https://git.ruby-lang.org/ruby.git/commit/?id=d77a42fbfd

From d77a42fbfd60f4e4f49f1feb56e089494fbf3572 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Wed, 10 Feb 2021 23:24:39 +0900
Subject: [ruby/irb] Suppress error when File::ALT_SEPARATOR is nil

https://github.com/ruby/irb/commit/96accf3b95
---
 lib/irb/ext/loader.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/irb/ext/loader.rb b/lib/irb/ext/loader.rb
index 90dcd70..42df0ac 100644
--- a/lib/irb/ext/loader.rb
+++ b/lib/irb/ext/loader.rb
@@ -40,7 +40,9 @@ module IRB # :nodoc: https://github.com/ruby/ruby/blob/trunk/lib/irb/ext/loader.rb#L40
         if File::ALT_SEPARATOR
           File::SEPARATOR
         else
-          "[#{Regexp.quote(File::SEPARATOR + File::ALT_SEPARATOR)}]"
+          separators = File::SEPARATOR
+          separators += File::ALT_SEPARATOR if File::ALT_SEPARATOR
+          "[#{Regexp.quote(separators)}]"
         end
       ABSOLUTE_PATH_PATTERN = # :nodoc:
         case Dir.pwd
-- 
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