anchor.diff:  
   [extensions]
   purge =
  +robustcheckout = ${robustcheckout}/robustcheckout/__init__.py
   EOF
       '';
     });
  
positive.code: let
  
    inherit (releng_pkgs.lib) mkTaskclusterHook mkPython fromRequirementsFile filterSource mkRustPlatform;
    inherit (releng_pkgs.pkgs) writeScript makeWrapper mercurial cacert rustStable ;
    inherit (releng_pkgs.pkgs.lib) fileContents optional licenses;
    inherit (releng_pkgs.tools) pypi2nix;
  
  
negative.code:       ln -s ${rustStable.rustc}/bin/rustc $out/bin
        ln -s ${rustStable.cargo}/bin/cargo $out/bin
      '';
      shellHook = ''
        export PATH="${mercurial'}/bin:$PATH"
      '';
      passthru = {
        taskclusterHooks = {
          master = {
  