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bug#8711: bug#26960: 26.0.50; Complaints about unused variable in cl-des
From: |
Lars Ingebrigtsen |
Subject: |
bug#8711: bug#26960: 26.0.50; Complaints about unused variable in cl-destructuring-bind |
Date: |
Sun, 08 May 2022 14:33:49 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
Helmut Eller <eller.helmut@gmail.com> writes:
> There seems be no way to avoid a warning in code like this:
>
> ;; -*- lexical-binding: t -*-
> (eval-when-compile (require 'cl))
> (defun foo (x) (destructuring-bind (_) x))
> (defun bar (x) (destructuring-bind (_) x (ignore _)))
>
> In foo the compiler complains because _ is never used and
> it bar it complains because it is used.
(I'm going through old bug reports that unfortunately weren't resolved
at the time.)
I can reproduce this in Emacs 25.1, but not in Emacs 29. That is,
there's no warning for `foo'. There's still a warning for `bar', but
that's correct, isn't it? `ignore' is just a normal function, so _ is
used there.
However, this example from a merged bug report is giving a warning:
> ;;; -*- lexical-binding: t; -*-
> (require 'cl-lib)
> (cl-destructuring-bind (&whole a b &rest _) '(1 2)
> (print (list a b)))
And that seems like a bug?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- bug#8711: bug#26960: 26.0.50; Complaints about unused variable in cl-destructuring-bind,
Lars Ingebrigtsen <=