Safe Haskell	None
Language	Haskell2010

DsMonad

Contents

Orphan instances

Synopsis

type DsM = TcRnIf DsGblEnv DsLclEnv
mapM :: (Traversable t, Monad m) => (a -> m b) -> t a -> m (t b)
mapAndUnzipM :: Applicative m => (a -> m (b, c)) -> [a] -> m ([b], [c])
initDs :: HscEnv -> TcGblEnv -> DsM a -> IO (Messages, Maybe a)
initDsTc :: DsM a -> TcM a
initTcDsForSolver :: TcM a -> DsM (Messages, Maybe a)
initDsWithModGuts :: HscEnv -> ModGuts -> DsM a -> IO (Messages, Maybe a)
fixDs :: (a -> DsM a) -> DsM a
foldlM :: Monad m => (a -> b -> m a) -> a -> [b] -> m a
foldrM :: Monad m => (b -> a -> m a) -> a -> [b] -> m a
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
(<$>) :: Functor f => (a -> b) -> f a -> f b
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
newUniqueSupply :: TcRnIf gbl lcl UniqSupply
getGhcModeDs :: DsM GhcMode
dsGetFamInstEnvs :: DsM FamInstEnvs
dsLookupGlobal :: Name -> DsM TyThing
dsLookupGlobalId :: Name -> DsM Id
dsDPHBuiltin :: (PArrBuiltin -> a) -> DsM a
dsLookupTyCon :: Name -> DsM TyCon
dsLookupDataCon :: Name -> DsM DataCon
dsLookupConLike :: Name -> DsM ConLike
data PArrBuiltin = PArrBuiltin {
- lengthPVar :: Var
- replicatePVar :: Var
- singletonPVar :: Var
- mapPVar :: Var
- filterPVar :: Var
- zipPVar :: Var
- crossMapPVar :: Var
- indexPVar :: Var
- emptyPVar :: Var
- appPVar :: Var
- enumFromToPVar :: Var
- enumFromThenToPVar :: Var
}
dsLookupDPHRdrEnv :: OccName -> DsM Name
dsLookupDPHRdrEnv_maybe :: OccName -> DsM (Maybe Name)
dsInitPArrBuiltin :: DsM a -> DsM a
type DsMetaEnv = NameEnv DsMetaVal
data DsMetaVal
- = DsBound Id
- | DsSplice (HsExpr GhcTc)
dsGetMetaEnv :: DsM (NameEnv DsMetaVal)
dsLookupMetaEnv :: Name -> DsM (Maybe DsMetaVal)
dsExtendMetaEnv :: DsMetaEnv -> DsM a -> DsM a
getDictsDs :: DsM (Bag EvVar)
addDictsDs :: Bag EvVar -> DsM a -> DsM a
getTmCsDs :: DsM (Bag SimpleEq)
addTmCsDs :: Bag SimpleEq -> DsM a -> DsM a
incrCheckPmIterDs :: DsM Int
resetPmIterDs :: DsM ()
dsGetCompleteMatches :: TyCon -> DsM [CompleteMatch]
type DsWarning = (SrcSpan, SDoc)
warnDs :: WarnReason -> SDoc -> DsM ()
warnIfSetDs :: WarningFlag -> SDoc -> DsM ()
errDs :: SDoc -> DsM ()
errDsCoreExpr :: SDoc -> DsM CoreExpr
failWithDs :: SDoc -> DsM a
failDs :: DsM a
discardWarningsDs :: DsM a -> DsM a
askNoErrsDs :: DsM a -> DsM (a, Bool)
data DsMatchContext = DsMatchContext (HsMatchContext Name) SrcSpan
data EquationInfo = EqnInfo {
- eqn_pats :: [Pat GhcTc]
- eqn_rhs :: MatchResult
}
data MatchResult = MatchResult CanItFail (CoreExpr -> DsM CoreExpr)
type DsWrapper = CoreExpr -> CoreExpr
idDsWrapper :: DsWrapper
data CanItFail
- = CanFail
- | CantFail
orFail :: CanItFail -> CanItFail -> CanItFail
dsNoLevPoly :: Type -> SDoc -> DsM ()
dsNoLevPolyExpr :: CoreExpr -> SDoc -> DsM ()
dsWhenNoErrs :: DsM a -> (a -> CoreExpr) -> DsM CoreExpr
pprRuntimeTrace :: String -> SDoc -> CoreExpr -> DsM CoreExpr

Documentation

type DsM = TcRnIf DsGblEnv DsLclEnv Source #

mapM :: (Traversable t, Monad m) => (a -> m b) -> t a -> m (t b) Source #

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]) Source #

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) Source #

Run a DsM action inside the IO monad.

initDsTc :: DsM a -> TcM a Source #

Run a DsM action inside the TcM monad.

