Fixed enumerator_class spec.
Fixed enumerator_class spec.

elia/mspec,ruby/mspec,rdp/mspec,voxik/mspec,eregon/mspec,rubinius/mspec,opal/mspec,ruby/mspec,kachick/mspec,ryoqun/mspec,iainbeeston/mspec,iainbeeston/mspec,kachick/mspec,nobu/mspec,shirosaki/mspec,Zoxc/mspec,MagLev/mspec,shugo/mspec,opal/mspec,mkb/mspec,timfel/mspec,ryoqun/mspec,MagLev/mspec,alex/mspec,Gibheer/mspec