Validator::make () 把 rule 提取出来不能使用 Rule::in () 的问题？

use Illuminate\Support\Facades\Validator;
use Illuminate\Validation\Rule;

class CategoryValidate extends BaseValidate
{
    protected $rule = [
        'name'   => 'required|max:20|unique:category',
        'status' => ['required', Rule::in(['-1', '1'])],
    ];
    protected $message = [
        'name.required'   => '名称不能为空',
        'name.unique'     => '名称已存在',
        'name.max'        => '名称最多20个字符',
        'status.required' => '状态值不能为空',
        'status.in'       => '状态值不正确'
    ];

    protected function check()
    {
        $this->validator = Validator::make($this->request->all(), $this->rule, $this->message);
    }
}

当我吧rule提取出来的时候Rule这个类不能用，报错信息：

Constant expression contains invalid operations

如果使用Rule这种规则只能写到make方法里是吗？