https://git.ruby-lang.org/ruby.git/commit/?id=155bc42727

From 155bc42727a1328b07502fcd1a7b789e2677a09d Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Thu, 11 Nov 2021 13:55:30 +0900
Subject: [ruby/getoptlong] fixup 5f57f47572502173e2e8880f83ef7b3e2659f974

https://github.com/ruby/getoptlong/commit/5683297853
---
 test/test_getoptlong.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/test_getoptlong.rb b/test/test_getoptlong.rb
index 2d496e635c4..0cd370b6c75 100644
--- a/test/test_getoptlong.rb
+++ b/test/test_getoptlong.rb
@@ -20,7 +20,7 @@ class TestGetoptLong < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_getoptlong.rb#L20
       actual_options << "#{opt}: #{arg}"
     end
     # Save remaining test ARGV and restore original ARGV.
-    actual_remaining_argv = ARGV
+    actual_remaining_argv = ARGV.dup
     ARGV.replace(argv_saved)
     # Assert.
     assert_equal(expected_remaining_argv, actual_remaining_argv, 'ARGV')
-- 
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