anchor.diff:  
     consul-api = buildFromGitHub {
       inherit (consul) owner repo;
  -    rev = "446d76b432b6a099b2a8d899de2cd36c243e2d22";
  -    date = "2016-05-27";
  -    sha256 = "b4e4acd8ec838f8fdd3b26d1b6bc1100f2996ed17477aa8718e12ecc466216bc";
  +    rev = "v0.6.4";
  +    sha256 = "157g5j6a8jf762p308w6sy4byhcqqvm3il5iyjwf5ykavvjizz31";
       buildInputs = [ go-cleanhttp serf ];
       subPackages = [ "api" "tlsutil" ];
     };
  
positive.code:   };
  
    utp = buildFromGitHub {
      rev = "065fae8ee7c83d42cea2b452019577e6dc210e6b";
      owner  = "anacrolix";
      repo   = "utp";
      sha256 = "1djs6kz6jn6iyqspign5npams4dhh2g2g2gn6qbbk2db2kxn4jml";
      date = "2016-05-27";
      propagatedBuildInputs = [
        envpprof
        missinggo
  
negative.code:   };
  
    missinggo = buildFromGitHub {
      rev = "e40875155efce3d98562ca9e265e152c364ada3e";
      owner  = "anacrolix";
      repo   = "missinggo";
      sha256 = "0ph15im9qv4inny5vdiqcccfa5i5imckqn6h761bwlinazj5xz4i";
      date = "2016-05-31";
      propagatedBuildInputs = [
        b
        btree
  