sS tok_packageName(LS tok) {
  int i = jfind(tok, "package");
  if (i < 0) ret "";
  i += 2;
  int j = jfind(tok, i, ";");
  if (j < 0) ret "";
  ret join(codeTokensOnly(subList(tok, i-1, j)));
}

sS tok_packageName(S src) {
  Producer<S> p = javaTokC_producer(src);
  S t = p.next();
  if (!eq(t, "package")) ret "";
  new StringBuilder buf;
  while (!eqOneOf(t = p.next(), null, ";"))
    buf.append(t);
  ret str(buf);
}