default filename should be a uuid

[ORESoftware]

something like this:

function requireFromString2(src, filename) {
  var Module = module.constructor;
  filename = filename || uuid();    // <<<<  instead of defaulting to '', default to a uuid
  var m = new Module();
  m._compile(src, filename);
  return m;  // return module not module.exports, so the user can get to the filename or whatnot
}