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{-# LANGUAGE UnboxedTuples, MagicHash, GADTs,
DataKinds, PolyKinds, ExplicitForAll #-}
module Main where
import GHC.Exts
data G a where
MkG :: G (TupleRep [LiftedRep, IntRep])
-- tests that we don't eta-expand functions that are levity-polymorphic
-- see CoreArity.mkEtaWW
foo :: forall a (b :: TYPE a). G a -> b -> b
foo MkG = (\x -> x) :: forall (c :: TYPE (TupleRep [LiftedRep, IntRep])). c -> c
data H a where
MkH :: H IntRep
-- tests that we don't push coercions that make args levity-polymorphic
-- see Simplify.simplCast
bar :: forall (r :: RuntimeRep) (a :: TYPE r). H r -> (a -> a -> (# a, a #)) -> a -> (# a, a #)
bar MkH = (\f x -> f x x) :: forall (b :: TYPE IntRep). (b -> b -> (# b, b #)) -> b -> (# b, b #)
main :: IO ()
main = do
let (# b, x #) = foo MkG (# True, 3# #)
print b
print (I# x)
let (# y, z #) = bar MkH (#,#) 8#
print (I# y)
print (I# z)
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