, either lifetime-extend or warn as appropriate.
-  if (auto *Init = CurInit.get())
-    S.checkInitializerLifetime(Entity, Init);
-
-  // Diagnose non-fatal problems with the completed initialization.
-  if (Entity.getKind() == InitializedEntity::EK_Member &&
-      cast<FieldDecl>(Entity.getDecl())->isBitField())
-    S.CheckBitFieldInitialization(Kind.getLocation(),
-                                  cast<FieldDecl>(Entity.getDecl()),
-                                  CurInit.get());
-
-  // Check for std::move on construction.
-  if (const Expr *E = CurInit.get()) {
-    CheckMoveOnConstruction(S, E,
-                            Entity.getKind() == InitializedEntity::EK_Result);
-  }
-
-  return CurInit;
-}
-
-/// Somewhere within T there is an uninitialized reference subobject.
-/// Dig it out and diagnose it.
-static bool DiagnoseUninitializedReference(Sema &S, SourceLocation Loc,
-                                           QualType T) {
-  if (T->isReferenceType()) {
-    S.Diag(Loc, diag::err_reference_without_init)
-      << T.getNonReferenceType();
-    return true;
-  }
-
-  CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
-  if (!RD || !RD->hasUninitializedReferenceMember())
-    return false;
-
-  for (const auto *FI : RD->fields()) {
-    if (FI->isUnnamedBitfield())
-      continue;
-
-    if (DiagnoseUninitializedReference(S, FI->getLocation(), FI->getType())) {
-      S.Diag(Loc, diag::note_value_initialization_here) << RD;
-      return true;
-    }
-  }
-
-  for (const auto &BI : RD->bases()) {
-    if (DiagnoseUninitializedReference(S, BI.getBeginLoc(), BI.getType())) {
-      S.Diag(Loc, diag::note_value_initialization_here) << RD;
-      return true;
-    }
-  }
-
-  return false;
-}
-
-
-//===----------------------------------------------------------------------===//
-// Diagnose initialization failures
-//===----------------------------------------------------------------------===//
-
-/// Emit notes associated with an initialization that failed due to a
-/// "simple" conversion failure.
-static void emitBadConversionNotes(Sema &S, const InitializedEntity &entity,
-                                   Expr *op) {
-  QualType destType = entity.getType();
-  if (destType.getNonReferenceType()->isObjCObjectPointerType() &&
-      op->getType()->isObjCObjectPointerType()) {
-
-    // Emit a possible note about the conversion failing because the
-    // operand is a message send with a related result type.
-    S.EmitRelatedResultTypeNote(op);
-
-    // Emit a possible note about a return failing because we're
-    // expecting a related result type.
-    if (entity.getKind() == InitializedEntity::EK_Result)
-      S.EmitRelatedResultTypeNoteForReturn(destType);
-  }
-}
-
-static void diagnoseListInit(Sema &S, const InitializedEntity &Entity,
-                             InitListExpr *InitList) {
-  QualType DestType = Entity.getType();
-
-  QualType E;
-  if (S.getLangOpts().CPlusPlus11 && S.isStdInitializerList(DestType, &E)) {
-    QualType ArrayType = S.Context.getConstantArrayType(
-        E.withConst(),
-        llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
-                    InitList->getNumInits()),
-        clang::ArrayType::Normal, 0);
-    InitializedEntity HiddenArray =
-        InitializedEntity::InitializeTemporary(ArrayType);
-    return diagnoseListInit(S, HiddenArray, InitList);
-  }
-
-  if (DestType->isReferenceType()) {
-    // A list-initialization failure for a reference means that we tried to
-    // create a temporary of the inner type (per [dcl.init.list]p3.6) and the
-    // inner initialization failed.
-    QualType T = DestType->getAs<ReferenceType>()->getPointeeType();
-    diagnoseListInit(S, InitializedEntity::InitializeTemporary(T), InitList);
-    SourceLocation Loc = InitList->getBeginLoc();
-    if (auto *D = Entity.getDecl())
-      Loc = D->getLocation();
-    S.Diag(Loc, diag::note_in_reference_temporary_list_initializer) << T;
-    return;
-  }
-
-  InitListChecker DiagnoseInitList(S, Entity, InitList, DestType,
-                                   /*VerifyOnly=*/false,
-                                   /*TreatUnavailableAsInvalid=*/false);
-  assert(DiagnoseInitList.HadError() &&
-         "Inconsistent init list check result.");
-}
-
-bool InitializationSequence::Diagnose(Sema &S,
-                                      const InitializedEntity &Entity,
-                                      const InitializationKind &Kind,
-                                      ArrayRef<Expr *> Args) {
-  if (!Failed())
-    return false;
-
-  // When we want to diagnose only one element of a braced-init-list,
-  // we need to factor it out.
-  Expr *OnlyArg;
-  if (Args.size() == 1) {
-    auto *List = dyn_cast<InitListExpr>(Args[0]);
-    if (List && List->getNumInits() == 1)
-      OnlyArg = List->getInit(0);
-    else
-      OnlyArg = Args[0];
-  }
-  else
-    OnlyArg = nullptr;
-
-  QualType DestType = Entity.getType();
-  switch (Failure) {
-  case FK_TooManyInitsForReference:
-    // FIXME: Customize for the initialized entity?
-    if (Args.empty()) {
-      // Dig out the reference subobject which is uninitialized and diagnose it.
-      // If this is value-initialization, this could be nested some way within
-      // the target type.
-      assert(Kind.getKind() == InitializationKind::IK_Value ||
-             DestType->isReferenceType());
-      bool Diagnosed =
-        DiagnoseUninitializedReference(S, Kind.getLocation(), DestType);
-      assert(Diagnosed && "couldn't find uninitialized reference to diagnose");
-      (void)Diagnosed;
-    } else  // FIXME: diagnostic below could be better!
