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From: Stefan Monnier <monnier@iro.umontreal.ca>
To: rms@gnu.org
Cc: tomo@cx4a.org, emacs-devel@gnu.org
Subject: Re: Should lexical-let use let in the situation lexical-binding is t ?
Date: Tue, 18 Sep 2012 20:41:30 -0400	[thread overview]
Message-ID: <jwvwqzq3kxn.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <E1TE6V5-0007zD-0M@fencepost.gnu.org> (Richard Stallman's message of "Tue, 18 Sep 2012 18:42:39 -0400")

>     As mentioned in my reply there, the two aren't quite compatible (because
>     (lexical-let ((tab-width 4)) foo) will be a lexical binding, whereas
>     (let ((tab-width 4)) foo) will be a dynamic binding)
> Is it really a sensible thing to make a lexical binding for a variable
> that is normally dynamic?

We don't need to answer this question, because the difference between
`let' and `lexical-let' in this respect is more likely to be accidental.

This said, there can be good reasons to force a lexical binding, when
you fear that the code might be run in a context where the variable
might happen to be defvar'd.


        Stefan



  reply	other threads:[~2012-09-19  0:41 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-18 10:28 Should lexical-let use let in the situation lexical-binding is t ? Tomohiro Matsuyama
2012-09-18 12:44 ` Stefan Monnier
2012-09-18 22:42   ` Richard Stallman
2012-09-19  0:41     ` Stefan Monnier [this message]
2012-09-19 14:12       ` Richard Stallman
2012-09-19 19:01         ` Stefan Monnier
2012-09-19 22:06         ` Sam Steingold
2012-09-20  3:26           ` Stefan Monnier
2012-09-20 15:06             ` Sam Steingold
2012-09-19  1:20   ` Sam Steingold
2012-09-19  7:43     ` Nix
2012-09-21 18:18   ` Tomohiro Matsuyama
2012-09-21 21:18     ` Stefan Monnier

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