keymonad's Issues
Quantify over the scope type variable (s) last
When you finalize the library, consider quantifying over the scope type variable s
last now that the order matters
newKey :: forall a s. KeyM s (Key s a)
newKey = KeyM $ \s -> Key (supplyName s)
This lets us write
-- CURRENT: newKey @_ @Int :: forall k (t :: k). KeyM t (Key t Int)
newKey @Int :: forall k (t :: k). KeyM t (Key t Int)
Testing heterogeneous equality
testEquality
compares two keys for equality that possibly have a different type, but it doesn't allow comparing Key s Int
and Key s Maybe
by producing a proof HRefl
-- this definition to go into Data.Type.Equality
data (a :: k1) :~~: (b :: k2) where
HRefl :: a :~~: a
testHEquality :: Key s a -> Key s b -> Maybe (a :~~: b)
Consider adding it when it when they get added to base.
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