4 files changed, 32 insertions, 14 deletions

diff --git a/lib/AST/Decl.cpp b/lib/AST/Decl.cpp
index a6996a4bfe..bdc804722c 100644
--- a/lib/AST/Decl.cpp
+++ b/lib/AST/Decl.cpp
@@ -289,6 +289,10 @@ bool NamedDecl::declarationReplaces(NamedDecl *OldD) const {
   if (isa<ObjCInterfaceDecl>(this) && isa<ObjCCompatibleAliasDecl>(OldD))
     return true;
 
+  if (isa<UsingShadowDecl>(this) && isa<UsingShadowDecl>(OldD))
+    return cast<UsingShadowDecl>(this)->getTargetDecl() ==
+           cast<UsingShadowDecl>(OldD)->getTargetDecl();
+
   // For non-function declarations, if the declarations are of the
   // same kind then this must be a redeclaration, or semantic analysis
   // would not have given us the new declaration.
@@ -308,7 +312,7 @@ bool NamedDecl::hasLinkage() const {
 NamedDecl *NamedDecl::getUnderlyingDecl() {
   NamedDecl *ND = this;
   while (true) {
-    if (UsingDecl *UD = dyn_cast<UsingDecl>(ND))
+    if (UsingShadowDecl *UD = dyn_cast<UsingShadowDecl>(ND))
       ND = UD->getTargetDecl();
     else if (ObjCCompatibleAliasDecl *AD
               = dyn_cast<ObjCCompatibleAliasDecl>(ND))
diff --git a/lib/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index 6cfdcdd3e5..da3b19df5b 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -97,7 +97,7 @@ bool Decl::isTemplateParameterPack() const {
 }
 
 bool Decl::isFunctionOrFunctionTemplate() const {
-  if (const UsingDecl *UD = dyn_cast<UsingDecl>(this))
+  if (const UsingShadowDecl *UD = dyn_cast<UsingShadowDecl>(this))
     return UD->getTargetDecl()->isFunctionOrFunctionTemplate();
 
   return isa<FunctionDecl>(this) || isa<FunctionTemplateDecl>(this);
@@ -189,10 +189,11 @@ ASTContext &Decl::getASTContext() const {
 
 unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
   switch (DeclKind) {
-    default:
-      if (DeclKind >= FunctionFirst && DeclKind <= FunctionLast)
-        return IDNS_Ordinary;
-      assert(0 && "Unknown decl kind!");
+    case Function:
+    case CXXMethod:
+    case CXXConstructor:
+    case CXXDestructor:
+    case CXXConversion:
     case OverloadedFunction:
     case Typedef:
     case EnumConstant:
@@ -200,8 +201,6 @@ unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
     case ImplicitParam:
     case ParmVar:
     case NonTypeTemplateParm:
-    case Using:
-    case UnresolvedUsing:
     case ObjCMethod:
     case ObjCContainer:
     case ObjCCategory:
@@ -210,6 +209,15 @@ unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
     case ObjCCompatibleAlias:
       return IDNS_Ordinary;
 
+    case UsingShadow:
+      return 0; // we'll actually overwrite this later
+
+    case UnresolvedUsing:
+      return IDNS_Tag | IDNS_Ordinary | IDNS_Using;
+
+    case Using:
+      return IDNS_Using;
+
     case ObjCProtocol:
       return IDNS_ObjCProtocol;
 
@@ -256,6 +264,8 @@ unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
     case ClassTemplatePartialSpecialization:
       return 0;
   }
+
+  return 0;
 }
 
 void Decl::addAttr(Attr *NewAttr) {
diff --git a/lib/AST/DeclCXX.cpp b/lib/AST/DeclCXX.cpp
index 3768796627..520206d248 100644
--- a/lib/AST/DeclCXX.cpp
+++ b/lib/AST/DeclCXX.cpp
@@ -914,11 +914,10 @@ NamespaceAliasDecl *NamespaceAliasDecl::Create(ASTContext &C, DeclContext *DC,
 }
 
 UsingDecl *UsingDecl::Create(ASTContext &C, DeclContext *DC,
-      SourceLocation L, SourceRange NNR, SourceLocation TargetNL,
-      SourceLocation UL, NamedDecl* Target,
-      NestedNameSpecifier* TargetNNS, bool IsTypeNameArg) {
-  return new (C) UsingDecl(DC, L, NNR, TargetNL, UL, Target,
-      TargetNNS, IsTypeNameArg);
+      SourceLocation L, SourceRange NNR, SourceLocation UL,
+      NestedNameSpecifier* TargetNNS, DeclarationName Name,
+      bool IsTypeNameArg) {
+  return new (C) UsingDecl(DC, L, NNR, UL, TargetNNS, Name, IsTypeNameArg);
 }
 
 UnresolvedUsingDecl *UnresolvedUsingDecl::Create(ASTContext &C, DeclContext *DC,
diff --git a/lib/AST/DeclPrinter.cpp b/lib/AST/DeclPrinter.cpp
index b88a971f1e..199ed356d6 100644
--- a/lib/AST/DeclPrinter.cpp
+++ b/lib/AST/DeclPrinter.cpp
@@ -73,6 +73,7 @@ namespace {
     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
     void VisitUnresolvedUsingDecl(UnresolvedUsingDecl *D);
     void VisitUsingDecl(UsingDecl *D);
+    void VisitUsingShadowDecl(UsingShadowDecl *D);
   };
 }
 
@@ -825,7 +826,7 @@ void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
   Out << "using ";
   D->getTargetNestedNameDecl()->print(Out, Policy);
-  Out << D->getTargetDecl()->getNameAsString();
+  Out << D->getNameAsString();
 }
 
 void DeclPrinter::VisitUnresolvedUsingDecl(UnresolvedUsingDecl *D) {
@@ -833,3 +834,7 @@ void DeclPrinter::VisitUnresolvedUsingDecl(UnresolvedUsingDecl *D) {
   D->getTargetNestedNameSpecifier()->print(Out, Policy);
   Out << D->getTargetName().getAsString();
 }
+
+void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
+  // ignore
+}