Ruby

vm_method.c: NameError at refined method alias

• vm_method.c (rb_alias): raise a NameError when creating alias to
  a refined method if the original method of the refined method is
  not defined. [ruby-core:67523] [Bug #10731]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49221 b2dd03c8-39d4-4d8f-98ff-823fe69b080e