From 84920fe8eeab41d44dbe3c6b8ca076471694c3be Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maximechevalierb@gmail.com>
Date: Thu, 15 Jul 2021 14:56:17 -0400
Subject: [PATCH] Update yjit.rb
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Co-authored-by: Rafael França <rafael.franca@shopify.com>
---
 yjit.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/yjit.rb b/yjit.rb
index f5b2fca54e..6c4d6de347 100644
--- a/yjit.rb
+++ b/yjit.rb
@@ -63,7 +63,7 @@ module YJIT
       highlight = ->(comment) { "<b>#{comment}</b>" }
       linebreak = "<br align=\"left\"/>\n"
 
-      buff = ''.dup
+      buff = +''
       blocks = blocks_for(iseq).sort_by(&:id)
       buff << "digraph g {\n"