line_number() public

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# File actionview/lib/action_view/template/error.rb, line 199
      def line_number
        @line_number ||=
          if file_name
            regexp = /#{Regexp.escape File.basename(file_name)}:(\d+)/
            $1 if message =~ regexp || backtrace.find { |line| line =~ regexp }
          end
      end
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