-      S.Diag(Kind.getLocation(), diag::err_reference_has_multiple_inits)
-          << SourceRange(Args.front()->getBeginLoc(), Args.back()->getEndLoc());
-    break;
-  case FK_ParenthesizedListInitForReference:
-    S.Diag(Kind.getLocation(), diag::err_list_init_in_parens)
-      << 1 << Entity.getType() << Args[0]->getSourceRange();
-    break;
-
-  case FK_ArrayNeedsInitList:
-    S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 0;
-    break;
-  case FK_ArrayNeedsInitListOrStringLiteral:
-    S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 1;
-    break;
-  case FK_ArrayNeedsInitListOrWideStringLiteral:
-    S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 2;
-    break;
-  case FK_NarrowStringIntoWideCharArray:
-    S.Diag(Kind.getLocation(), diag::err_array_init_narrow_string_into_wchar);
-    break;
-  case FK_WideStringIntoCharArray:
-    S.Diag(Kind.getLocation(), diag::err_array_init_wide_string_into_char);
-    break;
-  case FK_IncompatWideStringIntoWideChar:
-    S.Diag(Kind.getLocation(),
-           diag::err_array_init_incompat_wide_string_into_wchar);
-    break;
-  case FK_PlainStringIntoUTF8Char:
-    S.Diag(Kind.getLocation(),
-           diag::err_array_init_plain_string_into_char8_t);
-    S.Diag(Args.front()->getBeginLoc(),
-           diag::note_array_init_plain_string_into_char8_t)
-        << FixItHint::CreateInsertion(Args.front()->getBeginLoc(), "u8");
-    break;
-  case FK_UTF8StringIntoPlainChar:
-    S.Diag(Kind.getLocation(),
-           diag::err_array_init_utf8_string_into_char)
-      << S.getLangOpts().CPlusPlus2a;
-    break;
-  case FK_ArrayTypeMismatch:
-  case FK_NonConstantArrayInit:
-    S.Diag(Kind.getLocation(),
-           (Failure == FK_ArrayTypeMismatch
-              ? diag::err_array_init_different_type
-              : diag::err_array_init_non_constant_array))
-      << DestType.getNonReferenceType()
-      << OnlyArg->getType()
-      << Args[0]->getSourceRange();
-    break;
-
-  case FK_VariableLengthArrayHasInitializer:
-    S.Diag(Kind.getLocation(), diag::err_variable_object_no_init)
-      << Args[0]->getSourceRange();
-    break;
-
-  case FK_AddressOfOverloadFailed: {
-    DeclAccessPair Found;
-    S.ResolveAddressOfOverloadedFunction(OnlyArg,
-                                         DestType.getNonReferenceType(),
-                                         true,
-                                         Found);
-    break;
-  }
-
-  case FK_AddressOfUnaddressableFunction: {
-    auto *FD = cast<FunctionDecl>(cast<DeclRefExpr>(OnlyArg)->getDecl());
-    S.checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
-                                        OnlyArg->getBeginLoc());
-    break;
-  }
-
-  case FK_ReferenceInitOverloadFailed:
-  case FK_UserConversionOverloadFailed:
-    switch (FailedOverloadResult) {
-    case OR_Ambiguous:
-      if (Failure == FK_UserConversionOverloadFailed)
-        S.Diag(Kind.getLocation(), diag::err_typecheck_ambiguous_condition)
-          << OnlyArg->getType() << DestType
-          << Args[0]->getSourceRange();
-      else
-        S.Diag(Kind.getLocation(), diag::err_ref_init_ambiguous)
-          << DestType << OnlyArg->getType()
-          << Args[0]->getSourceRange();
-
-      FailedCandidateSet.NoteCandidates(S, OCD_ViableCandidates, Args);
-      break;
-
-    case OR_No_Viable_Function:
-      if (!S.RequireCompleteType(Kind.getLocation(),
-                                 DestType.getNonReferenceType(),
-                          diag::err_typecheck_nonviable_condition_incomplete,
-                               OnlyArg->getType(), Args[0]->getSourceRange()))
-        S.Diag(Kind.getLocation(), diag::err_typecheck_nonviable_condition)
-          << (Entity.getKind() == InitializedEntity::EK_Result)
-          << OnlyArg->getType() << Args[0]->getSourceRange()
-          << DestType.getNonReferenceType();
-
-      FailedCandidateSet.NoteCandidates(S, OCD_AllCandidates, Args);
-      break;
-
-    case OR_Deleted: {
-      S.Diag(Kind.getLocation(), diag::err_typecheck_deleted_function)
-        << OnlyArg->getType() << DestType.getNonReferenceType()
-        << Args[0]->getSourceRange();
-      OverloadCandidateSet::iterator Best;
-      OverloadingResult Ovl
-        = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
-      if (Ovl == OR_Deleted) {
-        S.NoteDeletedFunction(Best->Function);
-      } else {
-        llvm_unreachable("Inconsistent overload resolution?");
-      }
-      break;
-    }
-
-    case OR_Success:
-      llvm_unreachable("Conversion did not fail!");
-    }
-    break;
-
-  case FK_NonConstLValueReferenceBindingToTemporary:
-    if (isa<InitListExpr>(Args[0])) {
-      S.Diag(Kind.getLocation(),
-             diag::err_lvalue_reference_bind_to_initlist)
-      << DestType.getNonReferenceType().isVolatileQualified()
-      << DestType.getNonReferenceType()
-      << Args[0]->getSourceRange();
-      break;
-    }
-    LLVM_FALLTHROUGH;
-
-  case FK_NonConstLValueReferenceBindingToUnrelated:
-    S.Diag(Kind.getLocation(),
-           Failure == FK_NonConstLValueReferenceBindingToTemporary
-             ? diag::err_lvalue_reference_bind_to_temporary
-             : diag::err_lvalue_reference_bind_to_unrelated)
-      << DestType.getNonReferenceType().isVolatileQualified()
-      << DestType.getNonReferenceType()
-      << OnlyArg->getType()
-      << Args[0]->getSourceRange();
-    break;
-
-  case FK_NonConstLValueReferenceBindingToBitfield: {
-    // We don't necessarily have an unambiguous source bit-field.
