From: Leo Liu <sdl.web@gmail.com>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: 19670@debbugs.gnu.org
Subject: bug#19670: 24.4; pcase-let bug?
Date: Mon, 26 Jan 2015 22:27:20 +0800 [thread overview]
Message-ID: <m2lhkpr513.fsf@gmail.com> (raw)
In-Reply-To: <jwva918u5s6.fsf-monnier+emacsbugs@gnu.org> (Stefan Monnier's message of "Sat, 24 Jan 2015 00:07:41 -0500")
On 2015-01-24 13:07 +0800, Stefan Monnier wrote:
> Feature: the `pcase' form can have several branches (and defaults to
> nil if no branch matches), whereas the `pcase-let' form doesn't have the
> luxury of a "default case if it doesn't match", so we have to choose
> between "signal an error if it doesn't match" or "pretend it matched".
> I opted for the second choice.
I still find this inconsistent. Another similar-looking example:
(pcase 'whatever
((let `(,x) '(1 2 3)) (list x))) ;; => nil
It seems to make more sense for pcase-let to signal an error or bind X
to nil. WDYT?
Leo
next prev parent reply other threads:[~2015-01-26 14:27 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-24 2:42 bug#19670: 24.4; pcase-let bug? Leo Liu
2015-01-24 5:07 ` Stefan Monnier
2015-01-26 14:27 ` Leo Liu [this message]
2015-01-26 22:59 ` Stefan Monnier
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