DsMonad

Documentation

type DsM = TcRnIf DsGblEnv DsLclEnv

mapM :: Traversable t => forall (m :: * -> *) a b. Monad m => (a -> m b) -> t a -> m (t b)

Map each element of a structure to a monadic action, evaluate these actions from left to right, and collect the results. For a version that ignores the results see mapM_.

mapAndUnzipM :: Applicative m => (a -> m (b, c)) -> [a] -> m ([b], [c])

The mapAndUnzipM function maps its first argument over a list, returning the result as a pair of lists. This function is mainly used with complicated data structures or a state-transforming monad.

initDs :: HscEnv -> TcGblEnv -> DsM a -> IO (Messages, Maybe a)

Run a DsM action inside the IO monad.

initDsTc :: DsM a -> TcM a

Run a DsM action inside the TcM monad.

initTcDsForSolver :: TcM a -> DsM (Messages, Maybe a)

initDsWithModGuts :: HscEnv -> ModGuts -> DsM a -> IO (Messages, Maybe a)

Run a DsM action in the context of an existing ModGuts

fixDs :: (a -> DsM a) -> DsM a

foldlM :: Monad m => (a -> b -> m a) -> a -> [b] -> m a

Monadic version of foldl

foldrM :: Monad m => (b -> a -> m a) -> a -> [b] -> m a

Monadic version of foldr

whenGOptM :: GeneralFlag -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()

unsetGOptM :: GeneralFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a

unsetWOptM :: WarningFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a

xoptM :: Extension -> TcRnIf gbl lcl Bool

class Functor f => Applicative (f :: * -> *) where

A functor with application, providing operations to

• embed pure expressions (pure), and
• sequence computations and combine their results (<*> and liftA2).

A minimal complete definition must include implementations of pure and of either <*> or liftA2. If it defines both, then they must behave the same as their default definitions:

(<*>) = liftA2 id liftA2 f x y = f <$> x <*> y

Further, any definition must satisfy the following:

identity

pure id <*> v = v

composition

pure (.) <*> u <*> v <*> w = u <*> (v <*> w)

homomorphism

pure f <*> pure x = pure (f x)

interchange

u <*> pure y = pure ($ y) <*> u

The other methods have the following default definitions, which may be overridden with equivalent specialized implementations:

• u *> v = (id <$ u) <*> v

• u <* v = liftA2 const u v

As a consequence of these laws, the Functor instance for f will satisfy

• fmap f x = pure f <*> x

It may be useful to note that supposing

forall x y. p (q x y) = f x . g y

it follows from the above that

liftA2 p (liftA2 q u v) = liftA2 f u . liftA2 g v

If f is also a Monad, it should satisfy

• pure = return

• (<*>) = ap

(which implies that pure and <*> satisfy the applicative functor laws).

Minimal complete definition

pure, ((<*>) | liftA2)

Methods

pure :: a -> f a

Lift a value.

(<*>) :: f (a -> b) -> f a -> f b infixl 4

Sequential application.

A few functors support an implementation of <*> that is more efficient than the default one.

(*>) :: f a -> f b -> f b infixl 4

Sequence actions, discarding the value of the first argument.

(<*) :: f a -> f b -> f a infixl 4

Sequence actions, discarding the value of the second argument.

Instances

Applicative []

Since: 2.1

Methods

pure :: a -> [a]

(<*>) :: [a -> b] -> [a] -> [b]

liftA2 :: (a -> b -> c) -> [a] -> [b] -> [c]

(*>) :: [a] -> [b] -> [b]

(<*) :: [a] -> [b] -> [a]

