https://git.ruby-lang.org/ruby.git/commit/?id=09e7a0c4a4

From 09e7a0c4a4fba18e3308e4f8cb4b8b5b52b41d20 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 23 Jun 2021 18:56:10 +0900
Subject: Dispose the global rubygems configuration wholely

---
 test/rdoc/test_rdoc_rubygems_hook.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/rdoc/test_rdoc_rubygems_hook.rb b/test/rdoc/test_rdoc_rubygems_hook.rb
index f5ed579..f5177e4 100644
--- a/test/rdoc/test_rdoc_rubygems_hook.rb
+++ b/test/rdoc/test_rdoc_rubygems_hook.rb
@@ -28,7 +28,7 @@ class TestRDocRubygemsHook < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/rdoc/test_rdoc_rubygems_hook.rb#L28
     ].map {|e| [e, ENV.delete(e)]}.to_h
     ENV["HOME"] = @tempdir
 
-    Gem.configuration[:rdoc] = nil
+    Gem.configuration = nil
 
     @a.instance_variable_set(:@doc_dir, File.join(@tempdir, "doc"))
     @a.instance_variable_set(:@gem_dir, File.join(@tempdir, "a-2"))
-- 
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