diff --git a/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.cpp b/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.cpp
--- a/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.cpp
@@ -785,8 +785,8 @@
                                                    const LambdaCapture *C,
                                                    Expr *Init) {
   if (C->capturesVariable()) {
-    const VarDecl *VDecl = C->getCapturedVar();
-    if (areSameVariable(IndexVar, cast<ValueDecl>(VDecl))) {
+    const ValueDecl *VDecl = C->getCapturedVar();
+    if (areSameVariable(IndexVar, VDecl)) {
       // FIXME: if the index is captured, it will count as an usage and the
       // alias (if any) won't work, because it is only used in case of having
       // exactly one usage.
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -431,6 +431,9 @@
   that can be used for such compatibility. The demangler now demangles
   symbols with named module attachment.
 
+- Support capturing structured bindings in lambdas
+  (`P1091R3 <https://wg21.link/p1091r3>`_ and `P1381R1 <https://wg21.link/P1381R1>`)
+
 C++2b Feature Support
 ^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/clang/include/clang/AST/DeclCXX.h b/clang/include/clang/AST/DeclCXX.h
--- a/clang/include/clang/AST/DeclCXX.h
+++ b/clang/include/clang/AST/DeclCXX.h
@@ -1057,8 +1057,9 @@
   ///
   /// \note No entries will be added for init-captures, as they do not capture
   /// variables.
-  void getCaptureFields(llvm::DenseMap<const VarDecl *, FieldDecl *> &Captures,
-                        FieldDecl *&ThisCapture) const;
+  void
+  getCaptureFields(llvm::DenseMap<const ValueDecl *, FieldDecl *> &Captures,
+                   FieldDecl *&ThisCapture) const;
 
   using capture_const_iterator = const LambdaCapture *;
   using capture_const_range = llvm::iterator_range<capture_const_iterator>;
diff --git a/clang/include/clang/AST/LambdaCapture.h b/clang/include/clang/AST/LambdaCapture.h
--- a/clang/include/clang/AST/LambdaCapture.h
+++ b/clang/include/clang/AST/LambdaCapture.h
@@ -71,7 +71,7 @@
   /// capture that is a pack expansion, or an invalid source
   /// location to indicate that this is not a pack expansion.
   LambdaCapture(SourceLocation Loc, bool Implicit, LambdaCaptureKind Kind,
-                VarDecl *Var = nullptr,
+                ValueDecl *Var = nullptr,
                 SourceLocation EllipsisLoc = SourceLocation());
 
   /// Determine the kind of capture.
@@ -86,7 +86,7 @@
 
   /// Determine whether this capture handles a variable.
   bool capturesVariable() const {
-    return isa_and_nonnull<VarDecl>(DeclAndBits.getPointer());
+    return isa_and_nonnull<ValueDecl>(DeclAndBits.getPointer());
   }
 
   /// Determine whether this captures a variable length array bound
@@ -101,9 +101,9 @@
   ///
   /// This operation is only valid if this capture is a variable capture
   /// (other than a capture of \c this).
-  VarDecl *getCapturedVar() const {
+  ValueDecl *getCapturedVar() const {
     assert(capturesVariable() && "No variable available for capture");
-    return static_cast<VarDecl *>(DeclAndBits.getPointer());
+    return static_cast<ValueDecl *>(DeclAndBits.getPointer());
   }
 
   /// Determine whether this was an implicit capture (not
diff --git a/clang/include/clang/AST/Stmt.h b/clang/include/clang/AST/Stmt.h
--- a/clang/include/clang/AST/Stmt.h
+++ b/clang/include/clang/AST/Stmt.h
@@ -59,6 +59,7 @@
 class StringLiteral;
 class Token;
 class VarDecl;
+class ValueDecl;
 
 //===----------------------------------------------------------------------===//
 // AST classes for statements.
diff --git a/clang/include/clang/ASTMatchers/ASTMatchers.h b/clang/include/clang/ASTMatchers/ASTMatchers.h
--- a/clang/include/clang/ASTMatchers/ASTMatchers.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -4690,7 +4690,7 @@
 /// In the matcher
 /// lambdaExpr(hasAnyCapture(lambdaCapture(capturesVar(hasName("x")))),
 /// capturesVar(hasName("x")) matches `x` and `x = 1`.
-AST_MATCHER_P(LambdaCapture, capturesVar, internal::Matcher<VarDecl>,
+AST_MATCHER_P(LambdaCapture, capturesVar, internal::Matcher<ValueDecl>,
               InnerMatcher) {
   auto *capturedVar = Node.getCapturedVar();
   return capturedVar && InnerMatcher.matches(*capturedVar, Finder, Builder);
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -9016,6 +9016,16 @@
 def err_reference_to_local_in_enclosing_context : Error<
   "reference to local %select{variable|binding}1 %0 declared in enclosing "
   "%select{%3|block literal|lambda expression|context}2">;
+def err_bitfield_capture_by_ref : Error<
+  "cannot capture a bit-field by reference">;
+def err_capture_binding_openmp : Error<
+  "capturing a structured binding is not yet supported in OpenMP">;
+def ext_capture_binding : ExtWarn<
+  "captured structured bindings are a C++20 extension">, InGroup<CXX20>;
+def warn_cxx17_compat_capture_binding : Warning<
+  "captured structured bindings are incompatible with "
+  "C++ standards before C++20">,
+  InGroup<CXXPre20Compat>, DefaultIgnore;
 
 def err_static_data_member_not_allowed_in_local_class : Error<
   "static data member %0 not allowed in local %sub{select_tag_type_kind}2 %1">;
diff --git a/clang/include/clang/Sema/ScopeInfo.h b/clang/include/clang/Sema/ScopeInfo.h
--- a/clang/include/clang/Sema/ScopeInfo.h
+++ b/clang/include/clang/Sema/ScopeInfo.h
@@ -548,7 +548,7 @@
     const VariableArrayType *CapturedVLA;
 
     /// Otherwise, the captured variable (if any).
-    VarDecl *CapturedVar;
+    ValueDecl *CapturedVar;
   };
 
   /// The source location at which the first capture occurred.
@@ -584,12 +584,13 @@
   unsigned Invalid : 1;
 
 public:
-  Capture(VarDecl *Var, bool Block, bool ByRef, bool IsNested,
+  Capture(ValueDecl *Var, bool Block, bool ByRef, bool IsNested,
           SourceLocation Loc, SourceLocation EllipsisLoc, QualType CaptureType,
           bool Invalid)
       : CapturedVar(Var), Loc(Loc), EllipsisLoc(EllipsisLoc),
-        CaptureType(CaptureType),
-        Kind(Block ? Cap_Block : ByRef ? Cap_ByRef : Cap_ByCopy),
+        CaptureType(CaptureType), Kind(Block   ? Cap_Block
+                                       : ByRef ? Cap_ByRef
+                                               : Cap_ByCopy),
         Nested(IsNested), CapturesThis(false), ODRUsed(false),
         NonODRUsed(false), Invalid(Invalid) {}
 
@@ -634,7 +635,7 @@
       NonODRUsed = true;
   }
 
-  VarDecl *getVariable() const {
+  ValueDecl *getVariable() const {
     assert(isVariableCapture());
     return CapturedVar;
   }
@@ -673,7 +674,7 @@
       : FunctionScopeInfo(Diag), ImpCaptureStyle(Style) {}
 
   /// CaptureMap - A map of captured variables to (index+1) into Captures.
-  llvm::DenseMap<VarDecl*, unsigned> CaptureMap;
+  llvm::DenseMap<ValueDecl *, unsigned> CaptureMap;
 