Applicative Maybe

Since: 2.1

Methods

pure :: a -> Maybe a

(<*>) :: Maybe (a -> b) -> Maybe a -> Maybe b

liftA2 :: (a -> b -> c) -> Maybe a -> Maybe b -> Maybe c

(*>) :: Maybe a -> Maybe b -> Maybe b

(<*) :: Maybe a -> Maybe b -> Maybe a

Applicative IO

Since: 2.1

Methods

pure :: a -> IO a

(<*>) :: IO (a -> b) -> IO a -> IO b

liftA2 :: (a -> b -> c) -> IO a -> IO b -> IO c

(*>) :: IO a -> IO b -> IO b

(<*) :: IO a -> IO b -> IO a

Applicative Par1

Since: 4.9.0.0

Methods

pure :: a -> Par1 a

(<*>) :: Par1 (a -> b) -> Par1 a -> Par1 b

liftA2 :: (a -> b -> c) -> Par1 a -> Par1 b -> Par1 c

(*>) :: Par1 a -> Par1 b -> Par1 b

(<*) :: Par1 a -> Par1 b -> Par1 a

Applicative Q

Methods

pure :: a -> Q a

(<*>) :: Q (a -> b) -> Q a -> Q b

liftA2 :: (a -> b -> c) -> Q a -> Q b -> Q c

(*>) :: Q a -> Q b -> Q b

(<*) :: Q a -> Q b -> Q a

Applicative P

Since: 4.5.0.0

Methods

pure :: a -> P a

(<*>) :: P (a -> b) -> P a -> P b

liftA2 :: (a -> b -> c) -> P a -> P b -> P c

(*>) :: P a -> P b -> P b

(<*) :: P a -> P b -> P a

Applicative Complex

Since: 4.9.0.0

Methods

pure :: a -> Complex a

(<*>) :: Complex (a -> b) -> Complex a -> Complex b

liftA2 :: (a -> b -> c) -> Complex a -> Complex b -> Complex c

(*>) :: Complex a -> Complex b -> Complex b

(<*) :: Complex a -> Complex b -> Complex a

Applicative Min

Since: 4.9.0.0

Methods

pure :: a -> Min a

(<*>) :: Min (a -> b) -> Min a -> Min b

liftA2 :: (a -> b -> c) -> Min a -> Min b -> Min c

(*>) :: Min a -> Min b -> Min b

(<*) :: Min a -> Min b -> Min a

Applicative Max

Since: 4.9.0.0

Methods

pure :: a -> Max a

(<*>) :: Max (a -> b) -> Max a -> Max b

liftA2 :: (a -> b -> c) -> Max a -> Max b -> Max c

(*>) :: Max a -> Max b -> Max b

(<*) :: Max a -> Max b -> Max a

Applicative First

Since: 4.9.0.0

Methods

pure :: a -> First a

(<*>) :: First (a -> b) -> First a -> First b

liftA2 :: (a -> b -> c) -> First a -> First b -> First c

(*>) :: First a -> First b -> First b

(<*) :: First a -> First b -> First a

Applicative Last

Since: 4.9.0.0

Methods

pure :: a -> Last a

(<*>) :: Last (a -> b) -> Last a -> Last b

liftA2 :: (a -> b -> c) -> Last a -> Last b -> Last c

(*>) :: Last a -> Last b -> Last b

(<*) :: Last a -> Last b -> Last a

Applicative Option

Since: 4.9.0.0

Methods

pure :: a -> Option a

(<*>) :: Option (a -> b) -> Option a -> Option b

liftA2 :: (a -> b -> c) -> Option a -> Option b -> Option c

(*>) :: Option a -> Option b -> Option b

(<*) :: Option a -> Option b -> Option a

Applicative NonEmpty

Since: 4.9.0.0

Methods

pure :: a -> NonEmpty a

(<*>) :: NonEmpty (a -> b) -> NonEmpty a -> NonEmpty b

liftA2 :: (a -> b -> c) -> NonEmpty a -> NonEmpty b -> NonEmpty c

(*>) :: NonEmpty a -> NonEmpty b -> NonEmpty b

(<*) :: NonEmpty a -> NonEmpty b -> NonEmpty a

Applicative ZipList

f '<$>' 'ZipList' xs1 '<*>' ... '<*>' 'ZipList' xsN

ZipList (zipWithN f xs1 ... xsN)

where zipWithN refers to the zipWith function of the appropriate arity (zipWith, zipWith3, zipWith4, ...). For example:

(\a b c -> stimes c [a, b]) <$> ZipList "abcd" <*> ZipList "567" <*> ZipList [1..]
    = ZipList (zipWith3 (\a b c -> stimes c [a, b]) "abcd" "567" [1..])
    = ZipList {getZipList = ["a5","b6b6","c7c7c7"]}

