---
 include/clang/AST/DataRecursiveASTVisitor.h |  1 +
 include/clang/AST/Expr.h                    | 18 ++++++++++++++++++
 include/clang/AST/RecursiveASTVisitor.h     |  1 +
 include/clang/Basic/StmtNodes.td            |  1 +
 include/clang/Sema/SemaInternal.h           |  3 +++
 include/clang/Sema/TypoCorrection.h         |  5 +++++
 lib/AST/Expr.cpp                            |  1 +
 lib/AST/ExprClassification.cpp              |  3 ++-
 lib/AST/ExprConstant.cpp                    |  1 +
 lib/AST/ItaniumMangle.cpp                   |  1 +
 lib/AST/StmtPrinter.cpp                     |  5 +++++
 lib/AST/StmtProfile.cpp                     |  4 ++++
 lib/Sema/SemaExceptionSpec.cpp              |  1 +
 lib/Sema/TreeTransform.h                    |  6 ++++++
 lib/Serialization/ASTReaderStmt.cpp         |  4 ++++
 lib/Serialization/ASTWriterStmt.cpp         |  6 ++++++
 lib/StaticAnalyzer/Core/ExprEngine.cpp      |  1 +
 tools/libclang/CXCursor.cpp                 |  1 +
 18 files changed, 62 insertions(+), 1 deletion(-)

diff --git a/include/clang/AST/DataRecursiveASTVisitor.h b/include/clang/AST/DataRecursiveASTVisitor.h
index 13a6dec..c4fa4e9 100644
--- a/include/clang/AST/DataRecursiveASTVisitor.h
+++ b/include/clang/AST/DataRecursiveASTVisitor.h
@@ -2237,6 +2237,7 @@ DEF_TRAVERSE_STMT(CapturedStmt, { TRY_TO(TraverseDecl(S->getCapturedDecl())); })
 
 DEF_TRAVERSE_STMT(CXXOperatorCallExpr, {})
 DEF_TRAVERSE_STMT(OpaqueValueExpr, {})
+DEF_TRAVERSE_STMT(TypoExpr, {})
 DEF_TRAVERSE_STMT(CUDAKernelCallExpr, {})
 
 // These operators (all of them) do not need any action except
diff --git a/include/clang/AST/Expr.h b/include/clang/AST/Expr.h
index b4bb0b6..8290e4b 100644
--- a/include/clang/AST/Expr.h
+++ b/include/clang/AST/Expr.h
@@ -4841,6 +4841,24 @@ public:
     return child_range(SubExprs, SubExprs+NumSubExprs);
   }
 };
+
+/// TypoExpr - Internal placeholder for expressions where typo correction
+/// still needs to be performed and/or an error diagnostic emitted.
+class TypoExpr : public Expr {
+public:
+  TypoExpr(QualType T)
+      : Expr(TypoExprClass, T, VK_LValue, OK_Ordinary,
+             /*isTypeDependent*/ true,
+             /*isValueDependent*/ true,
+             /*isInstantiationDependent*/ true,
+             /*containsUnexpandedParameterPack*/ false) {
+    assert(T->isDependentType() && "TypoExpr given a non-dependent type");
+  }
+
+  child_range children() { return child_range(); }
+  SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); }
+  SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); }
+};
 }  // end namespace clang
 
 #endif
diff --git a/include/clang/AST/RecursiveASTVisitor.h b/include/clang/AST/RecursiveASTVisitor.h
index ca66631..366f136 100644
--- a/include/clang/AST/RecursiveASTVisitor.h
+++ b/include/clang/AST/RecursiveASTVisitor.h
@@ -2259,6 +2259,7 @@ DEF_TRAVERSE_STMT(CapturedStmt, { TRY_TO(TraverseDecl(S->getCapturedDecl())); })
 
 DEF_TRAVERSE_STMT(CXXOperatorCallExpr, {})
 DEF_TRAVERSE_STMT(OpaqueValueExpr, {})
+DEF_TRAVERSE_STMT(TypoExpr, {})
 DEF_TRAVERSE_STMT(CUDAKernelCallExpr, {})
 
 // These operators (all of them) do not need any action except
diff --git a/include/clang/Basic/StmtNodes.td b/include/clang/Basic/StmtNodes.td
index 1dc7e2f..130dd34 100644
--- a/include/clang/Basic/StmtNodes.td
+++ b/include/clang/Basic/StmtNodes.td
@@ -163,6 +163,7 @@ def ShuffleVectorExpr : DStmt<Expr>;
 def ConvertVectorExpr : DStmt<Expr>;
 def BlockExpr : DStmt<Expr>;
 def OpaqueValueExpr : DStmt<Expr>;
+def TypoExpr : DStmt<Expr>;
 
 // Microsoft Extensions.
 def MSPropertyRefExpr : DStmt<Expr>;
diff --git a/include/clang/Sema/SemaInternal.h b/include/clang/Sema/SemaInternal.h
index 06db0db..e858bbe 100644
--- a/include/clang/Sema/SemaInternal.h
+++ b/include/clang/Sema/SemaInternal.h
@@ -149,6 +149,9 @@ public:
   /// in the consumer.
   TypoCorrection getNextCorrection();
 
