From e4abacc53396865e20c226a7ac8ed8b86267874b Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Thu, 4 Dec 2025 14:29:35 +0900
Subject: [PATCH] Ractor.store_if_absent should not warn

```ruby
$VERBOSE = true

Ractor.store_if_absent :key do
end #=> warning: the block passed to 'Ractor.store_if_absent' defined at <internal:ractor>:474 may be ignored
```
---
 ractor.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ractor.rb b/ractor.rb
index ba9cfe14f3..4e3aa2be13 100644
--- a/ractor.rb
+++ b/ractor.rb
@@ -872,6 +872,7 @@ class Ractor
   #   }.map(&:value).uniq.size #=> 1 and f() is called only once
   #
   def self.store_if_absent(sym)
+    Primitive.attr! :use_block
     Primitive.ractor_local_value_store_if_absent(sym)
   end