Hi.

I tried to design a simple plugin system using :extend called upon
instance (http://ruby-doc.org/core/classes/Object.html#M000335 usual
documented behavior), so as to inject some methods redefinitions while
keeping the ability to call super in order to fall back on the default
behavior if needed.

It looks like this: http://gist.github.com/339025
It works as expected, as one can see by reading the commented output at
the end of the file: the inheritance chain is altered, with the plugin
"subclassing" the original class of the plugin receiver.

Yet, I tried to introduce some modularity in the system, so I went for:
http://gist.github.com/339028
It fails but I don't understand why. The inheritance chain is not
altered.
I tried to use :include instead of :extend, which gives merely the same
behavior (overwriting instance methods), but this time the plugin module
is added as the parent of the original class within the inheritance
chain, so it is useless for the purpose ;)

I'll be glad if someone could give me a hint on this :)
Thank you!
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