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Re: [Emacs-diffs] master 0528a7c: Ensure that expand-file-name returns a

From: Stefan Monnier
Subject: Re: [Emacs-diffs] master 0528a7c: Ensure that expand-file-name returns an absolute file name
Date: Tue, 09 Jul 2019 11:25:50 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

> It isn't entirely arbitrary.

I'd have gone with "/", but I also consider that as arbitrary: I don't
think there can be a non-arbitrary choice here, other than signaling
an error because we don't have any information that can give us a hint
about what was the intended absolute directory.

> I think expand-file-name should try to avoid signaling an error as
> much as possible, because it is called by many primitives and core
> functions.  If we signal an error, we risk getting the users into a
> situation where they cannot even shut down Emacs, let alone do
> something less trivial.

A relative default-directory is something extremely rare, so if some
operations like C-x C-c fail in that case I wouldn't mind.


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