static void copyMainClassFileFromHotwiredProgram(Class program, File destFile) {
  L<File> files = cast get(getClassLoader(program), 'files);
  for (File location : files) 
    if (location.isDirectory()) {
      File f = new File(location, "main.class");
      if (f.exists()) ret with copyFile(f, destFile);
    } else if (location.isFile()) pcall {
      ret with extractFileFromZipFile(location, "main.class", destFile);
    }
  fail("main.class not found in: " + files);
}