Since: 2.1

Methods

pure :: a -> ZipList a

(<*>) :: ZipList (a -> b) -> ZipList a -> ZipList b

liftA2 :: (a -> b -> c) -> ZipList a -> ZipList b -> ZipList c

(*>) :: ZipList a -> ZipList b -> ZipList b

(<*) :: ZipList a -> ZipList b -> ZipList a

Applicative Identity

Since: 4.8.0.0

Methods

pure :: a -> Identity a

(<*>) :: Identity (a -> b) -> Identity a -> Identity b

liftA2 :: (a -> b -> c) -> Identity a -> Identity b -> Identity c

(*>) :: Identity a -> Identity b -> Identity b

(<*) :: Identity a -> Identity b -> Identity a

Applicative STM

Since: 4.8.0.0

Methods

pure :: a -> STM a

(<*>) :: STM (a -> b) -> STM a -> STM b

liftA2 :: (a -> b -> c) -> STM a -> STM b -> STM c

(*>) :: STM a -> STM b -> STM b

(<*) :: STM a -> STM b -> STM a

Applicative Dual

Since: 4.8.0.0

Methods

pure :: a -> Dual a

(<*>) :: Dual (a -> b) -> Dual a -> Dual b

liftA2 :: (a -> b -> c) -> Dual a -> Dual b -> Dual c

(*>) :: Dual a -> Dual b -> Dual b

(<*) :: Dual a -> Dual b -> Dual a

Applicative Sum

Since: 4.8.0.0

Methods

pure :: a -> Sum a

(<*>) :: Sum (a -> b) -> Sum a -> Sum b

liftA2 :: (a -> b -> c) -> Sum a -> Sum b -> Sum c

(*>) :: Sum a -> Sum b -> Sum b

(<*) :: Sum a -> Sum b -> Sum a

Applicative Product

Since: 4.8.0.0

Methods

pure :: a -> Product a

(<*>) :: Product (a -> b) -> Product a -> Product b

liftA2 :: (a -> b -> c) -> Product a -> Product b -> Product c

(*>) :: Product a -> Product b -> Product b

(<*) :: Product a -> Product b -> Product a

Applicative First

Methods

pure :: a -> First a

(<*>) :: First (a -> b) -> First a -> First b

liftA2 :: (a -> b -> c) -> First a -> First b -> First c

(*>) :: First a -> First b -> First b

(<*) :: First a -> First b -> First a

Applicative Last

Methods

pure :: a -> Last a

(<*>) :: Last (a -> b) -> Last a -> Last b

liftA2 :: (a -> b -> c) -> Last a -> Last b -> Last c

(*>) :: Last a -> Last b -> Last b

(<*) :: Last a -> Last b -> Last a

Applicative ReadPrec

Since: 4.6.0.0

Methods

pure :: a -> ReadPrec a

(<*>) :: ReadPrec (a -> b) -> ReadPrec a -> ReadPrec b

liftA2 :: (a -> b -> c) -> ReadPrec a -> ReadPrec b -> ReadPrec c

(*>) :: ReadPrec a -> ReadPrec b -> ReadPrec b

(<*) :: ReadPrec a -> ReadPrec b -> ReadPrec a

Applicative ReadP

Since: 4.6.0.0

Methods

pure :: a -> ReadP a

(<*>) :: ReadP (a -> b) -> ReadP a -> ReadP b

liftA2 :: (a -> b -> c) -> ReadP a -> ReadP b -> ReadP c

(*>) :: ReadP a -> ReadP b -> ReadP b

(<*) :: ReadP a -> ReadP b -> ReadP a

Applicative PutM

Methods

pure :: a -> PutM a

(<*>) :: PutM (a -> b) -> PutM a -> PutM b

liftA2 :: (a -> b -> c) -> PutM a -> PutM b -> PutM c

(*>) :: PutM a -> PutM b -> PutM b

(<*) :: PutM a -> PutM b -> PutM a

Applicative Get

Methods

pure :: a -> Get a

(<*>) :: Get (a -> b) -> Get a -> Get b

liftA2 :: (a -> b -> c) -> Get a -> Get b -> Get c

(*>) :: Get a -> Get b -> Get b

(<*) :: Get a -> Get b -> Get a

Applicative Put

Methods

pure :: a -> Put a

(<*>) :: Put (a -> b) -> Put a -> Put b

liftA2 :: (a -> b -> c) -> Put a -> Put b -> Put c

(*>) :: Put a -> Put b -> Put b

(<*) :: Put a -> Put b -> Put a

Applicative Tree

Methods

pure :: a -> Tree a

(<*>) :: Tree (a -> b) -> Tree a -> Tree b

liftA2 :: (a -> b -> c) -> Tree a -> Tree b -> Tree c

(*>) :: Tree a -> Tree b -> Tree b

(<*) :: Tree a -> Tree b -> Tree a

Applicative Seq

Methods

pure :: a -> Seq a

(<*>) :: Seq (a -> b) -> Seq a -> Seq b

liftA2 :: (a -> b -> c) -> Seq a -> Seq b -> Seq c

(*>) :: Seq a -> Seq b -> Seq b

(<*) :: Seq a -> Seq b -> Seq a

Applicative VM

Methods

pure :: a -> VM a

(<*>) :: VM (a -> b) -> VM a -> VM b

liftA2 :: (a -> b -> c) -> VM a -> VM b -> VM c

(*>) :: VM a -> VM b -> VM b

(<*) :: VM a -> VM b -> VM a

Applicative SimpleUniqueMonad

Methods

pure :: a -> SimpleUniqueMonad a

(<*>) :: SimpleUniqueMonad (a -> b) -> SimpleUniqueMonad a -> SimpleUniqueMonad b

liftA2 :: (a -> b -> c) -> SimpleUniqueMonad a -> SimpleUniqueMonad b -> SimpleUniqueMonad c

