anchor.diff:        owner = "marco-c";
         repo = "grcov";
         rev = "v${version}";
  -      sha256 = "1b43pdi00bkpa7pii2hnasml208581ygmspqr7gpq186k7cil8x0";
  +      sha256 = "12lkzfh2iwxxyzy29rjjd6q3zvkpb6kw3v367xmckf1vabh7p3yp";
       };
   
   	# ...
  
positive.code:     # error: test failed, to rerun pass '--test test'
      doCheck = false;
  
      cargoSha256 = "06bpk9r9fqdwnm3s3n2z6gizhdnqdlhpy2f8drd62fmvr59kyypc";
  
      meta = with releng_pkgs.pkgs.stdenv.lib; {
        description = "grcov collects and aggregates code coverage information for multiple source files.";
  
negative.code: let
  
    inherit (releng_pkgs.lib) mkTaskclusterHook mkTaskclusterMergeEnv mkPython fromRequirementsFile filterSource mkRustPlatform;
    inherit (releng_pkgs.pkgs) writeScript makeWrapper fetchurl cacert git libxml2;
    inherit (releng_pkgs.pkgs.stdenv) mkDerivation;
    inherit (releng_pkgs.pkgs.lib) fileContents optional licenses;
    inherit (releng_pkgs.tools) pypi2nix mercurial ;
  