static LS findFunctionDefsAtCurlyLevel(int curlyLevel, S s) {
  ret findFunctionDefsAtCurlyLevel(curlyLevel, javaTok(s));
}

static LS findFunctionDefsAtCurlyLevel(int targetCurlyLevel, LS tok) {
  new LS functions;
  
  var keywords = findFunctionDefs_keywords();
  
  int n = l(tok);
  int curlyLevel = 0;
  for (int i = 1; i < n; i += 2) {
    S t = tok.get(i);
    curlyLevel += curlyLevel(t);
    if (curlyLevel == targetCurlyLevel)
      if (keywords.contains(t))
        findFunctionDefs_step(tok, i, functions);
  }
  ret functions;
}