Description: after upgrading perl to perl 5.12.1 the perl plugin iset.pl for weechat causes weechat to crash. when i type 'weechat-curses' in urxvt i get the following message :

** Message: pygobject_register_sinkfunc is deprecated (GtkWindow)
** Message: pygobject_register_sinkfunc is deprecated (GtkInvisible)
** Message: pygobject_register_sinkfunc is deprecated (GtkObject)
Undefined subroutine &main::buffers_signal_buffer called

weechat won't even start up. i also had this message in core.weechat.log :

2010-08-03 12:11:16 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:16 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 python scripts loaded: hlpvitem, notify, urlbar, weeget
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_config_cb" must return one valid value (0)
2010-08-03 12:11:17 Plugins loaded: alias, aspell, charset, fifo, irc, logger, lua, perl, python, ruby, tcl, xfer
2010-08-03 12:11:17 =!= perl: function "iset_check_condition_isetbar_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_check_condition_isetbar_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_check_condition_isetbar_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_check_condition_isetbar_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_check_condition_isetbar_cb" must return one valid value (0)
2010-08-03 12:11:17 =!= perl: function "iset_item_cb" must return one valid value (0)
2010-08-03 12:11:17 perl error: Undefined subroutine &main::buffers_signal_buffer called.

i'm using arch 64 bit, and openbox. i posted a bug upstream with weechat here - https://savannah.nongnu.org/bugs/index.php?30637 - and also spoke to a dev in their irc channel. they assured me that there was no problem with weechat or the code of iset.pl, and they suspect that the perl package is the culprit. i was also asked to report the bug here. not sure what other info to give and sorry if my report isn't too great, i'm kinda new at this. i've also attached a copy of iset.pl in case thats any help to you.


Additional info:
* package version(s) - perl 5.12.1, weechat 0.3.2-1, iset.pl 0.9
* config and/or log files etc. - attached iset.pl


Steps to reproduce:
started weechat without the script, it started ok. started with the script again and it wouldn't run, giving the same error message. did this a number of times. also tried loading the script as weechat was running scriptless which resulted in the same error message