Using $variable.any_method in a merb-part view results in this:

undefined method `each_with_index' for #
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core/dispatch/exceptions.html.erb:197:in `__var__lib__gems__1_8__gems__merb__core__0_9_1__lib__merb__core__dispatch__exceptions_html_erb'
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core/dispatch/dispatcher.rb:190:in `send'
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core/dispatch/dispatcher.rb:190:in `dispatch_default_exception'
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core/dispatch/dispatcher.rb:154:in `dispatch_exception'
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core/dispatch/dispatcher.rb:76:in `handle'
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core/rack/application.rb:37:in `call'
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core/rack/handler/mongrel.rb:72:in `process'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:159:in `process_client'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:158:in `each'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:158:in `process_client'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:285:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:285:in `initialize'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:285:in `new'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:285:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:268:in `initialize'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:268:in `new'
/var/lib/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:268:in `run'
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core/rack/adapter/mongrel.rb:21:in `start'
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core/server.rb:43:in `start'
/var/lib/gems/1.8/gems/merb-core-0.9.1/lib/merb-core.rb:33:in `start'
/var/lib/gems/1.8/gems/merb-core-0.9.1/bin/merb:8
/var/lib/gems/1.8/bin/merb:16:in `load'
/var/lib/gems/1.8/bin/merb:16