# File lib/rspec/matchers/operator_matcher.rb, line 24
      def self.use_custom_matcher_or_delegate(operator)
        define_method(operator) do |expected|
          if matcher = OperatorMatcher.get(@actual.class, operator)
            @actual.send(::RSpec::Matchers.last_should, matcher.new(expected))
          else
            eval_match(@actual, operator, expected)
          end
        end

        negative_operator = operator.sub(/^=/, '!')
        if negative_operator != operator && respond_to?(negative_operator)
          define_method(negative_operator) do |expected|
            opposite_should = ::RSpec::Matchers.last_should == :should ? :should_not : :should
            raise "RSpec does not support `#{::RSpec::Matchers.last_should} #{negative_operator} expected`.  " +
                  "Use `#{opposite_should} #{operator} expected` instead."
          end
        end
      end