https://git.ruby-lang.org/ruby.git/commit/?id=9552262bb2

From 9552262bb2e293efa6e8f535d68623f2ecd13360 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Tue, 28 Jan 2020 15:21:26 +0900
Subject: support multi-run for test/ruby/test_struct.rb

Remove Structs to avoid redefinition warnings.

diff --git a/test/ruby/test_struct.rb b/test/ruby/test_struct.rb
index a7deb13..5f073a3 100644
--- a/test/ruby/test_struct.rb
+++ b/test/ruby/test_struct.rb
@@ -23,6 +23,10 @@ module TestStruct https://github.com/ruby/ruby/blob/trunk/test/ruby/test_struct.rb#L23
 
     test.bar = 47
     assert_equal(47, test.bar)
+
+    @Struct.class_eval do
+      remove_const :Test
+    end
   end
 
   # [ruby-dev:26247] more than 10 struct members causes segmentation fault
@@ -325,15 +329,19 @@ module TestStruct https://github.com/ruby/ruby/blob/trunk/test/ruby/test_struct.rb#L329
   end
 
   def test_redefinition_warning
-    @Struct.new("RedefinitionWarning")
+    @Struct.new(name = "RedefinitionWarning")
     e = EnvUtil.verbose_warning do
       @Struct.new("RedefinitionWarning")
     end
     assert_match(/redefining constant #@Struct::RedefinitionWarning/, e)
+
+    @Struct.class_eval do
+      remove_const name
+    end
   end
 
   def test_nonascii
-    struct_test = @Struct.new("R\u{e9}sum\u{e9}", :"r\u{e9}sum\u{e9}")
+    struct_test = @Struct.new(name = "R\u{e9}sum\u{e9}", :"r\u{e9}sum\u{e9}")
     assert_equal(@Struct.const_get("R\u{e9}sum\u{e9}"), struct_test, '[ruby-core:24849]')
     a = struct_test.new(42)
     assert_equal("#<struct #@Struct::R\u{e9}sum\u{e9} r\u{e9}sum\u{e9}=42>", a.inspect, '[ruby-core:24849]')
@@ -343,6 +351,10 @@ module TestStruct https://github.com/ruby/ruby/blob/trunk/test/ruby/test_struct.rb#L351
     assert_nothing_raised(Encoding::CompatibilityError) do
       assert_match(/redefining constant #@Struct::R\u{e9}sum\u{e9}/, e)
     end
+
+    @Struct.class_eval do
+      remove_const name
+    end
   end
 
   def test_junk
-- 
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