def METHOD_NAME(error_ffi_converter, call_status):
    if call_status.code == _UniffiRustCallStatus.CALL_SUCCESS:
        pass
    elif call_status.code == _UniffiRustCallStatus.CALL_ERROR:
        if error_ffi_converter is None:
            call_status.error_buf.free()
            raise InternalError("_rust_call_with_error: CALL_ERROR, but error_ffi_converter is None")
        else:
            raise error_ffi_converter.lift(call_status.error_buf)
    elif call_status.code == _UniffiRustCallStatus.CALL_PANIC:
        # When the rust code sees a panic, it tries to construct a _UniffiRustBuffer
        # with the message.  But if that code panics, then it just sends back
        # an empty buffer.
        if call_status.error_buf.len > 0:
            msg = _UniffiConverterString.lift(call_status.error_buf)
        else:
            msg = "Unknown rust panic"
        raise InternalError(msg)
    else:
        raise InternalError("Invalid _UniffiRustCallStatus code: {}".format(
            call_status.code))