anchor.diff:      async
       attoparsec
       base
  +    bytestring
       cassava
       containers
       data-default
  
positive.code:   async,
    attoparsec,
    base,
    cassava,
    containers,
    data-default,
  
negative.code:     unix
      vector
      wcwidth
      word8
    ];
    testHaskellDepends = [
      ansi-terminal
      async
      attoparsec
      base
      bytestring
      cassava
      containers
      data-default
  