anchor.diff:  
     pytestFlagsArray = [
       "--ignore=dev_tools"  # Only needed when developing new code, which is out-of-scope
  +    "--ignore=cirq/contrib/"  # requires external (unpackaged) python packages, so untested.
       "--benchmark-disable" # Don't need to run benchmarks when packaging.
     ];
     disabledTests = [
  
positive.code:     # Seem to fail due to math issues on aarch64?
      "expectation_from_wavefunction"
      "test_single_qubit_op_to_framed_phase_form_output_on_example_case"
    ];
  
    meta = with lib; {
  
negative.code: 
  buildPythonPackage rec {
    pname = "cirq";
    version = "0.9.1";
  
    disabled = pythonOlder "3.6";
  
  