From 50bad7159a8e1f9846f37421c941f6fa8f087591 Mon Sep 17 00:00:00 2001
From: Noah Gibbs <noah.gibbs@shopify.com>
Date: Sat, 21 May 2022 00:39:37 +0100
Subject: Special-case jit_guard_known_class for strings. This can remove
 (#5920)

runtime guard-checks for String#to_s, making some blocks too
short to invalidate later. Add NOPs in those cases to reserve space.
---
 bootstraptest/test_yjit.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'bootstraptest/test_yjit.rb')

diff --git a/bootstraptest/test_yjit.rb b/bootstraptest/test_yjit.rb
index b0c17229c5..6d0ba93fc8 100644
--- a/bootstraptest/test_yjit.rb
+++ b/bootstraptest/test_yjit.rb
@@ -1337,6 +1337,16 @@ assert_equal 'foo123', %q{
   make_str("foo", 123)
 }
 
+# test that invalidation of String#to_s doesn't crash
+assert_equal 'meh', %q{
+  class String
+    def to_s
+      "meh"
+    end
+  end
+  "".to_s
+}
+
 # test string interpolation with overridden to_s
 assert_equal 'foo', %q{
   class String
-- 
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