   /// CXXThisCaptureIndex - The (index+1) of the capture of 'this';
   /// zero if 'this' is not captured.
@@ -690,7 +691,7 @@
   /// or null if unknown.
   QualType ReturnType;
 
-  void addCapture(VarDecl *Var, bool isBlock, bool isByref, bool isNested,
+  void addCapture(ValueDecl *Var, bool isBlock, bool isByref, bool isNested,
                   SourceLocation Loc, SourceLocation EllipsisLoc,
                   QualType CaptureType, bool Invalid) {
     Captures.push_back(Capture(Var, isBlock, isByref, isNested, Loc,
@@ -717,23 +718,21 @@
   }
 
   /// Determine whether the given variable has been captured.
-  bool isCaptured(VarDecl *Var) const {
-    return CaptureMap.count(Var);
-  }
+  bool isCaptured(ValueDecl *Var) const { return CaptureMap.count(Var); }
 
   /// Determine whether the given variable-array type has been captured.
   bool isVLATypeCaptured(const VariableArrayType *VAT) const;
 
   /// Retrieve the capture of the given variable, if it has been
   /// captured already.
-  Capture &getCapture(VarDecl *Var) {
+  Capture &getCapture(ValueDecl *Var) {
     assert(isCaptured(Var) && "Variable has not been captured");
     return Captures[CaptureMap[Var] - 1];
   }
 
-  const Capture &getCapture(VarDecl *Var) const {
-    llvm::DenseMap<VarDecl*, unsigned>::const_iterator Known
-      = CaptureMap.find(Var);
+  const Capture &getCapture(ValueDecl *Var) const {
+    llvm::DenseMap<ValueDecl *, unsigned>::const_iterator Known =
+        CaptureMap.find(Var);
     assert(Known != CaptureMap.end() && "Variable has not been captured");
     return Captures[Known->second - 1];
   }
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -5210,23 +5210,23 @@
   ///
   /// \returns true if an error occurred (i.e., the variable cannot be
   /// captured) and false if the capture succeeded.
-  bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc, TryCaptureKind Kind,
-                          SourceLocation EllipsisLoc, bool BuildAndDiagnose,
-                          QualType &CaptureType,
+  bool tryCaptureVariable(ValueDecl *Var, SourceLocation Loc,
+                          TryCaptureKind Kind, SourceLocation EllipsisLoc,
+                          bool BuildAndDiagnose, QualType &CaptureType,
                           QualType &DeclRefType,
                           const unsigned *const FunctionScopeIndexToStopAt);
 
   /// Try to capture the given variable.
-  bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
+  bool tryCaptureVariable(ValueDecl *Var, SourceLocation Loc,
                           TryCaptureKind Kind = TryCapture_Implicit,
                           SourceLocation EllipsisLoc = SourceLocation());
 
   /// Checks if the variable must be captured.
-  bool NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc);
+  bool NeedToCaptureVariable(ValueDecl *Var, SourceLocation Loc);
 
   /// Given a variable, determine the type that a reference to that
   /// variable will have in the given scope.
-  QualType getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc);
+  QualType getCapturedDeclRefType(ValueDecl *Var, SourceLocation Loc);
 
   /// Mark all of the declarations referenced within a particular AST node as
   /// referenced. Used when template instantiation instantiates a non-dependent
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -1007,7 +1007,7 @@
 
 template <>
 Expected<LambdaCapture> ASTNodeImporter::import(const LambdaCapture &From) {
-  VarDecl *Var = nullptr;
+  ValueDecl *Var = nullptr;
   if (From.capturesVariable()) {
     if (auto VarOrErr = import(From.getCapturedVar()))
       Var = *VarOrErr;
diff --git a/clang/lib/AST/DeclCXX.cpp b/clang/lib/AST/DeclCXX.cpp
--- a/clang/lib/AST/DeclCXX.cpp
+++ b/clang/lib/AST/DeclCXX.cpp
@@ -1556,8 +1556,8 @@
 }
 
 void CXXRecordDecl::getCaptureFields(
-       llvm::DenseMap<const VarDecl *, FieldDecl *> &Captures,
-       FieldDecl *&ThisCapture) const {
+    llvm::DenseMap<const ValueDecl *, FieldDecl *> &Captures,
+    FieldDecl *&ThisCapture) const {
   Captures.clear();
   ThisCapture = nullptr;
 
diff --git a/clang/lib/AST/ExprCXX.cpp b/clang/lib/AST/ExprCXX.cpp
--- a/clang/lib/AST/ExprCXX.cpp
+++ b/clang/lib/AST/ExprCXX.cpp
@@ -1087,7 +1087,7 @@
     : Expr(SC, Empty), NumArgs(NumArgs) {}
 
 LambdaCapture::LambdaCapture(SourceLocation Loc, bool Implicit,
-                             LambdaCaptureKind Kind, VarDecl *Var,
+                             LambdaCaptureKind Kind, ValueDecl *Var,
                              SourceLocation EllipsisLoc)
     : DeclAndBits(Var, 0), Loc(Loc), EllipsisLoc(EllipsisLoc) {
   unsigned Bits = 0;
@@ -1211,7 +1211,8 @@
 }
 
 bool LambdaExpr::isInitCapture(const LambdaCapture *C) const {
-  return (C->capturesVariable() && C->getCapturedVar()->isInitCapture() &&
+  return (C->capturesVariable() && isa<VarDecl>(C->getCapturedVar()) &&
+          cast<VarDecl>(C->getCapturedVar())->isInitCapture() &&
           (getCallOperator() == C->getCapturedVar()->getDeclContext()));
 }
 
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -578,7 +578,7 @@
 
     /// LambdaCaptureFields - Mapping from captured variables/this to
     /// corresponding data members in the closure class.
-    llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields;
+    llvm::DenseMap<const ValueDecl *, FieldDecl *> LambdaCaptureFields;
     FieldDecl *LambdaThisCaptureField;
 
     CallStackFrame(EvalInfo &Info, SourceLocation CallLoc,
diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -2072,7 +2072,7 @@
       OS << "...";
 
     if (Node->isInitCapture(C)) {
-      VarDecl *D = C->getCapturedVar();
+      VarDecl *D = cast<VarDecl>(C->getCapturedVar());
 
       llvm::StringRef Pre;
       llvm::StringRef Post;
diff --git a/clang/lib/Analysis/AnalysisDeclContext.cpp b/clang/lib/Analysis/AnalysisDeclContext.cpp
--- a/clang/lib/Analysis/AnalysisDeclContext.cpp
+++ b/clang/lib/Analysis/AnalysisDeclContext.cpp
@@ -169,8 +169,8 @@
     if (!LC.capturesVariable())
       continue;
 
-    VarDecl *VD = LC.getCapturedVar();
-    if (isSelfDecl(VD))
+    ValueDecl *VD = LC.getCapturedVar();
+    if (isSelfDecl(dyn_cast<VarDecl>(VD)))
       return dyn_cast<ImplicitParamDecl>(VD);
   }
 
