From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Christopher Wellons Newsgroups: gmane.emacs.bugs Subject: bug#31641: 26.1; iter-do variable not left unused warning Date: Tue, 29 May 2018 09:12:30 -0400 Message-ID: <20180529131230.kijx2bkcvcqsyhgg@nullprogram.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1527599472 3239 195.159.176.226 (29 May 2018 13:11:12 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 29 May 2018 13:11:12 +0000 (UTC) User-Agent: NeoMutt/20170113 (1.7.2) To: 31641@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue May 29 15:11:07 2018 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fNeP5-0000jI-5J for geb-bug-gnu-emacs@m.gmane.org; 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Tue, 29 May 2018 09:12:31 -0400 (EDT) Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 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.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:146694 Archived-At: When byte-compiling an iter-do form with a variable intended to be left=20 unused, the compiler emits a false warning: ;;; -*- lexical-binding: t; -*- (require 'generator) (iter-do (_ i)) ;; -> "Warning: variable =E2=80=98_=E2=80=99 not left unused" Giving the variable a name has the opposite effect, though it's not=20 a false warning in this case: (iter-do (v i)) ;; -> "Unused lexical variable =E2=80=98v=E2=80=99" This issue does not occur with similar, long-established forms: ;;; -*- lexical-binding: t; -*- (dolist (_ '(a b c))) (dotimes (_ 10)) ;; -> no warnings