https://git.ruby-lang.org/ruby.git/commit/?id=59a40feec2

From 59a40feec27790cbe07955eb00f1bc125c8d95e8 Mon Sep 17 00:00:00 2001
From: "S.H" <gamelinks007@g...>
Date: Fri, 7 Feb 2020 19:36:11 +0900
Subject: remove warning & support multi-run test for test/psych_test_yaml.rb
 (#2887)


diff --git a/test/psych/test_yaml.rb b/test/psych/test_yaml.rb
index 5fa759c..88787d3 100644
--- a/test/psych/test_yaml.rb
+++ b/test/psych/test_yaml.rb
@@ -1034,6 +1034,7 @@ EOY https://github.com/ruby/ruby/blob/trunk/test/psych/test_yaml.rb#L1034
     end
 
 	def test_ruby_struct
+		Struct.send(:remove_const, :MyBookStruct) if Struct.const_defined?(:MyBookStruct)
 		# Ruby structures
 		book_struct = Struct::new( "MyBookStruct", :author, :title, :year, :isbn )
 		assert_to_yaml(
-- 
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