https://git.ruby-lang.org/ruby.git/commit/?id=155cd7fd2a

From 155cd7fd2a4d5d3a732f73d42385048e16dfbc23 Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@g...>
Date: Sat, 30 Jan 2021 13:43:50 +0100
Subject: [ruby/psych] Cache dispatch cache in an instance variable

https://github.com/ruby/psych/commit/285c461cd2
---
 ext/psych/lib/psych/visitors/visitor.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/psych/lib/psych/visitors/visitor.rb b/ext/psych/lib/psych/visitors/visitor.rb
index e2585c0..21052aa 100644
--- a/ext/psych/lib/psych/visitors/visitor.rb
+++ b/ext/psych/lib/psych/visitors/visitor.rb
@@ -17,7 +17,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/visitor.rb#L17
 
       if defined?(Ractor)
         def dispatch
-          Ractor.current[:Psych_Visitors_Visitor] ||= Visitor.dispatch_cache
+          @dispatch_cache ||= (Ractor.current[:Psych_Visitors_Visitor] ||= Visitor.dispatch_cache)
         end
       else
         DISPATCH = dispatch_cache
-- 
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