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{-# LANGUAGE TypeFamilies, TypeOperators, EmptyDataDecls #-}
module T4174 where
data True
data False
data Minor1
data GHC6'8 m
data GHC6'10 m
type family a :<=: b :: {-Bool-}*
type instance GHC6'10 m1 :<=: GHC6'8 m2 = False
type a :>=: b = b :<=: a
data Way ghcVersion tablesNextToCode profiling threaded
type family GHCVersion way :: {-GHCVersion-} *
type instance GHCVersion (Way v n p t) = v
type family Threaded way :: {-Bool-} *
type instance Threaded (Way v n p t) = t
data Field w s t
data SmStep
data RtsSpinLock
field :: String -> m (Field w a b)
field = undefined
type family WayOf (m :: * -> *) :: *
sync_large_objects :: (Monad m,
(GHCVersion (WayOf m) :>=: GHC6'10 Minor1) ~ True,
Threaded (WayOf m) ~ True)
=> m (Field (WayOf m) SmStep RtsSpinLock)
sync_large_objects = field "sync_large_objects"
testcase :: Monad m => m (Field (Way (GHC6'8 minor) n t p) a b)
testcase = sync_large_objects
{- Wanted constraints from the occurrence of sync_large_objects
(WayOf m) ~ (Way (GHC6'8 minor) n t p)
a ~ SmStep
b ~ RtsSpinLock
Threaded (WayOf m) ~ True
== Threaded (Way (GHC6'8 minor) n t p) ~ True
== p ~ True
(GHCVersion (WayOf m) :>=: GHC6'10 Minor1) ~ True,
== (GHC6'10 Minor1 :<=: GHCVersion (WayOf m)) ~ True,
== (GHC6'10 Minor1 :<=: GHCVersion (Way (GHC6'8 minor) n t p))) ~ True,
== (GHC6'10 Minor1 :<=: GHC6'8 minor) ~ True
== False ~ True
-}
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