https://git.ruby-lang.org/ruby.git/commit/?id=120b835fae

From 120b835fae2832ded4a02d3fcfc70749cad9d177 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Mon, 3 May 2021 08:38:54 -0700
Subject: [ruby/timeout] Only run timeout_after hook on fiber scheduler if
 scheduler exists

https://github.com/ruby/timeout/commit/4893cde0ed
---
 lib/timeout.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/timeout.rb b/lib/timeout.rb
index ee24349..e7b11c0 100644
--- a/lib/timeout.rb
+++ b/lib/timeout.rb
@@ -85,7 +85,7 @@ module Timeout https://github.com/ruby/ruby/blob/trunk/lib/timeout.rb#L85
 
     message ||= "execution expired".freeze
 
-    if (scheduler = Fiber.current_scheduler)&.respond_to?(:timeout_after)
+    if Fiber.respond_to?(:current_scheduler) && (scheduler = Fiber.current_scheduler)&.respond_to?(:timeout_after)
       return scheduler.timeout_after(sec, klass || Error, message, &block)
     end
 
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