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

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

Run a DsM action in the context of an existing ModGuts

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

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

Monadic version of foldl

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

Monadic version of foldr

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

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

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

xoptM :: Extension -> TcRnIf gbl lcl Bool Source #

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

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 Source #

Lift a value.

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

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 Source #

Sequence actions, discarding the value of the first argument.

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

Sequence actions, discarding the value of the second argument.

Instances

Applicative []	Since: base-2.1
Instance details Defined in GHC.Base Methods pure :: a -> [a] Source # (<>) :: [a -> b] -> [a] -> [b] Source # liftA2 :: (a -> b -> c) -> [a] -> [b] -> [c] Source # (>) :: [a] -> [b] -> [b] Source # (<*) :: [a] -> [b] -> [a] Source #
Applicative Maybe	Since: base-2.1
Instance details Defined in GHC.Base Methods pure :: a -> Maybe a Source # (<>) :: Maybe (a -> b) -> Maybe a -> Maybe b Source # liftA2 :: (a -> b -> c) -> Maybe a -> Maybe b -> Maybe c Source # (>) :: Maybe a -> Maybe b -> Maybe b Source # (<*) :: Maybe a -> Maybe b -> Maybe a Source #
Applicative IO	Since: base-2.1
Instance details Defined in GHC.Base Methods pure :: a -> IO a Source # (<>) :: IO (a -> b) -> IO a -> IO b Source # liftA2 :: (a -> b -> c) -> IO a -> IO b -> IO c Source # (>) :: IO a -> IO b -> IO b Source # (<*) :: IO a -> IO b -> IO a Source #
Applicative Par1	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> Par1 a Source # (<>) :: Par1 (a -> b) -> Par1 a -> Par1 b Source # liftA2 :: (a -> b -> c) -> Par1 a -> Par1 b -> Par1 c Source # (>) :: Par1 a -> Par1 b -> Par1 b Source # (<*) :: Par1 a -> Par1 b -> Par1 a Source #
Applicative Q
Instance details Defined in Language.Haskell.TH.Syntax Methods pure :: a -> Q a Source # (<>) :: Q (a -> b) -> Q a -> Q b Source # liftA2 :: (a -> b -> c) -> Q a -> Q b -> Q c Source # (>) :: Q a -> Q b -> Q b Source # (<*) :: Q a -> Q b -> Q a Source #
Applicative Complex	Since: base-4.9.0.0
Instance details Defined in Data.Complex Methods pure :: a -> Complex a Source # (<>) :: Complex (a -> b) -> Complex a -> Complex b Source # liftA2 :: (a -> b -> c) -> Complex a -> Complex b -> Complex c Source # (>) :: Complex a -> Complex b -> Complex b Source # (<*) :: Complex a -> Complex b -> Complex a Source #
Applicative Min	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods pure :: a -> Min a Source # (<>) :: Min (a -> b) -> Min a -> Min b Source # liftA2 :: (a -> b -> c) -> Min a -> Min b -> Min c Source # (>) :: Min a -> Min b -> Min b Source # (<*) :: Min a -> Min b -> Min a Source #
Applicative Max	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods pure :: a -> Max a Source # (<>) :: Max (a -> b) -> Max a -> Max b Source # liftA2 :: (a -> b -> c) -> Max a -> Max b -> Max c Source # (>) :: Max a -> Max b -> Max b Source # (<*) :: Max a -> Max b -> Max a Source #
