anchor.diff:      version = 6;
       owner = "minio";
       repo = "mc";
  -    rev = "1b794a4ae1af46bdeb86fbdb7ba16bbd31366d83";
  -    sha256 = "05x92p09pfkkw6gdrhcmvkkz3kipd7vkzfy8bmjg2c685c30b8s4";
  +    rev = "961c4b5daebe0f5f8ac2930f087a14a597e95f5b";
  +    sha256 = "0yip5mwf4b90hq079rlqd0m7kv96ws34n8qvk3kpcgj2h98sbr1w";
       propagatedBuildInputs = [
         cli_minio
         color
  
positive.code: 
    kr_text = buildFromGitHub {
      version = 6;
      rev = "7cafcd837844e784b526369c9bce262804aebc60";
      date = "2016-05-04";
      owner = "kr";
      repo = "text";
      sha256 = "0qmc5rl6rhafiqiqnfrajngzr7qmwfwnj18yccd8jkpd5ix4r70d";
      propagatedBuildInputs = [
        pty
      ];
  
negative.code: 
    chroma = buildFromGitHub {
      version = 6;
      rev = "1b755a90bd109f170385cb3964f0abdfd3451145";
      owner  = "alecthomas";
      repo   = "chroma";
      sha256 = "0a7x6lfynhpilmpvla75lfp69ncm28300kw3s9r2d6fby41msj00";
      excludedPackages = "cmd";
      propagatedBuildInputs = [
        fnmatch
        regexp2
      ];
      meta.useUnstable = true;
      date = "2018-05-15";
    };
  
    circbuf = buildFromGitHub {
  