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[perl #67694] List::Util attaching to the wrong $_ when used inside given/when construct
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From:
perlbug-followup
Date:
July 19, 2009 09:49
Subject:
[perl #67694] List::Util attaching to the wrong $_ when used inside given/when construct
Message ID:
rt-3.6.HEAD-2466-1248006345-1401.67694-75-0@perl.org
# New Ticket Created by vparseval@gmail.com
# Please include the string: [perl #67694]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=67694 >
This is a bug report for perl from vparseval@gmail.com,
generated with the help of perlbug 1.36 running under perl 5.10.0.
-----------------------------------------------------------------
[Please enter your report here]
Please behold the following:
#!/usr/bin/perl -l
use feature qw/switch/;
use List::Util qw/first/;
my $val = 1;
given ($val) {
# my $_
when (1) {
print +(first { $_ == 10 } 10 .. 15) ? 'works inside when'
: 'broken inside when';
}
}
print +(first { $_ == 10 } 10 .. 15) ? 'works outside when'
: 'broken outside when';
__END__
broken inside when
works outside when
Note that when commenting out the lexical declaration of $_, the code behaves
as expected.
At this point, I am not sure if the problem is in List::Util or the perl core.
List::MoreUtil uses does the same thing as List::Util when it comes to
assigning to $_ and dispatching the code-reference hence it's suffering from
the same malaise.
Cheers,
Tassilo
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=library
severity=low
---
Site configuration information for perl 5.10.0:
Configured by Debian Project at Sun May 3 21:49:06 UTC 2009.
Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
Platform:
osname=linux, osvers=2.6.18-xen-3.1-1-amd64, archname=x86_64-linux-gnu-thread-multi
uname='linux nautilus 2.6.18-xen-3.1-1-amd64 #1 smp fri oct 19 23:35:59 cest 2007 x86_64 gnulinux '
config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.10 -Darchlib=/usr/lib/perl/5.10 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.10.0 -Dsitearch=/usr/local/lib/perl/5.10.0 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib -Dlibperl=libperl.so.5.10.0 -Dd_dosuid -des'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=define, use64bitall=define, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O2 -g',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include'
ccversion='', gccversion='4.3.3', gccosandvers=''
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64
libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
perllibs=-ldl -lm -lpthread -lc -lcrypt
libc=/lib/libc-2.9.so, so=so, useshrplib=true, libperl=libperl.so.5.10.0
gnulibc_version='2.9'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -O2 -g -L/usr/local/lib'
Locally applied patches:
---
@INC for perl 5.10.0:
/etc/perl
/usr/local/lib/perl/5.10.0
/usr/local/share/perl/5.10.0
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.10
/usr/share/perl/5.10
/usr/local/lib/site_perl
.
---
Environment for perl 5.10.0:
HOME=/home/ethan
LANG=en_US.UTF-8
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/ethan/bin:/home/ethan/bin:/usr/local/bin:/usr/bin:/bin:/usr/games
PERL_BADLANG (unset)
SHELL=/bin/bash
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