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From: | Lawrence Mitchell |
Subject: | bug#8711: 24.0.50; binding _ to unused values with lexical-binding |
Date: | Mon, 23 May 2011 10:01:04 +0100 |
User-agent: | Gnus/5.110018 (No Gnus v0.18) Emacs/24.0.50 (gnu/linux) |
Helmut Eller wrote: > 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. This latter is because cconv-analyse-use is not smart enough when checking for use of variables starting with an underscore. ;; -*- lexical-binding: t -*- (let ((_ nil)) (ignore _)) => Warning: variable `_' not left unused. This despite ignore not touching it. Lawrence -- Lawrence Mitchell <wence@gmx.li>
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