assertEquals(
        Types.subtypeOf(Object.class),
        TypeToken.of(Types.subtypeOf(Object[].class)).getComponentType().getType());
    assertEquals(
        Types.subtypeOf(Object[].class),
        Types.newArrayType(
            TypeToken.of(Types.subtypeOf(Object[].class)).getComponentType().getType()));
    assertEquals(
        int.class, TypeToken.of(Types.subtypeOf(int[].class)).getComponentType().getType());

    assertEquals(
        Types.subtypeOf(Object.class),
        TypeToken.of(Types.subtypeOf(Object[].class)).getComponentType().getType());
    assertEquals(
        Types.subtypeOf(Object[].class),
        Types.newArrayType(
            TypeToken.of(Types.subtypeOf(Object[].class)).getComponentType().getType()));
    assertEquals(
        int.class, TypeToken.of(Types.subtypeOf(int[].class)).getComponentType().getType());

    assertThrows(IllegalArgumentException.class, () -> Types.subtypeOf(int.class));
  }

  public void testNewWildcardType_serializable() {
    SerializableTester.reserializeAndAssert(Types.supertypeOf(String.class));
    SerializableTester.reserializeAndAssert(Types.subtypeOf(String.class));
    SerializableTester.reserializeAndAssert(Types.subtypeOf(Object.class));
  }

    assertThrows(IllegalArgumentException.class, () -> Types.subtypeOf(int.class));
  }

  public void testNewWildcardType_serializable() {
    SerializableTester.reserializeAndAssert(Types.supertypeOf(String.class));
    SerializableTester.reserializeAndAssert(Types.subtypeOf(String.class));
    SerializableTester.reserializeAndAssert(Types.subtypeOf(Object.class));
  }

    assertTrue(isComparable.apply(Integer.class));
    assertTrue(isComparable.apply(Float.class));
  }

  @J2ktIncompatible
  @GwtIncompatible // Predicates.subtypeOf
  public void testSubtypeOf_equality() {
    new EqualsTester()
        .addEqualityGroup(Predicates.subtypeOf(Integer.class))
        .addEqualityGroup(Predicates.subtypeOf(Number.class))

      } else {
        Type[] upperBounds = wildcard.getUpperBounds();
        checkArgument(upperBounds.length == 1, "Wildcard should have only one upper bound.");
        return subtypeOf(newArrayType(upperBounds[0]));
      }
    }
    return JavaVersion.CURRENT.newArrayType(componentType);
  }

  /**
   * Returns a type where {@code rawType} is parameterized by {@code arguments} and is owned by

    new BaseTypeVisitor() {
      @Override
      void visitTypeVariable(TypeVariable<?> t) {}
    }.visit(type);
  }

  public void testVisitWildcardType() {
    WildcardType type = Types.subtypeOf(String.class);
    assertVisited(type);
    new BaseTypeVisitor() {
      @Override
      void visitWildcardType(WildcardType t) {}
    }.visit(type);
  }

  public <T> void testVisitGenericArrayType() {

    Type subtype = new TypeCapture<TypedKeyMap<T>>() {}.capture();
    assertEquals(
        new TypeCapture<TypedKeyMap<String>>() {}.capture(),
        new TypeResolver()
            .where(
                new TypeCapture<Map<Integer, T>>() {}.capture(),
                new TypeCapture<Map<?, String>>() {}.capture())
            .resolveType(subtype));
  }

    Type subtype = new TypeCapture<TypedKeyMap<T>>() {}.capture();
    assertEquals(
        new TypeCapture<TypedKeyMap<String>>() {}.capture(),
        new TypeResolver()
            .where(
                new TypeCapture<Map<Integer, T>>() {}.capture(),
                new TypeCapture<Map<?, String>>() {}.capture())
            .resolveType(subtype));
  }

        _ * classDoc.classBlocks >> []
        _ * classDoc.classExtensions >> []
        def subtypes = [ "org.gradle.Subtype1", "org.gradle.Subtype2", "org.gradle.Subtype3", "org.gradle.Subtype4" ].collect {
            ClassDoc subtype = Mock()
            _ * subtype.name >> it
            subtype
        }
        _ * classDoc.subClasses >> subtypes

        when:
        def result = parse('<root/>')
        withCategories {