From: Josselin Poiret via Bug reports for GNU Guix <bug-guix@gnu.org>
To: Justin Veilleux <terramorpha@cock.li>, 68413@debbugs.gnu.org
Subject: bug#68413: Ungexp doesn't work on deep lists
Date: Sat, 13 Jan 2024 12:38:38 +0100 [thread overview]
Message-ID: <87ttnhh39d.fsf@jpoiret.xyz> (raw)
In-Reply-To: <87v87yvw2y.fsf@cock.li>
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Hi Justin,
Justin Veilleux <terramorpha@cock.li> writes:
>> (define packages
>> (list
>> (cons "coreutils" coreutils)
>> (cons "make" gnu-make)
>> ...))
>>
>> #~(for-each
>> (lambda (f)
>> ... do-something)
>> '#$packages)
>
> If I send a patch to "fix" this, will it be usefull or is there a reason
> for this behavior?
I think IMO that it's a bug, but it's also quite tricky to properly
traverse deep structures like this. The bug comes from the fact that in
gexp->sexp, we traverse lists by matching the reference with (refs ...),
but that doesn't match if the reference is a pair instead. Then, it
tries to match with ($ <gexp-input> (? self-quoting? x)), which does
match since self-quoting? apparently returns #t on a pair, whether or
not its constituents are also self-quoting.
Best,
--
Josselin Poiret
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next prev parent reply other threads:[~2024-01-13 11:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-13 1:52 bug#68413: Ungexp doesn't work on deep lists Justin Veilleux
2024-01-13 11:38 ` Josselin Poiret via Bug reports for GNU Guix [this message]
2024-01-15 9:46 ` Ludovic Courtès
2024-01-15 16:28 ` Josselin Poiret via Bug reports for GNU Guix
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