Gem::Commands::SetupCommand#remove_file_list

# File tmp/rubies/ruby-4.0.0/lib/rubygems/commands/setup_command.rb, line 644
def remove_file_list(files, dir)
  Dir.chdir dir do
    files.each do |file|
      FileUtils.rm_f file

      warn "unable to remove old file #{file} please remove it by hand" if
        File.exist? file
    end
  end
end