[ruby/singleton] Make compatible with Ruby 2.4

https://github.com/ruby/singleton/commit/0a77bb492d
2021-11-08 13:59:38 -05:00 · 2021-11-08 13:59:38 -05:00 · 0f00544984
commit 0f00544984
parent 2f53c9fc62
1 changed files with 1 additions and 1 deletions
--- a/lib/singleton.rb
+++ b/lib/singleton.rb
@ -156,7 +156,7 @@ module Singleton

    def self.extended(c)
      # extending an object with Singleton is a bad idea
-      c.singleton_class.undef_method :extend_object
+      c.singleton_class.send(:undef_method, :extend_object)
    end

    def __init__(klass) # :nodoc: