anchor.diff:      pipInstallPhase
     '';
   
  -  installCheckInputs = [ pytestCheckHook numpy ];
     preCheck = ''
       export TESTDIR=$(mktemp -d)
  -    cp -r $TMP/$sourceRoot/tests $TESTDIR
  +    cp -r tests/ $TESTDIR
       pushd $TESTDIR
     '';
     postCheck = "popd";
  
positive.code: 
  rustPlatform.buildRustPackage rec {
    pname = "retworkx";
    version = "0.4.0";
  
    src = fetchFromGitHub {
      owner = "Qiskit";
      repo = "retworkx";
      rev = version;
      sha256 = "1xqp6d39apkjvd0ad9vw81cp2iqzhpagfa4p171xqm3bwfn2imdc";
    };
  
    cargoSha256 = "0bma0l14jv5qhcsxck7vw3ak1w3c8v84cq4hii86i4iqk523zns5";
    cargoPatches = [
        ( fetchpatch {
          name = "retworkx-cargo-lock.patch";
          url = "https://github.com/Qiskit/retworkx/commit/a02fd33d357a92dbe9530696a6d85aa59fe8a5b9.patch";
          sha256 = "0gvxr1nqp9ll4skfks4p4d964pshal25kb1nbfzhpyipnzddizr5";
        } )
    ];
  
    propagatedBuildInputs = [ python ];
  
    nativeBuildInputs = [ pipInstallHook maturin pip ];
  
    # Need to check AFTER python wheel is installed (b/c using Rust Build, not buildPythonPackage)
    doCheck = false;
    doInstallCheck = true;
  
    buildPhase = ''
      runHook preBuild
      maturin build --release --manylinux off --strip --interpreter ${python.interpreter}
      runHook postBuild
    '';
  
  
negative.code: { lib
  , rustPlatform
  , python
  , fetchFromGitHub
  , pipInstallHook
  , maturin
  