GNU logs - #48315, boring messages

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Subject: bug#48315: (ice-9 match) does not suport #nil
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guile --version:
guile (GNU Guile) 3.0.5

(use-modules (ice-9 match))

(match #nil (_ 'xyzzy))
-->
While compiling expression:
Syntax error:
unknown location: unexpected syntax in form ()

(match '() (_ 'xyzzy))
--> $16 =3D xyzzy

Greetings,
Maxime.

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Maxime Devos <maximedevos@HIDDEN>
Subject: bug#48315: Acknowledgement ((ice-9 match) does not suport #nil)
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Date: Sun, 09 May 2021 15:58:02 +0000

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48315: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D48315
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Message sent to bug-guile@HIDDEN:

Subject: bug#48315: (ice-9 match) does not suport #nil
References: <08150bbff14abca3fe8e518ea3bc758c5f492fe1.camel@HIDDEN>
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From: Taylan Kammer <taylan.kammer@HIDDEN>
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--------------325E07C2B222F16409C90863
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This was mind-boggling to debug!

In syntax-rules, the pattern (x ...) will match #nil, since it
matches the empty list.  This can have surprising consequences.

Consider:

  (define-syntax test
    (syntax-rules ()
      ((test (x ...))
       (x ...))
      ((test x)
       x)))

  (test (+ 1 2))  ; => 3
  (test 123)      ; => 123
  (test #f)       ; => #f
  ;; However...
  (test #nil)     ; error


Anyway, attached is a patch to fix the issue in match.


- Taylan

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tags 48315 + patch
tags 21915 + patch
tags 39221 + patch
tags 39601 + patch
tags 40584 + patch

Last modified: Sat, 15 May 2021 18:00:02 UTC

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