From ce6e9a234e4e6e007d0d0de852fefd7bc231c52a Mon Sep 17 00:00:00 2001
From: Julien Portalier <julien@portalier.com>
Date: Thu, 9 Jan 2025 14:15:23 +0100
Subject: [PATCH] Fix: macro 'class_property' must be defined

---
 src/crystal/once.cr | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/crystal/once.cr b/src/crystal/once.cr
index 0460a82d0f6b..bc190802ac03 100644
--- a/src/crystal/once.cr
+++ b/src/crystal/once.cr
@@ -27,7 +27,13 @@
 
     {% if flag?(:preview_mt) || flag?(:win32) %}
       @@once_mutex = uninitialized Mutex
-      class_property once_mutex : Mutex
+
+      def self.once_mutex : Mutex
+        @@once_mutex
+      end
+
+      def self.once_mutex=(@@once_mutex : Mutex)
+      end
     {% end %}
 
     # Using @[NoInline] so LLVM optimizes for the hot path (var already