https://git.ruby-lang.org/ruby.git/commit/?id=7d4a0c4b93

From 7d4a0c4b93cbdf40a9a43c4974199405099a8545 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 15 Jun 2021 00:03:05 +0900
Subject: Suppress exception report in inner thread

---
 test/fiber/test_thread.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/fiber/test_thread.rb b/test/fiber/test_thread.rb
index 7221f76..843604b 100644
--- a/test/fiber/test_thread.rb
+++ b/test/fiber/test_thread.rb
@@ -52,7 +52,9 @@ class TestFiberThread < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/fiber/test_thread.rb#L52
       Fiber.set_scheduler scheduler
 
       Fiber.schedule do
-        Thread.new{}.join
+        Thread.new{
+          Thread.current.report_on_exception = false
+        }.join
       end
 
       scheduler.run
-- 
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