anchor.diff:  
     net = buildFromGitHub {
       version = 2;
  -    rev = "0b588ed7a0cd59c271d128ec8c429c1c1607e8ab";
  -    date = "2017-04-21";
  +    rev = "d212a1ef2de2f5d441c327b8f26cf3ea3ea9f265";
  +    date = "2017-04-23";
       owner  = "golang";
       repo   = "net";
  -    sha256 = "1fl15zfzx8nhxr0901q8fmari6q6sg6wjmn7mqq3sxz54n2g98iw";
  +    sha256 = "1c161xdfcakl58pawah66lgsrhc43yir7yvif5q6s8mx9mc4ixm0";
       goPackagePath = "golang.org/x/net";
       goPackageAliases = [
         "github.com/hashicorp/go.net"
  
positive.code: 
    procfs = buildFromGitHub {
      version = 2;
      rev = "1e2146578273cef808354faa16a1922e0b5d6b2f";
      date = "2017-04-19";
      owner  = "prometheus";
      repo   = "procfs";
      sha256 = "0hwf1f3k43dcnba6z45cws8qv1n99nz3mf7dc2xmifc2dkwg9sx7";
    };
  
    properties = buildFromGitHub {
  
negative.code:     version = 2;
      owner = "moby";
      repo = "moby";
      rev = "c264aefdac2d0698df62d203455fcee83e9fd7ee";
      date = "2017-04-23";
      sha256 = "0ff4dzwjs9spzi6im1262qc3v80y5sacls2a8rs78ssdb8979m3p";
      meta.useUnstable = true;
    };
  
    moby_for_go-dockerclient = buildFromGitHub {
      inherit (moby) version owner repo rev date sha256 meta;
      subPackages = [
        "api/types/swarm"
        "opts"
  