-    FieldDecl *BitField = Args[0]->getSourceBitField();
-    S.Diag(Kind.getLocation(), diag::err_reference_bind_to_bitfield)
-      << DestType.isVolatileQualified()
-      << (BitField ? BitField->getDeclName() : DeclarationName())
-      << (BitField != nullptr)
-      << Args[0]->getSourceRange();
-    if (BitField)
-      S.Diag(BitField->getLocation(), diag::note_bitfield_decl);
-    break;
-  }
-
-  case FK_NonConstLValueReferenceBindingToVectorElement:
-    S.Diag(Kind.getLocation(), diag::err_reference_bind_to_vector_element)
-      << DestType.isVolatileQualified()
-      << Args[0]->getSourceRange();
-    break;
-
-  case FK_RValueReferenceBindingToLValue:
-    S.Diag(Kind.getLocation(), diag::err_lvalue_to_rvalue_ref)
-      << DestType.getNonReferenceType() << OnlyArg->getType()
-      << Args[0]->getSourceRange();
-    break;
-
-  case FK_ReferenceInitDropsQualifiers: {
-    QualType SourceType = OnlyArg->getType();
-    QualType NonRefType = DestType.getNonReferenceType();
-    Qualifiers DroppedQualifiers =
-        SourceType.getQualifiers() - NonRefType.getQualifiers();
-
-    S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
-      << SourceType
-      << NonRefType
-      << DroppedQualifiers.getCVRQualifiers()
-      << Args[0]->getSourceRange();
-    break;
-  }
-
-  case FK_ReferenceInitFailed:
-    S.Diag(Kind.getLocation(), diag::err_reference_bind_failed)
-      << DestType.getNonReferenceType()
-      << OnlyArg->isLValue()
-      << OnlyArg->getType()
-      << Args[0]->getSourceRange();
-    emitBadConversionNotes(S, Entity, Args[0]);
-    break;
-
-  case FK_ConversionFailed: {
-    QualType FromType = OnlyArg->getType();
-    PartialDiagnostic PDiag = S.PDiag(diag::err_init_conversion_failed)
-      << (int)Entity.getKind()
-      << DestType
-      << OnlyArg->isLValue()
-      << FromType
-      << Args[0]->getSourceRange();
-    S.HandleFunctionTypeMismatch(PDiag, FromType, DestType);
-    S.Diag(Kind.getLocation(), PDiag);
-    emitBadConversionNotes(S, Entity, Args[0]);
-    break;
-  }
-
-  case FK_ConversionFromPropertyFailed:
-    // No-op. This error has already been reported.
-    break;
-
-  case FK_TooManyInitsForScalar: {
-    SourceRange R;
-
-    auto *InitList = dyn_cast<InitListExpr>(Args[0]);
-    if (InitList && InitList->getNumInits() >= 1) {
-      R = SourceRange(InitList->getInit(0)->getEndLoc(), InitList->getEndLoc());
-    } else {
-      assert(Args.size() > 1 && "Expected multiple initializers!");
-      R = SourceRange(Args.front()->getEndLoc(), Args.back()->getEndLoc());
-    }
-
-    R.setBegin(S.getLocForEndOfToken(R.getBegin()));
-    if (Kind.isCStyleOrFunctionalCast())
-      S.Diag(Kind.getLocation(), diag::err_builtin_func_cast_more_than_one_arg)
-        << R;
-    else
-      S.Diag(Kind.getLocation(), diag::err_excess_initializers)
-        << /*scalar=*/2 << R;
-    break;
-  }
-
-  case FK_ParenthesizedListInitForScalar:
-    S.Diag(Kind.getLocation(), diag::err_list_init_in_parens)
-      << 0 << Entity.getType() << Args[0]->getSourceRange();
-    break;
-
-  case FK_ReferenceBindingToInitList:
-    S.Diag(Kind.getLocation(), diag::err_reference_bind_init_list)
-      << DestType.getNonReferenceType() << Args[0]->getSourceRange();
-    break;
-
-  case FK_InitListBadDestinationType:
-    S.Diag(Kind.getLocation(), diag::err_init_list_bad_dest_type)
-      << (DestType->isRecordType()) << DestType << Args[0]->getSourceRange();
-    break;
-
-  case FK_ListConstructorOverloadFailed:
-  case FK_ConstructorOverloadFailed: {
-    SourceRange ArgsRange;
-    if (Args.size())
-      ArgsRange =
-          SourceRange(Args.front()->getBeginLoc(), Args.back()->getEndLoc());
-
-    if (Failure == FK_ListConstructorOverloadFailed) {
-      assert(Args.size() == 1 &&
-             "List construction from other than 1 argument.");
-      InitListExpr *InitList = cast<InitListExpr>(Args[0]);
-      Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
-    }
-
-    // FIXME: Using "DestType" for the entity we're printing is probably
-    // bad.
-    switch (FailedOverloadResult) {
-      case OR_Ambiguous:
-        S.Diag(Kind.getLocation(), diag::err_ovl_ambiguous_init)
-          << DestType << ArgsRange;
-        FailedCandidateSet.NoteCandidates(S, OCD_ViableCandidates, Args);
-        break;
-
-      case OR_No_Viable_Function:
-        if (Kind.getKind() == InitializationKind::IK_Default &&
-            (Entity.getKind() == InitializedEntity::EK_Base ||
-             Entity.getKind() == InitializedEntity::EK_Member) &&
-            isa<CXXConstructorDecl>(S.CurContext)) {
-          // This is implicit default initialization of a member or
-          // base within a constructor. If no viable function was
-          // found, notify the user that they need to explicitly
-          // initialize this base/member.
-          CXXConstructorDecl *Constructor
-            = cast<CXXConstructorDecl>(S.CurContext);
-          const CXXRecordDecl *InheritedFrom = nullptr;
-          if (auto Inherited = Constructor->getInheritedConstructor())
-            InheritedFrom = Inherited.getShadowDecl()->getNominatedBaseClass();
-          if (Entity.getKind() == InitializedEntity::EK_Base) {
-            S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
-              << (InheritedFrom ? 2 : Constructor->isImplicit() ? 1 : 0)
-              << S.Context.getTypeDeclType(Constructor->getParent())
-              << /*base=*/0
-              << Entity.getType()
-              << InheritedFrom;
-
-            RecordDecl *BaseDecl
-              = Entity.getBaseSpecifier()->getType()->getAs<RecordType>()
-                                                                  ->getDecl();
-            S.Diag(BaseDecl->getLocation(), diag::note_previous_decl)
-              << S.Context.getTagDeclType(BaseDecl);
-          } else {
-            S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
-              << (InheritedFrom ? 2 : Constructor->isImplicit() ? 1 : 0)
-              << S.Context.getTypeDeclType(Constructor->getParent())
-              << /*member=*/1
-              << Entity.getName()
-              << InheritedFrom;
-            S.Diag(Entity.getDecl()->getLocation(),
-                   diag::note_member_declared_at);
-
-            if (const RecordType *Record
-                                 = Entity.getType()->getAs<RecordType>())
-              S.Diag(Record->getDecl()->getLocation(),
-                     diag::note_previous_decl)
-                << S.Context.getTagDeclType(Record->getDecl());
-          }
-          break;
-        }
-
-        S.Diag(Kind.getLocation(), diag::err_ovl_no_viable_function_in_init)
-          << DestType << ArgsRange;
-        FailedCandidateSet.NoteCandidates(S, OCD_AllCandidates, Args);
-        break;
-
-      case OR_Deleted: {
-        OverloadCandidateSet::iterator Best;
-        OverloadingResult Ovl
-          = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
-        if (Ovl != OR_Deleted) {
-          S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
-            << true << DestType << ArgsRange;
-          llvm_unreachable("Inconsistent overload resolution?");
-          break;
-        }
-
-        // If this is a defaulted or implicitly-declared function, then
-        // it was implicitly deleted. Make it clear that the deletion was
-        // implicit.
