handle_matcher

# File lib/spec/expectations/handler.rb, line 14
        def handle_matcher(actual, matcher, &block)
          if :use_operator_matcher == matcher
            return Spec::Matchers::PositiveOperatorMatcher.new(actual)
          end

          unless matcher.respond_to?(:matches?)
            raise InvalidMatcherError, "Expected a matcher, got #{matcher.inspect}."
          end
          
          match = matcher.matches?(actual, &block)
          ::Spec::Matchers.generated_description = "should #{describe_matcher(matcher)}"
          Spec::Expectations.fail_with(matcher.failure_message) unless match
        end