When checking a set of template parameter lists against a

nested-name-specifier, re-evaluate the nested-name-specifier as if we
were entering that context (which we did!), so that we'll resolve a
template-id to a particular class template partial
specialization. Fixes PR9913.

llvm-svn: 131383

clang/lib/Sema/SemaCXXScopeSpec.cpp

@@ -423,7 +423,7 @@ bool Sema::BuildCXXNestedNameSpecifier(Scope *S,
       //   class-name or namespace-name. [...]
       //
       // Qualified name lookup into a class will not find a namespace-name,
-      // so we do not need to diagnoste that case specifically. However,
+      // so we do not need to diagnose that case specifically. However,
       // this qualified name lookup may find nothing. In that case, perform
       // unqualified name lookup in the given scope (if available) or
       // reconstruct the result from when name lookup was performed at template

clang/lib/Sema/SemaTemplate.cpp

@@ -1513,8 +1513,13 @@ Sema::MatchTemplateParametersToScopeSpecifier(SourceLocation DeclStartLoc,
   // by the nested-name-specifier and walking out until we run out of types.
   llvm::SmallVector<QualType, 4> NestedTypes;
   QualType T;
-  if (SS.getScopeRep())
+  if (SS.getScopeRep()) {
+    if (CXXRecordDecl *Record 
+              = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true)))
+      T = Context.getTypeDeclType(Record);
+    else
       T = QualType(SS.getScopeRep()->getAsType(), 0);
+  }
   
   // If we found an explicit specialization that prevents us from needing
   // 'template<>' headers, this will be set to the location of that

clang/test/CXX/temp/temp.spec/temp.expl.spec/examples.cpp

@@ -166,3 +166,13 @@ namespace PR9877 {
   template<> const int X<1>::Y::Z; // expected-error{{extraneous 'template<>' in declaration of variable 'Z'}}
 }
 
+namespace PR9913 {
+  template<class,class=int>struct S;
+  template<class X>struct S<X> {
+    template<class T> class F;
+  };
+
+  template<class A>
+  template<class B>
+  class S<A>::F{};
+}