Applicative First	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods pure :: a -> First a Source # (<>) :: First (a -> b) -> First a -> First b Source # liftA2 :: (a -> b -> c) -> First a -> First b -> First c Source # (>) :: First a -> First b -> First b Source # (<*) :: First a -> First b -> First a Source #
Applicative Last	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods pure :: a -> Last a Source # (<>) :: Last (a -> b) -> Last a -> Last b Source # liftA2 :: (a -> b -> c) -> Last a -> Last b -> Last c Source # (>) :: Last a -> Last b -> Last b Source # (<*) :: Last a -> Last b -> Last a Source #
Applicative Option	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods pure :: a -> Option a Source # (<>) :: Option (a -> b) -> Option a -> Option b Source # liftA2 :: (a -> b -> c) -> Option a -> Option b -> Option c Source # (>) :: Option a -> Option b -> Option b Source # (<*) :: Option a -> Option b -> Option a Source #
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: base-2.1
Instance details Defined in Control.Applicative Methods pure :: a -> ZipList a Source # (<>) :: ZipList (a -> b) -> ZipList a -> ZipList b Source # liftA2 :: (a -> b -> c) -> ZipList a -> ZipList b -> ZipList c Source # (>) :: ZipList a -> ZipList b -> ZipList b Source # (<*) :: ZipList a -> ZipList b -> ZipList a Source #
Applicative Identity	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods pure :: a -> Identity a Source # (<>) :: Identity (a -> b) -> Identity a -> Identity b Source # liftA2 :: (a -> b -> c) -> Identity a -> Identity b -> Identity c Source # (>) :: Identity a -> Identity b -> Identity b Source # (<*) :: Identity a -> Identity b -> Identity a Source #
Applicative STM	Since: base-4.8.0.0
Instance details Defined in GHC.Conc.Sync Methods pure :: a -> STM a Source # (<>) :: STM (a -> b) -> STM a -> STM b Source # liftA2 :: (a -> b -> c) -> STM a -> STM b -> STM c Source # (>) :: STM a -> STM b -> STM b Source # (<*) :: STM a -> STM b -> STM a Source #
Applicative First
Instance details Defined in Data.Monoid Methods pure :: a -> First a Source # (<>) :: First (a -> b) -> First a -> First b Source # liftA2 :: (a -> b -> c) -> First a -> First b -> First c Source # (>) :: First a -> First b -> First b Source # (<*) :: First a -> First b -> First a Source #
Applicative Last
Instance details Defined in Data.Monoid Methods pure :: a -> Last a Source # (<>) :: Last (a -> b) -> Last a -> Last b Source # liftA2 :: (a -> b -> c) -> Last a -> Last b -> Last c Source # (>) :: Last a -> Last b -> Last b Source # (<*) :: Last a -> Last b -> Last a Source #
Applicative Dual	Since: base-4.8.0.0
Instance details Defined in Data.Semigroup.Internal Methods pure :: a -> Dual a Source # (<>) :: Dual (a -> b) -> Dual a -> Dual b Source # liftA2 :: (a -> b -> c) -> Dual a -> Dual b -> Dual c Source # (>) :: Dual a -> Dual b -> Dual b Source # (<*) :: Dual a -> Dual b -> Dual a Source #
Applicative Sum	Since: base-4.8.0.0
Instance details Defined in Data.Semigroup.Internal Methods pure :: a -> Sum a Source # (<>) :: Sum (a -> b) -> Sum a -> Sum b Source # liftA2 :: (a -> b -> c) -> Sum a -> Sum b -> Sum c Source # (>) :: Sum a -> Sum b -> Sum b Source # (<*) :: Sum a -> Sum b -> Sum a Source #
Applicative Product	Since: base-4.8.0.0
Instance details Defined in Data.Semigroup.Internal Methods pure :: a -> Product a Source # (<>) :: Product (a -> b) -> Product a -> Product b Source # liftA2 :: (a -> b -> c) -> Product a -> Product b -> Product c Source # (>) :: Product a -> Product b -> Product b Source # (<*) :: Product a -> Product b -> Product a Source #
