anchor.diff:  , fetchPypi
   , jinja2
   , packaging
  +, pytest-aiohttp
  +, pytestCheckHook
   , pythonOlder
   , webargs
   }:
  
positive.code:     "aiohttp_apispec"
    ];
  
    # Requires pytest-sanic, currently broken in nixpkgs
    doCheck = false;
  
    meta = with lib; {
      description = "Build and document REST APIs with aiohttp and apispec";
      homepage = "https://github.com/maximdanilchenko/aiohttp-apispec/";
  
negative.code:     webargs
    ];
  
    checkInputs = [
      pytest-aiohttp
      pytestCheckHook
    ];
  
    postPatch = ''
      substituteInPlace requirements.txt \
        --replace "jinja2<3.0" "jinja2"
  