(*>) :: SimpleUniqueMonad a -> SimpleUniqueMonad b -> SimpleUniqueMonad b

(<*) :: SimpleUniqueMonad a -> SimpleUniqueMonad b -> SimpleUniqueMonad a

Applicative Capability

Methods

pure :: a -> Capability a

(<*>) :: Capability (a -> b) -> Capability a -> Capability b

liftA2 :: (a -> b -> c) -> Capability a -> Capability b -> Capability c

(*>) :: Capability a -> Capability b -> Capability b

(<*) :: Capability a -> Capability b -> Capability a

Applicative Pair

Methods

pure :: a -> Pair a

(<*>) :: Pair (a -> b) -> Pair a -> Pair b

liftA2 :: (a -> b -> c) -> Pair a -> Pair b -> Pair c

(*>) :: Pair a -> Pair b -> Pair b

(<*) :: Pair a -> Pair b -> Pair a

Applicative UniqSM

Methods

pure :: a -> UniqSM a

(<*>) :: UniqSM (a -> b) -> UniqSM a -> UniqSM b

liftA2 :: (a -> b -> c) -> UniqSM a -> UniqSM b -> UniqSM c

(*>) :: UniqSM a -> UniqSM b -> UniqSM b

(<*) :: UniqSM a -> UniqSM b -> UniqSM a

Applicative P

Methods

pure :: a -> P a

(<*>) :: P (a -> b) -> P a -> P b

liftA2 :: (a -> b -> c) -> P a -> P b -> P c

(*>) :: P a -> P b -> P b

(<*) :: P a -> P b -> P a

Applicative PD

Methods

pure :: a -> PD a

(<*>) :: PD (a -> b) -> PD a -> PD b

liftA2 :: (a -> b -> c) -> PD a -> PD b -> PD c

(*>) :: PD a -> PD b -> PD b

(<*) :: PD a -> PD b -> PD a

Applicative UnifyResultM

Methods

pure :: a -> UnifyResultM a

(<*>) :: UnifyResultM (a -> b) -> UnifyResultM a -> UnifyResultM b

liftA2 :: (a -> b -> c) -> UnifyResultM a -> UnifyResultM b -> UnifyResultM c

(*>) :: UnifyResultM a -> UnifyResultM b -> UnifyResultM b

(<*) :: UnifyResultM a -> UnifyResultM b -> UnifyResultM a

Applicative LlvmM

Methods

pure :: a -> LlvmM a

(<*>) :: LlvmM (a -> b) -> LlvmM a -> LlvmM b

liftA2 :: (a -> b -> c) -> LlvmM a -> LlvmM b -> LlvmM c

(*>) :: LlvmM a -> LlvmM b -> LlvmM b

(<*) :: LlvmM a -> LlvmM b -> LlvmM a

Applicative FCode

Methods

pure :: a -> FCode a

(<*>) :: FCode (a -> b) -> FCode a -> FCode b

liftA2 :: (a -> b -> c) -> FCode a -> FCode b -> FCode c

(*>) :: FCode a -> FCode b -> FCode b

(<*) :: FCode a -> FCode b -> FCode a

Applicative CmmParse

Methods

pure :: a -> CmmParse a

(<*>) :: CmmParse (a -> b) -> CmmParse a -> CmmParse b

liftA2 :: (a -> b -> c) -> CmmParse a -> CmmParse b -> CmmParse c

(*>) :: CmmParse a -> CmmParse b -> CmmParse b

(<*) :: CmmParse a -> CmmParse b -> CmmParse a

Applicative Hsc

Methods

pure :: a -> Hsc a

(<*>) :: Hsc (a -> b) -> Hsc a -> Hsc b

liftA2 :: (a -> b -> c) -> Hsc a -> Hsc b -> Hsc c

(*>) :: Hsc a -> Hsc b -> Hsc b

(<*) :: Hsc a -> Hsc b -> Hsc a

Applicative TcPluginM

Methods

pure :: a -> TcPluginM a

(<*>) :: TcPluginM (a -> b) -> TcPluginM a -> TcPluginM b

liftA2 :: (a -> b -> c) -> TcPluginM a -> TcPluginM b -> TcPluginM c

(*>) :: TcPluginM a -> TcPluginM b -> TcPluginM b

(<*) :: TcPluginM a -> TcPluginM b -> TcPluginM a

Applicative CompPipeline

Methods

pure :: a -> CompPipeline a

(<*>) :: CompPipeline (a -> b) -> CompPipeline a -> CompPipeline b

liftA2 :: (a -> b -> c) -> CompPipeline a -> CompPipeline b -> CompPipeline c

(*>) :: CompPipeline a -> CompPipeline b -> CompPipeline b

(<*) :: CompPipeline a -> CompPipeline b -> CompPipeline a

Applicative Ghc

Methods

pure :: a -> Ghc a

(<*>) :: Ghc (a -> b) -> Ghc a -> Ghc b

liftA2 :: (a -> b -> c) -> Ghc a -> Ghc b -> Ghc c

(*>) :: Ghc a -> Ghc b -> Ghc b

(<*) :: Ghc a -> Ghc b -> Ghc a

Applicative CoreM

Methods

pure :: a -> CoreM a

(<*>) :: CoreM (a -> b) -> CoreM a -> CoreM b

liftA2 :: (a -> b -> c) -> CoreM a -> CoreM b -> CoreM c

(*>) :: CoreM a -> CoreM b -> CoreM b

(<*) :: CoreM a -> CoreM b -> CoreM a

Applicative SimplM

Methods

pure :: a -> SimplM a

(<*>) :: SimplM (a -> b) -> SimplM a -> SimplM b

liftA2 :: (a -> b -> c) -> SimplM a -> SimplM b -> SimplM c

(*>) :: SimplM a -> SimplM b -> SimplM b

(<*) :: SimplM a -> SimplM b -> SimplM a

Applicative CpsRn

Methods

pure :: a -> CpsRn a

(<*>) :: CpsRn (a -> b) -> CpsRn a -> CpsRn b

liftA2 :: (a -> b -> c) -> CpsRn a -> CpsRn b -> CpsRn c

(*>) :: CpsRn a -> CpsRn b -> CpsRn b

(<*) :: CpsRn a -> CpsRn b -> CpsRn a

Applicative OccCheckResult

Methods

pure :: a -> OccCheckResult a

(<*>) :: OccCheckResult (a -> b) -> OccCheckResult a -> OccCheckResult b

liftA2 :: (a -> b -> c) -> OccCheckResult a -> OccCheckResult b -> OccCheckResult c

(*>) :: OccCheckResult a -> OccCheckResult b -> OccCheckResult b

(<*) :: OccCheckResult a -> OccCheckResult b -> OccCheckResult a

Applicative TcS

Methods

pure :: a -> TcS a

(<*>) :: TcS (a -> b) -> TcS a -> TcS b

liftA2 :: (a -> b -> c) -> TcS a -> TcS b -> TcS c

(*>) :: TcS a -> TcS b -> TcS b

(<*) :: TcS a -> TcS b -> TcS a

Applicative VM

Methods

pure :: a -> VM a

(<*>) :: VM (a -> b) -> VM a -> VM b

liftA2 :: (a -> b -> c) -> VM a -> VM b -> VM c

(*>) :: VM a -> VM b -> VM b

(<*) :: VM a -> VM b -> VM a

Applicative NatM

Methods

pure :: a -> NatM a

(<*>) :: NatM (a -> b) -> NatM a -> NatM b

liftA2 :: (a -> b -> c) -> NatM a -> NatM b -> NatM c

(*>) :: NatM a -> NatM b -> NatM b

(<*) :: NatM a -> NatM b -> NatM a

Applicative (Either e)

Since: 3.0

Methods

pure :: a -> Either e a

(<*>) :: Either e (a -> b) -> Either e a -> Either e b

liftA2 :: (a -> b -> c) -> Either e a -> Either e b -> Either e c

(*>) :: Either e a -> Either e b -> Either e b

(<*) :: Either e a -> Either e b -> Either e a

Applicative (U1 *)

Since: 4.9.0.0

Methods

pure :: a -> U1 * a

(<*>) :: U1 * (a -> b) -> U1 * a -> U1 * b

liftA2 :: (a -> b -> c) -> U1 * a -> U1 * b -> U1 * c

(*>) :: U1 * a -> U1 * b -> U1 * b

(<*) :: U1 * a -> U1 * b -> U1 * a

Monoid a => Applicative ((,) a)

For tuples, the Monoid constraint on a determines how the first values merge. For example, Strings concatenate:

("hello ", (+15)) <*> ("world!", 2002)
("hello world!",2017)

Since: 2.1

Methods

pure :: a -> (a, a)

(<*>) :: (a, a -> b) -> (a, a) -> (a, b)

liftA2 :: (a -> b -> c) -> (a, a) -> (a, b) -> (a, c)

(*>) :: (a, a) -> (a, b) -> (a, b)

(<*) :: (a, a) -> (a, b) -> (a, a)

Applicative (ST s)

Since: 4.4.0.0

Methods

pure :: a -> ST s a

(<*>) :: ST s (a -> b) -> ST s a -> ST s b

liftA2 :: (a -> b -> c) -> ST s a -> ST s b -> ST s c

(*>) :: ST s a -> ST s b -> ST s b

(<*) :: ST s a -> ST s b -> ST s a

Monad m => Applicative (WrappedMonad m)

Since: 2.1

Methods

pure :: a -> WrappedMonad m a

(<*>) :: WrappedMonad m (a -> b) -> WrappedMonad m a -> WrappedMonad m b

liftA2 :: (a -> b -> c) -> WrappedMonad m a -> WrappedMonad m b -> WrappedMonad m c

(*>) :: WrappedMonad m a -> WrappedMonad m b -> WrappedMonad m b

(<*) :: WrappedMonad m a -> WrappedMonad m b -> WrappedMonad m a

Arrow a => Applicative (ArrowMonad a)

Since: 4.6.0.0

Methods

pure :: a -> ArrowMonad a a

(<*>) :: ArrowMonad a (a -> b) -> ArrowMonad a a -> ArrowMonad a b

liftA2 :: (a -> b -> c) -> ArrowMonad a a -> ArrowMonad a b -> ArrowMonad a c

(*>) :: ArrowMonad a a -> ArrowMonad a b -> ArrowMonad a b

(<*) :: ArrowMonad a a -> ArrowMonad a b -> ArrowMonad a a

Applicative (Proxy *)

