https://git.ruby-lang.org/ruby.git/commit/?id=50bc7e7e9f

From 50bc7e7e9f0da6b27db06ac063257de0b97ed9b3 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Sat, 9 Nov 2019 15:20:52 +0900
Subject: Add debug print

http://ci.rvm.jp/results/trunk-mjit@silicon-docker/2380788
```
test_all             #<Thread:0x000055b6c8e9fca8@/tmp/ruby/v2/src/trunk-mjit/tool/lib/test/unit/parallel.rb:42 run> terminated with exception (report_on_exception is true):
<internal:pack>:134:in `pack': no implicit conversion of false into String (TypeError)
	from /tmp/ruby/v2/src/trunk-mjit/tool/lib/test/unit/parallel.rb:160:in `_report'
	from /tmp/ruby/v2/src/trunk-mjit/tool/lib/test/unit/parallel.rb:45:in `block in _run_suite'
```

diff --git a/tool/lib/test/unit/parallel.rb b/tool/lib/test/unit/parallel.rb
index 1260067..3fe7629 100644
--- a/tool/lib/test/unit/parallel.rb
+++ b/tool/lib/test/unit/parallel.rb
@@ -158,6 +158,8 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit/parallel.rb#L158
 
       def _report(res, *args) # :nodoc:
         @stdout.write(args.empty? ? "#{res}\n" : "#{res} #{args.pack("m0")}\n")
+      rescue TypeError => e
+        abort("#{e.inspect} in _report(#{res.inspect}, #{args.inspect})\n#{e.backtrace.join("\n")}")
       end
 
       def puke(klass, meth, e) # :nodoc:
-- 
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