# File lib/method_source.rb, line 35
  def self.source_helper(source_location)
    return nil if !source_location.is_a?(Array)

    file_name, line = source_location
    File.open(file_name) do |file|
      (line - 1).times { file.readline }

      code = ""
      loop do
        val = file.readline
        code << val

        return code if valid_expression?(code)
      end
    end
  end