static S tok_addSemicolon(L<S> tok) {
  S lastToken = get(tok, l(tok)-2);
  if (eqOneOf(lastToken, "}", ";")) ret join(tok);
  ret join(tok) + ";";
}

static S tok_addSemicolon(S s) {
  ret tok_addSemicolon(javaTok(s));
}