Since: 4.7.0.0

Methods

pure :: a -> Proxy * a

(<*>) :: Proxy * (a -> b) -> Proxy * a -> Proxy * b

liftA2 :: (a -> b -> c) -> Proxy * a -> Proxy * b -> Proxy * c

(*>) :: Proxy * a -> Proxy * b -> Proxy * b

(<*) :: Proxy * a -> Proxy * b -> Proxy * a

Applicative (SetM s)

Methods

pure :: a -> SetM s a

(<*>) :: SetM s (a -> b) -> SetM s a -> SetM s b

liftA2 :: (a -> b -> c) -> SetM s a -> SetM s b -> SetM s c

(*>) :: SetM s a -> SetM s b -> SetM s b

(<*) :: SetM s a -> SetM s b -> SetM s a

Applicative (State s)

Methods

pure :: a -> State s a

(<*>) :: State s (a -> b) -> State s a -> State s b

liftA2 :: (a -> b -> c) -> State s a -> State s b -> State s c

(*>) :: State s a -> State s b -> State s b

(<*) :: State s a -> State s b -> State s a

Monad m => Applicative (CheckingFuelMonad m)

Methods

pure :: a -> CheckingFuelMonad m a

(<*>) :: CheckingFuelMonad m (a -> b) -> CheckingFuelMonad m a -> CheckingFuelMonad m b

liftA2 :: (a -> b -> c) -> CheckingFuelMonad m a -> CheckingFuelMonad m b -> CheckingFuelMonad m c

(*>) :: CheckingFuelMonad m a -> CheckingFuelMonad m b -> CheckingFuelMonad m b

(<*) :: CheckingFuelMonad m a -> CheckingFuelMonad m b -> CheckingFuelMonad m a

Monad m => Applicative (InfiniteFuelMonad m)

Methods

pure :: a -> InfiniteFuelMonad m a

(<*>) :: InfiniteFuelMonad m (a -> b) -> InfiniteFuelMonad m a -> InfiniteFuelMonad m b

liftA2 :: (a -> b -> c) -> InfiniteFuelMonad m a -> InfiniteFuelMonad m b -> InfiniteFuelMonad m c

(*>) :: InfiniteFuelMonad m a -> InfiniteFuelMonad m b -> InfiniteFuelMonad m b

(<*) :: InfiniteFuelMonad m a -> InfiniteFuelMonad m b -> InfiniteFuelMonad m a

Monad m => Applicative (UniqueMonadT m)

Methods

pure :: a -> UniqueMonadT m a

(<*>) :: UniqueMonadT m (a -> b) -> UniqueMonadT m a -> UniqueMonadT m b

liftA2 :: (a -> b -> c) -> UniqueMonadT m a -> UniqueMonadT m b -> UniqueMonadT m c

(*>) :: UniqueMonadT m a -> UniqueMonadT m b -> UniqueMonadT m b

(<*) :: UniqueMonadT m a -> UniqueMonadT m b -> UniqueMonadT m a

(Functor m, Monad m) => Applicative (MaybeT m)

Methods

pure :: a -> MaybeT m a

(<*>) :: MaybeT m (a -> b) -> MaybeT m a -> MaybeT m b

liftA2 :: (a -> b -> c) -> MaybeT m a -> MaybeT m b -> MaybeT m c

(*>) :: MaybeT m a -> MaybeT m b -> MaybeT m b

(<*) :: MaybeT m a -> MaybeT m b -> MaybeT m a

Applicative (ListT f)

Methods

pure :: a -> ListT f a

(<*>) :: ListT f (a -> b) -> ListT f a -> ListT f b

liftA2 :: (a -> b -> c) -> ListT f a -> ListT f b -> ListT f c

(*>) :: ListT f a -> ListT f b -> ListT f b

(<*) :: ListT f a -> ListT f b -> ListT f a

Applicative (State s)

Methods

pure :: a -> State s a

(<*>) :: State s (a -> b) -> State s a -> State s b

liftA2 :: (a -> b -> c) -> State s a -> State s b -> State s c

(*>) :: State s a -> State s b -> State s b

(<*) :: State s a -> State s b -> State s a

Applicative (MaybeErr err)

Methods

pure :: a -> MaybeErr err a

(<*>) :: MaybeErr err (a -> b) -> MaybeErr err a -> MaybeErr err b

liftA2 :: (a -> b -> c) -> MaybeErr err a -> MaybeErr err b -> MaybeErr err c

(*>) :: MaybeErr err a -> MaybeErr err b -> MaybeErr err b

(<*) :: MaybeErr err a -> MaybeErr err b -> MaybeErr err a

Applicative (CmdLineP s)

Methods

pure :: a -> CmdLineP s a

(<*>) :: CmdLineP s (a -> b) -> CmdLineP s a -> CmdLineP s b

liftA2 :: (a -> b -> c) -> CmdLineP s a -> CmdLineP s b -> CmdLineP s c

(*>) :: CmdLineP s a -> CmdLineP s b -> CmdLineP s b

(<*) :: CmdLineP s a -> CmdLineP s b -> CmdLineP s a

Monad m => Applicative (EwM m)

Methods

pure :: a -> EwM m a

(<*>) :: EwM m (a -> b) -> EwM m a -> EwM m b

liftA2 :: (a -> b -> c) -> EwM m a -> EwM m b -> EwM m c

(*>) :: EwM m a -> EwM m b -> EwM m b

(<*) :: EwM m a -> EwM m b -> EwM m a

Applicative (IOEnv m)

Methods

pure :: a -> IOEnv m a

(<*>) :: IOEnv m (a -> b) -> IOEnv m a -> IOEnv m b

liftA2 :: (a -> b -> c) -> IOEnv m a -> IOEnv m b -> IOEnv m c

(*>) :: IOEnv m a -> IOEnv m b -> IOEnv m b

(<*) :: IOEnv m a -> IOEnv m b -> IOEnv m a

Applicative (RegM freeRegs)

