please see the gist and the accompanied error log for more information on the programm and crash https://gist.github.com/robkuz/4757281
Which version of Rubinius are you running? And on which platform? I've tried with latest master here and that worked fine for me.
I can't replicate this either:
[14:13][jnh@Bucket]~/Dev/tmp/rbx_mongoid_test$ ruby -v mongoid_test.rb ; echo $?
rubinius 2.0.0.rc1 (1.9.3 1dd2e999 yyyy-mm-dd JI) [x86_64-apple-darwin12.2.1]
Could have been a broken version of rbx-head?
Can't be replicated, plausible alternative explanation, no activity in a month. Close?