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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.
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)
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