sbool addByteCodePathToClassLoader(ClassLoader cl, File bytecode, S libraryID default null) ctex {
  // new method signature
  Bool b = cast callOpt(cl, "addFile", bytecode, libraryID);
  
  if (b == null)
    // legacy method signature
    b = isTrue(call(cl, "addFile", bytecode));
    
  if (b) print("Added byte code path " + bytecode + " to " + cl
    + appendBracketed(libraryID));
  ret b;
}