eval.c:163
void
rb_check_safe_obj(x)
    VALUE x;
{
    if (ruby_safe_level > 0 && OBJ_TAINTED(x)){
	if (ruby_frame->last_func) {
	    rb_raise(rb_eSecurityError, "Insecure operation - %s",
		     rb_id2name(ruby_frame->last_func));
	}
	else {
	    rb_raise(rb_eSecurityError, "Insecure operation: -r");
	}
    }
    rb_secure(4);
}
