https://git.ruby-lang.org/ruby.git/commit/?id=7f29020590

From 7f2902059031ffe0dad35c9832e4be33d57c5588 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@o...>
Date: Thu, 1 Oct 2020 13:43:16 +1300
Subject: Raise an exception if the scheduler was already closed.


diff --git a/test/fiber/scheduler.rb b/test/fiber/scheduler.rb
index 6e04409..408e0e5 100644
--- a/test/fiber/scheduler.rb
+++ b/test/fiber/scheduler.rb
@@ -101,6 +101,8 @@ class Scheduler https://github.com/ruby/ruby/blob/trunk/test/fiber/scheduler.rb#L101
   end
 
   def close
+    raise "Scheduler already closed!" if @closed
+
     self.run
   ensure
     @closed = true
-- 
cgit v0.10.2


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