autoload?

/*
 *  call-seq:
 *     autoload(module, filename)   => nil
 *
 *  Registers _filename_ to be loaded (using <code>Kernel::require</code>)
 *  the first time that _module_ (which may be a <code>String</code> or
 *  a symbol) is accessed.
 *
 *     autoload(:MyModule, "/usr/local/lib/modules/my_module.rb")
 */

static VALUE
rb_f_autoload_p(obj, sym)
    VALUE obj;
    VALUE sym;
{
    /* use ruby_cbase as same as rb_f_autoload. */
    if (NIL_P(ruby_cbase)) {
        return Qfalse;
    }
    return rb_mod_autoload_p(ruby_cbase, sym);
}