lib/rspec/mocks/argument_expectation.rb in rspec-mocks-2.6.0 vs lib/rspec/mocks/argument_expectation.rb in rspec-mocks-2.7.0.rc1

@@ -24,10 +24,10 @@
         return ArgumentMatchers::RegexpMatcher.new(arg)  if arg.is_a?(Regexp)
         return ArgumentMatchers::EqualityProxy.new(arg)
       end
       
       def is_matcher?(obj)
-        !null_object?(obj) & obj.respond_to?(:matches?) & obj.respond_to?(:description)
+        !null_object?(obj) & obj.respond_to?(:matches?) & [:failure_message_for_should, :failure_message].any? { |m| obj.respond_to?(m) }
       end
 
       def args_match?(*args)
         match_any_args? || block_passes?(*args) || matchers_match?(*args)
       end