5.6 Request 验证类无法通过？

<?php namespace Core\Asset\Requests;

use App\Http\Requests\Request;

class FixedRequest extends Request
{
    public function rules()
    {
        return [
            'uuid' => 'required|string',
            'department_uuid' => 'required|string',
            'secondment' => 'required|in:0,1,2',
            'secondment_time' => 'required|string',
            'insurance_department_uuid' => 'required|string',

        ];
    }

    public function messages()
    {
        return [
            'uuid.required' => '唯一标示必须填写',
            'department_uuid.required' =>  '使用单位uuid必须填写',
            'secondment.required' => '是否借调状态皮必须填写',
            'secondment_time.required' => '借调时间必须填写',
            'insurance_department_uuid.required' => '交保险单位必须填写',
        ];
    }
}

这种验证再5.6中不好使，你们也可以试一试，或者有知道为什么的回个话谢谢，我们两个人都测试了都不行5.5的可以，不知道是不是一个bug