static S replaceSecondLong(S s, long l) {
  L<S> tok = javaTok(s);
  int i = jfind(tok, "<int>");
  if (i < 0) ret s;
  i = jfind(tok, i+2, "<int>");
  if (i < 0) ret s;
  tok.set(i, str(l));
  ret join(tok);
}