anchor.diff:    };
   
     httprouter = buildFromGitHub {
  -    rev = "abb0dc9f755ff0a9d818db28d9d8b9810066e2b5";
  +    rev = "d94d446eb345f8da40124f1ba74a71ff4172f128";
       owner  = "julienschmidt";
       repo   = "httprouter";
  -    sha256 = "0dx0a6g28ii6w1j2c3k7z091r6bz7f8cc0zcmgqf2n6gvpb50amh";
  +    sha256 = "1k1a363y5c2lvj6sadaxpimxshvmbxnf39dy737pfxhpil74y30k";
     };
   
     hugo = buildFromGitHub {
  
positive.code:   };
  
    sys = buildFromGitHub {
      rev = "eb2c74142fd19a79b3f237334c7384d5167b1b46";
      date = "2016-01-26";
      owner  = "golang";
      repo   = "sys";
      sha256 = "0rzd48xzsmcg3cy222cz5hpai8xm74zhb185afhjhpib1r19gqfl";
      goPackagePath = "golang.org/x/sys";
      goPackageAliases = [
        "github.com/golang/sys"
  
negative.code:   };
  
    dns = buildFromGitHub {
      rev = "83f7d658ac219335d42f7ec4397a76e35ca7f835";
      date = "2016-02-05";
      owner  = "miekg";
      repo   = "dns";
      sha256 = "0rvvm0c84mw77bd95a06cpqn289qiim88iw38qhy8fvlnd9plpd7";
    };
  
    docopt-go = buildFromGitHub {
  