Applicative Down	Since: base-4.11.0.0
Instance details Defined in Data.Ord Methods pure :: a -> Down a Source # (<>) :: Down (a -> b) -> Down a -> Down b Source # liftA2 :: (a -> b -> c) -> Down a -> Down b -> Down c Source # (>) :: Down a -> Down b -> Down b Source # (<*) :: Down a -> Down b -> Down a Source #
Applicative ReadPrec	Since: base-4.6.0.0
Instance details Defined in Text.ParserCombinators.ReadPrec Methods pure :: a -> ReadPrec a Source # (<>) :: ReadPrec (a -> b) -> ReadPrec a -> ReadPrec b Source # liftA2 :: (a -> b -> c) -> ReadPrec a -> ReadPrec b -> ReadPrec c Source # (>) :: ReadPrec a -> ReadPrec b -> ReadPrec b Source # (<*) :: ReadPrec a -> ReadPrec b -> ReadPrec a Source #
Applicative ReadP	Since: base-4.6.0.0
Instance details Defined in Text.ParserCombinators.ReadP Methods pure :: a -> ReadP a Source # (<>) :: ReadP (a -> b) -> ReadP a -> ReadP b Source # liftA2 :: (a -> b -> c) -> ReadP a -> ReadP b -> ReadP c Source # (>) :: ReadP a -> ReadP b -> ReadP b Source # (<*) :: ReadP a -> ReadP b -> ReadP a Source #
Applicative NonEmpty	Since: base-4.9.0.0
Instance details Defined in GHC.Base Methods pure :: a -> NonEmpty a Source # (<>) :: NonEmpty (a -> b) -> NonEmpty a -> NonEmpty b Source # liftA2 :: (a -> b -> c) -> NonEmpty a -> NonEmpty b -> NonEmpty c Source # (>) :: NonEmpty a -> NonEmpty b -> NonEmpty b Source # (<*) :: NonEmpty a -> NonEmpty b -> NonEmpty a Source #
Applicative Put
Instance details Defined in Data.ByteString.Builder.Internal Methods pure :: a -> Put a Source # (<>) :: Put (a -> b) -> Put a -> Put b Source # liftA2 :: (a -> b -> c) -> Put a -> Put b -> Put c Source # (>) :: Put a -> Put b -> Put b Source # (<*) :: Put a -> Put b -> Put a Source #
Applicative PutM
Instance details Defined in Data.Binary.Put Methods pure :: a -> PutM a Source # (<>) :: PutM (a -> b) -> PutM a -> PutM b Source # liftA2 :: (a -> b -> c) -> PutM a -> PutM b -> PutM c Source # (>) :: PutM a -> PutM b -> PutM b Source # (<*) :: PutM a -> PutM b -> PutM a Source #
Applicative Get
Instance details Defined in Data.Binary.Get.Internal Methods pure :: a -> Get a Source # (<>) :: Get (a -> b) -> Get a -> Get b Source # liftA2 :: (a -> b -> c) -> Get a -> Get b -> Get c Source # (>) :: Get a -> Get b -> Get b Source # (<*) :: Get a -> Get b -> Get a Source #
Applicative Tree
Instance details Defined in Data.Tree Methods pure :: a -> Tree a Source # (<>) :: Tree (a -> b) -> Tree a -> Tree b Source # liftA2 :: (a -> b -> c) -> Tree a -> Tree b -> Tree c Source # (>) :: Tree a -> Tree b -> Tree b Source # (<*) :: Tree a -> Tree b -> Tree a Source #
Applicative Seq	Since: containers-0.5.4
Instance details Defined in Data.Sequence.Internal Methods pure :: a -> Seq a Source # (<>) :: Seq (a -> b) -> Seq a -> Seq b Source # liftA2 :: (a -> b -> c) -> Seq a -> Seq b -> Seq c Source # (>) :: Seq a -> Seq b -> Seq b Source # (<*) :: Seq a -> Seq b -> Seq a Source #
Applicative Capability
Instance details Defined in System.Console.Terminfo.Base Methods pure :: a -> Capability a Source # (<>) :: Capability (a -> b) -> Capability a -> Capability b Source # liftA2 :: (a -> b -> c) -> Capability a -> Capability b -> Capability c Source # (>) :: Capability a -> Capability b -> Capability b Source # (<*) :: Capability a -> Capability b -> Capability a Source #
Applicative P	Since: base-4.5.0.0
