From: Jean Abou Samra <jean@abou-samra.fr>
To: tomas@tuxteam.de, 59221@debbugs.gnu.org
Subject: bug#59221: (file-exists? #f) raises an exception
Date: Sun, 13 Nov 2022 11:34:08 +0100 [thread overview]
Message-ID: <1b3d4aa0-139c-1491-cd08-57055b9bec7a@abou-samra.fr> (raw)
In-Reply-To: <Y3CSQm1lrGa7e7rl@tuxteam.de>
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Le 13/11/2022 à 07:44, tomas@tuxteam.de a écrit :
> You both have a point. Checking for existing predicates with a
> longer tradition, though:
>
> scheme@(guile-user)> (exact? "mumble")
> ice-9/boot-9.scm:1685:16: In procedure raise-exception:
> In procedure exact?: Wrong type argument in position 1: "mumble"
>
> seems to support Jean Abu's position that it is more customary to
> raise for an argument of the wrong type. Also `string<?', etc.
> do this. That seems to be the consensus.
Yes. I am not sure where the people in the Guile IRC got the idea
that a predicate shouldn't raise an exception. Lots of predicates in
Guile do, and that is very helpful because it catches mistakes.
> Naively, it just feel like it (file-exists? #f) should return #f.
Why?
> Would there be an objection to changing the definition of file-exists to
>
> (define (file-exists file)
> (and (string? file)
> (old-file-exists-code file)))
It would be inconsistent with the rest of Guile and I don't
see what it would help with.
Best,
Jean
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next prev parent reply other threads:[~2022-11-13 10:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-12 17:49 bug#59221: (file-exists? #f) raises an exception Joshua Branson via Bug reports for GUILE, GNU's Ubiquitous Extension Language
2022-11-12 17:57 ` Jean Abou Samra
2022-11-13 2:15 ` jbranso--- via Bug reports for GUILE, GNU's Ubiquitous Extension Language
2022-11-13 6:44 ` tomas
2022-11-13 10:34 ` Jean Abou Samra [this message]
2022-11-16 15:27 ` Joshua Branson via Bug reports for GUILE, GNU's Ubiquitous Extension Language
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