AsyncFunction<Foo, Bar> function =
        new AsyncFunction<Foo, Bar>() {
          @Override
          public ListenableFuture<Bar> apply(Foo unused) {
            throw new AssertionFailedError("Unexpected call to apply.");
          }
        };
    assertTrue(transformAsync(input, function, directExecutor()).cancel(false));
    assertTrue(input.isCancelled());
    assertFalse(input.wasInterrupted());
  }

    AsyncFunction<Foo, Bar> function =
        new AsyncFunction<Foo, Bar>() {
          @Override
          public ListenableFuture<Bar> apply(Foo unused) {
            throw new AssertionFailedError("Unexpected call to apply.");
          }
        };
    assertTrue(transformAsync(input, function, directExecutor()).cancel(false));
    assertTrue(input.isCancelled());
    assertFalse(input.wasInterrupted());
  }

   * Comparator}, which can violate the natural ordering. Using this method (or in general using
   * {@code Range}) with unnaturally-ordered maps can lead to unexpected and undefined behavior.
   *
   * @since 20.0
   */
  @GwtIncompatible // NavigableMap
  public static <K extends Comparable<? super K>, V extends @Nullable Object>