https://git.ruby-lang.org/ruby.git/commit/?id=b83b27cddb

From b83b27cddbd8b7147dfbfb3c00102da365e97760 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 11 Feb 2021 21:03:11 +0900
Subject: [ruby/irb] Fix inverse separator condition

https://github.com/ruby/irb/commit/33f933196f
---
 lib/irb/ext/loader.rb | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/lib/irb/ext/loader.rb b/lib/irb/ext/loader.rb
index 42df0ac..af02899 100644
--- a/lib/irb/ext/loader.rb
+++ b/lib/irb/ext/loader.rb
@@ -38,11 +38,9 @@ module IRB # :nodoc: https://github.com/ruby/ruby/blob/trunk/lib/irb/ext/loader.rb#L38
     else
       separator =
         if File::ALT_SEPARATOR
-          File::SEPARATOR
+          "[#{Regexp.quote(File::SEPARATOR + File::ALT_SEPARATOR)}]"
         else
-          separators = File::SEPARATOR
-          separators += File::ALT_SEPARATOR if File::ALT_SEPARATOR
-          "[#{Regexp.quote(separators)}]"
+          File::SEPARATOR
         end
       ABSOLUTE_PATH_PATTERN = # :nodoc:
         case Dir.pwd
-- 
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