From @cpansprout

See this code that I added to t/mro/package_aliases.t, specifically the first comment​:

no warnings; # temporary; there seems to be a scoping bug, as this does not
  # work when placed in the blocks below

# Test that deleting stash elements containing
# subpackages also invalidates the isa cache.
# Maybe this does not belong in package_aliases.t, but it is closely
# related to the tests immediately preceding.
{
@​Pet​::ISA = ("Cur", "Hound");
@​Cur​::ISA = "Hylactete";

sub Hylactete​::speak { "Arff!" }
sub Hound​::speak { "Woof!" }

my $pet = bless [], "Pet";

my $life_raft = delete $​::{'Cur​::'};

is $pet->speak, 'Woof!',
  'deleting a stash from its parent stash invalidates the isa caches';

undef $life_raft;
is $pet->speak, 'Woof!',
  'the deleted stash is gone completely when freed';
}

Flags​:
  category=core
  severity=low

Site configuration information for perl 5.13.6​:

Configured by sprout at Thu Nov 11 04​:29​:30 PST 2010.

Summary of my perl5 (revision 5 version 13 subversion 6) configuration​:
  Commit id​: fc6b470
  Platform​:
  osname=darwin, osvers=10.4.0, archname=darwin-2level
  uname='darwin pint.local 10.4.0 darwin kernel version 10.4.0​: fri apr 23 18​:28​:53 pdt 2010; root​:xnu-1504.7.4~1release_i386 i386 '
  config_args='-de -Dusedevel -Doptimize=-Os -Dusemymalloc=y -Duseshrplib=true -Duselargefiles=yes -Duseposix=true -Dhint-recommended =Duseperlio=yes -Duse64bitint=yes'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=undef, usemultiplicity=undef
  useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
  use64bitint=undef, use64bitall=undef, uselongdouble=undef
  usemymalloc=y, bincompat5005=undef
  Compiler​:
  cc='cc', ccflags ='-fno-common -DPERL_DARWIN -no-cpp-precomp -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include',
  optimize='-Os',
  cppflags='-no-cpp-precomp -fno-common -DPERL_DARWIN -no-cpp-precomp -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
  ccversion='', gccversion='4.2.1 (Apple Inc. build 5664)', gccosandvers=''
  intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
  ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
  alignbytes=8, prototype=define
  Linker and Libraries​:
  ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags =' -fstack-protector -L/usr/local/lib'
  libpth=/usr/local/lib /usr/lib
  libs=-ldbm -ldl -lm -lutil -lc
  perllibs=-ldl -lm -lutil -lc
  libc=/usr/lib/libc.dylib, so=dylib, useshrplib=true, libperl=libperl.dylib
  gnulibc_version=''
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
  cccdlflags=' ', lddlflags=' -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector'

Locally applied patches​:
 

@​INC for perl 5.13.6​:
  /usr/local/lib/perl5/site_perl/5.13.6/darwin-2level
  /usr/local/lib/perl5/site_perl/5.13.6
  /usr/local/lib/perl5/5.13.6/darwin-2level
  /usr/local/lib/perl5/5.13.6
  /usr/local/lib/perl5/site_perl
  .

Environment for perl 5.13.6​:
  DYLD_LIBRARY_PATH (unset)
  HOME=/Users/sprout
  LANG=en_US.UTF-8
  LANGUAGE (unset)
  LD_LIBRARY_PATH (unset)
  LOGDIR (unset)
  PATH=/usr/bin​:/bin​:/usr/sbin​:/sbin​:/usr/local/bin​:/usr/X11/bin​:/usr/local/bin
  PERL_BADLANG (unset)
  SHELL=/bin/bash

From @jkeenan

On Sun Nov 14 13​:46​:38 2010, sprout wrote​:

See this code that I added to t/mro/package_aliases.t, specifically
the first comment​:

no warnings; # temporary; there seems to be a scoping bug, as this
does not
# work when placed in the blocks below

The attached confirms this bug and demonstrates that, since it occurs
with Test​::More, it is independent of the use of ./t/test.pl in core.

From @jkeenan

bigdog.pl

The RT System itself - Status changed from 'new' to 'open'