line_number

# File actionpack/lib/action_view/template_error.rb, line 57
    def line_number
      @line_number ||=
        if file_name
          regexp = /#{Regexp.escape File.basename(file_name)}:(\d+)/

          $1 if message =~ regexp or clean_backtrace.find { |line| line =~ regexp }
        end
    end