[perl #112152] Deleting stashes confuses Carp stacktraces

# New Ticket Created by  Jesse Luehrs 
# Please include the string:  [perl #112152]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=112152 >


This is a bug report for perl from doy@tozt.net,
generated with the help of perlbug 1.39 running under perl 5.14.2.


-----------------------------------------------------------------
[Please describe your issue here]

Carp assumes in several places that if caller() returns a valid result,
then it will include the package. This isn't true if that stash has
since been deleted (caller returns undef as the first result in that
case). The attached patch adds tests for this, and fixes it.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=library
    severity=low
    module=Carp
---
Site configuration information for perl 5.14.2:

Configured by doy at Mon Feb 13 22:57:52 CST 2012.

Summary of my perl5 (revision 5 version 14 subversion 2) configuration:
   
  Platform:
    osname=linux, osvers=3.2.5-1-arch, archname=x86_64-linux
    uname='linux xtahua 3.2.5-1-arch #1 smp preempt tue feb 7 08:34:36 cet 2012 x86_64 intel(r) core(tm) i7-2640m cpu @ 2.80ghz genuineintel gnulinux '
    config_args='-de -Dprefix=/home/doy/perl5/perlbrew/perls/perl-5.14.2'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.6.2 20120120 (prerelease)', 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 =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /lib/../lib /usr/lib/../lib /lib /usr/lib
    libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.15.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.15'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector'

Locally applied patches:
    

---
@INC for perl 5.14.2:
    /home/doy/perl5/local/
    /home/doy/perl5/perlbrew/perls/perl-5.14.2/lib/site_perl/5.14.2/x86_64-linux
    /home/doy/perl5/perlbrew/perls/perl-5.14.2/lib/site_perl/5.14.2
    /home/doy/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/x86_64-linux
    /home/doy/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2
    .

---
Environment for perl 5.14.2:
    HOME=/home/doy
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/doy/perl5/perlbrew/bin:/home/doy/perl5/perlbrew/perls/perl-5.14.2/bin:/home/doy/.bin/marathon:/home/doy/.bin/nethack:/home/doy/.bin:/usr/local/sbin:/usr/local/bin:/usr/lib/ccache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/bin/vendor_perl:/usr/bin/core_perl
    PERL5LIB=/home/doy/perl5/local/
    PERLBREW_BASHRC_VERSION=0.33
    PERLBREW_HOME=/home/doy/.perlbrew
    PERLBREW_MANPATH=/home/doy/perl5/perlbrew/perls/perl-5.14.2/man
    PERLBREW_PATH=/home/doy/perl5/perlbrew/bin:/home/doy/perl5/perlbrew/perls/perl-5.14.2/bin
    PERLBREW_PERL=perl-5.14.2
    PERLBREW_ROOT=/home/doy/perl5/perlbrew
    PERLBREW_VERSION=0.41
    PERL_BADLANG (unset)
    PERL_CPANM_OPT=-q --mirror file:///home/doy/perl5/minicpan/ --mirror http://mirrors.kernel.org/cpan/ --mirror http://search.cpan.org/CPAN --prompt
    SHELL=/bin/zsh

• [perl #112152] Deleting stashes confuses Carp stacktraces by Jesse Luehrs