anchor.diff:  
     docker = buildFromGitHub {
       version = 2;
  -    rev = "c264aefdac2d0698df62d203455fcee83e9fd7ee";
  +    rev = "e1101b1295f05ef3c6f1a684a51cd508b3c7874c";
       owner = "docker";
       repo = "docker";
  -    sha256 = "1l45nvl42b85lb74aj2j4yw9nigcgv77hrly9hzbi8j4h1rc2f1g";
  +    sha256 = "0chm6qmn6xjl2xvp294yr4ibmdr5bhfa8nci0rh1slkvpz4wh4sg";
       meta.useUnstable = true;
  -    date = "2017-04-23";
  +    date = "2017-04-25";
       propagatedBuildInputs = [
         distribution_for_docker
         errors
  
positive.code: 
    procfs = buildFromGitHub {
      version = 2;
      rev = "332f6238064950a97bc3ed3f5421f6418537e707";
      date = "2017-04-21";
      owner  = "prometheus";
      repo   = "procfs";
      sha256 = "1pb3p028jcab3rpbrl5gxxbyjvrkmr4s4d68hqd86kzjabb3765m";
    };
  
    properties = buildFromGitHub {
  
negative.code: 
    syncthing = buildFromGitHub rec {
      version = 2;
      rev = "v0.14.27";
      owner = "syncthing";
      repo = "syncthing";
      sha256 = "06i7ci4zfi78cgsb27mndsbw6d7vcwb4fn3nq3wyfpdql5hmmvi4";
      buildFlags = [ "-tags noupgrade" ];
      buildInputs = [
        AudriusButkevicius_cli
  