throw new IllegalArgumentException(String.format("Cannot set the %s of a property of type %s with key type %s and value type %s " +
                        "using a provider with key type %s and value type %s.", valueKind, Map.class.getName(), keyType.getName(), valueType.getName(),
                    providerKeyType.getName(), providerValueType.getName()));
            }

    @Override
    public FileTree visit(Closure closure) {
        return visit(fileVisitorFrom(closure));
    }

    static FileVisitor fileVisitorFrom(Closure closure) {
        return DefaultGroovyMethods.asType(closure, FileVisitor.class);
    }

    @Override
    public FileTree visit(final Action<? super FileVisitDetails> visitor) {
        return visit(new FileVisitor() {
            @Override

        for (Provider<R> provider : items) {
            Value<? extends R> value = Providers.internal(provider).calculateValue(consumer);
            if (value.isMissing()) {
                return value.asType();
            }
            values.add(value);
        }

        ImmutableList.Builder<R> result = ImmutableList.builderWithExpectedSize(values.size());
        for (Value<? extends R> value : values) {

    protected final Class<OUT> type;
    protected final ProviderInternal<? extends IN> provider;
    protected final Transformer<? extends OUT, ? super IN> transformer;

    public TransformBackedProvider(
        @Nullable Class<OUT> type,
        ProviderInternal<? extends IN> provider,
        Transformer<? extends OUT, ? super IN> transformer
    ) {
        this.type = type;
        this.transformer = transformer;

        1 * source2.visit(visitor)
    }

    def visitsEachTreeWithClosure() {
        final Closure visitor = TestUtil.TEST_CLOSURE
        final FileVisitor closureAsVisitor = DefaultGroovyMethods.asType(visitor, FileVisitor.class)

        when:
        tree.visit(visitor)

        then:
        1 * source1.visit(closureAsVisitor)
        1 * source2.visit(closureAsVisitor)
    }

        private final Class<? extends T> type;
        protected final Collector<T> delegate;
        private final ValueCollector<T> valueCollector;

        public TypedCollector(@Nullable Class<? extends T> type, Collector<T> delegate) {
            this.type = type;
            this.delegate = delegate;
            this.valueCollector = ValueSanitizers.collectorFor(type);
        }

        @Nullable

 *   jaxDoclet
 * }
 *
 * dependencies {
 *   //jaxDoclet "some.interesting:Dependency:1.0"
 * }
 *
 * task generateRestApiDocs(type: Javadoc) {
 *   source = sourceSets.main.allJava
 *   destinationDir = reporting.file("rest-api-docs")
 *   options.docletpath = configurations.jaxDoclet.files.asType(List)
 *   options.doclet = "com.lunatech.doclets.jax.jaxrs.JAXRSDoclet"

                throw new IllegalArgumentException(String.format("Cannot set the value of a property of type %s with element type %s using a provider with element type %s.", collectionType.getName(), elementType.getName(), collectionProp.getElementType().getName()));
            }
        }
        setSupplier(new CollectingSupplier(new ElementsFromCollectionProvider<>(p)));
    }

         * CRC32C to Checksum. This may carry some performance cost
         * (https://stackoverflow.com/a/22321671/28465), but I'd have to benchmark more carefully to
         * even detect it.
         */
        return MethodHandles.lookup()
            .findConstructor(clazz, methodType(void.class))
            .asType(methodType(Checksum.class));

Working with files::
 * You can no longer cast `FileCollection` objects to other types using the `as` keyword or the `asType()` method.
 * You can no longer pass `null` as the configuration action of link:{javadocPath}/org/gradle/api/file/CopySpec.html#from-java.lang.Object-org.gradle.api.Action-[CopySpec.from(Object, Action)].