anchor.diff:  { buildPythonPackage, fetchFromGitHub, lib, pythonOlder, pytest }:
  +
   buildPythonPackage rec {
     pname = "typed-ast";
     version = "1.5.0";
  +  disabled = pythonOlder "3.3";
  +
     src = fetchFromGitHub {
       owner = "python";
       repo = "typed_ast";
       rev = version;
       sha256 = "sha256-z3l5gMG1Jp6EI7SnGn5ABVXVBi+bK///iJBqEWn4d+s=";
     };
  -  # Only works with Python 3.3 and newer;
  -  disabled = pythonOlder "3.3";
   
     pythonImportsCheck = [
       "typed_ast"
  
positive.code:     runHook postCheck
    '';
  
    meta = {
      homepage = "https://github.com/python/typed_ast";
      description = "Python 2 and 3 ast modules with type comment support";
      license = lib.licenses.asl20;
    };
  }
  
negative.code:   checkInputs = [
      pytest
    ];
  
    checkPhase = ''
      runHook preCheck
  
  