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|
module A (
) where
-- This reproduces the issue where type variables would be lifted out in
-- different orders. Compare:
--
-- lvl =
-- \ (@ (c :: * -> *)) (@ (t :: * -> *)) ->
-- undefined
-- @ ((forall d. Data d => c (t d))
-- -> Maybe (c Node))
-- (some Callstack thing)
--
-- $cdataCast1 =
-- \ (@ (c :: * -> *)) (@ (t :: * -> *)) _ [Occ=Dead] ->
-- lvl @ c @ t
--
-- vs
--
-- lvl =
-- \ (@ (t :: * -> *)) (@ (c :: * -> *)) ->
-- undefined
-- @ ((forall d. Data d => c (t d))
-- -> Maybe (c Node))
-- (some Callstack thing)
--
-- $cdataCast1 =
-- \ (@ (c :: * -> *)) (@ (t :: * -> *)) _ [Occ=Dead] ->
-- lvl @ t @ c
import Data.Data
data Node = Node (Maybe Int) [Node]
instance Data Node where
gfoldl = gfoldl
gunfold = gunfold
toConstr = toConstr
dataTypeOf = dataTypeOf
dataCast1 _ = undefined
dataCast2 = dataCast2
gmapT = gmapT
gmapQl = gmapQl
gmapQr = gmapQr
gmapQ = gmapQ
gmapQi = gmapQi
gmapM = gmapM
gmapMp = gmapMp
gmapMo = gmapMo
|
