用于进行gcc测试

				/* Test the tester; previously part of gcc.misc-tests/dg-9.c.  */				/* { dg-prms-id 42 } */				/* { dg-options "-Wall" } */								f ()				{	/* { dg-error "return type" "warning test" } */				}	/* { dg-error "control reaches end" "warning test" } */								main (int argc, char *argv[])				{		/* { dg-error "return type" "warning test" } */				}		/* { dg-error "control reaches end" "warning test" } */