def handle_matcher(actual, matcher, &block)
::Spec::Matchers.last_should = "should not"
return Spec::Matchers::NegativeOperatorMatcher.new(actual) if matcher.nil?
unless matcher.respond_to?(:matches?)
raise InvalidMatcherError, "Expected a matcher, got #{matcher.inspect}."
end
unless matcher.respond_to?(:negative_failure_message)
Spec::Expectations.fail_with(
"Matcher does not support should_not.\nSee Spec::Matchers for more information\nabout matchers.\n"
)
end
match = matcher.matches?(actual, &block)
::Spec::Matchers.last_matcher = matcher
Spec::Expectations.fail_with(matcher.negative_failure_message) if match
match
end