Issue #20699 has been updated by larskanis (Lars Kanis). There is a fix available since one year, but no feedback at all. That makes it difficult to contribute anything: https://github.com/ruby/ruby/pull/12377 ---------------------------------------- Bug #20699: On Windows, the `__dir__` keyword is garbled in paths containing Japanese characters, and `require_relative` fails as well https://bugs.ruby-lang.org/issues/20699#change-115800 * Author: flatland001 (Hayato Arai) * Status: Open * ruby -v: ruby 3.3.4 (2024-07-09 revision be1089c8ec) [x64-mingw-ucrt] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- In paths containing Japanese characters, such as: C:\テスト_test\test.rb Code: ``` ruby # this code -> C:\テスト_test\test.rb # external file -> C:\テスト_test\lib\foo.rb p __dir__ p __dir__.encoding p File.dirname(File.expand_path(__FILE__)) p File.dirname(File.expand_path(__FILE__)).encoding print "__dir__ == File.dirname(File.expand_path(__FILE__)): " p __dir__ == File.dirname(File.expand_path(__FILE__)) begin require_relative "lib/foo" puts "foo.rb loaded" rescue LoadError puts "LoadError: #{$!}" end ``` Results: ``` "C:/?e?X?g_test" #<Encoding:Windows-31J> "C:/\x{8365}\x{8358}\x{8367}_test" #<Encoding:Windows-31J> __dir__ == File.dirname(File.expand_path(__FILE__)): false LoadError: cannot load such file -- C:/?e?X?g_test/lib/foo ``` However, in ruby 3.2.5 (2024-07-26 revision 31d0f1a2e7) [x64-mingw-ucrt], the same code produces the following expected results: ``` "C:/\x{8365}\x{8358}\x{8367}_test" #<Encoding:Windows-31J> "C:/\x{8365}\x{8358}\x{8367}_test" #<Encoding:Windows-31J> __dir__ == File.dirname(File.expand_path(__FILE__)): true foo.rb loaded ``` Is this behavior expected, or could this be a bug in the Ruby interpreter on Windows? If this is my misunderstanding or a known issue, I apologize. Thank you for your consideration. Environment Information: - OS: Windows 11 Pro 23H2 (OS build 22631.4037) - Installed via: RubyInstaller - Shell: Command Prompt - File System: NTFS - System Locale: Japanese (Japan), Language: Japanese -- https://bugs.ruby-lang.org/