Fix cases where the optional nested-name-specifier erroneously preceeded a decltype-specification when specifying a base type.

llvm-svn: 142928
diff --git a/clang/test/CXX/class.derived/p1.cpp b/clang/test/CXX/class.derived/p1.cpp
index 98c1d35..dcbe63f 100644
--- a/clang/test/CXX/class.derived/p1.cpp
+++ b/clang/test/CXX/class.derived/p1.cpp
@@ -30,4 +30,8 @@
   struct Derived3 : decltype(T().foo()) { };
   struct Foo { Base foo(); };
   Derived3<Foo> d;
+
+  struct Derived4 : :: decltype(Base()) { }; // expected-error {{expected class name}}
+
+  struct Derived5 : PR11216:: decltype(Base()) { }; // expected-error {{expected class name}}
 }