https://git.ruby-lang.org/ruby.git/commit/?id=60b57866ac

From 60b57866ac64ef8a21951c7d5ff7b7f98e1ce15f Mon Sep 17 00:00:00 2001
From: Masataka Pocke Kuwabara <p.ck.t22@g...>
Date: Tue, 24 Nov 2020 00:37:13 +0900
Subject: [ruby/mutex_m] Fix `Mutex_m#initialize` when the super's initialize
 has kwargs

Co-authored-by: Ryuta Kamizono <kamipo@g...>

https://github.com/ruby/mutex_m/commit/84ca1fc108

diff --git a/lib/mutex_m.rb b/lib/mutex_m.rb
index dd47934..07f5a9a 100644
--- a/lib/mutex_m.rb
+++ b/lib/mutex_m.rb
@@ -113,4 +113,5 @@ module Mutex_m https://github.com/ruby/ruby/blob/trunk/lib/mutex_m.rb#L113
     mu_initialize
     super
   end
+  ruby2_keywords(:initialize) if respond_to?(:ruby2_keywords, true)
 end
diff --git a/test/test_mutex_m.rb b/test/test_mutex_m.rb
index 30971dd..e5cfbc8 100644
--- a/test/test_mutex_m.rb
+++ b/test/test_mutex_m.rb
@@ -23,4 +23,36 @@ class TestMutexM < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_mutex_m.rb#L23
     c.signal
     assert_equal "abc", t.value
   end
+
+  class KeywordInitializeParent
+    def initialize(x:)
+    end
+  end
+
+  class KeywordInitializeChild < KeywordInitializeParent
+    include Mutex_m
+    def initialize
+      super(x: 1)
+    end
+  end
+
+  def test_initialize_with_keyword_arg
+    assert KeywordInitializeChild.new
+  end
+
+  class NoArgInitializeParent
+    def initialize
+    end
+  end
+
+  class NoArgInitializeChild < NoArgInitializeParent
+    include Mutex_m
+    def initialize
+      super()
+    end
+  end
+
+  def test_initialize_no_args
+    assert NoArgInitializeChild.new
+  end
 end
-- 
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