confirmEmail 函数的 $token,根据路由，不是应该通过 $request->token 吗，这里怎么是写到参数里了？

public function confirmEmail($token)
    {
        $user = User::where('activation_token', $token)->firstOrFail();

        $user->activated = true;
        $user->activation_token = null;
        $user->save();

        Auth::login($user);
        session()->flash('success', '恭喜你，激活成功！');
        return redirect()->route('users.show', [$user]);
    }