-        if (S.isImplicitlyDeleted(Best->Function))
-          S.Diag(Kind.getLocation(), diag::err_ovl_deleted_special_init)
-            << S.getSpecialMember(cast<CXXMethodDecl>(Best->Function))
-            << DestType << ArgsRange;
-        else
-          S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
-            << true << DestType << ArgsRange;
-
-        S.NoteDeletedFunction(Best->Function);
-        break;
-      }
-
-      case OR_Success:
-        llvm_unreachable("Conversion did not fail!");
-    }
-  }
-  break;
-
-  case FK_DefaultInitOfConst:
-    if (Entity.getKind() == InitializedEntity::EK_Member &&
-        isa<CXXConstructorDecl>(S.CurContext)) {
-      // This is implicit default-initialization of a const member in
-      // a constructor. Complain that it needs to be explicitly
-      // initialized.
-      CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(S.CurContext);
-      S.Diag(Kind.getLocation(), diag::err_uninitialized_member_in_ctor)
-        << (Constructor->getInheritedConstructor() ? 2 :
-            Constructor->isImplicit() ? 1 : 0)
-        << S.Context.getTypeDeclType(Constructor->getParent())
-        << /*const=*/1
-        << Entity.getName();
-      S.Diag(Entity.getDecl()->getLocation(), diag::note_previous_decl)
-        << Entity.getName();
-    } else {
-      S.Diag(Kind.getLocation(), diag::err_default_init_const)
-          << DestType << (bool)DestType->getAs<RecordType>();
-    }
-    break;
-
-  case FK_Incomplete:
-    S.RequireCompleteType(Kind.getLocation(), FailedIncompleteType,
-                          diag::err_init_incomplete_type);
-    break;
-
-  case FK_ListInitializationFailed: {
-    // Run the init list checker again to emit diagnostics.
-    InitListExpr *InitList = cast<InitListExpr>(Args[0]);
-    diagnoseListInit(S, Entity, InitList);
-    break;
-  }
-
-  case FK_PlaceholderType: {
-    // FIXME: Already diagnosed!
-    break;
-  }
-
-  case FK_ExplicitConstructor: {
-    S.Diag(Kind.getLocation(), diag::err_selected_explicit_constructor)
-      << Args[0]->getSourceRange();
-    OverloadCandidateSet::iterator Best;
-    OverloadingResult Ovl
-      = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
-    (void)Ovl;
-    assert(Ovl == OR_Success && "Inconsistent overload resolution");
-    CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
-    S.Diag(CtorDecl->getLocation(),
-           diag::note_explicit_ctor_deduction_guide_here) << false;
-    break;
-  }
-  }
-
-  PrintInitLocationNote(S, Entity);
-  return true;
-}
-
-void InitializationSequence::dump(raw_ostream &OS) const {
-  switch (SequenceKind) {
-  case FailedSequence: {
-    OS << "Failed sequence: ";
-    switch (Failure) {
-    case FK_TooManyInitsForReference:
-      OS << "too many initializers for reference";
-      break;
-
-    case FK_ParenthesizedListInitForReference:
-      OS << "parenthesized list init for reference";
-      break;
-
-    case FK_ArrayNeedsInitList:
-      OS << "array requires initializer list";
-      break;
-
-    case FK_AddressOfUnaddressableFunction:
-      OS << "address of unaddressable function was taken";
-      break;
-
-    case FK_ArrayNeedsInitListOrStringLiteral:
-      OS << "array requires initializer list or string literal";
-      break;
-
-    case FK_ArrayNeedsInitListOrWideStringLiteral:
-      OS << "array requires initializer list or wide string literal";
-      break;
-
-    case FK_NarrowStringIntoWideCharArray:
-      OS << "narrow string into wide char array";
-      break;
-
-    case FK_WideStringIntoCharArray:
-      OS << "wide string into char array";
-      break;
-
-    case FK_IncompatWideStringIntoWideChar:
-      OS << "incompatible wide string into wide char array";
-      break;
-
-    case FK_PlainStringIntoUTF8Char:
-      OS << "plain string literal into char8_t array";
-      break;
-
-    case FK_UTF8StringIntoPlainChar:
-      OS << "u8 string literal into char array";
-      break;
-
-    case FK_ArrayTypeMismatch:
-      OS << "array type mismatch";
-      break;
-
-    case FK_NonConstantArrayInit:
-      OS << "non-constant array initializer";
-      break;
-
-    case FK_AddressOfOverloadFailed:
-      OS << "address of overloaded function failed";
-      break;
-
-    case FK_ReferenceInitOverloadFailed:
-      OS << "overload resolution for reference initialization failed";
-      break;
-
-    case FK_NonConstLValueReferenceBindingToTemporary:
-      OS << "non-const lvalue reference bound to temporary";
-      break;
-
-    case FK_NonConstLValueReferenceBindingToBitfield:
-      OS << "non-const lvalue reference bound to bit-field";
-      break;
-
-    case FK_NonConstLValueReferenceBindingToVectorElement:
-      OS << "non-const lvalue reference bound to vector element";
-      break;
-
-    case FK_NonConstLValueReferenceBindingToUnrelated:
-      OS << "non-const lvalue reference bound to unrelated type";
-      break;
-
-    case FK_RValueReferenceBindingToLValue:
-      OS << "rvalue reference bound to an lvalue";
-      break;
-
-    case FK_ReferenceInitDropsQualifiers:
-      OS << "reference initialization drops qualifiers";
-      break;
-
-    case FK_ReferenceInitFailed:
-      OS << "reference initialization failed";
-      break;
-
-    case FK_ConversionFailed:
-      OS << "conversion failed";
-      break;
-
-    case FK_ConversionFromPropertyFailed:
-      OS << "conversion from property failed";
-      break;
-
-    case FK_TooManyInitsForScalar:
-      OS << "too many initializers for scalar";
-      break;
-
-    case FK_ParenthesizedListInitForScalar:
-      OS << "parenthesized list init for reference";
-      break;
-
-    case FK_ReferenceBindingToInitList:
-      OS << "referencing binding to initializer list";
-      break;
-
-    case FK_InitListBadDestinationType:
-      OS << "initializer list for non-aggregate, non-scalar type";
-      break;
-
-    case FK_UserConversionOverloadFailed:
-      OS << "overloading failed for user-defined conversion";
-      break;
-
-    case FK_ConstructorOverloadFailed:
-      OS << "constructor overloading failed";
