# File lib/rspec/core/configuration.rb, line 293
      def files_or_directories_to_run=(*files)
        self.files_to_run = files.flatten.collect do |file|
          if File.directory?(file)
            filename_pattern.split(",").collect do |pattern|
              Dir["#{file}/#{pattern.strip}"]
            end
          else
            if file =~ /(\:(\d+))$/
              self.line_number = $2
              file.sub($1,'')
            else
              file
            end
          end
        end.flatten
      end