anchor.diff:  Parameters:
     VALUE: The value in the field to print.
     FIELD: The field-descriptor of the field.
  -  INDENT: If supplied, print indent the text by INDENT spaces.
  +  INDENT: If supplied, indent the text by INDENT spaces.
     STREAM: The stream to output to.
     PRINT-NAME: Whether or not to print the name of the field.
     PRETTY-PRINT: When true, print newlines and indentation."
  
positive.code:   INDENT: Indent the output by INDENT spaces.
    STREAM: The stream to print to.
    NAME: A string. If supplied (and PRINT-NAME is T), this string will be
      used as the name in printing.
    PRINT-NAME: Bool for printing the name of the top level proto message.
    PRETTY-PRINT: When true, generate line breaks and other human readable output
      in the text format. When false, replace line breaks with spaces."
  
negative.code: Parameters:
    VALUES: The list or vector of values in the field to print.
    FIELD: The field-descriptor of the field.
    INDENT: If supplied, indent the text by INDENT spaces.
    STREAM: The stream to output to.
    PRINT-NAME: Whether or not to print the name of the field.
    PRETTY-PRINT: When true, print newlines and indentation."
  