Instance details Defined in Text.ParserCombinators.ReadP Methods pure :: a -> P a Source # (<>) :: P (a -> b) -> P a -> P b Source # liftA2 :: (a -> b -> c) -> P a -> P b -> P c Source # (>) :: P a -> P b -> P b Source # (<*) :: P a -> P b -> P a Source #
Applicative Pair #
Instance details Defined in Pair Methods pure :: a -> Pair a Source # (<>) :: Pair (a -> b) -> Pair a -> Pair b Source # liftA2 :: (a -> b -> c) -> Pair a -> Pair b -> Pair c Source # (>) :: Pair a -> Pair b -> Pair b Source # (<*) :: Pair a -> Pair b -> Pair a Source #
Applicative UniqSM #
Instance details Defined in UniqSupply Methods pure :: a -> UniqSM a Source # (<>) :: UniqSM (a -> b) -> UniqSM a -> UniqSM b Source # liftA2 :: (a -> b -> c) -> UniqSM a -> UniqSM b -> UniqSM c Source # (>) :: UniqSM a -> UniqSM b -> UniqSM b Source # (<*) :: UniqSM a -> UniqSM b -> UniqSM a Source #
Applicative P #
Instance details Defined in Lexer Methods pure :: a -> P a Source # (<>) :: P (a -> b) -> P a -> P b Source # liftA2 :: (a -> b -> c) -> P a -> P b -> P c Source # (>) :: P a -> P b -> P b Source # (<*) :: P a -> P b -> P a Source #
Applicative PD #
Instance details Defined in CmmMonad Methods pure :: a -> PD a Source # (<>) :: PD (a -> b) -> PD a -> PD b Source # liftA2 :: (a -> b -> c) -> PD a -> PD b -> PD c Source # (>) :: PD a -> PD b -> PD b Source # (<*) :: PD a -> PD b -> PD a Source #
Applicative UnifyResultM #
Instance details Defined in Unify Methods pure :: a -> UnifyResultM a Source # (<>) :: UnifyResultM (a -> b) -> UnifyResultM a -> UnifyResultM b Source # liftA2 :: (a -> b -> c) -> UnifyResultM a -> UnifyResultM b -> UnifyResultM c Source # (>) :: UnifyResultM a -> UnifyResultM b -> UnifyResultM b Source # (<*) :: UnifyResultM a -> UnifyResultM b -> UnifyResultM a Source #
Applicative LlvmM #
Instance details Defined in LlvmCodeGen.Base Methods pure :: a -> LlvmM a Source # (<>) :: LlvmM (a -> b) -> LlvmM a -> LlvmM b Source # liftA2 :: (a -> b -> c) -> LlvmM a -> LlvmM b -> LlvmM c Source # (>) :: LlvmM a -> LlvmM b -> LlvmM b Source # (<*) :: LlvmM a -> LlvmM b -> LlvmM a Source #
Applicative FCode #
Instance details Defined in StgCmmMonad Methods pure :: a -> FCode a Source # (<>) :: FCode (a -> b) -> FCode a -> FCode b Source # liftA2 :: (a -> b -> c) -> FCode a -> FCode b -> FCode c Source # (>) :: FCode a -> FCode b -> FCode b Source # (<*) :: FCode a -> FCode b -> FCode a Source #
Applicative CmmParse #
Instance details Defined in StgCmmExtCode Methods pure :: a -> CmmParse a Source # (<>) :: CmmParse (a -> b) -> CmmParse a -> CmmParse b Source # liftA2 :: (a -> b -> c) -> CmmParse a -> CmmParse b -> CmmParse c Source # (>) :: CmmParse a -> CmmParse b -> CmmParse b Source # (<*) :: CmmParse a -> CmmParse b -> CmmParse a Source #
Applicative Hsc #
Instance details Defined in HscTypes Methods pure :: a -> Hsc a Source # (<>) :: Hsc (a -> b) -> Hsc a -> Hsc b Source # liftA2 :: (a -> b -> c) -> Hsc a -> Hsc b -> Hsc c Source # (>) :: Hsc a -> Hsc b -> Hsc b Source # (<*) :: Hsc a -> Hsc b -> Hsc a Source #
Applicative TcPluginM #
Instance details Defined in TcRnTypes Methods pure :: a -> TcPluginM a Source # (<>) :: TcPluginM (a -> b) -> TcPluginM a -> TcPluginM b Source # liftA2 :: (a -> b -> c) -> TcPluginM a -> TcPluginM b -> TcPluginM c Source # (>) :: TcPluginM a -> TcPluginM b -> TcPluginM b Source # (<*) :: TcPluginM a -> TcPluginM b -> TcPluginM a Source #
Applicative CompPipeline #
