anchor.diff:  ''')
   class AppComponent {
     Iterable<Movie> movies = [];
  +  Iterable<String> users = [];
   
     fetchMovies(List<String> users) {
       var client = new TraktWebService();
  
positive.code: 
      driver(client, users, process);
    }
  }
  
negative.code:     <div class="mdl-grid">
        <div class="mdl-cell mdl-cell--3-col">
          <div class="mdl-textfield mdl-js-textfield">
            <input class="mdl-textfield__input" type="text" #username id="username">
            <label class="mdl-textfield__label" for="username">Trakt.tv username</label>
          </div>
          <button
                class="mdl-button mdl-js-button mdl-button--raised mdl-js-ripple-effect"
                (click)="addUser(username)">
              Find movies
          </button>
          <ul class="mdl-list">
            <li *ngFor="#user of users" class="mdl-list__item">
              <span class="mdl-list__item-primary-content">
              {{ user }}
              </span>
            </li>
          </ul>
        </div>
        <div class="mdl-cell mdl-cell--3-col">
          <ol>
            <li *ngFor="#movie of movies">
              {{ movie }}
  