anchor.diff:      ];
     };
   
  -  sets = buildFromGitHub {
  -    version = 1;
  -    rev = "6c54cb57ea406ff6354256a4847e37298194478a";
  -    owner  = "feyeleanor";
  -    repo   = "sets";
  -    sha256 = "11gg27znzsay5pn9wp7rl427v8bl1rsncyk8nilpsbpwfbz7q7vm";
  -    date = "2013-02-27";
  -    propagatedBuildInputs = [
  -      slices
  -    ];
  -  };
  -
     sftp = buildFromGitHub {
       version = 3;
       owner = "pkg";
  
positive.code:     propagatedBuildInputs = [
        go-runewidth
      ];
    };
  
    tagflag = buildFromGitHub {
      version = 3;
      rev = "e7497e81ffa475caf0fc24e999eb29edc0335040";
      date = "2016-06-15";
      owner  = "anacrolix";
      repo   = "tagflag";
      sha256 = "f4cc0058b867661fd949329c0eb3fba724143b54be17ba822e5b38ae5820f9a4";
      propagatedBuildInputs = [
        go-humanize
        iter
        missinggo_lib
        xstrings
      ];
      meta.autoUpdate = false;
    };
  
    tail = buildFromGitHub {
  
negative.code: 
    tools = buildFromGitHub {
      version = 3;
      rev = "2c687adedb6d6e9609b0f4b0c69d445c6e2cd69c";
      date = "2017-11-28";
      owner = "golang";
      repo = "tools";
      sha256 = "0gdkm2lhrm24880xbvhsqb2s18vvf5l2a9ahcd7arv05l81awk9n";
      goPackagePath = "golang.org/x/tools";
  
      preConfigure = ''
  