modified.set(result.parent);
            }
            return result.source;
        }
    }

    static <T extends Throwable> void uncheckedThrow(Throwable t) throws T {
        throw (T) t; // rely on vacuous cast
    }

    private ModelSource doResolveModel(Parent parent, AtomicReference<Parent> modified)
            throws UnresolvableModelException {
        try {
            final Artifact artifact =