UnboundMethod#bind_call

static VALUE
umethod_bind_call(int argc, VALUE *argv, VALUE method)
{
    rb_check_arity(argc, 1, UNLIMITED_ARGUMENTS);
    VALUE recv = argv[0];
    argc--;
    argv++;

    VALUE passed_procval = rb_block_given_p() ? rb_block_proc() : Qnil;
    rb_execution_context_t *ec = GET_EC();

    const struct METHOD *data;
    TypedData_Get_Struct(method, struct METHOD, &method_data_type, data);

    const rb_callable_method_entry_t *cme = rb_callable_method_entry(CLASS_OF(recv), data->me->called_id);
    if (data->me == (const rb_method_entry_t *)cme) {
        vm_passed_block_handler_set(ec, proc_to_block_handler(passed_procval));
        return rb_vm_call_kw(ec, recv, cme->called_id, argc, argv, cme, RB_PASS_CALLED_KEYWORDS);
    }
    else {
        VALUE methclass, klass, iclass;
        const rb_method_entry_t *me;
        convert_umethod_to_method_components(data, recv, &methclass, &klass, &iclass, &me);
        struct METHOD bound = { recv, klass, 0, methclass, me };

        return call_method_data(ec, &bound, argc, argv, passed_procval, RB_PASS_CALLED_KEYWORDS);
    }
}