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -1495,7 +1495,7 @@
     if (C.capturesVariable()) {
       SourceLocation Loc = C.getLocation();
       assert(!Field->isBitField() && "lambdas don't have bitfield members!");
-      VarDecl *V = C.getCapturedVar();
+      ValueDecl *V = C.getCapturedVar();
       StringRef VName = V->getName();
       llvm::DIFile *VUnit = getOrCreateFile(Loc);
       auto Align = getDeclAlignIfRequired(V, CGM.getContext());
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -2930,8 +2930,14 @@
   // FIXME: While we're emitting a binding from an enclosing scope, all other
   // DeclRefExprs we see should be implicitly treated as if they also refer to
   // an enclosing scope.
-  if (const auto *BD = dyn_cast<BindingDecl>(ND))
+  if (const auto *BD = dyn_cast<BindingDecl>(ND)) {
+    if (E->refersToEnclosingVariableOrCapture()) {
+      auto *FD = LambdaCaptureFields.lookup(BD);
+      assert(FD);
+      return EmitCapturedFieldLValue(*this, FD, CXXABIThisValue);
+    }
     return EmitLValue(BD->getBinding());
+  }
 
   // We can form DeclRefExprs naming GUID declarations when reconstituting
   // non-type template parameters into expressions.
diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.cpp b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
--- a/clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -409,7 +409,7 @@
 /// RAII for emitting code of OpenMP constructs.
 class InlinedOpenMPRegionRAII {
   CodeGenFunction &CGF;
-  llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields;
+  llvm::DenseMap<const ValueDecl *, FieldDecl *> LambdaCaptureFields;
   FieldDecl *LambdaThisCaptureField = nullptr;
   const CodeGen::CGBlockInfo *BlockInfo = nullptr;
   bool NoInheritance = false;
@@ -8949,7 +8949,7 @@
     Address VDAddr(Arg, CGF.ConvertTypeForMem(VDType),
                    CGF.getContext().getDeclAlign(VD));
     LValue VDLVal = CGF.MakeAddrLValue(VDAddr, VDType);
-    llvm::DenseMap<const VarDecl *, FieldDecl *> Captures;
+    llvm::DenseMap<const ValueDecl *, FieldDecl *> Captures;
     FieldDecl *ThisCapture = nullptr;
     RD->getCaptureFields(Captures, ThisCapture);
     if (ThisCapture) {
@@ -8971,7 +8971,7 @@
     for (const LambdaCapture &LC : RD->captures()) {
       if (!LC.capturesVariable())
         continue;
-      const VarDecl *VD = LC.getCapturedVar();
+      const VarDecl *VD = cast<VarDecl>(LC.getCapturedVar());
       if (LC.getCaptureKind() != LCK_ByRef && !VD->getType()->isPointerType())
         continue;
       auto It = Captures.find(VD);
diff --git a/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp b/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
--- a/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
@@ -3810,7 +3810,7 @@
     else
       VDLVal = CGF.MakeAddrLValue(
           VDAddr, VD->getType().getCanonicalType().getNonReferenceType());
-    llvm::DenseMap<const VarDecl *, FieldDecl *> Captures;
+    llvm::DenseMap<const ValueDecl *, FieldDecl *> Captures;
     FieldDecl *ThisCapture = nullptr;
     RD->getCaptureFields(Captures, ThisCapture);
     if (ThisCapture && CGF.CapturedStmtInfo->isCXXThisExprCaptured()) {
@@ -3822,13 +3822,15 @@
     for (const LambdaCapture &LC : RD->captures()) {
       if (LC.getCaptureKind() != LCK_ByRef)
         continue;
-      const VarDecl *VD = LC.getCapturedVar();
-      if (!CS->capturesVariable(VD))
+      const ValueDecl *VD = LC.getCapturedVar();
+      // FIXME: For now VD is always a VarDecl because OpenMP does not support
+      //  capturing structured bindings in lambdas yet.
+      if (!CS->capturesVariable(cast<VarDecl>(VD)))
         continue;
       auto It = Captures.find(VD);
       assert(It != Captures.end() && "Found lambda capture without field.");
       LValue VarLVal = CGF.EmitLValueForFieldInitialization(VDLVal, It->second);
-      Address VDAddr = CGF.GetAddrOfLocalVar(VD);
+      Address VDAddr = CGF.GetAddrOfLocalVar(cast<VarDecl>(VD));
       if (VD->getType().getCanonicalType()->isReferenceType())
         VDAddr = CGF.EmitLoadOfReferenceLValue(VDAddr,
                                                VD->getType().getCanonicalType())
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -609,7 +609,7 @@
   const CodeGen::CGBlockInfo *BlockInfo = nullptr;
   llvm::Value *BlockPointer = nullptr;
 
-  llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields;
+  llvm::DenseMap<const ValueDecl *, FieldDecl *> LambdaCaptureFields;
   FieldDecl *LambdaThisCaptureField = nullptr;
 
   /// A mapping from NRVO variables to the flags used to indicate
diff --git a/clang/lib/Sema/ScopeInfo.cpp b/clang/lib/Sema/ScopeInfo.cpp
--- a/clang/lib/Sema/ScopeInfo.cpp
+++ b/clang/lib/Sema/ScopeInfo.cpp
@@ -220,7 +220,8 @@
 bool Capture::isInitCapture() const {
   // Note that a nested capture of an init-capture is not itself an
   // init-capture.
-  return !isNested() && isVariableCapture() && getVariable()->isInitCapture();
+  return !isNested() && isVariableCapture() && isa<VarDecl>(getVariable()) &&
+         cast<VarDecl>(getVariable())->isInitCapture();
 }
 
 bool CapturingScopeInfo::isVLATypeCaptured(const VariableArrayType *VAT) const {
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -14514,9 +14514,11 @@
   auto I = LambdaClass->field_begin();
   for (const auto &C : LambdaClass->captures()) {
     if (C.capturesVariable()) {
-      VarDecl *VD = C.getCapturedVar();
-      if (VD->isInitCapture())
-        S.CurrentInstantiationScope->InstantiatedLocal(VD, VD);
+      ValueDecl *VD = C.getCapturedVar();
+      if (VarDecl *Var = dyn_cast<VarDecl>(VD)) {
+        if (Var->isInitCapture())
+          S.CurrentInstantiationScope->InstantiatedLocal(VD, VD);
+      }
       const bool ByRef = C.getCaptureKind() == LCK_ByRef;
       LSI->addCapture(VD, /*IsBlock*/false, ByRef,
           /*RefersToEnclosingVariableOrCapture*/true, C.getLocation(),
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -2082,9 +2082,8 @@
                        NestedNameSpecifierLoc NNS, NamedDecl *FoundD,
                        SourceLocation TemplateKWLoc,
                        const TemplateArgumentListInfo *TemplateArgs) {
-  bool RefersToCapturedVariable =
-      isa<VarDecl>(D) &&
-      NeedToCaptureVariable(cast<VarDecl>(D), NameInfo.getLoc());
+  bool RefersToCapturedVariable = isa<VarDecl, BindingDecl>(D) &&
+                                  NeedToCaptureVariable(D, NameInfo.getLoc());
 
   DeclRefExpr *E = DeclRefExpr::Create(
       Context, NNS, TemplateKWLoc, D, RefersToCapturedVariable, NameInfo, Ty,
@@ -3415,13 +3414,13 @@
     // These are always lvalues.
     valueKind = VK_LValue;
     type = type.getNonReferenceType();
-    // FIXME: Support lambda-capture of BindingDecls, once CWG actually
-    // decides how that's supposed to work.
     auto *BD = cast<BindingDecl>(VD);
-    if (BD->getDeclContext() != CurContext) {
-      auto *DD = dyn_cast_or_null<VarDecl>(BD->getDecomposedDecl());
-      if (DD && DD->hasLocalStorage())
-        diagnoseUncapturableValueReference(*this, Loc, BD);
+    auto *DD = dyn_cast_or_null<VarDecl>(BD->getDecomposedDecl());
+    if (DD && DD->hasLocalStorage()) {
+      if ((!LangOpts.CPlusPlus || !isLambdaCallOperator(CurContext)) &&
+          BD->getDeclContext() != CurContext) {
+        diagnoseUncapturableValueReference(*this, Loc, VD);
+      }
     }
     break;
   }
@@ -16312,7 +16311,7 @@
     if (Cap.isInvalid() || Cap.isThisCapture())
       continue;
 
