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  • { lib, buildPythonPackage, fetchPypi, pythonOlder, isPy3k, isPyPy, python }:
    
    let
      testDir = if isPy3k then "src" else "python2";
    
    in buildPythonPackage rec {
      pname = "typing";
      version = "3.6.6";
    
      src = fetchPypi {
        inherit pname version;
        sha256 = "sha256:0ba9acs4awx15bf9v3nrs781msbd2nx826906nj6fqks2bvca9s0";
      };
    
      # Error for Python3.6: ImportError: cannot import name 'ann_module'
      # See https://github.com/python/typing/pull/280
      # Also, don't bother on PyPy: AssertionError: TypeError not raised
      doCheck = pythonOlder "3.6" && !isPyPy;
    
      checkPhase = ''
        cd ${testDir}
        ${python.interpreter} -m unittest discover
      '';
    
      meta = with lib; {
        description = "Backport of typing module to Python versions older than 3.5";
        homepage = https://docs.python.org/3/library/typing.html;
        license = licenses.psfl;
      };
    }