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[perl #41717] use diagnostics and localization

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From:
perl-5 . 8 . 0 @ ton . iguana . be
Date:
March 6, 2007 21:00
Subject:
[perl #41717] use diagnostics and localization
Message ID:
rt-3.6.HEAD-2051-1173218687-172.41717-75-0@perl.org
# New Ticket Created by  perl-5.8.0@ton.iguana.be 
# Please include the string:  [perl #41717]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=41717 >



This is a bug report for perl from perl-5.8.0@ton.iguana.be,
generated with the help of perlbug 1.35 running under perl 5.8.4.


-----------------------------------------------------------------
[Please enter your report here]


perl -le '$_="abc"; while(/./g) { print$a,$& }'
a
b
c

perl -le 'use diagnostics; $_="abc"; while(/./g) { print$a,$& }'
a
a
a
....

oops, infinite loop
The reason is that use diagnostics localizes $_ for the diagnostics output,
but that looses pos on $_

Easy enough to fix by going to diagnostics.pm and in sub splainthis
replace the 

local $_ = shift 

by a better localization, e.g.

for (shift) {
   ... the rest of splainthis comes here...
}

(should work better in case of ties too, irrespective of the pos issue)

But...shouldn't localization of $_ just localize the pos too ?

Somewhat simular:

perl -le '$!=21; 1+$a;  print $!' 2>/dev/full
Is a directory

perl -le 'use diagnostics; $!=21; 1+$a;  print $!' 2>/dev/full
No space left on device

So use diagnostics loses $! too. I think sub splainthis should also get a 
  local $!

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
This perlbug was built using Perl v5.9.3 - Sun Jan 15 17:58:22 CET 2006
It is being executed now by  Perl 5.8.4 - Thu Jun  3 13:28:19 CEST 2004.

Site configuration information for perl 5.8.4:

Configured by ton at Thu Jun  3 13:28:19 CEST 2004.

Summary of my perl5 (revision 5 version 8 subversion 4) configuration:
  Platform:
    osname=linux, osvers=2.6.5, archname=i686-linux-64int-ld
    uname='linux quasar 2.6.5 #8 mon apr 5 05:41:20 cest 2004 i686 gnulinux '
    config_args=''
    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=define use64bitall=undef uselongdouble=define
    usemymalloc=y, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2 -fomit-frame-pointer',
    cppflags='-fno-strict-aliasing -I/usr/local/include'
    ccversion='', gccversion='3.4.0 20031231 (experimental)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long long', ivsize=8, nvtype='long double', nvsize=12, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.3.2.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.3.2'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl 5.8.4:
    /usr/lib/perl5/5.8.4/i686-linux-64int-ld
    /usr/lib/perl5/5.8.4
    /usr/lib/perl5/site_perl/5.8.4/i686-linux-64int-ld
    /usr/lib/perl5/site_perl/5.8.4
    /usr/lib/perl5/site_perl
    .

---
Environment for perl 5.8.4:
    HOME=/home/ton
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/ton/bin.Linux:/home/ton/bin:/home/ton/bin.SampleSetup:/usr/local/bin:/usr/local/sbin:/home/oracle/product/9.2/bin:/usr/local/ar/bin:/usr/games/bin:/usr/X11R6/bin:/usr/share/bin:/usr/bin:/usr/sbin:/bin:/sbin:.
    PERL_BADLANG (unset)
    SHELL=/bin/bash


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