https://git.ruby-lang.org/ruby.git/commit/?id=b2fe7484e7

From b2fe7484e7e7c7741f33bfb02c2fc91f03763ab4 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 5 Jun 2019 12:57:14 +0900
Subject: Test for f1f04caf60e4fc9dc3b12109e0be831f2d692810


diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index 9a0de5c..54e39a0 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -880,6 +880,14 @@ end.join https://github.com/ruby/ruby/blob/trunk/test/ruby/test_exception.rb#L880
     }
   end
 
+  def test_frozen_error_message
+    obj = Object.new.freeze
+    e = assert_raise_with_message(FrozenError, /can't modify frozen #{obj.class}/) {
+      obj.instance_variable_set(:@test, true)
+    }
+    assert_include(e.message, obj.inspect)
+  end
+
   def test_name_error_new_default
     error = NameError.new
     assert_equal("NameError", error.message)
-- 
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