class Cucumber::Formatter::Rerun

def after_features(features)
  files = @file_names.uniq.map do |file|
    lines = @file_colon_lines[file]
    "#{file}:#{lines.join(':')}"
  end
  @io.puts files.join(' ')
  
  # Flusing output to rerun tempfile here...
  @io.flush
  @io.close
end