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bug#15294: 24.3.50; js2-mode parser is several times slower in lexical-b


From: Dmitry Gutov
Subject: bug#15294: 24.3.50; js2-mode parser is several times slower in lexical-binding mode
Date: Sat, 05 Oct 2013 06:27:19 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0

On 04.10.2013 16:52, Stefan Monnier wrote:
Not sure if I should close this issue now or at least wait until
byte-compile--use-old-handlers is nil by default.

Your call.  I'm not completely sure when we should change it: setting it
to nil will mean that pretty much any file compiled with the new Emacs
won't run on older Emacsen.  I think I'd like to see 24.4 release before
making the change.

No problem, guess then I'll leave this open until then.

I'll do the code reshuffling discussed earlier, but actually having a performance improvement will be a better reason to switch to lexical binding.

> But please do set it in your .emacs ASAP so it gets wider testing.

Good idea, done.





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