https://git.ruby-lang.org/ruby.git/commit/?id=98bf8c83fa

From 98bf8c83fa4d5d36544a3d7a335a759de6529ab6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 28 Jun 2022 15:40:32 +0900
Subject: [ruby/rdoc] Refinement is added since ruby 3.1

https://github.com/ruby/rdoc/commit/c051eb90d1
---
 lib/rdoc/known_classes.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/rdoc/known_classes.rb b/lib/rdoc/known_classes.rb
index 4d7f4aa995..3cccff623f 100644
--- a/lib/rdoc/known_classes.rb
+++ b/lib/rdoc/known_classes.rb
@@ -25,6 +25,7 @@ module RDoc https://github.com/ruby/ruby/blob/trunk/lib/rdoc/known_classes.rb#L25
     "rb_cObject"           => "Object",
     "rb_cProc"             => "Proc",
     "rb_cRange"            => "Range",
+    "rb_cRefinement"       => "Refinement",
     "rb_cRegexp"           => "Regexp",
     "rb_cRubyVM"           => "RubyVM",
     "rb_cSocket"           => "Socket",
-- 
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