-      break;
-
-    case FK_DefaultInitOfConst:
-      OS << "default initialization of a const variable";
-      break;
-
-    case FK_Incomplete:
-      OS << "initialization of incomplete type";
-      break;
-
-    case FK_ListInitializationFailed:
-      OS << "list initialization checker failure";
-      break;
-
-    case FK_VariableLengthArrayHasInitializer:
-      OS << "variable length array has an initializer";
-      break;
-
-    case FK_PlaceholderType:
-      OS << "initializer expression isn't contextually valid";
-      break;
-
-    case FK_ListConstructorOverloadFailed:
-      OS << "list constructor overloading failed";
-      break;
-
-    case FK_ExplicitConstructor:
-      OS << "list copy initialization chose explicit constructor";
-      break;
-    }
-    OS << '\n';
-    return;
-  }
-
-  case DependentSequence:
-    OS << "Dependent sequence\n";
-    return;
-
-  case NormalSequence:
-    OS << "Normal sequence: ";
-    break;
-  }
-
-  for (step_iterator S = step_begin(), SEnd = step_end(); S != SEnd; ++S) {
-    if (S != step_begin()) {
-      OS << " -> ";
-    }
-
-    switch (S->Kind) {
-    case SK_ResolveAddressOfOverloadedFunction:
-      OS << "resolve address of overloaded function";
-      break;
-
-    case SK_CastDerivedToBaseRValue:
-      OS << "derived-to-base (rvalue)";
-      break;
-
-    case SK_CastDerivedToBaseXValue:
-      OS << "derived-to-base (xvalue)";
-      break;
-
-    case SK_CastDerivedToBaseLValue:
-      OS << "derived-to-base (lvalue)";
-      break;
-
-    case SK_BindReference:
-      OS << "bind reference to lvalue";
-      break;
-
-    case SK_BindReferenceToTemporary:
-      OS << "bind reference to a temporary";
-      break;
-
-    case SK_FinalCopy:
-      OS << "final copy in class direct-initialization";
-      break;
-
-    case SK_ExtraneousCopyToTemporary:
-      OS << "extraneous C++03 copy to temporary";
-      break;
-
-    case SK_UserConversion:
-      OS << "user-defined conversion via " << *S->Function.Function;
-      break;
-
-    case SK_QualificationConversionRValue:
-      OS << "qualification conversion (rvalue)";
-      break;
-
-    case SK_QualificationConversionXValue:
-      OS << "qualification conversion (xvalue)";
-      break;
-
-    case SK_QualificationConversionLValue:
-      OS << "qualification conversion (lvalue)";
-      break;
-
-    case SK_AtomicConversion:
-      OS << "non-atomic-to-atomic conversion";
-      break;
-
-    case SK_LValueToRValue:
-      OS << "load (lvalue to rvalue)";
-      break;
-
-    case SK_ConversionSequence:
-      OS << "implicit conversion sequence (";
-      S->ICS->dump(); // FIXME: use OS
-      OS << ")";
-      break;
-
-    case SK_ConversionSequenceNoNarrowing:
-      OS << "implicit conversion sequence with narrowing prohibited (";
-      S->ICS->dump(); // FIXME: use OS
-      OS << ")";
-      break;
-
-    case SK_ListInitialization:
-      OS << "list aggregate initialization";
-      break;
-
-    case SK_UnwrapInitList:
-      OS << "unwrap reference initializer list";
-      break;
-
-    case SK_RewrapInitList:
-      OS << "rewrap reference initializer list";
-      break;
-
-    case SK_ConstructorInitialization:
-      OS << "constructor initialization";
-      break;
-
-    case SK_ConstructorInitializationFromList:
-      OS << "list initialization via constructor";
-      break;
-
-    case SK_ZeroInitialization:
-      OS << "zero initialization";
-      break;
-
-    case SK_CAssignment:
-      OS << "C assignment";
-      break;
-
-    case SK_StringInit:
-      OS << "string initialization";
-      break;
-
-    case SK_ObjCObjectConversion:
-      OS << "Objective-C object conversion";
-      break;
-
-    case SK_ArrayLoopIndex:
-      OS << "indexing for array initialization loop";
-      break;
-
-    case SK_ArrayLoopInit:
-      OS << "array initialization loop";
-      break;
-
-    case SK_ArrayInit:
-      OS << "array initialization";
-      break;
-
-    case SK_GNUArrayInit:
-      OS << "array initialization (GNU extension)";
-      break;
-
-    case SK_ParenthesizedArrayInit:
-      OS << "parenthesized array initialization";
-      break;
-
-    case SK_PassByIndirectCopyRestore:
-      OS << "pass by indirect copy and restore";
-      break;
-
-    case SK_PassByIndirectRestore:
-      OS << "pass by indirect restore";
-      break;
-
-    case SK_ProduceObjCObject:
-      OS << "Objective-C object retension";
-      break;
-
-    case SK_StdInitializerList:
-      OS << "std::initializer_list from initializer list";
-      break;
-
-    case SK_StdInitializerListConstructorCall:
-      OS << "list initialization from std::initializer_list";
-      break;
-
-    case SK_OCLSamplerInit:
-      OS << "OpenCL sampler_t from integer constant";
-      break;
-
-    case SK_OCLZeroOpaqueType:
-      OS << "OpenCL opaque type from zero";
-      break;
-    }
-
-    OS << " [" << S->Type.getAsString() << ']';
-  }
-
-  OS << '\n';
-}
-
-void InitializationSequence::dump() const {
-  dump(llvm::errs());
-}
-
-static bool NarrowingErrs(const LangOptions &L) {
-  return L.CPlusPlus11 &&
-         (!L.MicrosoftExt || L.isCompatibleWithMSVC(LangOptions::MSVC2015));
-}
-
-static void DiagnoseNarrowingInInitList(Sema &S,
-                                        const ImplicitConversionSequence &ICS,
-                                        QualType PreNarrowingType,
-                                        QualType EntityType,
-                                        const Expr *PostInit) {
-  const StandardConversionSequence *SCS = nullptr;
-  switch (ICS.getKind()) {
-  case ImplicitConversionSequence::StandardConversion:
-    SCS = &ICS.Standard;
-    break;
-  case ImplicitConversionSequence::UserDefinedConversion:
-    SCS = &ICS.UserDefined.After;
-    break;
-  case ImplicitConversionSequence::AmbiguousConversion:
-  case ImplicitConversionSequence::EllipsisConversion:
-  case ImplicitConversionSequence::BadConversion:
-    return;
-  }
-
-  // C++11 [dcl.init.list]p7: Check whether this is a narrowing conversion.
