anchor.diff:  let
     # Manually set version - the setup script requires
     # hg and git + keeping the .git directory around.
  -  version = "0.0.8";
  +  version = "0.0.10";
     versionFile = writeScript "version.ml" ''
       cat > "./version.ml" <<EOF
       let build_info () =
  
positive.code: 
    checkPhase = ''
      make test
    '';
  
    # Note that we're not installing the typeshed yet.
    # Improvement for a future version.
    installPhase = ''
      mkdir -p $out/bin
      cp _build/all/main.native $out/bin/pyre
    '';
  
    meta = with stdenv.lib; {
  
negative.code:     owner = "facebook";
      repo = "pyre-check";
      rev = "v${version}";
      sha256 = "17fk2izq434jsr8dfz828754356qdwa6zv0lbzm6z1kgq4jg7brv";
    };
  
    nativeBuildInputs = [ makeWrapper ];
  