-    VarDecl *Var = Cap.getVariable();
+    VarDecl *Var = cast<VarDecl>(Cap.getVariable());
     Expr *CopyExpr = nullptr;
     if (getLangOpts().CPlusPlus && Cap.isCopyCapture()) {
       if (const RecordType *Record =
@@ -18143,8 +18142,8 @@
   MarkVarDeclODRUsed(Capture, Loc, *this, &CapturingScopeIndex);
 }
 
-static void diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
-                                               ValueDecl *var) {
+void diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
+                                        ValueDecl *var) {
   DeclContext *VarDC = var->getDeclContext();
 
   //  If the parameter still belongs to the translation unit, then
@@ -18184,12 +18183,12 @@
   // capture.
 }
 
-
-static bool isVariableAlreadyCapturedInScopeInfo(CapturingScopeInfo *CSI, VarDecl *Var,
-                                      bool &SubCapturesAreNested,
-                                      QualType &CaptureType,
-                                      QualType &DeclRefType) {
-   // Check whether we've already captured it.
+static bool isVariableAlreadyCapturedInScopeInfo(CapturingScopeInfo *CSI,
+                                                 ValueDecl *Var,
+                                                 bool &SubCapturesAreNested,
+                                                 QualType &CaptureType,
+                                                 QualType &DeclRefType) {
+  // Check whether we've already captured it.
   if (CSI->CaptureMap.count(Var)) {
     // If we found a capture, any subcaptures are nested.
     SubCapturesAreNested = true;
@@ -18216,14 +18215,16 @@
 
 // Only block literals, captured statements, and lambda expressions can
 // capture; other scopes don't work.
-static DeclContext *getParentOfCapturingContextOrNull(DeclContext *DC, VarDecl *Var,
-                                 SourceLocation Loc,
-                                 const bool Diagnose, Sema &S) {
+static DeclContext *getParentOfCapturingContextOrNull(DeclContext *DC,
+                                                      ValueDecl *Var,
+                                                      SourceLocation Loc,
+                                                      const bool Diagnose,
+                                                      Sema &S) {
   if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC) || isLambdaCallOperator(DC))
     return getLambdaAwareParentOfDeclContext(DC);
-  else if (Var->hasLocalStorage()) {
-    if (Diagnose)
-       diagnoseUncapturableValueReference(S, Loc, Var);
+  else if (VarDecl *VD = dyn_cast<VarDecl>(Var)) {
+    if (VD->hasLocalStorage() && Diagnose)
+      diagnoseUncapturableValueReference(S, Loc, VD);
   }
   return nullptr;
 }
@@ -18231,9 +18232,12 @@
 // Certain capturing entities (lambdas, blocks etc.) are not allowed to capture
 // certain types of variables (unnamed, variably modified types etc.)
 // so check for eligibility.
-static bool isVariableCapturable(CapturingScopeInfo *CSI, VarDecl *Var,
-                                 SourceLocation Loc,
-                                 const bool Diagnose, Sema &S) {
+static bool isVariableCapturable(CapturingScopeInfo *CSI, ValueDecl *Var,
+                                 SourceLocation Loc, const bool Diagnose,
+                                 Sema &S) {
+
+  assert((isa<VarDecl>(Var) || isa<BindingDecl>(Var)) &&
+         "Only variables and structured bindings can be captured");
 
   bool IsBlock = isa<BlockScopeInfo>(CSI);
   bool IsLambda = isa<LambdaScopeInfo>(CSI);
@@ -18290,17 +18294,26 @@
     return false;
   }
 
+  if (isa<BindingDecl>(Var)) {
+    if (!IsLambda || !S.getLangOpts().CPlusPlus) {
+      return false;
+    } else if (Diagnose && S.getLangOpts().CPlusPlus) {
+      S.Diag(Loc, S.LangOpts.CPlusPlus20
+                      ? diag::warn_cxx17_compat_capture_binding
+                      : diag::ext_capture_binding)
+          << Var;
+      S.Diag(Var->getLocation(), diag::note_entity_declared_at) << Var;
+    }
+  }
+
   return true;
 }
 
 // Returns true if the capture by block was successful.
-static bool captureInBlock(BlockScopeInfo *BSI, VarDecl *Var,
-                                 SourceLocation Loc,
-                                 const bool BuildAndDiagnose,
-                                 QualType &CaptureType,
-                                 QualType &DeclRefType,
-                                 const bool Nested,
-                                 Sema &S, bool Invalid) {
+static bool captureInBlock(BlockScopeInfo *BSI, ValueDecl *Var,
+                           SourceLocation Loc, const bool BuildAndDiagnose,
+                           QualType &CaptureType, QualType &DeclRefType,
+                           const bool Nested, Sema &S, bool Invalid) {
   bool ByRef = false;
 
   // Blocks are not allowed to capture arrays, excepting OpenCL.
@@ -18364,10 +18377,9 @@
   return !Invalid;
 }
 
-
 /// Capture the given variable in the captured region.
 static bool captureInCapturedRegion(
-    CapturedRegionScopeInfo *RSI, VarDecl *Var, SourceLocation Loc,
+    CapturedRegionScopeInfo *RSI, ValueDecl *Var, SourceLocation Loc,
     const bool BuildAndDiagnose, QualType &CaptureType, QualType &DeclRefType,
     const bool RefersToCapturedVariable, Sema::TryCaptureKind Kind,
     bool IsTopScope, Sema &S, bool Invalid) {
@@ -18406,16 +18418,12 @@
 }
 
 /// Capture the given variable in the lambda.
-static bool captureInLambda(LambdaScopeInfo *LSI,
-                            VarDecl *Var,
-                            SourceLocation Loc,
-                            const bool BuildAndDiagnose,
-                            QualType &CaptureType,
-                            QualType &DeclRefType,
+static bool captureInLambda(LambdaScopeInfo *LSI, ValueDecl *Var,
+                            SourceLocation Loc, const bool BuildAndDiagnose,
+                            QualType &CaptureType, QualType &DeclRefType,
                             const bool RefersToCapturedVariable,
                             const Sema::TryCaptureKind Kind,
-                            SourceLocation EllipsisLoc,
-                            const bool IsTopScope,
+                            SourceLocation EllipsisLoc, const bool IsTopScope,
                             Sema &S, bool Invalid) {
   // Determine whether we are capturing by reference or by value.
   bool ByRef = false;
@@ -18424,6 +18432,43 @@
   } else {
     ByRef = (LSI->ImpCaptureStyle == LambdaScopeInfo::ImpCap_LambdaByref);
   }
+  // C++20 : [expr.prim.lambda.capture]p12
+  // A bit-field or a member of an anonymous union shall
+  // not be captured by reference.
+  MemberExpr *ME = nullptr;
+  BindingDecl *BD = nullptr;
+  if (VarDecl *V = dyn_cast_or_null<VarDecl>(Var)) {
+    if (V->getInit())
+      ME = dyn_cast<MemberExpr>(V->getInit()->IgnoreImplicit());
+  } else if ((BD = dyn_cast<BindingDecl>(Var))) {
+    ME = dyn_cast_or_null<MemberExpr>(BD->getBinding());
+  }
+
+  // Capturing a bitfield by reference is not allowed
+  // except in OpenMP mode
+  if (ByRef && ME &&
+      (isa<BindingDecl>(Var) || !S.LangOpts.OpenMP ||
+       !S.isOpenMPCapturedDecl(Var))) {
+    FieldDecl *FD = dyn_cast_or_null<FieldDecl>(ME->getMemberDecl());
+    if (FD &&
+        (FD->isBitField() || (FD->getParent()->isAnonymousStructOrUnion() &&
+                              FD->getParent()->isUnion()))) {
+      if (BuildAndDiagnose) {
+        S.Diag(Loc, diag::err_bitfield_capture_by_ref) << Var;
+        S.Diag(Var->getLocation(), diag::note_entity_declared_at) << Var;
+        S.Diag(FD->getLocation(), diag::note_bitfield_decl) << FD;
+      }
+      Invalid = true;
+    }
+  }
+  // FIXME: We should support capturing structured bindings in OpenMP
+  if (!Invalid && BD && S.LangOpts.OpenMP) {
+    if (BuildAndDiagnose) {
+      S.Diag(Loc, diag::err_capture_binding_openmp) << Var;
+      S.Diag(Var->getLocation(), diag::note_entity_declared_at) << Var;
+    }
+    Invalid = true;
+  }
 
