class RSpec::Mocks::MessageExpectation

def and_return(*values, &implementation)
  if negative?
    raise "`and_return` is not supported with negative message expectations"
  else
    @expected_received_count = [@expected_received_count, values.size].max unless ignoring_args? || (@expected_received_count == 0 and @at_least)
    if implementation
      # TODO: deprecate `and_return { value }`
      self.inner_implementation_action = implementation
    else
      self.terminal_implementation_action = AndReturnImplementation.new(values)
    end
    nil
  end
end