OpenBSD-4.6/regress/usr.bin/bc/t4.in

while (0) while(1) while(2) while(3) while(4) while(5) while(6) while(7) {
	while (8) while (9) while (10) while (11) while(12) while(13) {
		while(14) while(15) {
		}
	}
}