   // Compute the type of the field that will capture this variable.
   if (ByRef) {
@@ -18505,7 +18550,8 @@
   return !Invalid;
 }
 
-static bool canCaptureVariableByCopy(VarDecl *Var, const ASTContext &Context) {
+static bool canCaptureVariableByCopy(ValueDecl *Var,
+                                     const ASTContext &Context) {
   // Offer a Copy fix even if the type is dependent.
   if (Var->getType()->isDependentType())
     return true;
@@ -18531,7 +18577,7 @@
 /// standard, for example we can't emit a default copy capture fix-it if we
 /// already explicitly copy capture capture another variable.
 static void buildLambdaCaptureFixit(Sema &Sema, LambdaScopeInfo *LSI,
-                                    VarDecl *Var) {
+                                    ValueDecl *Var) {
   assert(LSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None);
   // Don't offer Capture by copy of default capture by copy fixes if Var is
   // known not to be copy constructible.
@@ -18607,14 +18653,21 @@
 }
 
 bool Sema::tryCaptureVariable(
-    VarDecl *Var, SourceLocation ExprLoc, TryCaptureKind Kind,
+    ValueDecl *Var, SourceLocation ExprLoc, TryCaptureKind Kind,
     SourceLocation EllipsisLoc, bool BuildAndDiagnose, QualType &CaptureType,
     QualType &DeclRefType, const unsigned *const FunctionScopeIndexToStopAt) {
   // An init-capture is notionally from the context surrounding its
   // declaration, but its parent DC is the lambda class.
   DeclContext *VarDC = Var->getDeclContext();
-  if (Var->isInitCapture())
-    VarDC = VarDC->getParent();
+  VarDecl *VD = dyn_cast<VarDecl>(Var);
+  if (VD) {
+    if (VD && VD->isInitCapture())
+      VarDC = VarDC->getParent();
+  } else {
+    VD = dyn_cast<DecompositionDecl>(
+        cast<BindingDecl>(Var)->getDecomposedDecl());
+  }
+  assert(VD && "Cannot capture a null variable");
 
   DeclContext *DC = CurContext;
   const unsigned MaxFunctionScopesIndex = FunctionScopeIndexToStopAt
@@ -18636,12 +18689,14 @@
 
   // Capture global variables if it is required to use private copy of this
   // variable.
-  bool IsGlobal = !Var->hasLocalStorage();
+  bool IsGlobal = !VD->hasLocalStorage();
   if (IsGlobal &&
       !(LangOpts.OpenMP && isOpenMPCapturedDecl(Var, /*CheckScopeInfo=*/true,
                                                 MaxFunctionScopesIndex)))
     return true;
-  Var = Var->getCanonicalDecl();
+
+  if (isa<VarDecl>(Var))
+    Var = cast<VarDecl>(Var->getCanonicalDecl());
 
   // Walk up the stack to determine whether we can capture the variable,
   // performing the "simple" checks that don't depend on type. We stop when
@@ -18845,7 +18900,7 @@
   return Invalid;
 }
 
-bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
+bool Sema::tryCaptureVariable(ValueDecl *Var, SourceLocation Loc,
                               TryCaptureKind Kind, SourceLocation EllipsisLoc) {
   QualType CaptureType;
   QualType DeclRefType;
@@ -18854,7 +18909,7 @@
                             DeclRefType, nullptr);
 }
 
-bool Sema::NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc) {
+bool Sema::NeedToCaptureVariable(ValueDecl *Var, SourceLocation Loc) {
   QualType CaptureType;
   QualType DeclRefType;
   return !tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
@@ -18862,7 +18917,7 @@
                              DeclRefType, nullptr);
 }
 
-QualType Sema::getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc) {
+QualType Sema::getCapturedDeclRefType(ValueDecl *Var, SourceLocation Loc) {
   QualType CaptureType;
   QualType DeclRefType;
 
@@ -19458,6 +19513,24 @@
   }
 }
 
+static void DoMarkBindingDeclReferenced(Sema &SemaRef, SourceLocation Loc,
+                                        BindingDecl *BD) {
+  BD->setReferenced();
+
+  if (BD->isInvalidDecl())
+    return;
+
+  OdrUseContext OdrUse = isOdrUseContext(SemaRef);
+  if (OdrUse == OdrUseContext::Used) {
+    QualType CaptureType, DeclRefType;
+    SemaRef.tryCaptureVariable(BD, Loc, Sema::TryCapture_Implicit,
+                               /*EllipsisLoc*/ SourceLocation(),
+                               /*BuildAndDiagnose*/ true, CaptureType,
+                               DeclRefType,
+                               /*FunctionScopeIndexToStopAt*/ nullptr);
+  }
+}
+
 /// Mark a variable referenced, and check whether it is odr-used
 /// (C++ [basic.def.odr]p2, C99 6.9p3).  Note that this should not be
 /// used directly for normal expressions referring to VarDecl.
@@ -19477,6 +19550,11 @@
     return;
   }
 
+  if (BindingDecl *Decl = dyn_cast<BindingDecl>(D)) {
+    DoMarkBindingDeclReferenced(SemaRef, Loc, Decl);
+    return;
+  }
+
   SemaRef.MarkAnyDeclReferenced(Loc, D, MightBeOdrUse);
 
   // If this is a call to a method via a cast, also mark the method in the
diff --git a/clang/lib/Sema/SemaInit.cpp b/clang/lib/Sema/SemaInit.cpp
--- a/clang/lib/Sema/SemaInit.cpp
+++ b/clang/lib/Sema/SemaInit.cpp
@@ -7815,9 +7815,11 @@
           break;
         // FIXME: We can't easily tell apart an init-capture from a nested
         // capture of an init-capture.
-        const VarDecl *VD = Elem.Capture->getCapturedVar();
+        const ValueDecl *VD = Elem.Capture->getCapturedVar();
+        bool InitCapture =
+            isa<VarDecl>(VD) && cast<VarDecl>(VD)->isInitCapture();
         Diag(Elem.Capture->getLocation(), diag::note_lambda_capture_initializer)
-            << VD << VD->isInitCapture() << Elem.Capture->isExplicit()
+            << VD << InitCapture << Elem.Capture->isExplicit()
             << (Elem.Capture->getCaptureKind() == LCK_ByRef) << VD
             << nextPathEntryRange(Path, I + 1, L);
         break;
diff --git a/clang/lib/Sema/SemaLambda.cpp b/clang/lib/Sema/SemaLambda.cpp
--- a/clang/lib/Sema/SemaLambda.cpp
+++ b/clang/lib/Sema/SemaLambda.cpp
@@ -1088,7 +1088,7 @@
     if (C->Init.isInvalid())
       continue;
 
