static S replaceFirstLong(S s, long l) {
  ret replaceFirstLong(s, str(l));
}

static S replaceFirstLong(S s, S replacement) {
  L<S> tok = javaTok(s);
  int i = jfind(tok, "<int>");
  if (i < 0) ret s;
  tok.set(i, replacement);
  ret join(tok);
}