https://git.ruby-lang.org/ruby.git/commit/?id=9b9bbaec11

From 9b9bbaec111c34d15d75750e300d94fb5c30c8b1 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@o...>
Date: Thu, 11 Feb 2021 21:29:17 +1300
Subject: Update lib/timeout.rb

Co-authored-by: Nobuyoshi Nakada <nobu@r...>
---
 lib/timeout.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/timeout.rb b/lib/timeout.rb
index 43f26f5..9625db7 100644
--- a/lib/timeout.rb
+++ b/lib/timeout.rb
@@ -81,7 +81,7 @@ module Timeout https://github.com/ruby/ruby/blob/trunk/lib/timeout.rb#L81
 
     message ||= "execution expired".freeze
 
-    if scheduler = Fiber.scheduler and scheduler.respond_to?(:timeout_raise)
+    if (scheduler = Fiber.scheduler)&.respond_to?(:timeout_raise)
       return scheduler.timeout_raise(sec, klass || Error, message, &block)
     end
 
-- 
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