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Not specifying a :responder shouldn't raise a warning or error #2
[errata] Passing an object as :responder is deprecated. It's recommended to pass a class name instead, which will be constantized and instantiated with no arguments.
It actually looks like :responder is supposed to be required, so this shouldn't work at all. But for simple errata I often don't need to define any special methods - so do we really need to always have a :responder?