svoid test_indexOfRangePredicate_IIntIntPred(int maxLength default 8) {
  for (S word : allWordsOfAlphabet_maxLength(maxLength, "ft")) {
    L<Bool> l = map(characters(word), c -> c == 't');
    assertEqualsVerbose(word, smartIndexOf(l, true),
      indexOfRangePredicate_IIntIntPred(l(l), (i, j) -> any(subList(l, i, j))));
  }
}