fix the number of intro lines r44123

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45244 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Use assert_separately to speed up

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45245 b2dd03c8-39d4-4d8f-98ff-823fe69b080e