public boolean hasDeclaredOutputs() {
            return hasDeclaredOutputs;
        }
    }

    private class TaskOutputUnionFileCollection extends CompositeFileCollection implements Describable {
        private final TaskInternal buildDependencies;

        public TaskOutputUnionFileCollection(TaskDependencyFactory taskDependencyFactory, TaskInternal buildDependencies) {
            super(taskDependencyFactory);