GNU bug report logs - #42360
[feature/native-comp] miscompilation(?) of functions with non local exits

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Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Andrea Corallo <akrl <at> sdf.org>
Cc: bug-gnu-emacs <at> gnu.org, monnier <at> iro.umontreal.ca
Subject: Re: [feature/native-comp] miscompilation(?) of functions with non
 local exits
Date: Wed, 15 Jul 2020 17:25:11 +0300

> From: Andrea Corallo <akrl <at> sdf.org>
> Cc: Eli Zaretskii <eliz <at> gnu.org>, Stefan Monnier <monnier <at> iro.umontreal.ca>
> Date: Wed, 15 Jul 2020 08:24:00 +0000
> 
> ===
> (let (x)
>   (ignore-errors
>     (setq x t)
>     (error "foo"))
>   x)
> ===
> 
> Three options:
> 
>   1- Because setq is evaluated the expression should always evaluate to
>   t.
> 
>   2- Unwinding the original state of the stack is restored, when it was
>   saved 'x' was nil so the expression should evaluate to nil.
> 
>   3- This is unspecified.
> 
> The current stock implementaion does always 1 so I'm prone to just go
> for it but I wanted to double check to be on the safe side.

I tend to alternative 1 as well.

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