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bug#15326: 24.3; Incorrect "variable not left unused" in destructuring c
From: |
Christopher Wellons |
Subject: |
bug#15326: 24.3; Incorrect "variable not left unused" in destructuring cl-loop |
Date: |
Tue, 10 Sep 2013 14:25:33 -0400 |
User-agent: |
Notmuch/0.16 (http://notmuchmail.org) Emacs/24.3.1 (x86_64-pc-linux-gnu) |
The byte compiler emits an invalid warning about used "_" lexical
variables in cl-loop destructuring bindings. This was casually mentioned
in bug#8711, where destructuring-bind was fixed (presumably, since it's
fine now) but not loop.
Create a source file like so,
;;; -*- lexical-binding: t; -*-
(require 'cl-lib)
(cl-loop for (_ value) in '((a 1) (b 2))
collect value)
Then compile,
$ emacs -Q -batch -f batch-byte-compile tmp.el
In toplevel form:
tmp.el:3:1:Warning: variable `_' not left unused
Wrote /tmp/tmp.elc
In the macro expansion, the _ is declared in a `let', then later set
with `setq', "using" it.
In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.8.2)
of 2013-06-25 on sochi, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
System Description: Debian GNU/Linux unstable (sid)
Configured using:
`configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
'--localstatedir=/var/lib' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
'--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
'--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
--param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall'
'LDFLAGS=-Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''
- bug#15326: 24.3; Incorrect "variable not left unused" in destructuring cl-loop,
Christopher Wellons <=