merge revision(s) 5e018214e7435030727a97ac49db038d96438e74: [Backport #15720]
Fix SystemStackError when calling a method in an unused refinement Fixes [Bug #15720]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67729 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 5e018214e7435030727a97ac49db038d96438e74: [Backport #15720]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67729 b2dd03c8-39d4-4d8f-98ff-823fe69b080e