class RSpec::Mocks::MessageExpectation

def and_call_original
  if RSpec::Mocks::TestDouble === @method_double.object
    @error_generator.raise_only_valid_on_a_partial_mock(:and_call_original)
  else
    if implementation.inner_action
      RSpec.warning("You're overriding a previous implementation for this stub")
    end
    @implementation = AndCallOriginalImplementation.new(@method_double.original_method)
    @yield_receiver_to_implementation_block = false
  end
end