@SafeVarargs
        @Nullable
        static <T> SideEffect<T> composite(SideEffect<? super T>... sideEffects) {
            @SuppressWarnings("varargs")
            List<SideEffect<T>> sideEffectList = Cast.uncheckedNonnullCast(Arrays.asList(sideEffects));
            return CompositeSideEffect.of(sideEffectList);
        }

        /**

        return Cast.uncheckedNonnullCast(getInstantiator().newInstance(DefaultTaskCollection.class, this, filter, getInstantiator(), project, parentMutationGuard));
    }

    @Override
    protected <S extends T> DefaultTaskCollection<S> filtered(Spec<String> nameFilter, CollectionFilter<S> elementFilter) {

            setSupplier(new FixedSupplier<>(value.getFixedValue(), Cast.uncheckedCast(value.getSideEffect())));
        } else {
            CollectingProvider<T, C> asCollectingProvider = Cast.uncheckedNonnullCast(value.getChangingValue());
            setSupplier(new CollectingSupplier(new ElementsFromCollectionProvider<>(asCollectingProvider)));
        }
    }

    @Override

            this.provider = ignoreAbsent ? neverMissing(Cast.uncheckedNonnullCast(provider)) : provider;
            this.ignoreAbsent = ignoreAbsent;
        }

        @Nonnull
        private static <T> ProviderInternal<? extends Iterable<? extends T>> neverMissing(ProviderInternal<Iterable<? extends T>> provider) {
            return Cast.uncheckedNonnullCast(provider.orElse(ImmutableList.of()));
        }

        @Override

    public Iterable<InputFileDetails> getAllFileChanges() {
        Iterable<FileChange> changes = () -> currentInputs.values().stream().flatMap(NonIncrementalInputChanges::getAllFileChanges).iterator();
        return Cast.uncheckedNonnullCast(changes);
    }

    private static Stream<FileChange> getAllFileChanges(CurrentFileCollectionFingerprint currentFileCollectionFingerprint) {

            } catch (Throwable t) {
                //failed to instantiate BlockJUnitRunner. try deprecated JUnitRunner (for JUnit < 4.5)
                try {
                    Class<Runner> runnerClass = Cast.uncheckedNonnullCast(Thread.currentThread().getContextClassLoader().loadClass("org.junit.internal.runners.JUnit4ClassRunner"));
                    final Constructor<Runner> constructor = runnerClass.getConstructor(Class.class);

            setSupplier(noValueSupplier());
        } else if (value.hasFixedValue()) {
            setSupplier(new FixedSupplier<>(uncheckedNonnullCast(value.getFixedValue()), uncheckedCast(value.getSideEffect())));
        } else {
            CollectingProvider<K, V> asCollectingProvider = uncheckedNonnullCast(value.getChangingValue());
            setSupplier(new CollectingSupplier(new EntriesFromMapProvider<>(asCollectingProvider)));
        }

        Class<? extends BuildCacheServiceFactory<C>> castFactoryType = Cast.uncheckedNonnullCast(
            buildCacheConfiguration.getBuildCacheServiceFactoryType(configuration.getClass())
        );

        BuildCacheServiceFactory<C> factory = instantiator.newInstance(castFactoryType);
        Describer describer = new Describer();
        S service = Cast.uncheckedNonnullCast(factory.createBuildCacheService(configuration, describer));

        private Failure(String reason) {
            this.reason = reason;
        }
    }

    private static final Class<? extends Annotation>[] CALLABLE_KIND_ANNOTATION_CLASSES = Cast.uncheckedNonnullCast(new Class<?>[]{
        CallableKind.InstanceMethod.class,
        CallableKind.StaticMethod.class,
        CallableKind.AfterConstructor.class,
        CallableKind.GroovyPropertyGetter.class,

    }

    public CompositeFileTree() {
        super();
    }

    @Override
    protected List<? extends FileTreeInternal> getSourceCollections() {
        return Cast.uncheckedNonnullCast(super.getSourceCollections());
    }

    @Override
    public FileTree plus(FileTree fileTree) {
        return new UnionFileTree(taskDependencyFactory, this, Cast.cast(FileTreeInternal.class, fileTree));
    }