svoid packageProgram(S outJarName, S programID, O... _) {
  packageProgram(javaxArtifactsDir(assertNempty(outJarName)), programID, _);
}

svoid packageProgram(File outJar, S programID, O... _)
  ProgramPackager p = new (outJar, programID);
  optPar LS excludedSnippets;
  if (excludedSnippets != null)
    p.excludedSnippets = excludedSnippets;
  p.go();
}