https://git.ruby-lang.org/ruby.git/commit/?id=9bcf4f3db2

From 9bcf4f3db26249772c983896ebbc9ff41f4614db Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 21 Jan 2020 11:47:04 +0900
Subject: delegate.rb: fixed keyword arguments in DelegateClass

`Delegator.delegating_block` should delegate keyword arguments
separately.  [ruby-core:96949]

diff --git a/lib/delegate.rb b/lib/delegate.rb
index 0bbe211..b7d48ef 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -334,7 +334,7 @@ def Delegator.delegating_block(mid) # :nodoc: https://github.com/ruby/ruby/blob/trunk/lib/delegate.rb#L334
   lambda do |*args, &block|
     target = self.__getobj__
     target.__send__(mid, *args, &block)
-  end
+  end.ruby2_keywords
 end
 
 #
diff --git a/test/test_delegate.rb b/test/test_delegate.rb
index 80bf416..9c47743 100644
--- a/test/test_delegate.rb
+++ b/test/test_delegate.rb
@@ -343,4 +343,12 @@ class TestDelegateClass < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_delegate.rb#L343
     assert_equal(1, delegate.bar)
     assert_raise(NoMethodError, /undefined method `foo' for/) { delegate.foo }
   end
+
+  def test_keyword_argument
+    k = EnvUtil.labeled_class("Target") do
+      def test(a, k:) [a, k]; end
+    end
+    a = DelegateClass(k).new(k.new)
+    assert_equal([1, 0], a.test(1, k: 0))
+  end
 end
-- 
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