remove unnecessary :stag accessor
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56238 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
remove unnecessary :stag accessor
has already been available because it is defined in parent
Scanner class. [Fix GH-1445]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56238 b2dd03c8-39d4-4d8f-98ff-823fe69b080e