https://git.ruby-lang.org/ruby.git/commit/?id=83fabfccf5

From 83fabfccf5d45312325bab83de2cf62ea54fa020 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@h...>
Date: Thu, 10 Mar 2022 12:19:40 -0800
Subject: Add test for protected methods on module included

---
 test/ruby/test_module.rb | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index e744121718..6bbe168348 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -756,6 +756,25 @@ class TestModule < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_module.rb#L756
     assert_equal([:m1, :m0, :m, :sc, :m1, :m0, :c], sc.new.m)
   end
 
+  def test_protected_include_into_included_module
+    m1 = Module.new do
+      def other_foo(other)
+        other.foo
+      end
+
+      protected
+      def foo
+        :ok
+      end
+    end
+    m2 = Module.new
+    c1 = Class.new { include m2 }
+    c2 = Class.new { include m2 }
+    m2.include(m1)
+
+    assert_equal :ok, c1.new.other_foo(c2.new)
+  end
+
   def test_instance_methods
     assert_equal([:user, :user2], User.instance_methods(false).sort)
     assert_equal([:user, :user2, :mixin].sort, User.instance_methods(true).sort)
-- 
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