When searching for an instantiated declaration requires instantiation

of its parent context, be sure to update the parent-context pointer
after instantiation. Fixes two anonymous-union instantiation issues in
<rdar://problem/8635664>.

llvm-svn: 118313

clang/lib/Sema/SemaTemplateInstantiateDecl.cpp

@@ -2753,6 +2753,8 @@ NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
         if (!Tag->isBeingDefined() &&
             RequireCompleteType(Loc, T, diag::err_incomplete_type))
           return 0;
+
+        ParentDC = Tag->getDecl();
       }
     }
 

clang/test/SemaTemplate/anonymous-union.cpp

@@ -17,3 +17,24 @@ struct T1 : public T0, public T {
 struct A : public T0 { };
 
 void f1(T1<A> *S) { S->f0(); } // expected-note{{instantiation of member function}}
+
+namespace rdar8635664 {
+  template<typename T>
+  struct X {
+    struct inner;
+  
+    struct inner {
+      union {
+        int x;
+        float y;
+      };
+
+      typedef T type;
+    };
+  };
+
+  void test() {
+    X<int>::inner i;
+    i.x = 0;
+  }
+}