Taylan Kammer <taylan.kammer@HIDDEN>
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To: 48315 <at> debbugs.gnu.org
From: Taylan Kammer <taylan.kammer@HIDDEN>
Subject: (ice-9 match) does not suport #nil
Message-ID: <7cb7ec76-655c-e55a-17a6-99d25b3926d1@HIDDEN>
Date: Wed, 12 May 2021 22:03:57 +0200
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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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name="0001-Fix-match-when-used-directly-on-the-nil-constant.patch"
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filename*0="0001-Fix-match-when-used-directly-on-the-nil-constant.patch"
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--------------325E07C2B222F16409C90863--
bug-guile@HIDDEN:bug#48315; Package guile.
Full text available.Received: (at submit) by debbugs.gnu.org; 9 May 2021 15:57:58 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sun May 09 11:57:58 2021 Received: from localhost ([127.0.0.1]:55989 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1lfloc-00010s-B5 for submit <at> debbugs.gnu.org; Sun, 09 May 2021 11:57:58 -0400 Received: from lists.gnu.org ([209.51.188.17]:47952) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <maximedevos@HIDDEN>) id 1lfloX-00010i-Bo for submit <at> debbugs.gnu.org; Sun, 09 May 2021 11:57:56 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49970) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <maximedevos@HIDDEN>) id 1lfloW-0001ez-PS for bug-guile@HIDDEN; Sun, 09 May 2021 11:57:53 -0400 Received: from laurent.telenet-ops.be ([2a02:1800:110:4::f00:19]:47156) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from <maximedevos@HIDDEN>) id 1lfloU-0005nw-Mc for bug-guile@HIDDEN; Sun, 09 May 2021 11:57:52 -0400 Received: from butterfly.local ([213.251.116.230]) by laurent.telenet-ops.be with bizsmtp id 2fxm250094yL7Jl01fxnte; Sun, 09 May 2021 17:57:47 +0200 Message-ID: <08150bbff14abca3fe8e518ea3bc758c5f492fe1.camel@HIDDEN> Subject: (ice-9 match) does not suport #nil From: Maxime Devos <maximedevos@HIDDEN> To: bug-guile@HIDDEN Date: Sun, 09 May 2021 17:57:41 +0200 Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-LKPrJoczsIGnLbrFrmMX" User-Agent: Evolution 3.34.2 MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=telenet.be; s=r21; t=1620575867; bh=EOXRpkd0M6kaLmvm+BmFaRnWarFM53M7PinTjsdB+yk=; h=Subject:From:To:Date; b=byxcLsXWLhFRxD2+XDQQtB3nk7El1Wm3gVDhRE5nccnUvdEX7KtpHwrc/iu9YAhqI UKhUyd2Ds6Bp/zbvqLq4NA/cAtQ7wIrwlH3GUvOaH7IPohvafQVBS6dgtIR/IjbIPA b+xknefVn5jq4wmXfUxTJ7pXLxeszdn6GH+hVXWRsAbqMhVJRCRCY39HeMCE7ba5z6 WbFEVUac8QGE23FIxow7N/Nhp15X30Fk91p61loh01lZKJimdS6eMEnsHFHghD1WF8 upUoocVrjaAE3BwDt0G4ETxX9kXq5vjNyLwyqW/KkSGr4OicmHmn4tRM1B56Wf8RZE ux72JWjZ+dREA== Received-SPF: pass client-ip=2a02:1800:110:4::f00:19; envelope-from=maximedevos@HIDDEN; helo=laurent.telenet-ops.be X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -0.5 (/) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -2.3 (--) --=-LKPrJoczsIGnLbrFrmMX Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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. --=-LKPrJoczsIGnLbrFrmMX Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iI0EABYKADUWIQTB8z7iDFKP233XAR9J4+4iGRcl7gUCYJgGdRccbWF4aW1lZGV2 b3NAdGVsZW5ldC5iZQAKCRBJ4+4iGRcl7mKhAQCplG5K3YIAXI8QeSNHgObLxPLc imm+aKF8Im4XKoY0eQEA2qhD5VevMVetEwUfULkFQwaKVRfRXPTBpeiZdcqWSQo= =H+jD -----END PGP SIGNATURE----- --=-LKPrJoczsIGnLbrFrmMX--
Maxime Devos <maximedevos@HIDDEN>:bug-guile@HIDDEN.
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