}

    private void ensureResolved() {
        result.finalizeIfNotAlready();
    }

    private static class ArtifactSetResult {
        private final Set<ResolvedArtifactResult> artifactResults;
        private final Set<Throwable> failures;

        ArtifactSetResult(Set<ResolvedArtifactResult> artifactResults, Set<Throwable> failures) {
            this.artifactResults = artifactResults;