anchor.diff:  , freezegun
   , pytest-asyncio
   }:
  +
   buildPythonPackage rec {
     pname = "cirq-core";
  -  version = "0.11.0";
  +  version = "0.12.0";
   
     disabled = pythonOlder "3.6";
   
  
positive.code: { stdenv
  , lib
  , buildPythonPackage
  , pythonOlder
  , fetchFromGitHub
  
negative.code:     substituteInPlace requirements.txt \
        --replace "matplotlib~=3.0" "matplotlib" \
        --replace "networkx~=2.4" "networkx" \
        --replace "numpy~=1.16" "numpy"
    '';
  
    propagatedBuildInputs = [
  