+  ASTContext &getContext() const { return SemaRef.Context; }
+  const LookupResult &getLookupResult() const { return Result; }
+
 private:
   class NamespaceSpecifierSet {
     struct SpecifierInfo {
diff --git a/include/clang/Sema/TypoCorrection.h b/include/clang/Sema/TypoCorrection.h
index 26bf0ac..3e2c6c9 100644
--- a/include/clang/Sema/TypoCorrection.h
+++ b/include/clang/Sema/TypoCorrection.h
@@ -336,6 +336,11 @@ public:
   }
 };
 
+class TypoDiagnosticGenerator {
+ public:
+  virtual void operator()(TypoCorrection &&TC) = 0;
+  virtual ~TypoDiagnosticGenerator() = default;
+};
 }
 
 #endif
diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index 1e52e53..95adf94 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -2850,6 +2850,7 @@ bool Expr::HasSideEffects(const ASTContext &Ctx) const {
   case PackExpansionExprClass:
   case SubstNonTypeTemplateParmPackExprClass:
   case FunctionParmPackExprClass:
+  case TypoExprClass:
     llvm_unreachable("shouldn't see dependent / unresolved nodes here");
 
   case DeclRefExprClass:
diff --git a/lib/AST/ExprClassification.cpp b/lib/AST/ExprClassification.cpp
index d3d2530..4e2e3ea 100644
--- a/lib/AST/ExprClassification.cpp
+++ b/lib/AST/ExprClassification.cpp
@@ -124,10 +124,11 @@ static Cl::Kinds ClassifyInternal(ASTContext &Ctx, const Expr *E) {
   case Expr::ObjCPropertyRefExprClass:
     // C++ [expr.typeid]p1: The result of a typeid expression is an lvalue of...
   case Expr::CXXTypeidExprClass:
-    // Unresolved lookups get classified as lvalues.
+    // Unresolved lookups and uncorrected typos get classified as lvalues.
     // FIXME: Is this wise? Should they get their own kind?
   case Expr::UnresolvedLookupExprClass:
   case Expr::UnresolvedMemberExprClass:
+  case Expr::TypoExprClass:
   case Expr::CXXDependentScopeMemberExprClass:
   case Expr::DependentScopeDeclRefExprClass:
     // ObjC instance variables are lvalues
diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index 538fc57..e089d33 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -8339,6 +8339,7 @@ static ICEDiag CheckICE(const Expr* E, const ASTContext &Ctx) {
   case Expr::CXXDeleteExprClass:
   case Expr::CXXPseudoDestructorExprClass:
   case Expr::UnresolvedLookupExprClass:
+  case Expr::TypoExprClass:
   case Expr::DependentScopeDeclRefExprClass:
   case Expr::CXXConstructExprClass:
   case Expr::CXXStdInitializerListExprClass:
diff --git a/lib/AST/ItaniumMangle.cpp b/lib/AST/ItaniumMangle.cpp
index da83d71..c5250c9 100644
--- a/lib/AST/ItaniumMangle.cpp
+++ b/lib/AST/ItaniumMangle.cpp
@@ -2610,6 +2610,7 @@ recurse:
   case Expr::ParenListExprClass:
   case Expr::LambdaExprClass:
   case Expr::MSPropertyRefExprClass:
+  case Expr::TypoExprClass:  // This should no longer exist in the AST by now.
     llvm_unreachable("unexpected statement kind");
 
   // FIXME: invent manglings for all these.
diff --git a/lib/AST/StmtPrinter.cpp b/lib/AST/StmtPrinter.cpp
index 1d1b2bc..95c8587 100644
--- a/lib/AST/StmtPrinter.cpp
+++ b/lib/AST/StmtPrinter.cpp
@@ -2164,6 +2164,11 @@ void StmtPrinter::VisitOpaqueValueExpr(OpaqueValueExpr *Node) {
   PrintExpr(Node->getSourceExpr());
 }
 
+void StmtPrinter::VisitTypoExpr(TypoExpr *Node) {
+  // TODO: Print something reasonable for a TypoExpr, if necessary.
+  assert(false && "Cannot print TypoExpr nodes");
+}
+
 void StmtPrinter::VisitAsTypeExpr(AsTypeExpr *Node) {
   OS << "__builtin_astype(";
   PrintExpr(Node->getSrcExpr());
diff --git a/lib/AST/StmtProfile.cpp b/lib/AST/StmtProfile.cpp
index 76c7843..3798271 100644
--- a/lib/AST/StmtProfile.cpp
+++ b/lib/AST/StmtProfile.cpp
@@ -1209,6 +1209,10 @@ void StmtProfiler::VisitOpaqueValueExpr(const OpaqueValueExpr *E) {
   VisitExpr(E);  
 }
 