-    VarDecl *Var = nullptr;
+    ValueDecl *Var = nullptr;
     if (C->Init.isUsable()) {
       Diag(C->Loc, getLangOpts().CPlusPlus14
                        ? diag::warn_cxx11_compat_init_capture
@@ -1166,7 +1166,10 @@
           continue;
       }
 
-      Var = R.getAsSingle<VarDecl>();
+      if (auto BD = R.getAsSingle<BindingDecl>())
+        Var = BD;
+      else
+        Var = R.getAsSingle<VarDecl>();
       if (Var && DiagnoseUseOfDecl(Var, C->Loc))
         continue;
     }
@@ -1200,7 +1203,14 @@
     if (Var->isInvalidDecl())
       continue;
 
-    if (!Var->hasLocalStorage()) {
+    VarDecl *Underlying;
+    if (isa<BindingDecl>(Var)) {
+      Underlying = dyn_cast_or_null<VarDecl>(
+          cast<BindingDecl>(Var)->getDecomposedDecl());
+    } else
+      Underlying = cast<VarDecl>(Var);
+
+    if (!Underlying->hasLocalStorage()) {
       Diag(C->Loc, diag::err_capture_non_automatic_variable) << C->Id;
       Diag(Var->getLocation(), diag::note_previous_decl) << C->Id;
       continue;
@@ -1224,7 +1234,7 @@
     }
 
     if (C->Init.isUsable()) {
-      addInitCapture(LSI, Var);
+      addInitCapture(LSI, cast<VarDecl>(Var));
     } else {
       TryCaptureKind Kind = C->Kind == LCK_ByRef ? TryCapture_ExplicitByRef :
                                                    TryCapture_ExplicitByVal;
@@ -1574,7 +1584,7 @@
 
   // An init-capture is initialized directly from its stored initializer.
   if (Cap.isInitCapture())
-    return Cap.getVariable()->getInit();
+    return cast<VarDecl>(Cap.getVariable())->getInit();
 
   // For anything else, build an initialization expression. For an implicit
   // capture, the capture notionally happens at the capture-default, so use
@@ -1605,7 +1615,7 @@
       Init = This;
   } else {
     assert(Cap.isVariableCapture() && "unknown kind of capture");
-    VarDecl *Var = Cap.getVariable();
+    ValueDecl *Var = Cap.getVariable();
     Name = Var->getIdentifier();
     Init = BuildDeclarationNameExpr(
       CXXScopeSpec(), DeclarationNameInfo(Var->getDeclName(), Loc), Var);
@@ -1654,7 +1664,7 @@
 
 bool Sema::CaptureHasSideEffects(const Capture &From) {
   if (From.isInitCapture()) {
-    Expr *Init = From.getVariable()->getInit();
+    Expr *Init = cast<VarDecl>(From.getVariable())->getInit();
     if (Init && Init->HasSideEffects(Context))
       return true;
   }
@@ -1704,9 +1714,9 @@
 
   TypeSourceInfo *TSI = nullptr;
   if (Capture.isVariableCapture()) {
-    auto *Var = Capture.getVariable();
-    if (Var->isInitCapture())
-      TSI = Capture.getVariable()->getTypeSourceInfo();
+    VarDecl *Var = llvm::dyn_cast_or_null<VarDecl>(Capture.getVariable());
+    if (Var && Var->isInitCapture())
+      TSI = Var->getTypeSourceInfo();
   }
 
   // FIXME: Should we really be doing this? A null TypeSourceInfo seems more
@@ -1854,7 +1864,7 @@
           return LambdaCapture(From.getLocation(), IsImplicit, LCK_VLAType);
         } else {
           assert(From.isVariableCapture() && "unknown kind of capture");
-          VarDecl *Var = From.getVariable();
+          ValueDecl *Var = From.getVariable();
           LambdaCaptureKind Kind =
               From.isCopyCapture() ? LCK_ByCopy : LCK_ByRef;
           return LambdaCapture(From.getLocation(), IsImplicit, Kind, Var,
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -4521,12 +4521,12 @@
       DSAStack->setForceCaptureByReferenceInTargetExecutable(
           /*V=*/true);
       if (RD->isLambda()) {
-        llvm::DenseMap<const VarDecl *, FieldDecl *> Captures;
+        llvm::DenseMap<const ValueDecl *, FieldDecl *> Captures;
         FieldDecl *ThisCapture;
         RD->getCaptureFields(Captures, ThisCapture);
         for (const LambdaCapture &LC : RD->captures()) {
           if (LC.getCaptureKind() == LCK_ByRef) {
-            VarDecl *VD = LC.getCapturedVar();
+            VarDecl *VD = cast<VarDecl>(LC.getCapturedVar());
             DeclContext *VDC = VD->getDeclContext();
             if (!VDC->Encloses(CurContext))
               continue;
diff --git a/clang/lib/Sema/SemaStmt.cpp b/clang/lib/Sema/SemaStmt.cpp
--- a/clang/lib/Sema/SemaStmt.cpp
+++ b/clang/lib/Sema/SemaStmt.cpp
@@ -4689,11 +4689,11 @@
       if (S.getLangOpts().OpenMP && RSI->CapRegionKind == CR_OpenMP)
         S.setOpenMPCaptureKind(Field, Cap.getVariable(), RSI->OpenMPLevel);
 
-      Captures.push_back(CapturedStmt::Capture(Cap.getLocation(),
-                                               Cap.isReferenceCapture()
-                                                   ? CapturedStmt::VCK_ByRef
-                                                   : CapturedStmt::VCK_ByCopy,
-                                               Cap.getVariable()));
+      Captures.push_back(CapturedStmt::Capture(
+          Cap.getLocation(),
+          Cap.isReferenceCapture() ? CapturedStmt::VCK_ByRef
+                                   : CapturedStmt::VCK_ByCopy,
+          cast<VarDecl>(Cap.getVariable())));
     }
     CaptureInits.push_back(Init.get());
   }
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -12931,7 +12931,7 @@
       continue;
 
     TransformedInitCapture &Result = InitCaptures[C - E->capture_begin()];
-    VarDecl *OldVD = C->getCapturedVar();
+    VarDecl *OldVD = cast<VarDecl>(C->getCapturedVar());
 
     auto SubstInitCapture = [&](SourceLocation EllipsisLoc,
                                 Optional<unsigned> NumExpansions) {
@@ -12948,7 +12948,8 @@
           getSema().buildLambdaInitCaptureInitialization(
               C->getLocation(), OldVD->getType()->isReferenceType(),
               EllipsisLoc, NumExpansions, OldVD->getIdentifier(),
-              C->getCapturedVar()->getInitStyle() != VarDecl::CInit,
+              cast<VarDecl>(C->getCapturedVar())->getInitStyle() !=
+                  VarDecl::CInit,
               NewExprInit);
       Result.Expansions.push_back(
           InitCaptureInfoTy(NewExprInit, NewInitCaptureType));
@@ -13115,7 +13116,7 @@
     if (E->isInitCapture(C)) {
       TransformedInitCapture &NewC = InitCaptures[C - E->capture_begin()];
 
