https://git.ruby-lang.org/ruby.git/commit/?id=3ee0ad9190

From 3ee0ad919034fbc098939979c872d041a82c4334 Mon Sep 17 00:00:00 2001
From: Marc-Andre Lafortune <github@m...>
Date: Mon, 21 Dec 2020 20:01:54 -0500
Subject: [ruby/psych] Don't use instance variables directly for config


diff --git a/ext/psych/lib/psych.rb b/ext/psych/lib/psych.rb
index 347160e..0b62362 100644
--- a/ext/psych/lib/psych.rb
+++ b/ext/psych/lib/psych.rb
@@ -595,28 +595,25 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych.rb#L595
   end
 
   # :stopdoc:
-  @domain_types = {}
   def self.add_domain_type domain, type_tag, &block
     key = ['tag', domain, type_tag].join ':'
-    @domain_types[key] = [key, block]
-    @domain_types["tag:#{type_tag}"] = [key, block]
+    domain_types[key] = [key, block]
+    domain_types["tag:#{type_tag}"] = [key, block]
   end
 
   def self.add_builtin_type type_tag, &block
     domain = 'yaml.org,2002'
     key = ['tag', domain, type_tag].join ':'
-    @domain_types[key] = [key, block]
+    domain_types[key] = [key, block]
   end
 
   def self.remove_type type_tag
-    @domain_types.delete type_tag
+    domain_types.delete type_tag
   end
 
-  @load_tags = {}
-  @dump_tags = {}
   def self.add_tag tag, klass
-    @load_tags[tag] = klass.name
-    @dump_tags[klass] = tag
+    load_tags[tag] = klass.name
+    dump_tags[klass] = tag
   end
 
   # Workaround for emulating `warn '...', uplevel: 1` in Ruby 2.4 or lower.
@@ -639,5 +636,8 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych.rb#L636
     attr_accessor :dump_tags
     attr_accessor :domain_types
   end
+  self.load_tags = {}
+  self.dump_tags = {}
+  self.domain_types = {}
   # :startdoc:
 end
-- 
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