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bug#6203: Frame-local variables break let-binding

From: Nathan Weizenbaum
Subject: bug#6203: Frame-local variables break let-binding
Date: Mon, 17 May 2010 10:12:47 -0700

Sorry, the "%d" thing was a bug. It looks like the let-binding error was introduced after my last checkout, though, so I guess that's deal with.

This all raises the issue, though: what's the accepted replacement for frame-local variables, and why are they deprecated in the first place? My package has rather a few of them, and it's very useful to be able to use them like variables. I want to make them available for user customization, let-bind them, and use them without having to go through lots of manual frame-parameter rigamarole each time. I would rather not break any user customizations using these variables. So what should I do?

On Mon, May 17, 2010 at 6:45 AM, Stefan Monnier <address@hidden> wrote:
> I've run into a bug with GNU Emacs (i686-pc-linux-gnu, GTK+
> Version 2.16.1, checked out from the repo a week or so ago). Let-binding
> frame-local variables doesn't work: although the let-bound value is correct
> within the `let', it doesn't get reset after the `let'. To reproduce, just
> run http://gist.github.com/403208.

I definitely cannot reproduce the behavior you show on that page:
The code stops at "(message "Before: %d" foo)" because foo has
value nil at that point which is incompatible with the %d format.
If I get rid of this bug, then I bump into the next error which is that
`let' raises "Frame-local vars cannot be let-bound".

Note that frame-local variables have been deprecated since Emacs-22.2,
and I definitely intend to remove support for them (tho for Emacs-24.1,
the plan is currently only to remove support for let-binding them).


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