https://git.ruby-lang.org/ruby.git/commit/?id=d9c6f8d45c

From d9c6f8d45c658121dcabb2e26cddb473e907d724 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Tue, 5 Apr 2022 19:23:38 +0900
Subject: Try to fix NoMethodError on slow environments

```
  1) Failure:
TestParallel::TestParallel#test_hungup [/home/user/ruby/tool/test/testunit/test_parallel.rb:215]:
Expected /^Retrying hung up testcases\.+$/ to match "Run options: \n" +
"  --seed=43403\n" +
"  --ruby\n" +
"  \"./miniruby -I../lib -I. -I.ext/common ../tool/runruby.rb --extout=.ext -- --disable-gems\"\n" +
"  -j\n" +
"  t1\n" +
"  --worker-timeout=1\n" +
"\n" +
"# Running tests:\n" +
"\n" +
"/home/user/ruby/tool/lib/test/unit.rb:687:in `block in _run_parallel': undefined method `<' for nil:NilClass (NoMethodError)\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:538:in `block in quit_workers'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:537:in `reject!'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:537:in `quit_workers'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:687:in `_run_parallel'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:810:in `_run_suites'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:849:in `_run_suites'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1479:in `_run_anything'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1263:in `_run_anything'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1654:in `run_tests'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1641:in `block in _run'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1640:in `each'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1640:in `_run'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1682:in `run'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1034:in `run'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:882:in `run'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:154:in `run'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1761:in `run'\n" +
"\tfrom /home/user/ruby/tool/lib/test/unit.rb:1765:in `run'\n" +
"\tfrom /home/user/ruby/tool/test/testunit/tests_for_parallel/runner.rb:14:in `<main>'\n".
```
---
 tool/lib/test/unit.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index 0c752c0fa7..cca75520d0 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -684,7 +684,7 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L684
 
             if !(_io = IO.select(@ios, nil, nil, timeout))
               timeout = Time.now - @worker_timeout
-              quit_workers {|w| w.response_at < timeout}&.map {|w|
+              quit_workers {|w| w.response_at&.<(timeout) }&.map {|w|
                 rep << {file: w.real_file, result: nil, testcase: w.current[0], error: w.current}
               }
             elsif _io.first.any? {|io|
-- 
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