// compile JavaX source, load classes & return main class
  // src can be a snippet ID or actual source code
  
  // requires class _x18
  
  static Class<?> hotwire(String src) tex {
    new List<File> libraries;
    File srcDir = _x18.transpileMain(src, libraries);
    
    File classesDir = _x18.TempDirMaker_make();
    String javacOutput = _x18.compileJava(srcDir, libraries, classesDir);
    System.out.println(javacOutput);
    URL[] urls = {classesDir.toURI().toURL()};
    
    // make class loader
    URLClassLoader classLoader = new URLClassLoader(urls);

    // load & return main class
    return classLoader.loadClass("main");
  }