https://git.ruby-lang.org/ruby.git/commit/?id=01b6c520f5

From 01b6c520f5ee48aad7a0f3dfd690616d179e9e1f Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Tue, 18 Aug 2020 12:38:07 +0900
Subject: [ruby/irb] Change the way the IRB is invoked as an external process

https://github.com/ruby/irb/commit/f4bcdf4375

diff --git a/test/irb/test_history.rb b/test/irb/test_history.rb
index 23242fa..61bd41c 100644
--- a/test/irb/test_history.rb
+++ b/test/irb/test_history.rb
@@ -117,8 +117,7 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_history.rb#L117
 
         with_temp_stdio do |stdin, stdout|
           replace_stdio(stdin.path, stdout.path) do
-            bundle_exec = ENV.key?('BUNDLE_GEMFILE') ? ['-rbundler/setup'] : []
-            cmds = %W[ruby] + bundle_exec + %W[-W0 -rirb -e 'IRB.start(__FILE__)']
+            cmds = %W[ruby -Ilib:test -W0 -rirb -e 'IRB.start(__FILE__)']
             yield(stdin, stdout)
             stdin.close
             system(cmds.join(' '))
-- 
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