https://git.ruby-lang.org/ruby.git/commit/?id=3ab41acd36

From 3ab41acd3617319588a0010657d0adf1caf74d24 Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@g...>
Date: Sat, 30 Jan 2021 13:41:12 +0100
Subject: [ruby/psych] Cache access to Psych.load_tags in Visitor::ToRuby

https://github.com/ruby/psych/commit/58223f0426
---
 ext/psych/lib/psych/visitors/to_ruby.rb | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/ext/psych/lib/psych/visitors/to_ruby.rb b/ext/psych/lib/psych/visitors/to_ruby.rb
index ec80701..a100188 100644
--- a/ext/psych/lib/psych/visitors/to_ruby.rb
+++ b/ext/psych/lib/psych/visitors/to_ruby.rb
@@ -24,6 +24,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/to_ruby.rb#L24
         super()
         @st = {}
         @ss = ss
+        @load_tags = Psych.load_tags
         @domain_types = Psych.domain_types
         @class_loader = class_loader
         @symbolize_names = symbolize_names
@@ -48,7 +49,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/to_ruby.rb#L49
       end
 
       def deserialize o
-        if klass = resolve_class(Psych.load_tags[o.tag])
+        if klass = resolve_class(@load_tags[o.tag])
           instance = klass.allocate
 
           if instance.respond_to?(:init_with)
@@ -128,7 +129,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/to_ruby.rb#L129
       end
 
       def visit_Psych_Nodes_Sequence o
-        if klass = resolve_class(Psych.load_tags[o.tag])
+        if klass = resolve_class(@load_tags[o.tag])
           instance = klass.allocate
 
           if instance.respond_to?(:init_with)
@@ -160,8 +161,8 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/to_ruby.rb#L161
       end
 
       def visit_Psych_Nodes_Mapping o
-        if Psych.load_tags[o.tag]
-          return revive(resolve_class(Psych.load_tags[o.tag]), o)
+        if @load_tags[o.tag]
+          return revive(resolve_class(@load_tags[o.tag]), o)
         end
         return revive_hash(register(o, {}), o) unless o.tag
 
@@ -326,6 +327,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/to_ruby.rb#L327
       end
 
       private
+
       def register node, object
         @st[node.anchor] = object if node.anchor
         object
-- 
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