anchor.diff:    };
   
     sys = buildFromGitHub {
  -    rev = "7a56174f0086b32866ebd746a794417edbc678a1";
  -    date = "2016-03-02";
  +    rev = "9d4e42a20653790449273b3c85e67d6d8bae6e2e";
  +    date = "2016-03-04";
       owner  = "golang";
       repo   = "sys";
  -    sha256 = "0bmxxjqp842fdpi6h3049b9a360ijgm63yvn0piqxs29clg1iwka";
  +    sha256 = "08f14k43hmfhaypc284mymdqslixz9vq9siv1n39jyqvdakls9pk";
       goPackagePath = "golang.org/x/sys";
       goPackageAliases = [
         "github.com/golang/sys"
  
positive.code:   };
  
    crypto = buildFromGitHub {
      rev = "5dc8cb4b8a8eb076cbb5a06bc3b8682c15bdbbd3";
      date = "2016-02-25";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "18c1vpqlj10z1id66hglgnv51d9gwphgsdvxgghc6mcm01f1g5xj";
      goPackagePath = "golang.org/x/crypto";
      goPackageAliases = [
        "code.google.com/p/go.crypto"
  
negative.code:   };
  
    specs = buildFromGitHub {
      rev = "v0.4.0";
      owner = "opencontainers";
      repo = "specs";
      sha256 = "0rpwbv0jnzqqpjfrkrzn8n81s2win78s35j0fl23agv2zqz40r67";
      buildInputs = [ gojsonschema ];
    };
  
    stathat = buildFromGitHub {
  