https://git.ruby-lang.org/ruby.git/commit/?id=8d2333019a

From 8d2333019abb1f8ad882dadf9096f81e9f427c6e Mon Sep 17 00:00:00 2001
From: Masataka Pocke Kuwabara <kuwabara@p...>
Date: Sat, 11 Jul 2020 16:01:05 +0900
Subject: Fix MonitorMixin when the super's initialize has kwargs


diff --git a/ext/monitor/lib/monitor.rb b/ext/monitor/lib/monitor.rb
index 63a54fe..08a3a31 100644
--- a/ext/monitor/lib/monitor.rb
+++ b/ext/monitor/lib/monitor.rb
@@ -220,7 +220,7 @@ module MonitorMixin https://github.com/ruby/ruby/blob/trunk/ext/monitor/lib/monitor.rb#L220
   # Use <tt>extend MonitorMixin</tt> or <tt>include MonitorMixin</tt> instead
   # of this constructor.  Have look at the examples above to understand how to
   # use this module.
-  def initialize(*args)
+  def initialize(...)
     super
     mon_initialize
   end
diff --git a/test/monitor/test_monitor.rb b/test/monitor/test_monitor.rb
index 721c848..734b639 100644
--- a/test/monitor/test_monitor.rb
+++ b/test/monitor/test_monitor.rb
@@ -236,6 +236,22 @@ class TestMonitor < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/monitor/test_monitor.rb#L236
     assert NewCondTest.new.cond.instance_variable_get(:@monitor) != nil
   end
 
+  class KeywordInitializeParent
+    def initialize(x:)
+    end
+  end
+
+  class KeywordInitializeChild < KeywordInitializeParent
+    include MonitorMixin
+    def initialize
+      super(x: 1)
+    end
+  end
+
+  def test_initialize_with_keyword_arg
+    assert KeywordInitializeChild.new
+  end
+
   def test_timedwait
     cond = @monitor.new_cond
     b = "foo"
-- 
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