[m-dev.] typeclass examples

[David Glen JEFFERY]

> Hi,
> 
> A few people have asked me for some typeclass examples, so I've put a few
> in /home/mercury/dgj/typeclass

I've just changed all the examples use a slightly new syntax (the ":-" is
no longer necessary for methods inside the typeclass declaration).

The diff in the mail which follows this implements this syntax, but I guess
it won't get installed until tonight/tomorrow morning.


love and cuddles,
dgj
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