GNU bug report logs - #13678
24.2.93; pcase: mention list-like QPatterns in the doc

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Package: emacs;

Reported by: michael_heerdegen <at> web.de

Date: Sun, 10 Feb 2013 17:49:02 UTC

Severity: minor

Found in version 24.2.93

Done: Michael Heerdegen <michael_heerdegen <at> web.de>

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 13678 <at> debbugs.gnu.org
Subject: bug#13678: 24.2.93; pcase: mention list-like QPatterns in the doc
Date: Sun, 10 Feb 2013 20:43:57 -0500

> 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, ...
  

        Stefan
This bug report was last modified 12 years and 103 days ago.

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