Clean up some error messages with anonymous structs/unions and member declaration parsing. Fixes PR3680

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66305 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/anonymous-struct-union.c b/test/Sema/anonymous-struct-union.c
index d8a445c..9784236 100644
--- a/test/Sema/anonymous-struct-union.c
+++ b/test/Sema/anonymous-struct-union.c
@@ -88,4 +88,11 @@
   };
 };
 
+// PR3680
 struct {}; // expected-error{{declaration does not declare anything}}
+
+struct s2 {
+  union {
+    int a;
+  }
+}; // expected-error{{expected member name or ';' after declaration specifiers}}