Check that the alias points to a valid namespace.

llvm-svn: 67925
diff --git a/clang/test/SemaCXX/namespace-alias.cpp b/clang/test/SemaCXX/namespace-alias.cpp
index 7458930..7d46d08 100644
--- a/clang/test/SemaCXX/namespace-alias.cpp
+++ b/clang/test/SemaCXX/namespace-alias.cpp
@@ -9,3 +9,8 @@
 
 namespace C { } // expected-note {{previous definition is here}}
 namespace C = N; // expected-error {{redefinition of 'C'}}
+
+int i;
+namespace D = i; // expected-error {{expected namespace name}}
+
+namespace E = N::Foo; // expected-error {{expected namespace name}}