private final ImmutableSortedSet.Builder<ServiceReferenceSpec> serviceReferences = ImmutableSortedSet.naturalOrder();

    public ImmutableSortedSet<ServiceReferenceSpec> getServiceReferences() {
        return serviceReferences.build();
    }

    @Override

     * It is guaranteed that all the {@link ServiceReferenceSpec}s have a name and that the names are unique.
     *
     * @see org.gradle.api.services.ServiceReference
     */
    ImmutableSortedSet<ServiceReferenceSpec> getServiceReferences();

    /**
     * Whether output properties have been declared.
     */
    boolean hasDeclaredOutputs();

    /**
     * The files that represent the local state.
     */

            inputPropertiesVisitor.getProperties(),
            inputFilesVisitor.getFileProperties(),
            outputFilesCollector.getFileProperties(),
            serviceReferencesVisitor.getServiceReferences(),
            outputUnpacker.hasDeclaredOutputs(),
            localStateVisitor.getFiles(),
            destroyablesVisitor.getFiles(),
            validationVisitor.getTaskPropertySpecs(),

        // this goes through task to benefit from services a task has available
        task.acceptServiceReferences(collector.getServiceReferences());
    }

    @Override
    public boolean isServiceRequired(Provider<? extends BuildService<?>> toCheck) {
        return getElements(false).stream().anyMatch(it -> BuildServiceProvider.isSameService(toCheck, it));

            // piggyback on mutation resolution to declare service references as used services
            task.acceptServiceReferences(taskProperties.getServiceReferences());
        } catch (Exception e) {
            throw new TaskExecutionException(task, e);
        }

        if (!mutations.destroyablePaths.isEmpty()) {
            if (mutations.hasOutputs) {