eval.c:9805
static VALUE
rb_thread_raise_m(argc, argv, thread)
    int argc;
    VALUE *argv;
    VALUE thread;
{
    rb_thread_t th = rb_thread_check(thread);

    if (ruby_safe_level > th->safe) {
	rb_secure(4);
    }
    rb_thread_raise(argc, argv, th);
    return Qnil;		/* not reached */
}
