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- Subject: Re: Let's not break existing scripts.
- From: Tom N Harris <telliamed@...>
- Date: Sat, 12 Nov 2011 17:29:06 -0500
On 11/10/2011 07:13 PM, Luiz Henrique de Figueiredo wrote:
Would it be possible for the compiler to ensure that _ENV is always the first upvalue?
Possible, yes, but it would bloat *all* functions and many functions do
not use globals at all.
How about ensure that if _ENV is present then it is the first upvalue?
So you check for it without a loop. The first upvalue is either _ENV,
some other variable, or nil; only the first case references globals.
Furthermore, don't strip the _ENV name and it will still be found even
when other variable names are removed.