From: Stefan Israelsson Tampe <stefan.itampe@gmail.com>
To: "Ludovic Courtès" <ludo@gnu.org>, 9567@debbugs.gnu.org, wingo@pobox.com
Subject: bug#9567: curious match bug (?)
Date: Fri, 23 Sep 2011 18:24:30 +0200 [thread overview]
Message-ID: <CAGua6m18jOqkY8rWajh+L+JyNx=t=vEjRwDaVdmqfsVq+D_5qQ@mail.gmail.com> (raw)
In-Reply-To: <87d3ers4fc.fsf@gnu.org>
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On the other hand
(let ((pat '(a _ ...)))
(match '(x y z) (pat #t)))
$1 = #t
as well,
a more canonical example of this problem (where I saw it first)
are when using 'and' e.g.
(define a '(1 2))
(match a ((and (a 2) (1 b)) (+ a b)) (_ #f))
-> #f
But with my fix you wil get the correct 3.
Now the reson are that for 'and' as well as for '$' another location a is
under the command
of an implicit (let ((a car)) ...). One could perhaps argue that this is a
bug in syntax handling but I would not think so. Anyway maybe we should
consider moving this fix upstream.
/Stefan
2011/9/23 Ludovic Courtès <ludo@gnu.org>
> Could it be a feature?
>
> (let ((pat '('a _ ...)))
> (match '(a b c) (pat #t)))
> => #t
>
> Ludo'.
>
>
>
>
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next prev parent reply other threads:[~2011-09-23 16:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-21 3:34 bug#9567: curious match bug (?) Andy Wingo
2011-09-21 12:15 ` Stefan Israelsson Tampe
2011-09-23 14:45 ` Ludovic Courtès
2011-09-23 16:24 ` Stefan Israelsson Tampe [this message]
2011-09-24 14:51 ` Andy Wingo
2011-09-24 15:01 ` bug#9567: `match' bug ? Andy Wingo
2011-09-25 6:59 ` Alex Shinn
2011-10-15 14:07 ` Ludovic Courtès
2011-10-16 7:28 ` Alex Shinn
2011-10-16 16:38 ` Ludovic Courtès
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