Instance details Defined in PipelineMonad Methods pure :: a -> CompPipeline a Source # (<>) :: CompPipeline (a -> b) -> CompPipeline a -> CompPipeline b Source # liftA2 :: (a -> b -> c) -> CompPipeline a -> CompPipeline b -> CompPipeline c Source # (>) :: CompPipeline a -> CompPipeline b -> CompPipeline b Source # (<*) :: CompPipeline a -> CompPipeline b -> CompPipeline a Source #
Applicative Ghc #
Instance details Defined in GhcMonad Methods pure :: a -> Ghc a Source # (<>) :: Ghc (a -> b) -> Ghc a -> Ghc b Source # liftA2 :: (a -> b -> c) -> Ghc a -> Ghc b -> Ghc c Source # (>) :: Ghc a -> Ghc b -> Ghc b Source # (<*) :: Ghc a -> Ghc b -> Ghc a Source #
Applicative CoreM #
Instance details Defined in CoreMonad Methods pure :: a -> CoreM a Source # (<>) :: CoreM (a -> b) -> CoreM a -> CoreM b Source # liftA2 :: (a -> b -> c) -> CoreM a -> CoreM b -> CoreM c Source # (>) :: CoreM a -> CoreM b -> CoreM b Source # (<*) :: CoreM a -> CoreM b -> CoreM a Source #
Applicative SimplM #
Instance details Defined in SimplMonad Methods pure :: a -> SimplM a Source # (<>) :: SimplM (a -> b) -> SimplM a -> SimplM b Source # liftA2 :: (a -> b -> c) -> SimplM a -> SimplM b -> SimplM c Source # (>) :: SimplM a -> SimplM b -> SimplM b Source # (<*) :: SimplM a -> SimplM b -> SimplM a Source #
Applicative CpsRn #
Instance details Defined in RnPat Methods pure :: a -> CpsRn a Source # (<>) :: CpsRn (a -> b) -> CpsRn a -> CpsRn b Source # liftA2 :: (a -> b -> c) -> CpsRn a -> CpsRn b -> CpsRn c Source # (>) :: CpsRn a -> CpsRn b -> CpsRn b Source # (<*) :: CpsRn a -> CpsRn b -> CpsRn a Source #
Applicative OccCheckResult #
Instance details Defined in TcUnify Methods pure :: a -> OccCheckResult a Source # (<>) :: OccCheckResult (a -> b) -> OccCheckResult a -> OccCheckResult b Source # liftA2 :: (a -> b -> c) -> OccCheckResult a -> OccCheckResult b -> OccCheckResult c Source # (>) :: OccCheckResult a -> OccCheckResult b -> OccCheckResult b Source # (<*) :: OccCheckResult a -> OccCheckResult b -> OccCheckResult a Source #
Applicative TcS #
Instance details Defined in TcSMonad Methods pure :: a -> TcS a Source # (<>) :: TcS (a -> b) -> TcS a -> TcS b Source # liftA2 :: (a -> b -> c) -> TcS a -> TcS b -> TcS c Source # (>) :: TcS a -> TcS b -> TcS b Source # (<*) :: TcS a -> TcS b -> TcS a Source #
Applicative VM #
Instance details Defined in Vectorise.Monad.Base Methods pure :: a -> VM a Source # (<>) :: VM (a -> b) -> VM a -> VM b Source # liftA2 :: (a -> b -> c) -> VM a -> VM b -> VM c Source # (>) :: VM a -> VM b -> VM b Source # (<*) :: VM a -> VM b -> VM a Source #
Applicative NatM #
Instance details Defined in NCGMonad Methods pure :: a -> NatM a Source # (<>) :: NatM (a -> b) -> NatM a -> NatM b Source # liftA2 :: (a -> b -> c) -> NatM a -> NatM b -> NatM c Source # (>) :: NatM a -> NatM b -> NatM b Source # (<*) :: NatM a -> NatM b -> NatM a Source #
Applicative (Either e)	Since: base-3.0
Instance details Defined in Data.Either Methods pure :: a -> Either e a Source # (<>) :: Either e (a -> b) -> Either e a -> Either e b Source # liftA2 :: (a -> b -> c) -> Either e a -> Either e b -> Either e c Source # (>) :: Either e a -> Either e b -> Either e b Source # (<*) :: Either e a -> Either e b -> Either e a Source #
Applicative (U1 :: * -> *)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> U1 a Source # (<>) :: U1 (a -> b) -> U1 a -> U1 b Source # liftA2 :: (a -> b -> c) -> U1 a -> U1 b -> U1 c Source # (>) :: U1 a -> U1 b -> U1 b Source # (<*) :: U1 a -> U1 b -> U1 a Source #
