https://git.ruby-lang.org/ruby.git/commit/?id=9d5b3e1d0f

From 9d5b3e1d0f3d44a52dffb6ec1f09c361c3b419c7 Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@s...>
Date: Tue, 31 Aug 2021 14:26:18 -0400
Subject: Add a small test for the code GC

---
 bootstraptest/test_yjit.rb | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/bootstraptest/test_yjit.rb b/bootstraptest/test_yjit.rb
index ea20224ec2..d91daea8ac 100644
--- a/bootstraptest/test_yjit.rb
+++ b/bootstraptest/test_yjit.rb
@@ -441,6 +441,29 @@ assert_equal '7', %q{ https://github.com/ruby/ruby/blob/trunk/bootstraptest/test_yjit.rb#L441
     foo(4)[1]
 }
 
+# Method redefinition while the method is on the stack
+assert_equal '[777, 1]', %q{
+    def foo
+        redef()
+        777
+    end
+
+    def redef
+        # Redefine the global foo
+        eval("def foo; 1; end", TOPLEVEL_BINDING)
+
+        # Collect dead code
+        GC.stress = true
+        GC.start
+
+        # But we will return to the original foo,
+        # which remains alive because it's on the stack
+    end
+
+    # Must produce [777, 1]
+    [foo, foo]
+}
+
 # Test for GC safety. Don't invalidate dead iseqs.
 assert_normal_exit %q{
   Class.new do
-- 
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