anchor.diff:      pyyaml
     ];
   
  -  checkInputs = with python3.pkgs; [
  +  checkInputs = with python.pkgs; [
       pytestCheckHook
     ];
   
  
positive.code: { lib, fetchFromGitHub, fetchpatch, python3 }:
  python3.pkgs.buildPythonApplication rec {
    pname = "heisenbridge";
    version = "1.13.1";
  
  
negative.code:     echo "${version}" > heisenbridge/version.txt
    '';
  
    propagatedBuildInputs = with python.pkgs; [
      aiohttp
      irc
      mautrix
  