anchor.diff:        ini
       ];
       meta.autoUpdate = false;
  -  };
  -
  -  missinggo = buildFromGitHub {
  -    version = 3;
  -    rev = "f3a48f14358dc22876048390ba49b963a476a5db";
  -    owner  = "anacrolix";
  -    repo   = "missinggo";
  -    sha256 = "606ad91d3710d33553a6644a5667ded12e662c678f6e15e57d22c64f85bb5810";
  -    date = "2016-06-18";
  -    propagatedBuildInputs = [
  -      b
  -      btree
  -      docopt-go
  -      envpprof
  -      go-humanize
  -      goskiplist
  -      iter
  -      net
  -      roaring
  -      tagflag
  -    ];
  -    meta.autoUpdate = false;
  -  };
  -
  -  missinggo_lib = missinggo.override {
  -    subPackages = [
  -      "."
  -    ];
  -    propagatedBuildInputs = [
  -      iter
  -    ];
     };
   
     mmap-go = buildFromGitHub {
  
positive.code: 
    build = buildFromGitHub {
      version = 3;
      rev = "6a84aa6258b4f371bbbd886a42489dd279e829df";
      date = "2017-11-28";
      owner = "golang";
      repo = "build";
      sha256 = "0mm1vifg0gkcicwagclhfb7dxbkyhc7bcgnqxp7if4kyq2g6vic8";
      goPackagePath = "golang.org/x/build";
      subPackages = [
        "autocertcache"
  
negative.code:     sha256 = "0sha9ghh6i9ca8bkw7qcjhppkb2dyyzh8zm760y4yi9i660r95h4";
    };
  
    errors = buildFromGitHub {
      version = 3;
      owner = "pkg";
  