Methods

pure :: a -> RegM freeRegs a

(<*>) :: RegM freeRegs (a -> b) -> RegM freeRegs a -> RegM freeRegs b

liftA2 :: (a -> b -> c) -> RegM freeRegs a -> RegM freeRegs b -> RegM freeRegs c

(*>) :: RegM freeRegs a -> RegM freeRegs b -> RegM freeRegs b

(<*) :: RegM freeRegs a -> RegM freeRegs b -> RegM freeRegs a

Applicative m => Applicative (GhcT m)

Methods

pure :: a -> GhcT m a

(<*>) :: GhcT m (a -> b) -> GhcT m a -> GhcT m b

liftA2 :: (a -> b -> c) -> GhcT m a -> GhcT m b -> GhcT m c

(*>) :: GhcT m a -> GhcT m b -> GhcT m b

(<*) :: GhcT m a -> GhcT m b -> GhcT m a

Applicative f => Applicative (Rec1 * f)

Since: 4.9.0.0

Methods

pure :: a -> Rec1 * f a

(<*>) :: Rec1 * f (a -> b) -> Rec1 * f a -> Rec1 * f b

liftA2 :: (a -> b -> c) -> Rec1 * f a -> Rec1 * f b -> Rec1 * f c

(*>) :: Rec1 * f a -> Rec1 * f b -> Rec1 * f b

(<*) :: Rec1 * f a -> Rec1 * f b -> Rec1 * f a

Arrow a => Applicative (WrappedArrow a b)

Since: 2.1

Methods

pure :: a -> WrappedArrow a b a

(<*>) :: WrappedArrow a b (a -> b) -> WrappedArrow a b a -> WrappedArrow a b b

liftA2 :: (a -> b -> c) -> WrappedArrow a b a -> WrappedArrow a b b -> WrappedArrow a b c

(*>) :: WrappedArrow a b a -> WrappedArrow a b b -> WrappedArrow a b b

(<*) :: WrappedArrow a b a -> WrappedArrow a b b -> WrappedArrow a b a

Monoid m => Applicative (Const * m)

Since: 2.0.1

Methods

pure :: a -> Const * m a

(<*>) :: Const * m (a -> b) -> Const * m a -> Const * m b

liftA2 :: (a -> b -> c) -> Const * m a -> Const * m b -> Const * m c

(*>) :: Const * m a -> Const * m b -> Const * m b

(<*) :: Const * m a -> Const * m b -> Const * m a

Applicative f => Applicative (Alt * f)

Methods

pure :: a -> Alt * f a

(<*>) :: Alt * f (a -> b) -> Alt * f a -> Alt * f b

liftA2 :: (a -> b -> c) -> Alt * f a -> Alt * f b -> Alt * f c

(*>) :: Alt * f a -> Alt * f b -> Alt * f b

(<*) :: Alt * f a -> Alt * f b -> Alt * f a

(Applicative f, Monad f) => Applicative (WhenMissing f x)

Equivalent to ReaderT k (ReaderT x (MaybeT f)).

Methods

pure :: a -> WhenMissing f x a

(<*>) :: WhenMissing f x (a -> b) -> WhenMissing f x a -> WhenMissing f x b

liftA2 :: (a -> b -> c) -> WhenMissing f x a -> WhenMissing f x b -> WhenMissing f x c

(*>) :: WhenMissing f x a -> WhenMissing f x b -> WhenMissing f x b

(<*) :: WhenMissing f x a -> WhenMissing f x b -> WhenMissing f x a

(Monoid w, Applicative m) => Applicative (WriterT w m)

Methods

pure :: a -> WriterT w m a

(<*>) :: WriterT w m (a -> b) -> WriterT w m a -> WriterT w m b

liftA2 :: (a -> b -> c) -> WriterT w m a -> WriterT w m b -> WriterT w m c

(*>) :: WriterT w m a -> WriterT w m b -> WriterT w m b

(<*) :: WriterT w m a -> WriterT w m b -> WriterT w m a

(Functor m, Monad m) => Applicative (StateT s m)

Methods

pure :: a -> StateT s m a

(<*>) :: StateT s m (a -> b) -> StateT s m a -> StateT s m b

liftA2 :: (a -> b -> c) -> StateT s m a -> StateT s m b -> StateT s m c

(*>) :: StateT s m a -> StateT s m b -> StateT s m b

(<*) :: StateT s m a -> StateT s m b -> StateT s m a

(Functor m, Monad m) => Applicative (StateT s m)

Methods

pure :: a -> StateT s m a

(<*>) :: StateT s m (a -> b) -> StateT s m a -> StateT s m b

liftA2 :: (a -> b -> c) -> StateT s m a -> StateT s m b -> StateT s m c

(*>) :: StateT s m a -> StateT s m b -> StateT s m b

(<*) :: StateT s m a -> StateT s m b -> StateT s m a

(Functor m, Monad m) => Applicative (ExceptT e m)

Methods

pure :: a -> ExceptT e m a

(<*>) :: ExceptT e m (a -> b) -> ExceptT e m a -> ExceptT e m b

liftA2 :: (a -> b -> c) -> ExceptT e m a -> ExceptT e m b -> ExceptT e m c

(*>) :: ExceptT e m a -> ExceptT e m b -> ExceptT e m b

(<*) :: ExceptT e m a -> ExceptT e m b -> ExceptT e m a

Monad m => Applicative (Stream m a)

Methods

pure :: a -> Stream m a a

(<*>) :: Stream m a (a -> b) -> Stream m a a -> Stream m a b

liftA2 :: (a -> b -> c) -> Stream m a a -> Stream m a b -> Stream m a c

(*>) :: Stream m a a -> Stream m a b -> Stream m a b

(<*) :: Stream m a a -> Stream m a b -> Stream m a a

Applicative ((->) LiftedRep LiftedRep a)

Since: 2.1

Methods

pure :: a -> (LiftedRep -> LiftedRep) a a

(<*>) :: (LiftedRep -> LiftedRep) a (a -> b) -> (LiftedRep -> LiftedRep) a a -> (LiftedRep -> LiftedRep) a b

liftA2 :: (a -> b -> c) -> (LiftedRep -> LiftedRep) a a -> (LiftedRep -> LiftedRep) a b -> (LiftedRep -> LiftedRep) a c

