svoid testFullTextSearcher(SS texts, S query, IF1<S, Iterable<S>> searcher, TimeCollector tc, int repetitions) {
  Cl<S> solution = asSet(keysWhereValueContainsString(query, texts));
  print("Solution: " + l(solution));
  repeat repetitions {
    long time = nanos();
    Cl<S> result = asCollection(searcher.get(query));
    tc.addNanos(nanos()-time);
    Set<S> diff = setDiff_bothWays(solution, result);
    //print("result: " + l(result) + ", diff: " + l(diff));
    for (S s : diff)
      fail("Searcher " + searcher + " was wrong on " + s);
  }
}

Began life as a copy of #1028992