Having trouble rebinding $request->setUserResolver

I'm attempting to rebind what $request->user() returns, and having poked through the built in authentication code, I found a service using app->rebinding to request->setUserResolver is how it's done? I tried it myself, with no luck, and hoping I can get help? I created a service (well, coopted AuthServiceProvider, and changed the register to:

public function register()
{
    $this->app->rebinding('request', function ($app, $request) {
        $request->setUserResolver(function () use ($app) {
            $token = $this->request->bearerToken();
            dd($token);
            // error_log($token);
            return array('user' => 1);
        });
    });
}

Ignoring the dd, which is there to test, can someone help me understanding where I'm going wrong? I even found a SO answer that seems to indicate this is the way to go but nothing gets dumped, nothing gets logged (when error log isn't commented out) and dumping $request->user() in my controller just returns null.

I know I can use the built in auth/guard setup, but I figured since I'm not using most of what the auth/guard setup has, why not try to learn and set it up myself? Of course, so far I've gotten nowhere. I'm going to fall back to using the built-in stuff, but I'd like to learn and improve.

via Chebli Mohamed