    # File lib/rubygems/commands/which_command.rb, line 62
      def find_paths(package_name, dirs)
        result = []

        dirs.each do |dir|
          EXT.each do |ext|
            full_path = File.join dir, "#{package_name}#{ext}"
            if File.exist? full_path then
              result << full_path
              return result unless options[:show_all]
            end
          end
        end

        result
      end