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On Tue, 12 Jan 2010 17:25:36 +0200, Roberto Ierusalimschy <roberto@inf.puc-rio.br> wrote: 


We tried to restrict such uses. Basically, if you create a new function,
you can set its environment. Otherwise, the function itself should be
responsible for its own environment (using lexical environments).


Could environment be implemented as an unnamed upvalue?