-  APValue ConstantValue;
-  QualType ConstantType;
-  switch (SCS->getNarrowingKind(S.Context, PostInit, ConstantValue,
-                                ConstantType)) {
-  case NK_Not_Narrowing:
-  case NK_Dependent_Narrowing:
-    // No narrowing occurred.
-    return;
-
-  case NK_Type_Narrowing:
-    // This was a floating-to-integer conversion, which is always considered a
-    // narrowing conversion even if the value is a constant and can be
-    // represented exactly as an integer.
-    S.Diag(PostInit->getBeginLoc(), NarrowingErrs(S.getLangOpts())
-                                        ? diag::ext_init_list_type_narrowing
-                                        : diag::warn_init_list_type_narrowing)
-        << PostInit->getSourceRange()
-        << PreNarrowingType.getLocalUnqualifiedType()
-        << EntityType.getLocalUnqualifiedType();
-    break;
-
-  case NK_Constant_Narrowing:
-    // A constant value was narrowed.
-    S.Diag(PostInit->getBeginLoc(),
-           NarrowingErrs(S.getLangOpts())
-               ? diag::ext_init_list_constant_narrowing
-               : diag::warn_init_list_constant_narrowing)
-        << PostInit->getSourceRange()
-        << ConstantValue.getAsString(S.getASTContext(), ConstantType)
-        << EntityType.getLocalUnqualifiedType();
-    break;
-
-  case NK_Variable_Narrowing:
-    // A variable's value may have been narrowed.
-    S.Diag(PostInit->getBeginLoc(),
-           NarrowingErrs(S.getLangOpts())
-               ? diag::ext_init_list_variable_narrowing
-               : diag::warn_init_list_variable_narrowing)
-        << PostInit->getSourceRange()
-        << PreNarrowingType.getLocalUnqualifiedType()
-        << EntityType.getLocalUnqualifiedType();
-    break;
-  }
-
-  SmallString<128> StaticCast;
-  llvm::raw_svector_ostream OS(StaticCast);
-  OS << "static_cast<";
-  if (const TypedefType *TT = EntityType->getAs<TypedefType>()) {
-    // It's important to use the typedef's name if there is one so that the
-    // fixit doesn't break code using types like int64_t.
-    //
-    // FIXME: This will break if the typedef requires qualification.  But
-    // getQualifiedNameAsString() includes non-machine-parsable components.
-    OS << *TT->getDecl();
-  } else if (const BuiltinType *BT = EntityType->getAs<BuiltinType>())
-    OS << BT->getName(S.getLangOpts());
-  else {
-    // Oops, we didn't find the actual type of the variable.  Don't emit a fixit
-    // with a broken cast.
-    return;
-  }
-  OS << ">(";
-  S.Diag(PostInit->getBeginLoc(), diag::note_init_list_narrowing_silence)
-      << PostInit->getSourceRange()
-      << FixItHint::CreateInsertion(PostInit->getBeginLoc(), OS.str())
-      << FixItHint::CreateInsertion(
-             S.getLocForEndOfToken(PostInit->getEndLoc()), ")");
-}
-
-//===----------------------------------------------------------------------===//
-// Initialization helper functions
-//===----------------------------------------------------------------------===//
-bool
-Sema::CanPerformCopyInitialization(const InitializedEntity &Entity,
-                                   ExprResult Init) {
-  if (Init.isInvalid())
-    return false;
-
-  Expr *InitE = Init.get();
-  assert(InitE && "No initialization expression");
-
-  InitializationKind Kind =
-      InitializationKind::CreateCopy(InitE->getBeginLoc(), SourceLocation());
-  InitializationSequence Seq(*this, Entity, Kind, InitE);
-  return !Seq.Failed();
-}
-
-ExprResult
-Sema::PerformCopyInitialization(const InitializedEntity &Entity,
-                                SourceLocation EqualLoc,
-                                ExprResult Init,
-                                bool TopLevelOfInitList,
-                                bool AllowExplicit) {
-  if (Init.isInvalid())
-    return ExprError();
-
-  Expr *InitE = Init.get();
-  assert(InitE && "No initialization expression?");
-
-  if (EqualLoc.isInvalid())
-    EqualLoc = InitE->getBeginLoc();
-
-  InitializationKind Kind = InitializationKind::CreateCopy(
-      InitE->getBeginLoc(), EqualLoc, AllowExplicit);
-  InitializationSequence Seq(*this, Entity, Kind, InitE, TopLevelOfInitList);
-
-  // Prevent infinite recursion when performing parameter copy-initialization.
-  const bool ShouldTrackCopy =
-      Entity.isParameterKind() && Seq.isConstructorInitialization();
-  if (ShouldTrackCopy) {
-    if (llvm::find(CurrentParameterCopyTypes, Entity.getType()) !=
-        CurrentParameterCopyTypes.end()) {
-      Seq.SetOverloadFailure(
-          InitializationSequence::FK_ConstructorOverloadFailed,
-          OR_No_Viable_Function);
-
-      // Try to give a meaningful diagnostic note for the problematic
-      // constructor.
