From: Michael Heerdegen <michael_heerdegen@web.de>
To: 13678@debbugs.gnu.org
Subject: bug#13678: 24.2.93; pcase: mention list-like QPatterns in the doc
Date: Mon, 11 Feb 2013 14:37:48 +0100 [thread overview]
Message-ID: <87fw13dl8z.fsf@web.de> (raw)
In-Reply-To: <jwvliavzkx3.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Sun, 10 Feb 2013 20:43:57 -0500")
Hi Stefan,
> > Sure, `(QPAT1 . QPAT2)' also matches lists - but `(QPAT1 . QPAT2)' and
> > `(QPat1 ...QPatn)' are different forms (expressions)
>
> Actually, no, they are identical:
>
> (QPAT1 QPAT2 QPAT3) is indistinguishable from
> (QPAT1 . (QPAT2 . (QPAT3 . nil)))
>
> the equivalence between the two is imposed by the reader, long before we
> know that these things will be "patterns in a pcase" rather than
> expressions, or data in a quoted thingy, ...
Simply right, thanks. I wonder, however, if that's clear for every
user. Nonetheless, there are enough examples in
(elisp) Pattern matching case statement
that use the (QPAT1 QPAT2 QPAT3) syntax. So, I'll close this, thanks.
Regards,
Michael.
prev parent reply other threads:[~2013-02-11 13:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-10 17:49 bug#13678: 24.2.93; pcase: mention list-like QPatterns in the doc Michael Heerdegen
2013-02-11 1:43 ` Stefan Monnier
2013-02-11 13:37 ` Michael Heerdegen [this message]
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