// return (ok, result/error)
static Pair<Bool, S> transpileForServer_returnPair(S progID, S mode) {
  if (!eqOneOf(mode, null, "", "quick")) refreshTranspiler();
  new Flag error;
  S out = hijackPrint_tee(r {
    try {
      transpileForServer(progID);
    } catch print e {
      error.raise();
    }
  });
  if (error!)
    ret pair(false, out);
  else
    ret pair(true, "Transpiled & uploaded " + fsI(progID) + "!");
}