From 9168cad4d63a5d281d443bde4edea6be213b0b25 Mon Sep 17 00:00:00 2001
From: Randy Stauner <randy@r4s6.net>
Date: Thu, 11 Dec 2025 15:56:16 -0700
Subject: YJIT: Bail out if proc would be stored above stack top

Fixes [Bug #21266].
---
 test/ruby/test_yjit.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_yjit.rb b/test/ruby/test_yjit.rb
index ce9dfca390..2096585451 100644
--- a/test/ruby/test_yjit.rb
+++ b/test/ruby/test_yjit.rb
@@ -1772,6 +1772,18 @@ class TestYJIT < Test::Unit::TestCase
     RUBY
   end
 
+  def test_proc_block_with_kwrest
+    # When the bug was present this required --yjit-stats to trigger.
+    assert_compiles(<<~RUBY, result: {extra: 5})
+      def foo = bar(w: 1, x: 2, y: 3, z: 4, extra: 5, &proc { _1 })
+      def bar(w:, x:, y:, z:, **kwrest) = yield kwrest
+
+      GC.stress = true
+      foo
+      foo
+    RUBY
+  end
+
   private
 
   def code_gc_helpers
-- 
cgit v1.2.3