static S tok_autoCloseBrackets(S s) {
  ret join(tok_autoCloseBrackets(javaTok(s)));
}

// modifies tok
static L<S> tok_autoCloseBrackets(L<S> tok) {
  bigloop: for (int i = 1; i < l(tok); i += 2) {
    if (eq(tok.get(i), ";")) {
      int j, level = 0;
      for (j = i-2; j >= 0; j -= 2) {
        S t = tok.get(j);
        if (eqOneOf(t, ";", "{")) break;
        if (eq(t, "}")) break; // TODO: skip over until other end of bracket
        else if (eq(t, ")")) --level;
        else if (eq(t, "(")) {
          if (eq(get(tok, j-2), "for")) break;
          if (eq(get(tok, j-4), "for")) break; // for ping
          ++level;
        }
      }
      while (level-- > 0) {
        tok.add(i++, ")");
        tok.add(i++, "");
      }
    }
  }
  ret tok;
}

Began life as a copy of #1006346