-      const auto LastStep = Seq.step_end() - 1;
-      assert(LastStep->Kind ==
-             InitializationSequence::SK_ConstructorInitialization);
-      const FunctionDecl *Function = LastStep->Function.Function;
-      auto Candidate =
-          llvm::find_if(Seq.getFailedCandidateSet(),
-                        [Function](const OverloadCandidate &Candidate) -> bool {
-                          return Candidate.Viable &&
-                                 Candidate.Function == Function &&
-                                 Candidate.Conversions.size() > 0;
-                        });
-      if (Candidate != Seq.getFailedCandidateSet().end() &&
-          Function->getNumParams() > 0) {
-        Candidate->Viable = false;
-        Candidate->FailureKind = ovl_fail_bad_conversion;
-        Candidate->Conversions[0].setBad(BadConversionSequence::no_conversion,
-                                         InitE,
-                                         Function->getParamDecl(0)->getType());
-      }
-    }
-    CurrentParameterCopyTypes.push_back(Entity.getType());
-  }
-
-  ExprResult Result = Seq.Perform(*this, Entity, Kind, InitE);
-
-  if (ShouldTrackCopy)
-    CurrentParameterCopyTypes.pop_back();
-
-  return Result;
-}
-
-/// Determine whether RD is, or is derived from, a specialization of CTD.
-static bool isOrIsDerivedFromSpecializationOf(CXXRecordDecl *RD,
-                                              ClassTemplateDecl *CTD) {
-  auto NotSpecialization = [&] (const CXXRecordDecl *Candidate) {
-    auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(Candidate);
-    return !CTSD || !declaresSameEntity(CTSD->getSpecializedTemplate(), CTD);
-  };
-  return !(NotSpecialization(RD) && RD->forallBases(NotSpecialization));
-}
-
-QualType Sema::DeduceTemplateSpecializationFromInitializer(
-    TypeSourceInfo *TSInfo, const InitializedEntity &Entity,
-    const InitializationKind &Kind, MultiExprArg Inits) {
-  auto *DeducedTST = dyn_cast<DeducedTemplateSpecializationType>(
-      TSInfo->getType()->getContainedDeducedType());
-  assert(DeducedTST && "not a deduced template specialization type");
-
-  auto TemplateName = DeducedTST->getTemplateName();
-  if (TemplateName.isDependent())
-    return Context.DependentTy;
-
-  // We can only perform deduction for class templates.
-  auto *Template =
-      dyn_cast_or_null<ClassTemplateDecl>(TemplateName.getAsTemplateDecl());
-  if (!Template) {
-    Diag(Kind.getLocation(),
-         diag::err_deduced_non_class_template_specialization_type)
-      << (int)getTemplateNameKindForDiagnostics(TemplateName) << TemplateName;
-    if (auto *TD = TemplateName.getAsTemplateDecl())
-      Diag(TD->getLocation(), diag::note_template_decl_here);
-    return QualType();
-  }
-
-  // Can't deduce from dependent arguments.
-  if (Expr::hasAnyTypeDependentArguments(Inits)) {
-    Diag(TSInfo->getTypeLoc().getBeginLoc(),
-         diag::warn_cxx14_compat_class_template_argument_deduction)
-        << TSInfo->getTypeLoc().getSourceRange() << 0;
-    return Context.DependentTy;
-  }
-
-  // FIXME: Perform "exact type" matching first, per CWG discussion?
-  //        Or implement this via an implied 'T(T) -> T' deduction guide?
-
-  // FIXME: Do we need/want a std::initializer_list<T> special case?
-
-  // Look up deduction guides, including those synthesized from constructors.
-  //
-  // C++1z [over.match.class.deduct]p1:
-  //   A set of functions and function templates is formed comprising:
-  //   - For each constructor of the class template designated by the
-  //     template-name, a function template [...]
-  //  - For each deduction-guide, a function or function template [...]
-  DeclarationNameInfo NameInfo(
-      Context.DeclarationNames.getCXXDeductionGuideName(Template),
-      TSInfo->getTypeLoc().getEndLoc());
-  LookupResult Guides(*this, NameInfo, LookupOrdinaryName);
-  LookupQualifiedName(Guides, Template->getDeclContext());
-
-  // FIXME: Do not diagnose inaccessible deduction guides. The standard isn't
-  // clear on this, but they're not found by name so access does not apply.
-  Guides.suppressDiagnostics();
-
-  // Figure out if this is list-initialization.
-  InitListExpr *ListInit =
-      (Inits.size() == 1 && Kind.getKind() != InitializationKind::IK_Direct)
-          ? dyn_cast<InitListExpr>(Inits[0])
-          : nullptr;
-
-  // C++1z [over.match.class.deduct]p1:
-  //   Initialization and overload resolution are performed as described in
-  //   [dcl.init] and [over.match.ctor], [over.match.copy], or [over.match.list]
-  //   (as appropriate for the type of initialization performed) for an object
-  //   of a hypothetical class type, where the selected functions and function
-  //   templates are considered to be the constructors of that class type
-  //
-  // Since we know we're initializing a class type of a type unrelated to that
-  // of the initializer, this reduces to something fairly reasonable.
-  OverloadCandidateSet Candidates(Kind.getLocation(),
-                                  OverloadCandidateSet::CSK_Normal);
-  OverloadCandidateSet::iterator Best;
-  auto tryToResolveOverload =
-      [&](bool OnlyListConstructors) -> OverloadingResult {
-    Candidates.clear(OverloadCandidateSet::CSK_Normal);
-    for (auto I = Guides.begin(), E = Guides.end(); I != E; ++I) {
-      NamedDecl *D = (*I)->getUnderlyingDecl();
-      if (D->isInvalidDecl())
-        continue;
-
-      auto *TD = dyn_cast<FunctionTemplateDecl>(D);
-      auto *GD = dyn_cast_or_null<CXXDeductionGuideDecl>(
-          TD ? TD->getTemplatedDecl() : dyn_cast<FunctionDecl>(D));
-      if (!GD)
-        continue;
-
-      // C++ [over.match.ctor]p1: (non-list copy-initialization from non-class)
-      //   For copy-initialization, the candidate functions are all the
-      //   converting constructors (12.3.1) of that class.
-      // C++ [over.match.copy]p1: (non-list copy-initialization from class)
-      //   The converting constructors of T are candidate functions.
-      if (Kind.isCopyInit() && !ListInit) {
-        // Only consider converting constructors.
