Is there anyway to make a new Lua closure sharing the same code with old one but with different env table?

[Chaos Wang <chaoslawful@...>]

Hi,

I wonder if there is any way to clone a Lua closure, where the clones 
share the same Proto and upvalues but have different environment tables?

I tried lua_pushvalue(), but it only make a direct reference for GC-able 
object (which includes closures), so there can't be different 
environment tables coexisted.

Any ideas?

Thanks!