anchor.diff:    };
   
     net = buildFromGitHub {
  -    rev = "024ed629fd292398cfd43c9678a5bf004f7defdc";
  -    date = "2016-04-03";
  +    rev = "318395d8b12f5dd0f1b7cd0fbb95195f49acb0f9";
  +    date = "2016-04-01";
       owner  = "golang";
       repo   = "net";
  -    sha256 = "02x9vc834f0lhvw4jj2v6l9wjv52w6aiwjrn2mmi3pws22gb79rk";
  +    sha256 = "0swgnwf13qs3inqr06z9qa8d1hhyagi3svfzkn2fb5jdd1b43yqy";
       goPackagePath = "golang.org/x/net";
       goPackageAliases = [
         "code.google.com/p/go.net"
  
positive.code:   vault-api = buildFromGitHub {
      inherit (vault) rev owner repo sha256;
      subPackages = [ "api" ];
      propagatedBuildInputs = [ hcl structs go-cleanhttp mapstructure ];
    };
  
    vcs = buildFromGitHub {
  
negative.code:   };
  
    sys = buildFromGitHub {
      rev = "b323466d0bc6669362b0836480b30452d2c00db9";
      date = "2016-04-05";
      owner  = "golang";
      repo   = "sys";
      sha256 = "16f1ij0vsvrci0qvncw9pzgcqxzfb7n2py7fibzq0b7azw9c3nih";
      goPackagePath = "golang.org/x/sys";
      goPackageAliases = [
        "github.com/golang/sys"
  