(*>) :: (LiftedRep -> LiftedRep) a a -> (LiftedRep -> LiftedRep) a b -> (LiftedRep -> LiftedRep) a b

(<*) :: (LiftedRep -> LiftedRep) a a -> (LiftedRep -> LiftedRep) a b -> (LiftedRep -> LiftedRep) a a

(Applicative f, Applicative g) => Applicative ((:*:) * f g)

Since: 4.9.0.0

Methods

pure :: a -> (* :*: f) g a

(<*>) :: (* :*: f) g (a -> b) -> (* :*: f) g a -> (* :*: f) g b

liftA2 :: (a -> b -> c) -> (* :*: f) g a -> (* :*: f) g b -> (* :*: f) g c

(*>) :: (* :*: f) g a -> (* :*: f) g b -> (* :*: f) g b

(<*) :: (* :*: f) g a -> (* :*: f) g b -> (* :*: f) g a

(Monad f, Applicative f) => Applicative (WhenMatched f x y)

Equivalent to ReaderT Key (ReaderT x (ReaderT y (MaybeT f)))

Methods

pure :: a -> WhenMatched f x y a

(<*>) :: WhenMatched f x y (a -> b) -> WhenMatched f x y a -> WhenMatched f x y b

liftA2 :: (a -> b -> c) -> WhenMatched f x y a -> WhenMatched f x y b -> WhenMatched f x y c

(*>) :: WhenMatched f x y a -> WhenMatched f x y b -> WhenMatched f x y b

(<*) :: WhenMatched f x y a -> WhenMatched f x y b -> WhenMatched f x y a

(Applicative f, Monad f) => Applicative (WhenMissing f k x)

Equivalent to ReaderT k (ReaderT x (MaybeT f)) .

Methods

pure :: a -> WhenMissing f k x a

(<*>) :: WhenMissing f k x (a -> b) -> WhenMissing f k x a -> WhenMissing f k x b

liftA2 :: (a -> b -> c) -> WhenMissing f k x a -> WhenMissing f k x b -> WhenMissing f k x c

(*>) :: WhenMissing f k x a -> WhenMissing f k x b -> WhenMissing f k x b

(<*) :: WhenMissing f k x a -> WhenMissing f k x b -> WhenMissing f k x a

Applicative m => Applicative (ReaderT * r m)

Methods

pure :: a -> ReaderT * r m a

(<*>) :: ReaderT * r m (a -> b) -> ReaderT * r m a -> ReaderT * r m b

liftA2 :: (a -> b -> c) -> ReaderT * r m a -> ReaderT * r m b -> ReaderT * r m c

(*>) :: ReaderT * r m a -> ReaderT * r m b -> ReaderT * r m b

(<*) :: ReaderT * r m a -> ReaderT * r m b -> ReaderT * r m a

Applicative f => Applicative (M1 * i c f)

Since: 4.9.0.0

Methods

pure :: a -> M1 * i c f a

(<*>) :: M1 * i c f (a -> b) -> M1 * i c f a -> M1 * i c f b

liftA2 :: (a -> b -> c) -> M1 * i c f a -> M1 * i c f b -> M1 * i c f c

(*>) :: M1 * i c f a -> M1 * i c f b -> M1 * i c f b

(<*) :: M1 * i c f a -> M1 * i c f b -> M1 * i c f a

(Applicative f, Applicative g) => Applicative ((:.:) * * f g)

Since: 4.9.0.0

Methods

pure :: a -> (* :.: *) f g a

(<*>) :: (* :.: *) f g (a -> b) -> (* :.: *) f g a -> (* :.: *) f g b

liftA2 :: (a -> b -> c) -> (* :.: *) f g a -> (* :.: *) f g b -> (* :.: *) f g c

(*>) :: (* :.: *) f g a -> (* :.: *) f g b -> (* :.: *) f g b

(<*) :: (* :.: *) f g a -> (* :.: *) f g b -> (* :.: *) f g a

(Monad f, Applicative f) => Applicative (WhenMatched f k x y)

Equivalent to ReaderT k (ReaderT x (ReaderT y (MaybeT f)))

Methods

pure :: a -> WhenMatched f k x y a

(<*>) :: WhenMatched f k x y (a -> b) -> WhenMatched f k x y a -> WhenMatched f k x y b

liftA2 :: (a -> b -> c) -> WhenMatched f k x y a -> WhenMatched f k x y b -> WhenMatched f k x y c

(*>) :: WhenMatched f k x y a -> WhenMatched f k x y b -> WhenMatched f k x y b

(<*) :: WhenMatched f k x y a -> WhenMatched f k x y b -> WhenMatched f k x y a

(<$>) :: Functor f => (a -> b) -> f a -> f b infixl 4

An infix synonym for fmap.

The name of this operator is an allusion to $. Note the similarities between their types:

 ($)  ::              (a -> b) ->   a ->   b
(<$>) :: Functor f => (a -> b) -> f a -> f b

Whereas $ is function application, <$> is function application lifted over a Functor.

Examples

Convert from a Maybe Int to a Maybe String using show:

>>> show <$> Nothing
Nothing
>>> show <$> Just 3
Just "3"

Convert from an Either Int Int to an Either Int String using show:

>>> show <$> Left 17
Left 17
>>> show <$> Right 17
Right "17"

Double each element of a list:

>>> (*2) <$> [1,2,3]
[2,4,6]

Apply even to the second element of a pair:

>>> even <$> (2,2)
(2,True)

duplicateLocalDs :: Id -> DsM Id

newSysLocalDsNoLP :: Type -> DsM Id

newSysLocalDs :: Type -> DsM Id

newSysLocalsDsNoLP :: [Type] -> DsM [Id]

newSysLocalsDs :: [Type] -> DsM [Id]

newUniqueId :: Id -> Type -> DsM Id

newFailLocalDs :: Type -> DsM Id

newPredVarDs :: PredType -> DsM Var

getSrcSpanDs :: DsM SrcSpan

putSrcSpanDs :: SrcSpan -> DsM a -> DsM a

mkPrintUnqualifiedDs :: DsM PrintUnqualified

newUnique :: TcRnIf gbl lcl Unique

data UniqSupply

Unique Supply

A value of type UniqSupply is unique, and it can supply one distinct Unique. Also, from the supply, one can also manufacture an arbitrary number of further UniqueSupply values, which will be distinct from the first and from all others.