-      VarDecl *OldVD = C->getCapturedVar();
+      VarDecl *OldVD = cast<VarDecl>(C->getCapturedVar());
       llvm::SmallVector<Decl*, 4> NewVDs;
 
       for (InitCaptureInfoTy &Info : NewC.Expansions) {
@@ -13170,7 +13171,7 @@
         // The transform has determined that we should perform an expansion;
         // transform and capture each of the arguments.
         // expansion of the pattern. Do so.
-        VarDecl *Pack = C->getCapturedVar();
+        VarDecl *Pack = cast<VarDecl>(C->getCapturedVar());
         for (unsigned I = 0; I != *NumExpansions; ++I) {
           Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(getSema(), I);
           VarDecl *CapturedVar
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -5781,7 +5781,7 @@
         break;
       case LCK_ByCopy:
       case LCK_ByRef:
-        VarDecl *Var =
+        ValueDecl *Var =
             Capture.capturesVariable() ? Capture.getCapturedVar() : nullptr;
         AddDeclRef(Var);
         AddSourceLocation(Capture.isPackExpansion() ? Capture.getEllipsisLoc()
diff --git a/clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
--- a/clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/DeadStoresChecker.cpp
@@ -504,7 +504,7 @@
   // Treat local variables captured by reference in C++ lambdas as escaped.
   void findLambdaReferenceCaptures(const LambdaExpr *LE)  {
     const CXXRecordDecl *LambdaClass = LE->getLambdaClass();
-    llvm::DenseMap<const VarDecl *, FieldDecl *> CaptureFields;
+    llvm::DenseMap<const ValueDecl *, FieldDecl *> CaptureFields;
     FieldDecl *ThisCaptureField;
     LambdaClass->getCaptureFields(CaptureFields, ThisCaptureField);
 
@@ -512,14 +512,14 @@
       if (!C.capturesVariable())
         continue;
 
-      VarDecl *VD = C.getCapturedVar();
+      ValueDecl *VD = C.getCapturedVar();
       const FieldDecl *FD = CaptureFields[VD];
-      if (!FD)
+      if (!FD || !isa<VarDecl>(VD))
         continue;
 
       // If the capture field is a reference type, it is capture-by-reference.
       if (FD->getType()->isReferenceType())
-        Escaped.insert(VD);
+        Escaped.insert(cast<VarDecl>(VD));
     }
   }
 };
diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedLambdaCapturesChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedLambdaCapturesChecker.cpp
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedLambdaCapturesChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedLambdaCapturesChecker.cpp
@@ -57,7 +57,7 @@
   void visitLambdaExpr(LambdaExpr *L) const {
     for (const LambdaCapture &C : L->captures()) {
       if (C.capturesVariable()) {
-        VarDecl *CapturedVar = C.getCapturedVar();
+        ValueDecl *CapturedVar = C.getCapturedVar();
         if (auto *CapturedVarType = CapturedVar->getType().getTypePtrOrNull()) {
           Optional<bool> IsUncountedPtr = isUncountedPtr(CapturedVarType);
           if (IsUncountedPtr && *IsUncountedPtr) {
@@ -68,7 +68,7 @@
     }
   }
 
-  void reportBug(const LambdaCapture &Capture, VarDecl *CapturedVar,
+  void reportBug(const LambdaCapture &Capture, ValueDecl *CapturedVar,
                  const Type *T) const {
     assert(CapturedVar);
 
diff --git a/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp b/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
--- a/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ b/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -2548,7 +2548,7 @@
         MD->getParent()->isLambda()) {
       // Lookup the field of the lambda.
       const CXXRecordDecl *CXXRec = MD->getParent();
-      llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields;
+      llvm::DenseMap<const ValueDecl *, FieldDecl *> LambdaCaptureFields;
       FieldDecl *LambdaThisCaptureField;
       CXXRec->getCaptureFields(LambdaCaptureFields, LambdaThisCaptureField);
 
diff --git a/clang/lib/StaticAnalyzer/Core/LoopUnrolling.cpp b/clang/lib/StaticAnalyzer/Core/LoopUnrolling.cpp
--- a/clang/lib/StaticAnalyzer/Core/LoopUnrolling.cpp
+++ b/clang/lib/StaticAnalyzer/Core/LoopUnrolling.cpp
@@ -175,7 +175,7 @@
   const CXXRecordDecl *LambdaCXXRec = MD->getParent();
 
   // Lookup the fields of the lambda
-  llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields;
+  llvm::DenseMap<const ValueDecl *, FieldDecl *> LambdaCaptureFields;
   FieldDecl *LambdaThisCaptureField;
   LambdaCXXRec->getCaptureFields(LambdaCaptureFields, LambdaThisCaptureField);
 
diff --git a/clang/test/CodeGenCXX/cxx20-decomposition.cpp b/clang/test/CodeGenCXX/cxx20-decomposition.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGenCXX/cxx20-decomposition.cpp
@@ -0,0 +1,42 @@
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-linux-gnu -emit-llvm %s -o - | FileCheck %s
+
+struct S {
+    int i;
+    int j;
+};
+
+
+
+int f() {
+    auto [i, j] = S{1, 42};
+    return [j, &i] {
+        i++;
+        return i + j;
+    }();
+}
+
+// CHECK-LABEL: define{{.*}} i32 @_Z1fv()
+// CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %0, ptr align 4 @__const._Z1fv., i64 8, i1 false)
+// CHECK: %1 = getelementptr inbounds %class.anon, ptr %ref.tmp, i32 0, i32 0
+// CHECK: %j = getelementptr inbounds %struct.S, ptr %0, i32 0, i32 1
+// CHECK: %2 = load i32, ptr %j, align 4
+// CHECK: store i32 %2, ptr %1, align 8
+// CHECK: %3 = getelementptr inbounds %class.anon, ptr %ref.tmp, i32 0, i32 1
+// CHECK: %i = getelementptr inbounds %struct.S, ptr %0, i32 0, i32 0
+// CHECK: store ptr %i, ptr %3, align 8
+// CHECK: %call = call noundef i32 @"_ZZ1fvENK3$_0clEv"(ptr noundef nonnull align 8 dereferenceable(16) %ref.tmp)
+// CHECK: ret i32 %call
+
+// CHECK-LABEL: define{{.*}} i32 @"_ZZ1fvENK3$_0clEv"(
+// CHECK: %0 = getelementptr inbounds %class.anon, ptr %this1, i32 0, i32 1
+// CHECK: %1 = load ptr, ptr %0, align 8
+// CHECK: %2 = load i32, ptr %1, align 4
+// CHECK: %inc = add nsw i32 %2, 1
+// CHECK: store i32 %inc, ptr %1, align 4
+// CHECK: %3 = getelementptr inbounds %class.anon, ptr %this1, i32 0, i32 1
+// CHECK: %4 = load ptr, ptr %3, align 8
+// CHECK: %5 = load i32, ptr %4, align 4
+// CHECK: %6 = getelementptr inbounds %class.anon, ptr %this1, i32 0, i32 0
+// CHECK: %7 = load i32, ptr %6, align 8
+// CHECK: %add = add nsw i32 %5, %7
+// CHECK: ret i32 %add
diff --git a/clang/test/SemaCXX/cxx1z-decomposition.cpp b/clang/test/SemaCXX/cxx1z-decomposition.cpp
--- a/clang/test/SemaCXX/cxx1z-decomposition.cpp
+++ b/clang/test/SemaCXX/cxx1z-decomposition.cpp
@@ -1,4 +1,5 @@
-// RUN: %clang_cc1 -std=c++17 -verify %s
+// RUN: %clang_cc1 -std=c++17 -Wc++20-extensions -verify=expected %s
+// RUN: %clang_cc1 -std=c++20 -Wpre-c++20-compat -verify=expected %s
 
 void use_from_own_init() {
   auto [a] = a; // expected-error {{binding 'a' cannot appear in the initializer of its own decomposition declaration}}
@@ -46,25 +47,58 @@
 }
 static_assert(f({1, 2}) == 12);
 
