gedit crashed with SIGABRT in raise()

[Curtis Hovey]

Gedit crashed during snippet completion. I see this on the console:

TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
**
ERROR:/build/buildd/pygobject-3.0.3/gi/_gobject/pygobject.c:929:pygobject_new_full: assertion failed: (tp != NULL)

Snippets is obvious issue here because it is gedit python plugin. I would not discount another plugin though. I used the GDP Bazaar plugin a few minutes before.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: gedit 3.3.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-9.16-generic 3.2.1
Uname: Linux 3.2.0-9-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 1.90-0ubuntu2
Architecture: amd64
CrashCounter: 1
Date: Tue Jan 17 16:46:11 2012
ExecutablePath: /usr/bin/gedit
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcCmdline: gedit _notes.txt
Signal: 6
SourcePackage: gedit
StacktraceTop:
 raise () from /lib/x86_64-linux-gnu/libc.so.6
 abort () from /lib/x86_64-linux-gnu/libc.so.6
 g_assertion_message () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_assertion_message_expr () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /usr/lib/python2.7/dist-packages/gi/_gobject/_gobject.so
Title: gedit crashed with SIGABRT in raise()
UpgradeStatus: Upgraded to precise on 2012-01-15 (2 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #917344, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

[Curtis Hovey (sinzui)]

I think the issue might really be in snippets. I see in plugins/snippets/singleton.py
class Singleton(type):