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{-# LANGUAGE Haskell2010 #-}
{-# LANGUAGE RankNTypes #-}
{-# OPTIONS_GHC -ddump-simpl-stats #-}
-- The rule foo/bar should fire
module Roman where
foo :: (forall m. m a -> m b) -> m a -> m b
{-# NOINLINE foo #-}
foo f = f
bar :: (forall m. m a -> m a) -> m a -> m a
bar f = f
{-# RULES "foo/bar" foo = bar #-}
blip = foo id
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