From 0aaa6133ed7365e5037ccdac8b59b00fb13aa50e Mon Sep 17 00:00:00 2001
From: Jemma Issroff <jemmaissroff@gmail.com>
Date: Wed, 19 Oct 2022 09:30:41 -0400
Subject: Transition frozen string to frozen root shape

Co-Authored-By: Aaron Patterson <tenderlove@ruby-lang.org>
---
 test/ruby/test_string.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index ab14a3c17b..4add7dfe2f 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -887,6 +887,18 @@ CODE
     end
   end
 
+  class StringWithIVSet < String
+    def set_iv
+      @foo = 1
+    end
+  end
+
+  def test_ivar_set_after_frozen_dup
+    str = StringWithIVSet.new.freeze
+    str.dup.set_iv
+    assert_raise(FrozenError) { str.set_iv }
+  end
+
   def test_each
     verbose, $VERBOSE = $VERBOSE, nil
 
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