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I feel awfully stupid, but could anyone explain (or give a reference for) what a "closure" is?

I have not been able to figure this out yet. I'm guessing it's something from functional programming.

Thank you and sorry for the annoyance,


  From: Ignacio Castaño <>
Subject: Re: closure upvalues

Roberto Ierusalimschy wrote:
> Is it possible to get the closure upvalues without calling it?

No (maybe we will add this facility to the API).