From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.bugs Subject: bug#45619: 28.0.50; pcase-let on MacOS doesn't work Date: Mon, 04 Jan 2021 23:08:59 +0100 Message-ID: <87wnws2w3o.fsf@web.de> References: <877dos50su.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="3192"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: jixiuf , 45619@debbugs.gnu.org To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Jan 04 23:10:12 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kwY3G-0000g3-JY for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 04 Jan 2021 23:10:10 +0100 Original-Received: from localhost ([::1]:44010 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kwY3F-0005Bn-Li for geb-bug-gnu-emacs@m.gmane-mx.org; 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Mon, 04 Jan 2021 23:09:00 +0100 In-Reply-To: (Stefan Monnier's message of "Mon, 04 Jan 2021 12:41:26 -0500") X-Provags-ID: V03:K1:by9xenLCXwIeS/8wnXu0T6kqNFUXCFMhF7oEhbeBsvDw7Jul1BH kZ1HLrW8f0zS4PO4JjWCRPiYAqZEXzfxVaDU//pNpgLq2rZxY1QCnOeONIjXzrwgoZf92CZ fdEupebTh4rxM5qRK/e6f5lXRd8ZxPIbIP81RIbtJKrpAGNrb83r9TrEdGRFeRCOfH2IEf3 apgV1VGVUgcw9MucRjErg== X-UI-Out-Filterresults: notjunk:1;V03:K0:x08zz2a5ZWc=:tE07XOHy3lStE47b7h5hGs pXdbC9C73JpS/3vODNhp8+4rnVaQkwKMx5zq2v35G0HEG2+eefmriokYczxuxi4ZxNetWljyd eXLYTMckAbm6tg6S9T8UDhuyjBkG4om9YC9Hs7R5jIENw3Es9uRAgQzrtBz1WlhltBkNisdL8 P66k/S0XF3ZSG9WWQXaEper4yQc4SOdAAbDDavkVYSW70NRwo4zVMlyHNhpN0gY1SzP9JO8E/ uIJbOUNOCIc+mdYcwiQUaccHSmQ9pne2hHE11Lt53jbMXmbboqb4CHjZzVG0E9XI2zH4Stfry Uv6R7Dj2oCSZiula8m4Fx07XKw4NqP2NVYGvRMWAusNwQKpIDDSGxmq4zLGF4JvdW325lRrO3 uHEq4Y7DLkbLm5U643trAJbI5qvp9Sxcg/pDqPPUoMlFQTsGioffbWAlKC/iMTWCzMA53dKA5 j9smcVzcLTZyvh8WuPNQ+sEqMzWD+flMjbXjabj2KbFvAH99aIl/VOAz5YXCBjII4NgdpTBKm FWPKjhgg7RWKRNTpYn9hXA8a9t0A1zs2yrYshyTeG8QlGwi4buAootyt0GxdpAVvADfmNBuey 7+StL9RFc5m+DusM/q9589E2PA+mz7ZrrS2Rx7YOEAL8VIjywFuB43XP05PjpnsyY8aEPm9Lu UfSDaQypQBKvzOhRscjrBh3lSBkZwG7VUhdxaoafHOC96sya6Dp1o7fP6bdYh2jScWR3e6M58 JrCmjYYhNJn2veitSeB/aIeN9hjWENqpMBaYBe+A4ZDpuXLoQU1bF+VhPhBbtXcXy85C+LHh X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:197338 Archived-At: Stefan Monnier writes: > It's messier than that: the issue is that it doesn't bind variables > which aren't used lexically (this is needed to avoid spurious warnings > about unused vars when the var is used in on place but not in another). BTW, a similar issue (pitfall) I faced was that I sometimes expect that when a variable is already bound, already the first appearance of the symbol would be turned into an equality test. I wonder if pcase variable bindings could be hygienic in the sense that they would use fresh symbols internally. That would maybe make the semantics clearer. Michael.