Monoid a => Applicative ((,) a)	For tuples, the `Monoid` constraint on `a` determines how the first values merge. For example, `String`s concatenate: ("hello ", (+15)) <> ("world!", 2002) ("hello world!",2017) Since: base-2.1*
Instance details Defined in GHC.Base Methods pure :: a0 -> (a, a0) Source # (<>) :: (a, a0 -> b) -> (a, a0) -> (a, b) Source # liftA2 :: (a0 -> b -> c) -> (a, a0) -> (a, b) -> (a, c) Source # (>) :: (a, a0) -> (a, b) -> (a, b) Source # (<*) :: (a, a0) -> (a, b) -> (a, a0) Source #
Monad m => Applicative (WrappedMonad m)	Since: base-2.1
Instance details Defined in Control.Applicative Methods pure :: a -> WrappedMonad m a Source # (<>) :: WrappedMonad m (a -> b) -> WrappedMonad m a -> WrappedMonad m b Source # liftA2 :: (a -> b -> c) -> WrappedMonad m a -> WrappedMonad m b -> WrappedMonad m c Source # (>) :: WrappedMonad m a -> WrappedMonad m b -> WrappedMonad m b Source # (<*) :: WrappedMonad m a -> WrappedMonad m b -> WrappedMonad m a Source #
Arrow a => Applicative (ArrowMonad a)	Since: base-4.6.0.0
Instance details Defined in Control.Arrow Methods pure :: a0 -> ArrowMonad a a0 Source # (<>) :: ArrowMonad a (a0 -> b) -> ArrowMonad a a0 -> ArrowMonad a b Source # liftA2 :: (a0 -> b -> c) -> ArrowMonad a a0 -> ArrowMonad a b -> ArrowMonad a c Source # (>) :: ArrowMonad a a0 -> ArrowMonad a b -> ArrowMonad a b Source # (<*) :: ArrowMonad a a0 -> ArrowMonad a b -> ArrowMonad a a0 Source #
Applicative (Proxy :: * -> *)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods pure :: a -> Proxy a Source # (<>) :: Proxy (a -> b) -> Proxy a -> Proxy b Source # liftA2 :: (a -> b -> c) -> Proxy a -> Proxy b -> Proxy c Source # (>) :: Proxy a -> Proxy b -> Proxy b Source # (<*) :: Proxy a -> Proxy b -> Proxy a Source #
Applicative (ST s)	Since: base-4.4.0.0
Instance details Defined in GHC.ST Methods pure :: a -> ST s a Source # (<>) :: ST s (a -> b) -> ST s a -> ST s b Source # liftA2 :: (a -> b -> c) -> ST s a -> ST s b -> ST s c Source # (>) :: ST s a -> ST s b -> ST s b Source # (<*) :: ST s a -> ST s b -> ST s a Source #
(Functor m, Monad m) => Applicative (MaybeT m)
Instance details Defined in Control.Monad.Trans.Maybe Methods pure :: a -> MaybeT m a Source # (<>) :: MaybeT m (a -> b) -> MaybeT m a -> MaybeT m b Source # liftA2 :: (a -> b -> c) -> MaybeT m a -> MaybeT m b -> MaybeT m c Source # (>) :: MaybeT m a -> MaybeT m b -> MaybeT m b Source # (<*) :: MaybeT m a -> MaybeT m b -> MaybeT m a Source #
Applicative (ListT f) #
Instance details Defined in ListT Methods pure :: a -> ListT f a Source # (<>) :: ListT f (a -> b) -> ListT f a -> ListT f b Source # liftA2 :: (a -> b -> c) -> ListT f a -> ListT f b -> ListT f c Source # (>) :: ListT f a -> ListT f b -> ListT f b Source # (<*) :: ListT f a -> ListT f b -> ListT f a Source #
Applicative (State s) #
Instance details Defined in State Methods pure :: a -> State s a Source # (<>) :: State s (a -> b) -> State s a -> State s b Source # liftA2 :: (a -> b -> c) -> State s a -> State s b -> State s c Source # (>) :: State s a -> State s b -> State s b Source # (<*) :: State s a -> State s b -> State s a Source #
Applicative (MaybeErr err) #
Instance details Defined in Maybes Methods pure :: a -> MaybeErr err a Source # (<>) :: MaybeErr err (a -> b) -> MaybeErr err a -> MaybeErr err b Source # liftA2 :: (a -> b -> c) -> MaybeErr err a -> MaybeErr err b -> MaybeErr err c Source # (>) :: MaybeErr err a -> MaybeErr err b -> MaybeErr err b Source # (<*) :: MaybeErr err a -> MaybeErr err b -> MaybeErr err a Source #
