bug#60730: 29.0.60; Free variable with :buffer keyword in ert-with-temp-file

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: "J.P." <jp@neverwas.me>,  stefankangas@gmail.com,  60730@debbugs.gnu.org
> Date: Sun, 29 Jan 2023 10:56:08 +0100
> 
> On Jan 29 2023, Eli Zaretskii wrote:
> 
> >> From: "J.P." <jp@neverwas.me>
> >> Cc: 60730@debbugs.gnu.org,  stefankangas@gmail.com
> >> Date: Sat, 28 Jan 2023 18:00:40 -0800
> >> 
> >> When the value of `coding-system-for-write' is non-nil, only quoting it
> >> twice survives expansion:
> >> 
> >>   (setq coding-system-for-write ''raw-text)
> >>   (ert-with-temp-file myfile)
> >> 
> >>   -> (let* ((coding-system-for-write 'raw-text) ...)
> >> 
> >> Otherwise, we get a free variable:
> >> 
> >>   (setq coding-system-for-write 'raw-text)
> >>   (ert-with-temp-file myfile)
> >> 
> >>   -> (let* ((coding-system-for-write raw-text) ...)
> >
> > OK, in that case we should indeed solve this in the code by something
> > like the patch you proposed.
> 
> I am surprised that the commit worked for you when you installed it.  Do
> you perhaps have defined a global variable undecided-unix in your Emacs
> instance?

No.