When we know that we are parsing a class-name, implicitly construct a
TypenameType if getTypeName is looking at a member of an unknown
specialization. This allows us to properly parse class templates that
derived from type that could only otherwise be described by a typename type, 
e.g.,

  template<class T> struct X {};
  template<typename T> struct Y : public X<T>::X { }; 

Fixes PR4381.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80123 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/MinimalAction.cpp b/lib/Parse/MinimalAction.cpp
index 6c8d75c..4e32de3 100644
--- a/lib/Parse/MinimalAction.cpp
+++ b/lib/Parse/MinimalAction.cpp
@@ -143,7 +143,8 @@
 /// FIXME: Use the passed CXXScopeSpec for accurate C++ type checking.
 Action::TypeTy *
 MinimalAction::getTypeName(IdentifierInfo &II, SourceLocation Loc,
-                           Scope *S, const CXXScopeSpec *SS) {
+                           Scope *S, const CXXScopeSpec *SS,
+                           bool isClassName) {
   if (TypeNameInfo *TI = II.getFETokenInfo<TypeNameInfo>())
     if (TI->isTypeName)
       return TI;
diff --git a/lib/Parse/ParseDecl.cpp b/lib/Parse/ParseDecl.cpp
index c29f601..25bed09 100644
--- a/lib/Parse/ParseDecl.cpp
+++ b/lib/Parse/ParseDecl.cpp
@@ -2248,7 +2248,7 @@
       } else if (Tok.is(tok::tilde)) {
         // This should be a C++ destructor.
         SourceLocation TildeLoc = ConsumeToken();
-        if (Tok.is(tok::identifier)) {
+        if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id)) {
           // FIXME: Inaccurate.
           SourceLocation NameLoc = Tok.getLocation();
           SourceLocation EndLoc;
diff --git a/lib/Parse/ParseDeclCXX.cpp b/lib/Parse/ParseDeclCXX.cpp
index 3a82868..0a97825 100644
--- a/lib/Parse/ParseDeclCXX.cpp
+++ b/lib/Parse/ParseDeclCXX.cpp
@@ -457,7 +457,8 @@
 
   // We have an identifier; check whether it is actually a type.
   TypeTy *Type = Actions.getTypeName(*Tok.getIdentifierInfo(), 
-                                     Tok.getLocation(), CurScope, SS);
+                                     Tok.getLocation(), CurScope, SS,
+                                     true);
   if (!Type) {
     Diag(Tok, DestrExpected ? diag::err_destructor_class_name 
                             : diag::err_expected_class_name);