https://git.ruby-lang.org/ruby.git/commit/?id=f6387ae073

From f6387ae0737ea19a00caa3af14c489b404c1c0e1 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 29 Jan 2021 08:53:45 +0900
Subject: Fix absolute path predicate on Windows

A path starts with '/' is not an absolute path on Windows, because
of drive letter or UNC.
---
 lib/irb/ext/loader.rb | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/lib/irb/ext/loader.rb b/lib/irb/ext/loader.rb
index 5a198bb..90dcd70 100644
--- a/lib/irb/ext/loader.rb
+++ b/lib/irb/ext/loader.rb
@@ -31,8 +31,31 @@ module IRB # :nodoc: https://github.com/ruby/ruby/blob/trunk/lib/irb/ext/loader.rb#L31
       load_file(path, priv)
     end
 
+    if File.respond_to?(:absolute_path?)
+      def absolute_path?(path)
+        File.absolute_path?(path)
+      end
+    else
+      separator =
+        if File::ALT_SEPARATOR
+          File::SEPARATOR
+        else
+          "[#{Regexp.quote(File::SEPARATOR + File::ALT_SEPARATOR)}]"
+        end
+      ABSOLUTE_PATH_PATTERN = # :nodoc:
+        case Dir.pwd
+        when /\A\w:/, /\A#{separator}{2}/
+          /\A(?:\w:|#{separator})#{separator}/
+        else
+          /\A#{separator}/
+        end
+      def absolute_path?(path)
+        ABSOLUTE_PATH_PATTERN =~ path
+      end
+    end
+
     def search_file_from_ruby_path(fn) # :nodoc:
-      if /^#{Regexp.quote(File::Separator)}/ =~ fn
+      if absolute_path?(fn)
         return fn if File.exist?(fn)
         return nil
       end
-- 
cgit v1.1


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