用于进行gcc测试

				// { dg-do assemble  }				// GROUPS passed visibility				class foo {				protected:				  int i; // { dg-error "" } protected				};								class bar : public foo {				public:				  friend void baz (foo *);				};								void baz (foo *f)				{				  f->i = 1;	// error: i is protected// { dg-error "" } .*				}