set_spec_from_line_number

# File lib/spec/runner/options.rb, line 284
      def set_spec_from_line_number
        if examples.empty?
          if files.length == 1
            if File.directory?(files[0])
              error_stream.puts "You must specify one file, not a directory when using the --line option"
              exit(1) if stderr?
            else
              example = SpecParser.new.spec_name_for(files[0], line_number)
              @examples = [example]
            end
          else
            error_stream.puts "Only one file can be specified when using the --line option: #{files.inspect}"
            exit(3) if stderr?
          end
        else
          error_stream.puts "You cannot use both --line and --example"
          exit(4) if stderr?
        end
      end