https://git.ruby-lang.org/ruby.git/commit/?id=31ba817887

From 31ba81788729944705e9f666b52c5ca4990c311d Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Tue, 6 Apr 2021 16:02:24 +0900
Subject: Try to fix Leaked file descriptor

https://github.com/ruby/ruby/runs/2274767991?check_suite_focus=true#step:15:118
```
Leaked file descriptor: DRbTests::TestDRbTCP#test_immediate_close: 7 : #<TCPServer:fd 7, AF_INET, 0.0.0.0, 42451>
Leaked file descriptor: DRbTests::TestDRbTCP#test_immediate_close: 9 : #<IO:fd 9>
Leaked file descriptor: DRbTests::TestDRbTCP#test_immediate_close: 10 : #<IO:fd 10>
```
---
 test/drb/test_drb.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/drb/test_drb.rb b/test/drb/test_drb.rb
index 47b2966..1024618 100644
--- a/test/drb/test_drb.rb
+++ b/test/drb/test_drb.rb
@@ -342,7 +342,9 @@ class TestDRbTCP < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/drb/test_drb.rb#L342
     socket.close
     client = DRb::DRbTCPSocket.new(server.uri, socket)
     assert client
-    client.close
+  ensure
+    client&.close
+    socket&.close
     server.stop_service
     server.thread.join
     DRb::DRbConn.stop_pool
-- 
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