static L<S> tok_roundBracketsToQuoted(S s) {
  L<S> tok = javaTok(s);
  while true {
    int i = tok.lastIndexOf("(");
    if (i < 0) ret tok;
    int j = indexOf(tok, ")", i);
    if (j < 0) ret tok;
    tok.set(i, quote(join(subList(tok, i+1, j))));
    tok.subList(i+1, j+1).clear();
    assertTrue(odd(l(tok)));
  }
}