From b83b27cddbd8b7147dfbfb3c00102da365e97760 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 11 Feb 2021 21:03:11 +0900
Subject: [PATCH] [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 42df0ac6c7..af028996e7 100644
--- a/lib/irb/ext/loader.rb
+++ b/lib/irb/ext/loader.rb
@@ -38,11 +38,9 @@ module IRB # :nodoc:
     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