svoid gazelle_discord_playingGame(S gameName) {
  O presence = gazelle_discordPresence();
  // JDA 3.8
  virtual Game game = call(getClass_vmName(gazelle_jda(), "net.dv8tion.jda.core.entities.Game"), 'playing, gameName);
  if (game != null)
    call(presence, 'setGame, game);
  else {
    // JDA 4
    virtual Activity activity = call(getClass_vmName(gazelle_jda(), "net.dv8tion.jda.api.entities.Activity"), 'playing, gameName);
    call(presence, 'setActivity, activity);
  }
}

Began life as a copy of #1023456