class RSpec::Mocks::AnyInstance::MessageChains

def raise_if_second_instance_to_receive_message(instance)
  @instance_with_expectation ||= instance if ExpectationChain === instance
  return unless ExpectationChain === instance
  return if @instance_with_expectation.equal?(instance)
  AnyInstance.error_generator.raise_second_instance_received_message_error(unfulfilled_expectations)
end