DB.Migrator().AutoMigrate(&Preload{}, &Join{}, &Nested{}, &Value{})

	value1 := Value{
		Name: "value",
		Nested: Nested{
			Preloads: []*Preload{
				{Value: "p1"}, {Value: "p2"},
			},
			Join: Join{Value: "j1"},
		},
	}
	value2 := Value{
		Name: "value2",
		Nested: Nested{
			Preloads: []*Preload{
				{Value: "p3"}, {Value: "p4"}, {Value: "p5"},
			},

    checkNotNull(value2);
    checkArgument(!Objects.equal(value1, value2), "Duplicate value provided.");
    distinctValues.replaceValues(type, ImmutableList.of(value1, value2));
    setDefault(type, value1);
    return this;
  }

  /**
   * Tests that {@code cls} properly checks null on all constructor and method parameters that
   * aren't annotated nullable (according to the rules of {@link NullPointerTester}). In details:
   *

    checkNotNull(value2);
    checkArgument(!Objects.equal(value1, value2), "Duplicate value provided.");
    distinctValues.replaceValues(type, ImmutableList.of(value1, value2));
    setDefault(type, value1);
    return this;
  }

  /**
   * Tests that {@code cls} properly checks null on all constructor and method parameters that
   * aren't annotated nullable (according to the rules of {@link NullPointerTester}). In details:
   *

  /**
   * Sets two distinct values for {@code type}. These values can be used for both null pointer
   * testing and equals testing.
   *
   * @since 17.0
   */
  protected final <T> void setDistinctValues(Class<T> type, T value1, T value2) {
    tester.setDistinctValues(type, value1, value2);
  }

  /** Specifies that classes that satisfy the given predicate aren't tested for sanity. */

  /**
   * Sets two distinct values for {@code type}. These values can be used for both null pointer
   * testing and equals testing.
   *
   * @since 17.0
   */
  protected final <T> void setDistinctValues(Class<T> type, T value1, T value2) {
    tester.setDistinctValues(type, value1, value2);
  }

  /** Specifies that classes that satisfy the given predicate aren't tested for sanity. */

			accessKey:          creds.AccessKey,
			secretKey:          creds.SecretKey,
			body:               []byte(`<LifecycleConfiguration><Rule><ID>id</ID><Filter><Prefix>logs/</Prefix><Tag><Key>Key1</Key><Value>Value1</Value></Tag></Filter><Status>Enabled</Status><Expiration><Days>365</Days></Expiration></Rule></LifecycleConfiguration>`),
			expectedRespStatus: http.StatusBadRequest,
			lifecycleResponse:  []byte(``),

	// In background, update the store.
	go func() {
		store.Add(makeTestPodDetails("pod1", 2, "node1", map[string]string{"label": "value1"}))
		store.Add(makeTestPodDetails("pod2", 3, "node1", map[string]string{"label": "value1"}))
		store.Add(makeTestPodDetails("pod3", 5, "node2", map[string]string{"label": "value2"}))
	}()

	// list by empty MatchValues.
	list, resourceVersion, indexUsed, err := store.WaitUntilFreshAndList(ctx, 5, nil)

                return parameters.value.orNull
            }
        }

        def vsResult = providers.of(IdentitySource) {
            parameters.value = providers.systemProperty("property")
        }

        System.setProperty("property", "someValue")

        println("configuration value = \${vsResult.getOrElse("NO VALUE")}")

        tasks.register("echo") {
            doLast {

// Builtins are not considered values. Constant values have a non-
// nil Value.
func (tv TypeAndValue) IsValue() bool {
	switch tv.mode {
	case constant_, variable, mapindex, value, nilvalue, commaok, commaerr:
		return true
	}
	return false
}

// IsNil reports whether the corresponding expression denotes the
// predeclared value nil. Depending on context, it may have been