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It's a largely hidden element of the language that has no concrete, accessible reflection in Lua.

On Wed, 31 Mar 2010 13:51:26 -0600, Petite Abeille <> wrote:

On Mar 31, 2010, at 9:07 PM, Roberto Ierusalimschy wrote:

No. It implies that you will be able to do what setfenv/getfenv did
by using debug.setupvalue/debug.getupvalue.

Hmmm... if that's the case... why not keep setfenv/getfenv and re-implement it in terms of _ENV?

(There are some caveats
[see message from Mark Hamburg], but it is mostly doable.)

Are you referring to the, hmm, subtlety about shared _ENV?

"If you want to follow the original semantics, it is still possible (mostly), but it is not trivial. "

That seems a good reason enough (i.e. not trivial) to let setfenv/getfenv implement it, no?

Also, out of curiosity, what's driving that sudden hatred for setfenv/getfenv and the apparent new quest to replace it with these various 'in' or '_ENV' or ... proposals?