-constexpr bool g(S &&s) { 
+constexpr bool g(S &&s) {
   auto &[a, b] = s;
   return &a == &s.a && &b == &s.b && &a != &b;
 }
 static_assert(g({1, 2}));
 
-auto [outer1, outer2] = S{1, 2};
+struct S1 {
+  int a, b;
+};
+struct S2 {
+  int a : 1; // expected-note 2{{bit-field is declared here}}
+  int b;
+};
+
+auto [outer1, outer2] = S1{1, 2};
+auto [outerbit1, outerbit2] = S1{1, 2}; // expected-note {{declared here}}
+
 void enclosing() {
   struct S { int a = outer1; };
-  auto [n] = S(); // expected-note 2{{'n' declared here}}
+  auto [n] = S(); // expected-note 3{{'n' declared here}}
+
+  struct Q {
+    int f() { return n; } // expected-error {{reference to local binding 'n' declared in enclosing function 'enclosing'}}
+  };
+
+  (void)[&] { return n; }; // expected-warning {{C++20}}
+  (void)[n] { return n; }; // expected-warning {{C++20}}
 
-  struct Q { int f() { return n; } }; // expected-error {{reference to local binding 'n' declared in enclosing function}}
-  (void) [&] { return n; }; // expected-error {{reference to local binding 'n' declared in enclosing function}}
-  (void) [n] {}; // expected-error {{'n' in capture list does not name a variable}}
+  static auto [m] = S(); // expected-note {{'m' declared here}} \
+                         // expected-warning {{C++20}}
 
-  static auto [m] = S(); // expected-warning {{extension}}
   struct R { int f() { return m; } };
   (void) [&] { return m; };
-  (void) [m] {}; // expected-error {{'m' in capture list does not name a variable}}
+  (void)[m]{}; // expected-error {{'m' cannot be captured because it does not have automatic storage duration}}
+
+  (void)[outerbit1]{}; // expected-error {{'outerbit1' cannot be captured because it does not have automatic storage duration}}
+
+  auto [bit, var] = S2{1, 1}; // expected-note 4{{'bit' declared here}}
+
+  (void)[&bit] { // expected-error {{cannot capture a bit-field by reference}} \
+                    // expected-warning {{C++20}}
+    return bit;
+  };
+
+  union { // expected-note {{declared here}}
+    int u;
+  };
+
+  (void)[&] { return bit + u; } // expected-error {{unnamed variable cannot be implicitly captured in a lambda expression}} \
+                                // expected-error {{cannot capture a bit-field by reference}} \
+                                // expected-warning {{C++20}}
+  ();
 }
 
 void bitfield() {
@@ -98,7 +132,7 @@
 
 struct PR37352 {
   int n;
-  void f() { static auto [a] = *this; } // expected-warning {{C++20 extension}}
+  void f() { static auto [a] = *this; } // expected-warning {{C++20}}
 };
 
 namespace instantiate_template {
diff --git a/clang/test/SemaCXX/cxx20-decomposition.cpp b/clang/test/SemaCXX/cxx20-decomposition.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/SemaCXX/cxx20-decomposition.cpp
@@ -0,0 +1,46 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++20 -verify %s
+// expected-no-diagnostics
+
+template <typename, typename>
+constexpr bool is_same = false;
+template <typename T>
+constexpr bool is_same<T, T> = true;
+
+struct S {
+  int i;
+  int &j;
+};
+
+void check_category() {
+  int a = 42;
+  {
+    auto [v, r] = S{1, a};
+    (void)[ v, r ] {
+      static_assert(is_same<decltype(v), int>);
+      static_assert(is_same<decltype(r), int &>);
+    };
+  }
+  {
+    auto [v, r] = S{1, a};
+    (void)[&v, &r ] {
+      static_assert(is_same<decltype(v), int>);
+      static_assert(is_same<decltype(r), int &>);
+    };
+  }
+  {
+    S s{1, a};
+    const auto &[v, r] = s;
+    (void)[ v, r ] {
+      static_assert(is_same<decltype(v), const int>);
+      static_assert(is_same<decltype(r), int &>);
+    };
+  }
+  {
+    S s{1, a};
+    const auto &[v, r] = s;
+    (void)[&v, &r ] {
+      static_assert(is_same<decltype(v), const int>);
+      static_assert(is_same<decltype(r), int &>);
+    };
+  }
+}
diff --git a/clang/test/SemaCXX/decomposition-blocks.cpp b/clang/test/SemaCXX/decomposition-blocks.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/SemaCXX/decomposition-blocks.cpp
@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify %s -fblocks
+
+struct S {
+  int i : 1;
+  int j;
+};
+
+void run(void (^)());
+void test() {
+  auto [i, j] = S{1, 42}; // expected-note {{'i' declared here}}
+  run(^{
+    (void)i; // expected-error {{reference to local binding 'i' declared in enclosing function 'test'}}
+  });
+}
diff --git a/clang/test/SemaCXX/decomposition-openmp.cpp b/clang/test/SemaCXX/decomposition-openmp.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/SemaCXX/decomposition-openmp.cpp
@@ -0,0 +1,13 @@
+
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++20 -fopenmp %s
+
+// FIXME: OpenMP should support capturing structured bindings
+auto f() {
+  int i[2] = {};
+  auto [a, b] = i; // expected-note 2{{declared here}}
+  return [=, &a] {
+    // expected-error@-1 {{capturing a structured binding is not yet supported in OpenMP}}
+    return a + b;
+    // expected-error@-1 {{capturing a structured binding is not yet supported in OpenMP}}
+  };
+}
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -3449,9 +3449,11 @@
            C != CEnd; ++C) {
         if (!C->capturesVariable())
           continue;
-
-        if (Visit(MakeCursorVariableRef(C->getCapturedVar(), C->getLocation(),
-                                        TU)))
+        // TODO: hamdle structured bindings here ?
+        if (!isa<VarDecl>(C->getCapturedVar()))
+          continue;
+        if (Visit(MakeCursorVariableRef(cast<VarDecl>(C->getCapturedVar()),
+                                        C->getLocation(), TU)))
           return true;
       }
       // Visit init captures
diff --git a/clang/www/cxx_status.html b/clang/www/cxx_status.html
--- a/clang/www/cxx_status.html
+++ b/clang/www/cxx_status.html
@@ -1144,7 +1144,7 @@
     <tr>
       <td rowspan="2">Structured binding extensions</td>
       <td><a href="https://wg21.link/p1091r3">P1091R3</a></td>
-      <td rowspan="2" class="partial" align="center">Partial</td>
+      <td rowspan="2" class="unreleased" align="center">Clang 15</td>
     </tr>
       <tr>
         <td><a href="https://wg21.link/p1381r1">P1381R1</a></td>