+ fatal_error(f"UNRECOGNIZED OPTION LINE: {line}\n"
+ "Valid requests:\n"
+ " ! output ignore\n"
+ " ! output sort\n"
+ " ! output display\n"
+ " ! setenv XX=YY\n"
+ " ! ignore XYZ\n"
+ " ! expect return NN\n"
+ " ! expect signal NN\n"
+ " ! timeout NN\n")