test_refinement.rb: using without eval
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56430 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_refinement.rb: using without eval
needs to eval, using works in a class block now.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56430 b2dd03c8-39d4-4d8f-98ff-823fe69b080e