-        if (GD->isExplicit())
-          continue;
-
-        // When looking for a converting constructor, deduction guides that
-        // could never be called with one argument are not interesting to
-        // check or note.
-        if (GD->getMinRequiredArguments() > 1 ||
-            (GD->getNumParams() == 0 && !GD->isVariadic()))
-          continue;
-      }
-
-      // C++ [over.match.list]p1.1: (first phase list initialization)
-      //   Initially, the candidate functions are the initializer-list
-      //   constructors of the class T
-      if (OnlyListConstructors && !isInitListConstructor(GD))
-        continue;
-
-      // C++ [over.match.list]p1.2: (second phase list initialization)
-      //   the candidate functions are all the constructors of the class T
-      // C++ [over.match.ctor]p1: (all other cases)
-      //   the candidate functions are all the constructors of the class of
-      //   the object being initialized
-
-      // C++ [over.best.ics]p4:
-      //   When [...] the constructor [...] is a candidate by
-      //    - [over.match.copy] (in all cases)
-      // FIXME: The "second phase of [over.match.list] case can also
-      // theoretically happen here, but it's not clear whether we can
-      // ever have a parameter of the right type.
-      bool SuppressUserConversions = Kind.isCopyInit();
-
-      if (TD)
-        AddTemplateOverloadCandidate(TD, I.getPair(), /*ExplicitArgs*/ nullptr,
-                                     Inits, Candidates,
-                                     SuppressUserConversions);
-      else
-        AddOverloadCandidate(GD, I.getPair(), Inits, Candidates,
-                             SuppressUserConversions);
-    }
-    return Candidates.BestViableFunction(*this, Kind.getLocation(), Best);
-  };
-
-  OverloadingResult Result = OR_No_Viable_Function;
-
-  // C++11 [over.match.list]p1, per DR1467: for list-initialization, first
-  // try initializer-list constructors.
-  if (ListInit) {
-    bool TryListConstructors = true;
-
-    // Try list constructors unless the list is empty and the class has one or
-    // more default constructors, in which case those constructors win.
-    if (!ListInit->getNumInits()) {
-      for (NamedDecl *D : Guides) {
-        auto *FD = dyn_cast<FunctionDecl>(D->getUnderlyingDecl());
-        if (FD && FD->getMinRequiredArguments() == 0) {
-          TryListConstructors = false;
-          break;
-        }
-      }
-    } else if (ListInit->getNumInits() == 1) {
-      // C++ [over.match.class.deduct]:
-      //   As an exception, the first phase in [over.match.list] (considering
-      //   initializer-list constructors) is omitted if the initializer list
-      //   consists of a single expression of type cv U, where U is a
-      //   specialization of C or a class derived from a specialization of C.
-      Expr *E = ListInit->getInit(0);
-      auto *RD = E->getType()->getAsCXXRecordDecl();
-      if (!isa<InitListExpr>(E) && RD &&
-          isCompleteType(Kind.getLocation(), E->getType()) &&
-          isOrIsDerivedFromSpecializationOf(RD, Template))
-        TryListConstructors = false;
-    }
-
-    if (TryListConstructors)
-      Result = tryToResolveOverload(/*OnlyListConstructor*/true);
-    // Then unwrap the initializer list and try again considering all
-    // constructors.
-    Inits = MultiExprArg(ListInit->getInits(), ListInit->getNumInits());
-  }
-
-  // If list-initialization fails, or if we're doing any other kind of
-  // initialization, we (eventually) consider constructors.
-  if (Result == OR_No_Viable_Function)
-    Result = tryToResolveOverload(/*OnlyListConstructor*/false);
-
-  switch (Result) {
-  case OR_Ambiguous:
-    Diag(Kind.getLocation(), diag::err_deduced_class_template_ctor_ambiguous)
-      << TemplateName;
-    // FIXME: For list-initialization candidates, it'd usually be better to
-    // list why they were not viable when given the initializer list itself as
-    // an argument.
-    Candidates.NoteCandidates(*this, OCD_ViableCandidates, Inits);
-    return QualType();
-
-  case OR_No_Viable_Function: {
-    CXXRecordDecl *Primary =
-        cast<ClassTemplateDecl>(Template)->getTemplatedDecl();
-    bool Complete =
-        isCompleteType(Kind.getLocation(), Context.getTypeDeclType(Primary));
-    Diag(Kind.getLocation(),
-         Complete ? diag::err_deduced_class_template_ctor_no_viable
-                  : diag::err_deduced_class_template_incomplete)
-      << TemplateName << !Guides.empty();
-    Candidates.NoteCandidates(*this, OCD_AllCandidates, Inits);
-    return QualType();
-  }
-
-  case OR_Deleted: {
-    Diag(Kind.getLocation(), diag::err_deduced_class_template_deleted)
-      << TemplateName;
-    NoteDeletedFunction(Best->Function);
-    return QualType();
-  }
-
-  case OR_Success:
-    // C++ [over.match.list]p1:
-    //   In copy-list-initialization, if an explicit constructor is chosen, the
-    //   initialization is ill-formed.
-    if (Kind.isCopyInit() && ListInit &&
-        cast<CXXDeductionGuideDecl>(Best->Function)->isExplicit()) {
-      bool IsDeductionGuide = !Best->Function->isImplicit();
-      Diag(Kind.getLocation(), diag::err_deduced_class_template_explicit)
-          << TemplateName << IsDeductionGuide;
-      Diag(Best->Function->getLocation(),
-           diag::note_explicit_ctor_deduction_guide_here)
-          << IsDeductionGuide;
-      return QualType();
-    }
-
-    // Make sure we didn't select an unusable deduction guide, and mark it
-    // as referenced.
-    DiagnoseUseOfDecl(Best->Function, Kind.getLocation());
-    MarkFunctionReferenced(Kind.getLocation(), Best->Function);
-    break;
-  }
-
-  // C++ [dcl.type.class.deduct]p1:
-  //  The placeholder is replaced by the return type of the function selected
-  //  by overload resolution for class template deduction.
-  QualType DeducedType =
-      SubstAutoType(TSInfo->getType(), Best->Function->getReturnType());
-  Diag(TSInfo->getTypeLoc().getBeginLoc(),
-       diag::warn_cxx14_compat_class_template_argument_deduction)
-      << TSInfo->getTypeLoc().getSourceRange() << 1 << DeducedType;
-  return DeducedType;
-}