[Nickle] Polymorphic equality and similar mysticism

Keith Packard keithp at keithp.com
Sun May 30 15:48:13 PDT 2004

Around 14 o'clock on May 30, Bart Massey wrote:

> and insist on subtype compatibility of the arguments: we
> select the unique equality operator, if any, such that
> one argument is of matching type and the other is of a
> supertype.  If there is none, it is a static type error.

That's either type-based function selection or parametric polymorphism.
Which is it?  How do we extend that to other functions?

I don't want a built-in specific kludge here...


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