+void StmtProfiler::VisitTypoExpr(const TypoExpr *E) {
+  VisitExpr(E);
+}
+
 void StmtProfiler::VisitObjCStringLiteral(const ObjCStringLiteral *S) {
   VisitExpr(S);
 }
diff --git a/lib/Sema/SemaExceptionSpec.cpp b/lib/Sema/SemaExceptionSpec.cpp
index b92fcbd..afe9e03 100644
--- a/lib/Sema/SemaExceptionSpec.cpp
+++ b/lib/Sema/SemaExceptionSpec.cpp
@@ -1071,6 +1071,7 @@ CanThrowResult Sema::canThrow(const Expr *E) {
   case Expr::UnaryExprOrTypeTraitExprClass:
   case Expr::UnresolvedLookupExprClass:
   case Expr::UnresolvedMemberExprClass:
+  case Expr::TypoExprClass:
     // FIXME: Can any of the above throw?  If so, when?
     return CT_Cannot;
 
diff --git a/lib/Sema/TreeTransform.h b/lib/Sema/TreeTransform.h
index c1a7a48..f18cee0 100644
--- a/lib/Sema/TreeTransform.h
+++ b/lib/Sema/TreeTransform.h
@@ -7212,6 +7212,12 @@ TreeTransform<Derived>::TransformOpaqueValueExpr(OpaqueValueExpr *E) {
 
 template<typename Derived>
 ExprResult
+TreeTransform<Derived>::TransformTypoExpr(TypoExpr *E) {
+  return E;
+}
+
+template<typename Derived>
+ExprResult
 TreeTransform<Derived>::TransformPseudoObjectExpr(PseudoObjectExpr *E) {
   // Rebuild the syntactic form.  The original syntactic form has
   // opaque-value expressions in it, so strip those away and rebuild
diff --git a/lib/Serialization/ASTReaderStmt.cpp b/lib/Serialization/ASTReaderStmt.cpp
index c4e88f0..bdd51e2 100644
--- a/lib/Serialization/ASTReaderStmt.cpp
+++ b/lib/Serialization/ASTReaderStmt.cpp
@@ -1585,6 +1585,10 @@ void ASTStmtReader::VisitOpaqueValueExpr(OpaqueValueExpr *E) {
   E->Loc = ReadSourceLocation(Record, Idx);
 }
 
+void ASTStmtReader::VisitTypoExpr(TypoExpr *E) {
+  llvm_unreachable("Cannot read TypoExpr nodes");
+}
+
 //===----------------------------------------------------------------------===//
 // Microsoft Expressions and Statements
 //===----------------------------------------------------------------------===//
diff --git a/lib/Serialization/ASTWriterStmt.cpp b/lib/Serialization/ASTWriterStmt.cpp
index 462271a..1521117 100644
--- a/lib/Serialization/ASTWriterStmt.cpp
+++ b/lib/Serialization/ASTWriterStmt.cpp
@@ -1585,6 +1585,12 @@ void ASTStmtWriter::VisitOpaqueValueExpr(OpaqueValueExpr *E) {
   Code = serialization::EXPR_OPAQUE_VALUE;
 }
 
+void ASTStmtWriter::VisitTypoExpr(TypoExpr *E) {
+  VisitExpr(E);
+  // TODO: Figure out sane writer behavior for a TypoExpr, if necessary
+  assert(false && "Cannot write TypoExpr nodes");
+}
+
 //===----------------------------------------------------------------------===//
 // CUDA Expressions and Statements.
 //===----------------------------------------------------------------------===//
diff --git a/lib/StaticAnalyzer/Core/ExprEngine.cpp b/lib/StaticAnalyzer/Core/ExprEngine.cpp
index f4636ef..143bdbd 100644
--- a/lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ b/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -693,6 +693,7 @@ void ExprEngine::Visit(const Stmt *S, ExplodedNode *Pred,
     case Stmt::ExpressionTraitExprClass:
     case Stmt::UnresolvedLookupExprClass:
     case Stmt::UnresolvedMemberExprClass:
+    case Stmt::TypoExprClass:
     case Stmt::CXXNoexceptExprClass:
     case Stmt::PackExpansionExprClass:
     case Stmt::SubstNonTypeTemplateParmPackExprClass:
diff --git a/tools/libclang/CXCursor.cpp b/tools/libclang/CXCursor.cpp
index a20cc4a..5ddd0d9 100644
--- a/tools/libclang/CXCursor.cpp
+++ b/tools/libclang/CXCursor.cpp
@@ -468,6 +468,7 @@ CXCursor cxcursor::MakeCXCursor(const Stmt *S, const Decl *Parent,
   case Stmt::SubstNonTypeTemplateParmPackExprClass:
   case Stmt::FunctionParmPackExprClass:
   case Stmt::UnresolvedLookupExprClass:
+  case Stmt::TypoExprClass: // A typo could actually be a DeclRef or a MemberRef
     K = CXCursor_DeclRefExpr;
     break;
       
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