anchor.diff:  
     grpc-gateway = buildFromGitHub {
       version = 2;
  -    rev = "686368427ddb9a51628d63db6c74fbc96a206e1f";
  +    rev = "fdf086986ea15be1188fe1e982b4948f34018269";
       owner = "grpc-ecosystem";
       repo = "grpc-gateway";
  -    sha256 = "1nvaz1clfjg3xriv18j5jhlbl0d0h9yiyfdipr6rf1d07xg518w1";
  +    sha256 = "1fgrip72cmfxjahhh95m3cwrmlpkpbz3z3c7znq357xbm4lyv6wp";
       propagatedBuildInputs = [
         glog
         grpc
         net
         protobuf
       ];
  -    date = "2017-01-27";
  +    date = "2017-02-17";
     };
   
   
  
positive.code:       profile
        structs
      ];
      date = "2017-02-15";
    };
  
    mdns = buildFromGitHub {
  
negative.code: 
    sync = buildFromGitHub {
      version = 2;
      rev = "86ddc858aa39d0f6cccccd733e482ddc52b852e9";
      date = "2017-02-16";
      owner  = "golang";
      repo   = "sync";
      sha256 = "1hiq7mj3hn6ikvphjia3v3i755rzp11qnglh0maax0a6scgsadnw";
      goPackagePath = "golang.org/x/sync";
      propagatedBuildInputs = [
        net
  