[Ironruby-core] include FileTest not working how I expect

[Josh Flanagan]

Can someone explain the different 'include' behavior outlined in this
code snippet:
http://gist.github.com/396623

Is this a known difference between MRI/IronRuby in how include works?
Or is it a matter of different namespace clashes happening in
IronRuby?

Can I make the code that works under MRI (calling unqualified exists?)
work in IronRuby?