On Tue, 24 Jul 2001  09:04:25 +0900, Avi Bryant wrote:
[snip]
> Check out hipster's implementation at
> http://www.xs4all.nl/~hipster/lib/ruby/interface-abstract

Credits to Dave, see [ruby-talk:03538]

FYI: search for 'Interface polymorphism' on blade for more discussion.

        Michel