https://git.ruby-lang.org/ruby.git/commit/?id=dfa67db62b

From dfa67db62bbffd9f6900b46aa04309ea77acf673 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 27 Sep 2021 16:01:53 +0900
Subject: Show failed environment variables

---
 test/ruby/test_m17n.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index 3f28d55..6b0bc4d 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -1331,8 +1331,8 @@ class TestM17N < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_m17n.rb#L1331
       env_encoding = Encoding.find("locale")
     end
     ENV.each {|k, v|
-      assert_equal(env_encoding, k.encoding, k)
-      assert_equal(env_encoding, v.encoding, v)
+      assert_equal(env_encoding, k.encoding, proc {"key(#{k.encoding})=#{k.dump}"})
+      assert_equal(env_encoding, v.encoding, proc {"key(#{k.encoding})=#{k.dump}\n" "value(#{v.encoding})=#{v.dump}"})
     }
   end
 
-- 
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