GWT 2.8 compile fails; 2.7 works

In our app, we have a UiBinder widget (SomeViewImpl) which has, as its root element, a widget which itself is a UiBinder widget (CollectionManagementLayout).

My UiBinder declaration in SomeViewImpl looks like this:

interface CollectionManagementPanelUiBinder extends UiBinder<CollectionManagementLayout, SomeViewImpl> {}

The UiBinder XML for the SomeViewImpl class starts off like this:

  <collectionmanagement:CollectionManagementLayout ui:field="layout">

    . . . 
  </collectionmanagement:CollectionManagementLayout>

This code compiles just fine in GWT 2.7, but with 2.8, I get the following error:

[ERROR] Errors in 'generated://09CDEAB17C92C8C75AB00C9F2F0DF847/com/myco/myproduct/client/stuff/collections/SomeViewImpl_CollectionManagementPanelUiBinderImpl.java'

      [ERROR] Line 17: The interface UiBinder cannot be implemented more than once with different arguments: UiBinder<CollectionManagementLayout,SomeViewImpl> and UiBinder<CollectionManagementLayout,SomeViewImpl>

      See snapshot: /tmp/com.myco.myproduct.client.stuff.collections.SomeViewImpl_CollectionManagementPanelUiBinderImpl3472216513944602205.java

   Tracing compile failure path for type 'com.myco.myproduct.client.stuff.collections.SomeViewImpl_CollectionManagementPanelUiBinderImpl'

      [ERROR] Errors in 'generated://09CDEAB17C92C8C75AB00C9F2F0DF847/com/myco/myproduct/client/stuff/collections/SomeViewImpl_CollectionManagementPanelUiBinderImpl.java'

         [ERROR] Line 17: The interface UiBinder cannot be implemented more than once with different arguments: UiBinder<CollectionManagementLayout,SomeViewImpl> and UiBinder<CollectionManagementLayout,SomeViewImpl>

The generated code looks like this:

public class SomeViewImpl_CollectionManagementPanelUiBinderImpl 

  implements UiBinder<CollectionManagementLayout, SomeViewImpl>, 

  SomeViewImpl.CollectionManagementPanelUiBinder {

I worked around this by changing the UiBinder declaration in SomeViewImpl to be:

interface CollectionManagementPanelUiBinder extends UiBinder<Widget, SomeViewImpl> {}

My question is: Should this have failed in GWT 2.7? Or is there a bug in GWT 2.8?

thanks,

jay

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