From 131c31a9209c61f84d318aa18b61f468f48b8219 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 26 Oct 2022 19:43:14 +0900
Subject: [Bug #19081] Show the caller location in warning for Ractor

The internal location in ractor.rb is not usefull at all.
```
$ ruby -e 'Ractor.new {}'
<internal:ractor>:267: warning: Ractor is experimental, ...
```
---
 ractor.rb | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'ractor.rb')

diff --git a/ractor.rb b/ractor.rb
index 8e229d4700..1031fe499b 100644
--- a/ractor.rb
+++ b/ractor.rb
@@ -262,6 +262,10 @@ class Ractor
   def self.new(*args, name: nil, &block)
     b = block # TODO: builtin bug
     raise ArgumentError, "must be called with a block" unless block
+    if __builtin_cexpr!("RBOOL(ruby_single_main_ractor)")
+      warn("Ractor is experimental, and the behavior may change in future versions of Ruby! " \
+           "Also there are many implementation issues.", uplevel: 0, category: :experimental)
+    end
     loc = caller_locations(1, 1).first
     loc = "#{loc.path}:#{loc.lineno}"
     __builtin_ractor_create(loc, name, args, b)
-- 
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