Stefan Kangas <stefankangas@HIDDEN>
to control <at> debbugs.gnu.org
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Full text available.Received: (at submit) by debbugs.gnu.org; 9 Nov 2022 01:23:10 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Nov 08 20:23:10 2022 Received: from localhost ([127.0.0.1]:38448 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1osZo5-0000xz-TT for submit <at> debbugs.gnu.org; Tue, 08 Nov 2022 20:23:10 -0500 Received: from lists.gnu.org ([209.51.188.17]:58728) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <michael_heerdegen@HIDDEN>) id 1osZo4-0000xs-Hn for submit <at> debbugs.gnu.org; Tue, 08 Nov 2022 20:23:08 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <michael_heerdegen@HIDDEN>) id 1osZo4-0003RT-Cs for bug-gnu-emacs@HIDDEN; Tue, 08 Nov 2022 20:23:08 -0500 Received: from mout.web.de ([217.72.192.78]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <michael_heerdegen@HIDDEN>) id 1osZny-0001dC-Gz for bug-gnu-emacs@HIDDEN; 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envelope-from=michael_heerdegen@HIDDEN; helo=mout.web.de 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: -0.7 (/) X-Debbugs-Envelope-To: submit Cc: okamsn@HIDDEN 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: -2.4 (--) Hello, In emacs-help (Okamsn <okamsn@HIDDEN>) it has been pointed to the issue that `iter-yield' (from generator.el) is not supported in some contexts - contexts where yielding happens from inside a lambda expression or directly (like here when mapping over a sequence), e.g. (setq iter-maker (iter-lambda (x) (seq-doseq (item x) (iter-yield item)))) (setq my-iter (funcall iter-maker '(1 2 3))) (iter-next my-iter) ~~> (void-function cps-internal-yield) (seq-doseq expands to more or less just mapc+lambda) or (setq iter-maker (iter-lambda (x) (seq-do #'iter-yield x))) (setq my-iter (funcall iter-maker '(1 2 3))) (iter-next my-iter) ~~> (error "=E2=80=98iter-yield=E2=80=99 used outside a generator") These examples are written correctly but seem to hit an undocumented limitation of the implementation in generator.el I quote Stefan Monnier answering what should be done: > IIRC, one of the main limitations of `generator.el` is that it doesn't > handle `lambda` (and neither should you use `#'iter-yield`, IIRC). >=20 > I don't really know how to go about fixing it. >=20 > A good first step would be to make sure it emits an error (or a warning) > when you use `#'iter-yield` or when you call `#'iter-yield` from with > a lambda expression. TIA, Michael.
Michael Heerdegen <michael_heerdegen@HIDDEN>
:bug-gnu-emacs@HIDDEN
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Full text available.bug-gnu-emacs@HIDDEN
:bug#59140
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