How do I bind this type in Guava?
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I have this field:

	@Inject(optional=true)
	@Named(NAMED_ERROR_HANDLER)
	private PolymorphicDispatcher.ErrorHandler<IScope> errorHandler = new PolymorphicDispatcher.NullErrorHandler<IScope>();

and I need to override the default binding (`NullErrorHandler`). How do I do that?