buffer_strcat(exp->error_msg, "[ $now = ");
print_parsed_as_constant(exp->error_msg, n);
buffer_strcat(exp->error_msg, " ] ");
buffer_strcat(exp->error_msg, "[ $now = ");
print_parsed_as_constant(exp->error_msg, n);
buffer_strcat(exp->error_msg, " ] ");