12 Mar
2013
12 Mar
'13
9:26 a.m.
{-# LANGUAGE UndecidableInstances #-}
class OldConstraint a => NewtypedConstraint a
instance OldConstraint a => NewtypedConstraint a
perhaps?
Nice thing is you don't even need to do wrapping/unwrapping, like you do
with data newtypes.
On Tue, Mar 12, 2013 at 2:18 PM, Roman Cheplyaka
Is there a way to newtype a constraint?
Imagine a type class parameterised over constraints. What do I do if I want multiple instances for (essentially) the same constraint?
Roman
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