https://git.ruby-lang.org/ruby.git/commit/?id=46173eeb64

From 46173eeb64245ff533dafddd3d74338763c0bb35 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Wed, 29 Jan 2020 13:07:56 +0900
Subject: support multi-run for test/ruby/enc/test_regex_casefold.rb

should not mutate test data.

diff --git a/test/ruby/enc/test_regex_casefold.rb b/test/ruby/enc/test_regex_casefold.rb
index 2b252bd..ec5dc7f 100644
--- a/test/ruby/enc/test_regex_casefold.rb
+++ b/test/ruby/enc/test_regex_casefold.rb
@@ -11,7 +11,7 @@ class TestCaseFold < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/enc/test_regex_casefold.rb#L11
 
   def check_downcase_properties(expected, start, *flags)
     assert_equal expected, start.downcase(*flags)
-    temp = start
+    temp = start.dup
     assert_equal expected, temp.downcase!(*flags)
     assert_equal expected, expected.downcase(*flags)
     temp = expected
-- 
cgit v0.10.2


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