def set_visibility_for(methods, vis, singleton = false)
      methods_matching methods, singleton do |m|
        m.visibility = vis
      end
    end
def set_visibility_for(methods, vis, singleton = false)
      methods_matching methods, singleton do |m|
        m.visibility = vis
      end
    end
Given an array +methods+ of method names, set the visibility of the
 corresponding AnyMethod object