public class RosettaResourceSet extends XtextResourceSet {
	@Inject
	public RosettaResourceSet(RosettaBuiltinsService builtinsService) {
		getResources().add(builtinsService.getBasicTypesResource());
		getResources().add(builtinsService.getAnnotationsResource());
	}
}

	override Class<? extends ResourceSet> bindResourceSet() {
		RosettaResourceSet
	}
	
	override Class<? extends XtextResourceSet> bindXtextResourceSet() {
		SynchronizedRosettaResourceSet
	}

com.google.inject.ProvisionException: Unable to provision, see the following errors:

1) [Guice/CanNotProxyClass]: Tried proxying XtextResourceSet to support a circular dependency, but it is not an interface.
  while locating SynchronizedRosettaResourceSet
  while locating XtextResourceSet
  at TerminalsGrammarAccess.<init>(TerminalsGrammarAccess.java:36)
  at TerminalsGrammarAccess.class(TerminalsGrammarAccess.java:36)
  at RosettaGrammarAccess.<init>(RosettaGrammarAccess.java:9045)
      \_ for 2nd parameter
  at RosettaGrammarAccess.class(RosettaGrammarAccess.java:9045)
  while locating RosettaGrammarAccess
  at LazyLinker.grammarAccess(LazyLinker.java:300)
      \_ for field grammarAccess
  while locating LazyLinker
  at XtextResource.linker(XtextResource.java:474)
      \_ for field linker
  while locating DerivedStateAwareResource
  while locating XtextResource
  at SynchronizedRosettaResourceSet.<init>(SynchronizedRosettaResourceSet.java:11)
  while locating SynchronizedRosettaResourceSet
  while locating XtextResourceSet

public class RosettaResourceDescriptions extends ResourceSetBasedResourceDescriptions {
	private final Map<URI, IResourceDescription> standardLibrary;
		
	@Inject
	public RosettaResourceDescriptions(
			RosettaBuiltinsService builtinsService,
			IResourceDescription.Manager manager) {
		this.standardLibrary = Map.of(
			builtinsService.basicTypesURI, manager.getResourceDescription(builtinsService.getBasicTypesResource()),
			builtinsService.annotationsURI, manager.getResourceDescription(builtinsService.getAnnotationsResource())
		);
	}
	
	@Override
	public Iterable<IResourceDescription> getAllResourceDescriptions() {
		return Iterables.concat(
				super.getAllResourceDescriptions(),
				standardLibrary.values());
	}
	
	@Override
	public boolean isEmpty() {
		return false;
	}
	
	@Override
	public IResourceDescription getResourceDescription(URI uri) {
		IResourceDescription descr = super.getResourceDescription(uri);
		if (descr != null) {
			return descr;
		}
		return standardLibrary.get(uri);
	}
}

	public Class<? extends ResourceSet> bindResourceSet() {
		return XtextResourceSet.class;
	}
	
	public Class<? extends XtextResourceSet> bindXtextResourceSet() {
		return SynchronizedXtextResourceSet.class;
	}