[c++2a] Implement semantic restrictions for 'export' declarations.

llvm-svn: 358932
diff --git a/clang/test/SemaCXX/anonymous-union-export.cpp b/clang/test/SemaCXX/anonymous-union-export.cpp
index 1d83d80..689c6b9 100644
--- a/clang/test/SemaCXX/anonymous-union-export.cpp
+++ b/clang/test/SemaCXX/anonymous-union-export.cpp
@@ -1,6 +1,7 @@
 // RUN: %clang_cc1 -std=c++17 -fmodules-ts -emit-obj -verify -o %t.pcm %s
 
 export module M;
-export {
-    union { bool a; }; // expected-error{{anonymous unions at namespace or global scope must be declared 'static'}}
+export { // expected-note 2{{export block begins here}}
+    union { bool a; }; // expected-error {{anonymous unions at namespace or global scope must be declared 'static'}} expected-error {{declaration of 'a' with internal linkage cannot be exported}}
+    static union { bool a; }; // expected-error {{declaration of 'a' with internal linkage cannot be exported}}
 }