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