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[ID 20000330.005] defined ${$n} broken in 5.6 when $n is a number

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From:
Graham Barr
Date:
March 30, 2000 01:30
Subject:
[ID 20000330.005] defined ${$n} broken in 5.6 when $n is a number
Message ID:
200003300928.KAA19913@chipper.localdomain

This is a bug report for perl from gbarr@chipper.localdomain,
generated with the help of perlbug 1.28 running under perl v5.6.0.


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

The following snippet shows the problem, with 5.005_03 it outputs

 a 3
 b 2
 c 1

but with 5.6 it outputs the first 'a' and then loops forever.

$str = "abc";
$|=1;
while($str =~ /(c)|(b)|(a)/g) {
  my $paren = 1;
  print "$+ ";
  $paren++ until defined ${$paren};
  print "$paren\n";
}

I know that in 5.6 I could use @- to do this, but I have this
structure in code that is already in use and needs to continue
to work with older versions of perl

Graham.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=high
---
Site configuration information for perl v5.6.0:

Configured by gbarr at Wed Mar 29 16:49:13 BST 2000.

Summary of my perl5 (revision 5.0 version 6 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.2.13, archname=i686-linux
    uname='linux chipper 2.2.13 #1 mon nov 8 15:37:25 cet 1999 i686 unknown '
    config_args='-des'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=undef d_sfio=undef uselargefiles=define 
    use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler:
    cc='cc', optimize='-O2', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
    cppflags='-fno-strict-aliasing -I/usr/local/include'
    ccflags ='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    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, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -lndbm -lgdbm -ldbm -ldb -ldl -lm -lc -lposix -lcrypt
    libc=, so=so, useshrplib=false, libperl=libperl.a
  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 v5.6.0:
    /home/value/perl
    /usr/local/lib/perl5/5.6.0/i686-linux
    /usr/local/lib/perl5/5.6.0
    /usr/local/lib/perl5/site_perl/5.6.0/i686-linux
    /usr/local/lib/perl5/site_perl/5.6.0
    /usr/local/lib/perl5/site_perl
    .

---
Environment for perl v5.6.0:
    HOME=/home/gbarr
    LANG=POSIX
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/gbarr/bin:/usr/local/bin:/usr/bin:/usr/X11R6/bin:/bin:/usr/games/bin:/usr/games:/opt/gnome/bin:/opt/kde/bin:.
    PERL5LIB=/home/value/perl
    PERL_BADLANG (unset)
    SHELL=/usr/bin/zsh

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