anchor.diff:    };
   
     yaml-v2 = buildFromGitHub {
  -    rev = "f7716cbe52baa25d2e9b0d0da546fcf909fc16b4";
  -    date = "2015-12-01";
  +    rev = "a83829b6f1293c91addabc89d0571c246397bbf4";
  +    date = "2016-03-01";
       owner = "go-yaml";
       repo = "yaml";
  -    sha256 = "1v569hk9n995vvddh99xc9n1nhakl39hi88bqyxamgc4gxdmnfcw";
  +    sha256 = "1m4dsmk90sbi17571h6pld44zxz7jc4lrnl4f27dpd1l8g5xvjhh";
       goPackagePath = "gopkg.in/yaml.v2";
     };
   
  
positive.code:   };
  
    sys = buildFromGitHub {
      rev = "54535356f1d989a6072b0898d9ddc4dd7009dcd3";
      date = "2016-02-29";
      owner  = "golang";
      repo   = "sys";
      sha256 = "14gfzj3jwbskz6303108l4hpnb85zc9fk0rdnq2mhxnfxr4r1rxn";
      goPackagePath = "golang.org/x/sys";
      goPackageAliases = [
        "github.com/golang/sys"
  
negative.code:   };
  
    dns = buildFromGitHub {
      rev = "4adf880b0237527fe9e86701c412d6906e5fcf9c";
      date = "2016-03-02";
      owner  = "miekg";
      repo   = "dns";
      sha256 = "191qwxin1ahqnkvpxgp1avip528sqydac4qn7qsxqrvnd3fz0fxs";
    };
  
    docker = buildFromGitHub {
  