From: ToRA Date: 2006-01-02T20:17:57+09:00 Subject: Re: (Real) Primitive Ruby Generics support Hey, Well I'm a uni student (with a loose interest in type-theory) and its cropped up in some literature I'm reading. Usually under the guise of structural sub-typing and nominal sub-typing; I recall some discussion on Lambda-the-ultimate on whether structural subtyping == duck typing. (http://lambda-the-ultimate.org/node/view/1201) Also see the wikipedia article on subtype (http://en.wikipedia.org/wiki/Subtype), certainly in published papers in the typing area these terms come up. HTH, Regards, Tris.