static IterableIterator<S> scanLog_iterator(S progID, S fileName) {
  ret scanLog_iterator(getProgramFile(progID, fileName));
}

static IterableIterator<S> scanLog_iterator(S fileName) {
  ret scanLog_iterator(getProgramFile(fileName));
}

static IterableIterator<S> scanLog_iterator(File file) {
  // TODO: opens all at once
  final Iterator<S> it = chainIterators(map linesFromFile(
    concatLists(earlierPartsOfLogFile(file), ll(file))));
  ret iteratorFromFunction(func -> S {
    while (it.hasNext()) {
      S s = it.next();
      if (isProperlyQuoted(s))
        ret unquote(s);
    }
    null;
  });
}