https://git.ruby-lang.org/ruby.git/commit/?id=0aa267f985

From 0aa267f985084e69c3e45cc3e94698eaacab5c36 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Wed, 25 Sep 2019 11:02:40 -0700
Subject: Fix keyword argument sepration issues when IO#open calls #to_open


diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index a610b60..280d11f 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2279,6 +2279,19 @@ class TestIO < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_io.rb#L2279
     assert_equal(o, o2)
   end
 
+  def test_open_redirect_keyword
+    o = Object.new
+    def o.to_open(**kw); kw; end
+    assert_equal({:a=>1}, open(o, a: 1))
+    assert_warn(/The last argument is used as the keyword parameter.*for `to_open'/m) do
+      assert_equal({:a=>1}, open(o, {a: 1}))
+    end
+
+    def o.to_open(kw); kw; end
+    assert_equal({:a=>1}, open(o, a: 1))
+    assert_equal({:a=>1}, open(o, {a: 1}))
+  end
+
   def test_open_pipe
     open("|" + EnvUtil.rubybin, "r+") do |f|
       f.puts "puts 'foo'"
-- 
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