# File lib/rspec/mocks/message_expectation.rb, line 328
      def at_least(n, &block)
        if n == 0
          RSpec.deprecate "at_least(0) with should_receive", :replacement => "stub"
        end

        self.inner_implementation_action = block
        set_expected_received_count :at_least, n
        self
      end