title: Angular 2: Inject Service to another service. (No provider error)
body: <p>I want to inject a service to another service:</p>
  
  <pre><code>@Injectable()
  
  export class Dispatcher {
  }
  
  
  @Injectable()
  
  export class TodoStore {
  
      constructor(@Inject(Dispatcher) dispatcher:Dispatcher){ 
  
      }
  }
  </code></pre>
  
  <p>But I always get Error:  No provider for Dispatcher!</p>
  
  <p>Thanks.</p>