https://git.ruby-lang.org/ruby.git/commit/?id=c25c1d4e54

From c25c1d4e54c51594cbc6a6d51ae79885bea7a7b3 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 23 Jun 2022 16:45:05 +0900
Subject: Non-void functions must return value

---
 thread_win32.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/thread_win32.c b/thread_win32.c
index 8cae77558e..ccff8bc93f 100644
--- a/thread_win32.c
+++ b/thread_win32.c
@@ -33,12 +33,14 @@ rb_internal_thread_event_hook_t * https://github.com/ruby/ruby/blob/trunk/thread_win32.c#L33
 rb_internal_thread_add_event_hook(rb_internal_thread_event_callback callback, rb_event_flag_t internal_event, void *user_data)
 {
     // not implemented
+    return NULL;
 }
 
 bool
 rb_internal_thread_remove_event_hook(rb_internal_thread_event_hook_t * hook)
 {
     // not implemented
+    return false;
 }
 
 RBIMPL_ATTR_NORETURN()
-- 
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