# File lib/rspec/mocks/serialization.rb, line 18
        def to_yaml(options = {})
          return nil if defined?(::Psych) && options.respond_to?(:[]) && options[:nodump]
          return super(options) unless instance_variable_defined?(:@mock_proxy)

          mp = @mock_proxy
          remove_instance_variable(:@mock_proxy)

          begin
            super(options)
          ensure
            @mock_proxy = mp
          end
        end