test/SemaObjCXX/Inputs/arc-system-header.h - clang - Git at Google

 @interface B
 @end


 @interface A {
 @public
   union {
     struct {
       B *b;
     } a_b;
     void *void_ptr;
   } data;
 }
 @end
	@interface B
	@end


	@interface A {
	@public
	union {
	struct {
	B *b;
	} a_b;
	void *void_ptr;
	} data;
	}
	@end