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Go look at Eiffel (Score:1)
I know I keep saying this - but this _really_ reminds me of the way Eiffel puts things together (although they keep the class metaphor rather than calling them roles).
Re:Go look at Eiffel (Score:2)
Except that you still have MI (but with explicit method resolution) and you still can have behavior buried in inherited classes rather than explicitly stated in the preamble to your code (though I love that you must explicitly override them). Also, because it's class based, it's not as easy to share behavior amongst classes which are not structurally related -- one of the design goals of roles.
That being said, Eiffel looks really nice and if more than 3 people were using it ... ;)
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