return superToken;
  }

  private @Nullable TypeToken<? super T> boundAsSuperclass(Type bound) {
    TypeToken<?> token = of(bound);
    if (token.getRawType().isInterface()) {
      return null;
    }
    @SuppressWarnings("unchecked") // only upper bound of T is passed in.
    TypeToken<? super T> superclass = (TypeToken<? super T>) token;
    return superclass;
  }

      @SuppressWarnings("unchecked") // returns default for both F and T
      T defaultConverter = (T) defaultConverter(convertFromType, convertToType);
      return defaultConverter;
    }
    if (type.getRawType().isInterface()) {
      return newDefaultReturningProxy(type);
    }
    return null;
  }

  private <F, T> Converter<F, T> defaultConverter(
      TypeToken<F> convertFromType, TypeToken<T> convertToType) {

      @SuppressWarnings("unchecked") // returns default for both F and T
      T defaultConverter = (T) defaultConverter(convertFromType, convertToType);
      return defaultConverter;
    }
    if (type.getRawType().isInterface()) {
      return newDefaultReturningProxy(type);
    }
    return null;
  }

  private <F, T> Converter<F, T> defaultConverter(
      TypeToken<F> convertFromType, TypeToken<T> convertToType) {

    void testPublicInterfaceAndPackage() {
        // Arrange & Act
        Class<SessionSetupHandler> clazz = SessionSetupHandler.class;

        // Assert
        assertTrue(clazz.isInterface(), "Should be an interface");
        assertTrue(Modifier.isPublic(clazz.getModifiers()), "Interface should be public");
        assertEquals("jcifs.smb", clazz.getPackageName(), "Package must match source");

        // ## Arrange ##
        String appWebPkg = ".app.web.";
        String actionSuffix = "Action";

        // ## Act ##
        policeStoryOfJavaClassChase((srcFile, clazz) -> {
            if (clazz.isInterface() || Modifier.isAbstract(clazz.getModifiers())) { // e.g. BaseAction
                return;
            }
            final String className = clazz.getName();

    }

    @Test
    @DisplayName("Interface structure is as expected")
    void interfaceStructure() {
        Class<?> c = SpnegoConstants.class;
        assertTrue(c.isInterface(), "SpnegoConstants must be an interface");
        assertEquals(4, c.getDeclaredFields().length, "Unexpected number of fields");
        assertEquals(0, c.getDeclaredMethods().length, "No declared methods expected");

            // Then
            assertTrue(Modifier.isPublic(modifiers));
            assertFalse(Modifier.isAbstract(modifiers));
            assertFalse(Modifier.isInterface(modifiers));
        }
    }

            // Then
            assertTrue(Modifier.isPublic(modifiers));
            assertFalse(Modifier.isAbstract(modifiers));
            assertFalse(Modifier.isInterface(modifiers));
        }
    }

    void typeAndSignatures() throws Exception {
        Class<?> clazz = SmbResourceLocatorInternal.class;

        // Assert it's an interface and extends the right superinterface
        assertTrue(clazz.isInterface(), "Should be an interface");
        assertTrue(Arrays.asList(clazz.getInterfaces()).contains(SmbResourceLocator.class), "Should extend SmbResourceLocator");

   *     interface
   */
  public static <T> T newProxy(Class<T> interfaceType, InvocationHandler handler) {
    checkNotNull(handler);
    checkArgument(interfaceType.isInterface(), "%s is not an interface", interfaceType);
    Object object =
        Proxy.newProxyInstance(
            interfaceType.getClassLoader(), new Class<?>[] {interfaceType}, handler);
    return interfaceType.cast(object);