A similar issue has been reported. It's a weird bug with ruby
1.9. When you include RSpec::Matchers in an example group, it
makes `super` recurse infinitely.
The solution, for now, is to not include RSpec::Matchers in an example
group. You shouldn't need to, anyway; RSpec takes care of including
it for you. I'm working on a fix to work around the bug in 1.9.
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