sbool jreplace_multi(LS tok, LS ins, S out) {
  bool change = false;
  for (S in : ins)
    if (jreplace(tok, in, out))
      change = true;
  ret change;
}

// doesn't loop
sS jreplace_multi(S s, S... replacements) {
  LS tok = javaTok(s);
  bool change;
  for (int i = 0; i < l(replacements); i += 2)
    if (jreplace(tok, replacements[i], replacements[i+1]))
      set change;
  ret change ? join(tok) : s;
}