int foo(){	char c; 	return (c ^ 30  ) > (c ^ 40 );/*  these also get the signal : 	return (c ^ 30  ) == (c ^ 40 ); 	return ((int)c ^ 30  ) > (c ^ 40 );  also fails if c is "extern char"  these are ok : 	return (c + 30  ) > (c ^ 40 ); 	return (c ^ 30  ) > (c + 40 ); 	return (c ^ 30  ) + (c ^ 40 ); 	return ('a' ^ 30  ) > (c ^ 40 ); 	return (c ^ 40 ); 	return (c ^ 30  ) > (c ^ 40 );*/}