def file_match(file)
      raise ArgumentError, "Filename cannot be nil" if file.nil?
      { filename: file, matched: file, line: 1, column: 1 }
    end
def file_match(file)
      raise ArgumentError, "Filename cannot be nil" if file.nil?
      { filename: file, matched: file, line: 1, column: 1 }
    end
Create a match for a specified file. Use this if the presence of the file
 triggers the warning rather than content.