From a38168bc375b57bee18f80f5c4d3e67f1447010d Mon Sep 17 00:00:00 2001
From: Soutaro Matsumoto <matsumoto@soutaro.com>
Date: Fri, 27 Dec 2024 13:45:09 +0900
Subject: [PATCH] Fix `Ractor.store_if_absent`

It in fact yields `nil`. Added `nil` in block parameter for testing.
---
 core/ractor.rbs            | 2 +-
 test/stdlib/Ractor_test.rb | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/core/ractor.rbs b/core/ractor.rbs
index 731e835a2..eb50e1229 100644
--- a/core/ractor.rbs
+++ b/core/ractor.rbs
@@ -603,7 +603,7 @@ class Ractor
   #       }
   #     }.map(&:value).uniq.size #=> 1 and f() is called only once
   #
-  def self.store_if_absent: (Symbol) { () -> untyped } -> untyped
+  def self.store_if_absent: [A] (Symbol) { (nil) -> A } -> A
 
   # <!--
   #   rdoc-file=ractor.rb
diff --git a/test/stdlib/Ractor_test.rb b/test/stdlib/Ractor_test.rb
index ff1d512c9..9ed177c17 100644
--- a/test/stdlib/Ractor_test.rb
+++ b/test/stdlib/Ractor_test.rb
@@ -107,6 +107,13 @@ def test_shareable?
                      Ractor, :shareable?, []
   end
 
+  def test_store_if_absent
+    assert_send_type(
+      "(Symbol) { (nil) -> true } -> true",
+      Ractor, :store_if_absent, :test_store_if_absent, &->(_x) { true }
+    )
+  end
+
   def test_yield
     Ractor.new(Ractor.current) { |r| loop { r.take } }