[m-dev.] proposal: user-defined equality predicates

[Fergus Henderson]

Tyson Richard DOWD, you wrote:
> > On Fri, 27 Jun 1997, Tyson Richard DOWD wrote:
> > 
> > > I thought standard equality was syntactic?
> > 
> > Functions put an end to that.
> 
> So did overloading.

Not really.  In a type-correct program with overloading, equality can
still be syntactic, so long as you don't have functions.
For example, `foo = foo' is always true, if type-correct;
overloading just introduces the possibility of ambiguity errors.

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