derived.cancel(false);
    assertTrue(primary.isCancelled());
    assertFalse(primary.wasInterrupted());
  }

  // catching() uses a plain Function, so there's no testCatching_resultCancelledAfterFallback().

  // catching() uses a plain Function, so there's no testCatching_nullInsteadOfFuture().

  // Some tests of the exceptionType parameter:

    derived.cancel(false);
    assertTrue(primary.isCancelled());
    assertFalse(primary.wasInterrupted());
  }

  // catching() uses a plain Function, so there's no testCatching_resultCancelledAfterFallback().

  // catching() uses a plain Function, so there's no testCatching_nullInsteadOfFuture().

  // Some tests of the exceptionType parameter: