anchor.diff:    passthru = {
       srcVerification = fetchurl {
         failEarly = true;
  -      pgpsigUrls = map (n: "${n}.asc") src.urls;
  -      pgpKeyFingerprint = "296D 6F29 A020 808E 8717  A884 2DB5 BD89 A340 AEB7";
  -      inherit (src) urls outputHash outputHashAlgo;
  +      inherit (src)
  +        urls
  +        outputHash
  +        outputHashAlgo;
  +      fullOpts = {
  +        pgpsigUrls = map (n: "${n}.asc") src.urls;
  +        pgpKeyFingerprint = "296D 6F29 A020 808E 8717  A884 2DB5 BD89 A340 AEB7";
  +      };
       };
     };
   
  
positive.code:   src = fetchurl {
      url = "https://github.com/strace/strace/releases/download/v${version}/${name}.tar.xz";
      hashOutput = false;
      sha256 = "1f4e59fc1edfa2bfb4adf2a748623dc25b105ec79713dd84404199f91b0b0634";
    };
  
    nativeBuildInputs = [
  
negative.code: }:
  
  let
    version = "4.25";
  in
  stdenv.mkDerivation rec {
    name = "strace-${version}";
  