} catch (Error expected) {
      assertEquals(ERROR, expected);
      return;
    }
    fail();
  }

  public void testGetCheckedUntimed_badExceptionConstructor_failsEvenForSuccessfulInput()
      throws Exception {
    assertThrows(
        IllegalArgumentException.class,
        () -> getChecked(immediateFuture("x"), ExceptionWithBadConstructor.class));
  }