用于进行gcc测试

				/* Check if casting the receiver type causes method lookup to succeed.  This was broken				   in Objective-C++.  */				/* Contributed by Ziemowit Laski   */				/* { dg-do compile } */								@interface A				@end								@interface B: A				- (void)f;				@end								void g(A *p) { [(B *)p f];  }