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[perl #41716] "die" and "warn" while looping over array slices

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From:
perlbug @ der-pepe . de
Date:
March 6, 2007 14:26
Subject:
[perl #41716] "die" and "warn" while looping over array slices
Message ID:
rt-3.6.HEAD-2051-1173216244-272.41716-75-0@perl.org
# New Ticket Created by  perlbug@der-pepe.de 
# Please include the string:  [perl #41716]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=41716 >


This is a bug report for perl from perlbug@der-pepe.de,
generated with the help of perlbug 1.35 running under perl v5.8.7.


-----------------------------------------------------------------

This script results in a strange error on perl 5.8.8 built for i686-linux.

#!/usr/bin/perl
use strict;
use warnings;

my @examples = (
    {
	name => 'Test Eins',
    },
    {
	name => 'Test Zwei',
    },
);

my @do_examples = (0, 1);

for my $foo (@examples[@do_examples]) {
    my $testname = $foo->{name};         # line 17
    print "$testname...\n";
    local $@;
    eval {
	die 'hallo';
	17;
    } or do {
	warn;
    };
}

The output is:

Test Eins...
hallo at /tmp/test.pl line 21.
        ...caught at /tmp/test.pl line 24.
Can't use string ("1") as a HASH ref while "strict refs" in use at /tmp/test.pl line 17.

Apparently, $foo is set to 1, though it is never written to.

The error will disappear if you
* don't use an array slice but the whole array in the for loop
* remove warn or die
* give an argument to warn.

This couldn't be reproduced on perl 5.8.5.

-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl v5.8.7:

Configured by Gentoo at Sat Nov 12 16:50:54 CET 2005.

Summary of my perl5 (revision 5 version 8 subversion 7) configuration:
  Platform:
    osname=linux, osvers=2.6.13.1, archname=i686-linux
    uname='linux opaque 2.6.13.1 #2 sat sep 17 03:21:53 cest 2005 i686 amd-k7(tm) processor authenticamd gnulinux '
    config_args='-des -Darchname=i686-linux -Dcccdlflags=-fPIC -Dccdlflags=-rdynamic -Dcc=i686-pc-linux-gnu-gcc -Dprefix=/usr -Dvendorprefix=/usr -Dsiteprefix=/usr -Dlocincpth=  -Doptimize=-O3 -fomit-frame-pointer -march=i686 -pipe -Duselargefiles -Dd_semctl_semun -Dscriptdir=/usr/bin -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dinstallman1dir=/var/tmp/portage/perl-5.8.7-r1/image//usr/share/man/man1 -Dinstallman3dir=/var/tmp/portage/perl-5.8.7-r1/image//usr/share/man/man3 -Dman1ext=1 -Dman3ext=3pm -Dinc_version_list=5.8.0 5.8.0/i686-linux 5.8.2 5.8.2/i686-linux 5.8.4 5.8.4/i686-linux 5.8.5 5.8.5/i686-linux 5.8.6 5.8.6/i686-linux  -Dcf_by=Gentoo -Ud_csh -Di_ndbm -Di_gdbm -Di_db'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='i686-pc-linux-gnu-gcc', ccflags ='-fno-strict-aliasing -pipe -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O3 -fomit-frame-pointer -march=i686 -pipe',
    cppflags='-fno-strict-aliasing -pipe'
    ccversion='', gccversion='3.4.3-20050110 (Gentoo Linux 3.4.3.20050110, ssp-3.4.3.20050110-0, pie-8.7.7)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='i686-pc-linux-gnu-gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lpthread -lnsl -lndbm -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.3.4.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.3.4'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.8.7:
    /etc/perl
    /usr/lib/perl5/site_perl/5.8.7/i686-linux
    /usr/lib/perl5/site_perl/5.8.7
    /usr/lib/perl5/site_perl/5.8.2
    /usr/lib/perl5/site_perl/5.8.4
    /usr/lib/perl5/site_perl
    /usr/lib/perl5/vendor_perl/5.8.7/i686-linux
    /usr/lib/perl5/vendor_perl/5.8.7
    /usr/lib/perl5/vendor_perl/5.8.2
    /usr/lib/perl5/vendor_perl/5.8.4
    /usr/lib/perl5/vendor_perl
    /usr/lib/perl5/5.8.7/i686-linux
    /usr/lib/perl5/5.8.7
    /usr/local/lib/site_perl
    .

---
Environment for perl v5.8.7:
    HOME=/home/pepe
    LANG (unset)
    LANGUAGE (unset)
    LC_ALL=en_US.ISO8859-1
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/pepe/.bin:/bin:/usr/bin:/opt/bin:/usr/i686-pc-linux-gnu/gcc-bin/3.4.3-20050110:/opt/ghc/bin:/opt/blackdown-jdk-1.4.1/bin:/opt/blackdown-jdk-1.4.1/jre/bin:/usr/qt/3/bin:/usr/kde/3.4/bin:/usr/kde/3.2/bin:/usr/games/bin:/var/qmail/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash


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