Type checker plugins

[Barney Hilken]

Ok, I hadn't realised that. Looking in the user's guide, I see <= and <=? for Nat, but I couldn't find anything about Symbol. I must try them out!


> From: Carter Schonwald <carter.schonwald at gmail.com>
> 
> the alphabetical ordering on Symbol is already exposed via TypeLits... this would be some machinery to help maintain that ordering with less user intervention?
> 
> On Thu, Oct 16, 2014 at 6:59 PM, Barney Hilken <b.hilken at ntlworld.com> wrote:
> I can think of a use for a non-equality constraint: an alphabetical ordering on Symbol. This would allow experimental implementations of extensible records (without shadowing) which keep the labels sorted.
> 
> An order constraint on Nat might be useful, too.
> 
> Barney.
> 
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