if (!lenient) {
            resolutionHost.rethrowFailure("files", collectingVisitor.getFailures());
        }
    }

    @Override
    protected void appendContents(TreeFormatter formatter) {
        formatter.node("contains: " + getDisplayName());
    }

    SelectedArtifactSet getSelectedArtifacts() {
        if (selectedArtifacts == null) {

        super(taskDependencyFactory, patternSetFactory);
        this.collection = collection;
    }

    @Override
    protected void appendContents(TreeFormatter formatter) {
        formatter.node("backing collection");
        formatter.startChildren();
        collection.describeContents(formatter);
        formatter.endChildren();
    }