Issue #20700 has been updated by nobu (Nobuyoshi Nakada). If there is not a `\n', that file has only a comment. It would be another thing than `\r\n', I think. ---------------------------------------- Bug #20700: `warn_cr_in_shebang()` doesn't fire if there's no `\n` https://bugs.ruby-lang.org/issues/20700#change-109545 * Author: AMomchilov (Alexander Momchilov) * Status: Open * ruby -v: ruby 3.3.4 (2024-07-09 revision be1089c8ec) [arm64-darwin23] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- The `warn_cr_in_shebang()` function looks for `\r\n` together, but the `\r` should emit a warning, regardless if there's also a `\n` or not. ```ruby #!/usr/bin/ruby require "tempfile" require "open3" def run_rb(ruby_src) puts "===== Output of #{ruby_src.inspect}:" Tempfile.create("script.rb") do |f| f.print(ruby_src) f.close stdout_and_stderr_str, status = Open3.capture2e("/opt/rubies/3.3.4/bin/ruby", f.path) raise unless status.success? puts stdout_and_stderr_str end end run_rb("#!ruby") # ✅ no warning run_rb("#!ruby\r") # ❌ no warning! run_rb("#!ruby\r\n") # ✅ warns run_rb("#!ruby -Eutf-8\r\n123") # ✅ warns ``` -- https://bugs.ruby-lang.org/