if strict {
				// Cases #6 and #8: contradiction
				return false
			}

			// We're in case #5 or #7. Try to collapse path, and that will
			// fail if it realizes that we are in case #7.
			return po.collapsepath(n2, n1)
		}

		// We don't know of any existing relation between n1 and n2. They could
		// be part of the same DAG or not.

        @Override
        public void collectInto(ImmutableCollection.Builder<T> builder) {
            if (!realized) {
                realize();
            }
            builder.addAll(cache);
        }

        List<T> getValues() {
            if (!realized) {
                realize();
            }
            return cache;
        }

        public boolean remove(T value) {

        container.bean {
            assert it == b
        }
    }

    def "name based filtering does not realize pending"() {
        given:
        container.add(new Bean("realized1"))
        container.addLater(new TestNamedProvider("unrealized1", new Bean("unrealized1")))
        container.add(new Bean("realized2"))
        container.addLater(new TestNamedProvider("unrealized2", new Bean("unrealized2")))

            // Collect elements discarding potential side effects aggregated in the returned value
            collector.collectInto(builder);
            List<T> realized = builder.build();
            for (T element : realized) {
                doAddRealized(element);
            }
        }
    }

    private void doAddRealized(T value) {
        if (values.add(value) && addRealizedAction != null) {

        verifyTaskIds()
        verifyTaskDetails(RegisterTaskBuildOperationType, withPath(':', ':foo')).children.empty
        def realize = verifyTaskDetails(RealizeTaskBuildOperationType, withPath(':', ':foo'))
        realize.children.empty
        realize.details.eager == false
    }

    def "op during realize are child ops"() {
        given:
        register('foo')
        register('bar')
        buildFile << """

        expect:
        list.findAll { it != "b" } == ["a", "c"]
    }

    def "name based filtering does not realize pending"() {
        given:
        list.add("realized1")
        list.addLater(new TestNamedProvider("unrealized1", "unrealized1"))
        list.add("realized2")
        list.addLater(new TestNamedProvider("unrealized2", "unrealized2"))

        expect: "unrealized elements remain as such"

        // Realize all object of type `type`
        def element = container.withType(type).iterator().next()

        when:
        def didRemoved = container.remove(element)

        then:
        didRemoved

        and:
        0 * _
    }

    def "will execute remove action when removing external provider only for realized elements"() {

    }

    void realize() {
        registry.realizeNode(path)
    }

    void selfClose() {
        registry.atState(path, ModelNode.State.SelfClosed)
    }

    ModelMap<T> realizeAsModelMap() {
        registry.realize(path, modelMapType)
    }

    T realizeChild(String name) {
        registry.realize(path.child(name), itemType)
    }

            implementation("com:foo")
        }
    }
}

configurations.testImplementation {
    // Calling `all` here realizes/observes all lazy sources, including the `DependencyCollector`
    // from the test suite block. Operations like resolving a configuration similarly realize lazy sources.
    dependencies.all {
        if (this is ExternalDependency && group == "com" && name == "foo" && version == null) {

        return buildHierarchy(project.getRootProject(), realizeTasks);
    }

    /**
     * When {@code realizeTasks} is false, the project's task graph will not be realized, and the task list in the model will be empty
     */
    private static DefaultGradleProject buildHierarchy(Project project, boolean realizeTasks) {