https://git.ruby-lang.org/ruby.git/commit/?id=f625a4be3c

From f625a4be3c8f159e97f859785d95d50550b3edca Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Thu, 10 Oct 2019 11:33:44 +0900
Subject: [ruby/forwardable] Fix NoMethodError on ruby 2.4 or earlier

https://github.com/ruby/forwardable/runs/242918994#step:5:12
```
Error: test_obj_single_delegators_send_id(TestForwardable): NoMethodError: private method `attr_reader' called for #<Class:#<Object:0x00005605af501f58>>
```

https://github.com/ruby/forwardable/commit/711bbb2466

diff --git a/test/test_forwardable.rb b/test/test_forwardable.rb
index 2c91d6f..2c0face 100644
--- a/test/test_forwardable.rb
+++ b/test/test_forwardable.rb
@@ -230,7 +230,7 @@ class TestForwardable < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_forwardable.rb#L230
   def test_obj_single_delegators_send_id
     %i[def_delegators def_single_delegators].each do |m|
       obj = single_forwardable_object do
-        singleton_class.attr_reader :receiver
+        singleton_class.__send__ :attr_reader, :receiver
         __send__ m, :@receiver, :__send__, :__id__
       end
 
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