Add test for anonymous struct containing an implicitly private data member.

Patch by Jacob Young!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@300266 91177308-0d34-0410-b5e6-96231b3b80d8

Author: zygoloid

test/SemaCXX/anonymous-struct.cpp

@@ -21,6 +21,9 @@ struct E {
   };
   static struct {
   };
+  class {
+    int anon_priv_field; // expected-error {{anonymous struct cannot contain a private data member}}
+  };
 };
 
 template <class T> void foo(T);