handle_matcher

# File lib/spec/expectations/handler.rb, line 27
      def self.handle_matcher(actual, matcher, message=nil, &block)
        ::Spec::Matchers.last_should = :should_not
        ::Spec::Matchers.last_matcher = matcher
        return ::Spec::Matchers::NegativeOperatorMatcher.new(actual) if matcher.nil?
        
        match = matcher.respond_to?(:does_not_match?) ?
                !matcher.does_not_match?(actual, &block) :
                matcher.matches?(actual, &block)
        return match unless match
        
        message ||= matcher.respond_to?(:failure_message_for_should_not) ?
                    matcher.failure_message_for_should_not :
                    matcher.negative_failure_message

        if matcher.respond_to?(:diffable?) && matcher.diffable?
          ::Spec::Expectations.fail_with message, matcher.expected.first, matcher.actual
        else
          ::Spec::Expectations.fail_with message
        end
      end