new Function<AnEnum, AnEnum>() {
              boolean used = false;

              @Override
              public AnEnum apply(AnEnum ae) {
                checkState(!used, "should not be applied more than once");
                used = true;
                return ae;
              }
            });
    ImmutableMap<AnEnum, AnEnum> copy = Maps.immutableEnumMap(map);

            new Function<AnEnum, AnEnum>() {
              boolean used = false;

              @Override
              public AnEnum apply(AnEnum ae) {
                checkState(!used, "should not be applied more than once");
                used = true;
                return ae;
              }
            });
    ImmutableMap<AnEnum, AnEnum> copy = Maps.immutableEnumMap(map);

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      }
    }
  }

  @GwtIncompatible // TODO
  public void testIntModZeroModulusFails() {
    for (long x : ALL_LONG_CANDIDATES) {
      try {
        LongMath.mod(x, 0);
        fail("Expected AE");
      } catch (ArithmeticException expected) {
      }
    }
  }

  @AndroidIncompatible // slow
  @GwtIncompatible // TODO
  public void testMod() {
    for (long x : ALL_LONG_CANDIDATES) {

      }
    }
  }

  @GwtIncompatible // TODO
  public void testIntModZeroModulusFails() {
    for (long x : ALL_LONG_CANDIDATES) {
      try {
        LongMath.mod(x, 0);
        fail("Expected AE");
      } catch (ArithmeticException expected) {
      }
    }
  }

  @AndroidIncompatible // slow
  @GwtIncompatible // TODO
  public void testMod() {
    for (long x : ALL_LONG_CANDIDATES) {