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Re: lexical-binding is turned on in more use cases

From: Michael Heerdegen
Subject: Re: lexical-binding is turned on in more use cases
Date: Wed, 11 Mar 2020 03:02:09 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Noam Postavsky <address@hidden> writes:

> Actually, it only fails if you evaluate the (defun my-make-counter
> ...) with lexical-binding off.

That's what I expected, too, but I tested it quickly and it was as I
said...sorry, it's late here.  Maybe byte compiling the source also
makes a difference?

> > Were does M-: break for you with the change?
> Please, let's not go in circles. An example was already given
> upthread: https://lists.gnu.org/r/emacs-devel/2020-03/msg00219.html
> Essentially some cc-mode variables are only declared dynamic locally
> within individual files. Without lexical binding the only difference
> this causes is that they are unbound at top level; but with
> lexical-binding, outside of the declaring files (e.g., in M-:
> expressions), let-binding those variables doesn't bind the value
> dynamically.

I meant "real" examples (that are not actually coding errors).  I
guess, like let-binding a variable that is not (yet) declared around an
expression whose evaluation will autoload the declaration but it's too
late for that binding and you get something unexpected.


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