anchor.diff:            ++ stdenv.lib.optional
                  (pythonPackages.pythonOlder "3.5")
                  pythonPackages.typing;
  -      }));
  +      });
   in pythonPackages.buildPythonPackage rec {
     name = "${pname}-${version}";
     pname = "gns3-server";
  
positive.code: 
  let
    pythonPackages = python36Packages;
    async-timeout = (stdenv.lib.overrideDerivation pythonPackages.async-timeout
      (oldAttrs:
        rec {
          pname = "async-timeout";
  
negative.code:           inherit pname version;
            sha256 = "1l3kg062m02mph6rf9rdv8r5c5n356clxa6b6mrn0i77vk9g9kq0";
          };
        });
    aiohttp = pythonPackages.aiohttp.overrideAttrs
      (oldAttrs:
        rec {
          pname = "aiohttp";
  