From 072772893bfea8c0a7469233aeb250be3e13ba8a Mon Sep 17 00:00:00 2001
From: Sijawusz Pur Rahnama <sija@sija.pl>
Date: Thu, 23 Feb 2023 14:16:37 +0100
Subject: [PATCH] Add missing require for `Crystal::ThreadLocalValue` (#13092)

---
 src/reference.cr | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/reference.cr b/src/reference.cr
index 4f5f9f5571e3..a9dee7109059 100644
--- a/src/reference.cr
+++ b/src/reference.cr
@@ -1,3 +1,7 @@
+{% if flag?(:preview_mt) %}
+  require "crystal/thread_local_value"
+{% end %}
+
 # `Reference` is the base class of classes you define in your program.
 # It is set as a class' superclass when you don't specify one:
 #