is setfenv useless?

["mr. Aleph" <mraleph@...>]

Hi,

 I last night was hacking through Xavante and trying to make it work 
with lua 5.1. And suddenly I thought: "What a strange code!"

----------------------------------------
-- a strange code from venv.lua
-- skipped code does smth equivalent to
-- ng = {}
-- ng.require = _G.require
setfenv(ng.require, env)
----------------------------------------

I think this is probably a bug in venv. This code is trying to change 
fenv of the global require.

So I think:

While there are no possibility to clone functions, setfenv 
(debug.setfenv) remains almost useless.

Am I correct?

--mraleph