anchor.diff:    # Delete this on next update; see #79975 for details
     legacyCargoFetcher = true;
   
  -  cargoSha256 = "185jnmyirfhrv8bxvmwizf3lvq49sjj1696g3gflph31d8bfpb0c";
  +  cargoSha256 = "0jxc8qsp5fasnh5cbg6yl9d878n7dppay9gzjndlb65kj9j43h84";
   
     nativeBuildInputs = [ nasm ];
   
  
positive.code: 
  rustPlatform.buildRustPackage rec {
    pname = "rav1e";
    version = "0.3.0";
  
    src = stdenv.mkDerivation rec {
      name = "${pname}-${version}-source";
  
negative.code:       owner = "xiph";
        repo = "rav1e";
        rev = "v${version}";
        sha256 = "001v29baa77pkab13d7imi71llixyvffqax8kgjwhm1dhsqlm7bl";
      };
      cargoLock = fetchurl {
        url = "https://github.com/xiph/rav1e/releases/download/v${version}/Cargo.lock";
        sha256 = "06l8jj75ma5kvz1m14x58an2zvx12i6wcq70gzq5k47nvj5l0zax";
      };
  
      installPhase = ''
  