title: How to find which components are conflicting?
body: <p>I'm using ES5 flavor of Angular 2. 
  And I've encountered this error:</p>
  
  <pre><code>Unhandled Promise rejection: Template parse errors:
  More than one component matched on this element.
  Make sure that only one component's selector can match a given element.
  Conflicting components: class2,class6 ("
      &lt;/tbody&gt;
  &lt;/table&gt;
  [ERROR -&gt;]&lt;paging [data]="data" (changed)="loadCountries($event)" unit="country"&gt;&lt;/paging&gt;
  &lt;md-spinner class="lis"): class18@30:0 ; Zone: &lt;root&gt; ; Task: Promise.then ; Value: 
  </code></pre>
  
  <p>It says <code>class2</code> and <code>class6</code>. I can't find out the original names of the classes.</p>
  
  <p>Here's my module definition:</p>
  
  <pre><code>var module = ng.core.NgModule({
      imports: [
          ng.platformBrowser.BrowserModule, 
          ng.router.RouterModule.forRoot([].concat([...])), 
          ng.material.MaterialModule, 
          ng.http.HttpModule, 
          ng.common.CommonModule, 
          ng.forms.FormsModule],
      declarations: [
          app.CoalAddWorldCoalSupply, 
          app.FilterValuesDialog, 
          app.CoalFlows, 
          app.ImportWorldCoalSupplies, 
          app.CoalProducts, 
          app.CoalReports, 
          app.CoalUpsertFlow, 
          app.CoalUpsertProduct, 
          app.CoalWorldCoalSupplies, 
          app.CountryList, 
          app.CountryUpsert, 
          app.Dashboard, 
          app.ElectricityHeatGenerations, 
          ...
          ],
      entryComponents: [app.FilterValuesDialog, confirmDialog],
      bootstrap: [app.Layout],
      providers: [globalService]
  })
  .Class({
      constructor: function () { }
  });
  
  document.addEventListener('DOMContentLoaded', function () {
      ng.platformBrowserDynamic
        .platformBrowserDynamic()
        .bootstrapModule(module);
  });
  </code></pre>
  
  <p>Parts specified with <code>...</code> means more of the same things.</p>
  
  <p>How to understand which class <code>zone.js</code> is referring to?</p>