static LS findFunctionDefs(S s) {
  ret findFunctionDefs(javaTok(s));
}

static L<S> findFunctionDefs(L<S> tok) {
  new LS functions;
  
  var keywords = findFunctionDefs_keywords();
  
  if (tok instanceof IContentsIndexedList2) {
    for (S keyword : keywords) {
      TreeSet<HasIndex> indices = tok/IContentsIndexedList2.indicesOf_treeSetOfHasIndex(keyword);
      if (indices != null)
        for (HasIndex i : indices)
          findFunctionDefs_step(tok, i.idx, functions);
    }
  } else {
    int n = l(tok);
    for (int i = 1; i < n; i += 2)
      if (keywords.contains(tok.get(i)))
        findFunctionDefs_step(tok, i, functions);
  }
  ret functions;
}

// we found one of the keywords listed above at token i
// now scan forward for a function definition
svoid findFunctionDefs_step(LS tok, int i, LS functions) {
  S t = tok.get(i);
  int j = i+2, n = l(tok);
  while (j < n && !findFunctionsDefs_checkToken(tok.get(j)))
    j += 2;
  if (isIdentifier(tok.get(j-2)) &&
    eqGet(tok, j, "(") || eqGet(tok, j, "{") && eq(t, "svoid"))
    functions.add(tok.get(j-2));
}

sbool findFunctionsDefs_checkToken(S t) {
  if (t.length() != 1) false;
  char c = t.charAt(0);
  ret c == ';' || c == '=' || c == '(' || c == '{' /*|| c == '#' XXX*/;
}