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Re: Should 'signal' sometimes return?

From: Stefan Monnier
Subject: Re: Should 'signal' sometimes return?
Date: Thu, 21 Jul 2016 11:43:11 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

> Bug#24047 proposes changing Elisp's 'signal' function to not
> return. Although this has been the documented behavior for decades,
> apparently there has been a back door in 'signal' for nearly as long, which
> causes 'signal' to return sometimes under control of the Elisp debugger. The
> proposal is to remove this backdoor. If this proposed change to Emacs would
> cause problems for you, please send email to address@hidden Thanks.

There's indeed one back-door, which is that Fsignal can return from
a `quit' signal.  This is part of the support for debug-on-quit and
I wouldn't want to lose this.

I agree that the current situation is unsatisfactory.


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