old_contents: import Ember from 'ember';
  
  const { computed, inject } = Ember;
  
  export default Ember.Controller.extend({
    currentAccount: inject.service(),
    loggedIn: computed.readOnly('currentAccount.loggedIn')
  });
  
new_contents: import Ember from 'ember';
  
  const { computed, inject } = Ember;
  
  /**
   * A controller for our 404 page to give us access to the current user session.
   *
   * @class CanvasWeb.NotFoundController
   * @extends Ember.Controller
   */
  export default Ember.Controller.extend({
    /**
     * @member {CanvasWeb.CurrentAccountService} A service exposing the current
     *   user account
     */
    currentAccount: inject.service(),
  
    /**
     * @member {boolean} Whether the current user is logged in
     */
    loggedIn: computed.readOnly('currentAccount.loggedIn')
  });
  
subject: Add basic documentation for not-found controller