anchor.diff:        yaml_v2
       ];
       meta.useUnstable = true;
  -    date = "2017-11-08";
  +    date = "2017-11-14";
       postPatch = ''
         rm cmd/gateway-{azure,s3}*.go
         sed -i 's,return newAzureLayer.*,break,' cmd/gateway-main.go
  
positive.code: 
    build = buildFromGitHub {
      version = 3;
      rev = "67504a627170c7ae940990cead6d6d386c835e1e";
      date = "2017-11-10";
      owner = "golang";
      repo = "build";
      sha256 = "02k9kmzqmmpchmpcbzg8l44ccl585kjn9fvph4jsfcz1msn5i5lr";
      goPackagePath = "golang.org/x/build";
      subPackages = [
        "autocertcache"
  
negative.code: 
    swarmkit = buildFromGitHub {
      version = 3;
      rev = "663fa6e79a4fd020664b50c4f62cbfc20c3780f5";
      owner = "docker";
      repo = "swarmkit";
      sha256 = "0v3sy57xfpa1fbcgpn2rrq833qjghbdnpjgdjr1q0b4f0lm5a1a8";
      date = "2017-11-13";
      subPackages = [
        "api"
        "api/deepcopy"
  