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Eta expand as required by simplified subsumption rules #4

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Eta expand as required by simplified subsumption rules #4

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6 changes: 3 additions & 3 deletions src/Control/Monad/Union.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -35,12 +35,12 @@ data UState s l = UState {

-- | Union find monad.
newtype UnionM l a = U {
runU :: (forall s . StateT (UState s l) (ST s) a)
runU :: forall s . StateT (UState s l) (ST s) a
}

instance Monad (UnionM l) where
return x = U (return x)
f >>= b = U (runU f >>= runU . b)
f >>= b = U (runU f >>= \v -> runU (b v))

instance Functor (UnionM l) where
fmap = liftM
Expand All @@ -50,7 +50,7 @@ instance Applicative (UnionM l) where
(<*>) = ap

instance MonadFix (UnionM l) where
mfix a = U (mfix (runU . a))
mfix a = U (mfix (\v -> runU (a v)))

-- | Run a union find computation.
run :: UnionM l a -> a
Expand Down