newUniqueSupply :: TcRnIf gbl lcl UniqSupply

getGhcModeDs :: DsM GhcMode

dsGetFamInstEnvs :: DsM FamInstEnvs

dsLookupGlobal :: Name -> DsM TyThing

dsLookupGlobalId :: Name -> DsM Id

dsDPHBuiltin :: (PArrBuiltin -> a) -> DsM a

Get a name from Data.Array.Parallel for the desugarer, from the ds_parr_bi component of the global desugerar environment.

dsLookupTyCon :: Name -> DsM TyCon

dsLookupDataCon :: Name -> DsM DataCon

dsLookupConLike :: Name -> DsM ConLike

data PArrBuiltin

Constructors

PArrBuiltin

Fields

• lengthPVar :: Var

  lengthP

• replicatePVar :: Var

  replicateP

• singletonPVar :: Var

  singletonP

• mapPVar :: Var

  mapP

• filterPVar :: Var

  filterP

• zipPVar :: Var

  zipP

• crossMapPVar :: Var

  crossMapP

• indexPVar :: Var

  (!:)

• emptyPVar :: Var

  emptyP

• appPVar :: Var

  (+:+)

• enumFromToPVar :: Var

  enumFromToP

• enumFromThenToPVar :: Var

  enumFromThenToP

dsLookupDPHRdrEnv :: OccName -> DsM Name

Lookup a name exported by Prim or Prim. Panic if there isn't one, or if it is defined multiple times.

dsLookupDPHRdrEnv_maybe :: OccName -> DsM (Maybe Name)

Lookup a name exported by Prim or Prim, returning Nothing if it's not defined. Panic if it's defined multiple times.

dsInitPArrBuiltin :: DsM a -> DsM a

Populate ds_parr_bi from ds_dph_env.

type DsMetaEnv = NameEnv DsMetaVal

data DsMetaVal

Constructors

DsBound Id

DsSplice (HsExpr Id)

dsGetMetaEnv :: DsM (NameEnv DsMetaVal)

dsLookupMetaEnv :: Name -> DsM (Maybe DsMetaVal)

dsExtendMetaEnv :: DsMetaEnv -> DsM a -> DsM a

getDictsDs :: DsM (Bag EvVar)

Get in-scope type constraints (pm check)

addDictsDs :: Bag EvVar -> DsM a -> DsM a

Add in-scope type constraints (pm check)

getTmCsDs :: DsM (Bag SimpleEq)

Get in-scope term constraints (pm check)

addTmCsDs :: Bag SimpleEq -> DsM a -> DsM a

Add in-scope term constraints (pm check)

incrCheckPmIterDs :: DsM Int

Increase the counter for elapsed pattern match check iterations. If the current counter is already over the limit, fail

resetPmIterDs :: DsM ()

Reset the counter for pattern match check iterations to zero

dsGetCompleteMatches :: TyCon -> DsM [CompleteMatch]

The COMPLETE pragams provided by the user for a given TyCon.

type DsWarning = (SrcSpan, SDoc)

warnDs :: WarnReason -> SDoc -> DsM ()

Emit a warning for the current source location NB: Warns whether or not -Wxyz is set

warnIfSetDs :: WarningFlag -> SDoc -> DsM ()

Emit a warning only if the correct WarnReason is set in the DynFlags

errDs :: SDoc -> DsM ()

errDsCoreExpr :: SDoc -> DsM CoreExpr

Issue an error, but return the expression for (), so that we can continue reporting errors.

failWithDs :: SDoc -> DsM a

failDs :: DsM a

discardWarningsDs :: DsM a -> DsM a

askNoErrsDs :: DsM a -> DsM (a, Bool)

data DsMatchContext

Constructors

DsMatchContext (HsMatchContext Name) SrcSpan

Instances

Outputable DsMatchContext

Methods

ppr :: DsMatchContext -> SDoc

pprPrec :: Rational -> DsMatchContext -> SDoc

data EquationInfo

Constructors

EqnInfo

Fields

• eqn_pats :: [Pat Id]
• eqn_rhs :: MatchResult

Instances

Outputable EquationInfo

Methods

ppr :: EquationInfo -> SDoc

pprPrec :: Rational -> EquationInfo -> SDoc

data MatchResult

Constructors

MatchResult CanItFail (CoreExpr -> DsM CoreExpr)

type DsWrapper = CoreExpr -> CoreExpr

idDsWrapper :: DsWrapper

data CanItFail

Constructors

CanFail

CantFail

orFail :: CanItFail -> CanItFail -> CanItFail

dsNoLevPoly :: Type -> SDoc -> DsM ()

Fail with an error message if the type is levity polymorphic.

dsNoLevPolyExpr :: CoreExpr -> SDoc -> DsM ()

Check an expression for levity polymorphism, failing if it is levity polymorphic.

dsWhenNoErrs :: DsM a -> (a -> CoreExpr) -> DsM CoreExpr

Runs the thing_inside. If there are no errors, then returns the expr given. Otherwise, returns unitExpr. This is useful for doing a bunch of levity polymorphism checks and then avoiding making a core App. (If we make a core App on a levity polymorphic argument, detecting how to handle the let/app invariant might call isUnliftedType, which panics on a levity polymorphic type.) See #12709 for an example of why this machinery is necessary.

Orphan instances

MonadThings (IOEnv (Env DsGblEnv DsLclEnv))

Methods

lookupThing :: Name -> IOEnv (Env DsGblEnv DsLclEnv) TyThing

lookupId :: Name -> IOEnv (Env DsGblEnv DsLclEnv) Id

lookupDataCon :: Name -> IOEnv (Env DsGblEnv DsLclEnv) DataCon

lookupTyCon :: Name -> IOEnv (Env DsGblEnv DsLclEnv) TyCon