anchor.diff:  
     mapstructure = buildFromGitHub {
       version = 2;
  -    date = "2017-03-07";
  -    rev = "53818660ed4955e899c0bcafa97299a388bd7c8e";
  +    date = "2017-04-22";
  +    rev = "cc8532a8e9a55ea36402aa21efdf403a60d34096";
       owner  = "mitchellh";
       repo   = "mapstructure";
  -    sha256 = "1r5kja1nxir0h9876y4536xsb7id5zbvy10nknw87v14xqxrrkfm";
  +    sha256 = "0pa1lpjikxn6ds5c5i413k5zm7iajqc279m10ib22aqrsv7a1c06";
     };
   
     match = buildFromGitHub {
  
positive.code:   };
  
    datadog-go = buildFromGitHub {
      version = 1;
      rev = "1.0.0";
      owner = "DataDog";
      repo = "datadog-go";
      sha256 = "13kjgqx5bs187fapqiirsaig950n2is0a35y2b7ap07dazxxxh3m";
    };
  
    dbus = buildFromGitHub {
  
negative.code: 
    net = buildFromGitHub {
      version = 2;
      rev = "d212a1ef2de2f5d441c327b8f26cf3ea3ea9f265";
      date = "2017-04-23";
      owner  = "golang";
      repo   = "net";
      sha256 = "1c161xdfcakl58pawah66lgsrhc43yir7yvif5q6s8mx9mc4ixm0";
      goPackagePath = "golang.org/x/net";
      goPackageAliases = [
        "github.com/hashicorp/go.net"
  