界面在Laravel 4中不起作用

I'm trying to implement Laravel Auth Token (https://github.com/tappleby/laravel-auth-token) and so far it's installed ok, but when I try to POST a username/password to it, it fails. I've traced the issue down to this:

Argument 1 passed to Illuminate\Auth\EloquentUserProvider::validateCredentials() must be an instance of Illuminate\Auth\UserInterface, instance of User given

Basically the code runs:

$user = $this->users->retrieveByCredentials($credentials);

.. to retrieve a user (which works: It returns a User model). It then runs:

$this->users->validateCredentials($user, $credentials)

That's where the crash happens. I checked my User model and at the top is:

use Illuminate\Auth\UserInterface;
use Illuminate\Auth\Reminders\RemindableInterface;

class User extends Eloquent {
 ...
}

I would think this makes my User model an instance of UserInterface, right?

Is there any way to check what instances my User can represent, and/or debug why the UserInterface isn't applying?

No, what would make your User class an instance of Illuminate\Auth\UserInterface would be if it actually implemented the interface. You should have something like this:

use Illuminate\Auth\UserInterface;
use Illuminate\Auth\Reminders\RemindableInterface;

class User extends Eloquent implements UserInterface {
    ...
}