Applicative (SetM s)
Instance details Defined in Data.Graph Methods pure :: a -> SetM s a Source # (<>) :: SetM s (a -> b) -> SetM s a -> SetM s b Source # liftA2 :: (a -> b -> c) -> SetM s a -> SetM s b -> SetM s c Source # (>) :: SetM s a -> SetM s b -> SetM s b Source # (<*) :: SetM s a -> SetM s b -> SetM s a Source #
Applicative (CmdLineP s) #
Instance details Defined in CmdLineParser Methods pure :: a -> CmdLineP s a Source # (<>) :: CmdLineP s (a -> b) -> CmdLineP s a -> CmdLineP s b Source # liftA2 :: (a -> b -> c) -> CmdLineP s a -> CmdLineP s b -> CmdLineP s c Source # (>) :: CmdLineP s a -> CmdLineP s b -> CmdLineP s b Source # (<*) :: CmdLineP s a -> CmdLineP s b -> CmdLineP s a Source #
Monad m => Applicative (EwM m) #
Instance details Defined in CmdLineParser Methods pure :: a -> EwM m a Source # (<>) :: EwM m (a -> b) -> EwM m a -> EwM m b Source # liftA2 :: (a -> b -> c) -> EwM m a -> EwM m b -> EwM m c Source # (>) :: EwM m a -> EwM m b -> EwM m b Source # (<*) :: EwM m a -> EwM m b -> EwM m a Source #
Applicative (IOEnv m) #
Instance details Defined in IOEnv Methods pure :: a -> IOEnv m a Source # (<>) :: IOEnv m (a -> b) -> IOEnv m a -> IOEnv m b Source # liftA2 :: (a -> b -> c) -> IOEnv m a -> IOEnv m b -> IOEnv m c Source # (>) :: IOEnv m a -> IOEnv m b -> IOEnv m b Source # (<*) :: IOEnv m a -> IOEnv m b -> IOEnv m a Source #
Applicative (RegM freeRegs) #
Instance details Defined in RegAlloc.Linear.State Methods pure :: a -> RegM freeRegs a Source # (<>) :: RegM freeRegs (a -> b) -> RegM freeRegs a -> RegM freeRegs b Source # liftA2 :: (a -> b -> c) -> RegM freeRegs a -> RegM freeRegs b -> RegM freeRegs c Source # (>) :: RegM freeRegs a -> RegM freeRegs b -> RegM freeRegs b Source # (<*) :: RegM freeRegs a -> RegM freeRegs b -> RegM freeRegs a Source #
Applicative m => Applicative (GhcT m) #
Instance details Defined in GhcMonad Methods pure :: a -> GhcT m a Source # (<>) :: GhcT m (a -> b) -> GhcT m a -> GhcT m b Source # liftA2 :: (a -> b -> c) -> GhcT m a -> GhcT m b -> GhcT m c Source # (>) :: GhcT m a -> GhcT m b -> GhcT m b Source # (<*) :: GhcT m a -> GhcT m b -> GhcT m a Source #
Applicative f => Applicative (Rec1 f)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> Rec1 f a Source # (<>) :: Rec1 f (a -> b) -> Rec1 f a -> Rec1 f b Source # liftA2 :: (a -> b -> c) -> Rec1 f a -> Rec1 f b -> Rec1 f c Source # (>) :: Rec1 f a -> Rec1 f b -> Rec1 f b Source # (<*) :: Rec1 f a -> Rec1 f b -> Rec1 f a Source #
Arrow a => Applicative (WrappedArrow a b)	Since: base-2.1
Instance details Defined in Control.Applicative Methods pure :: a0 -> WrappedArrow a b a0 Source # (<>) :: WrappedArrow a b (a0 -> b0) -> WrappedArrow a b a0 -> WrappedArrow a b b0 Source # liftA2 :: (a0 -> b0 -> c) -> WrappedArrow a b a0 -> WrappedArrow a b b0 -> WrappedArrow a b c Source # (>) :: WrappedArrow a b a0 -> WrappedArrow a b b0 -> WrappedArrow a b b0 Source # (<*) :: WrappedArrow a b a0 -> WrappedArrow a b b0 -> WrappedArrow a b a0 Source #
Monoid m => Applicative (Const m :: * -> *)	Since: base-2.0.1
Instance details Defined in Data.Functor.Const Methods pure :: a -> Const m a Source # (<>) :: Const m (a -> b) -> Const m a -> Const m b Source # liftA2 :: (a -> b -> c) -> Const m a -> Const m b -> Const m c Source # (>) :: Const m a -> Const m b -> Const m b Source # (<*) :: Const m a -> Const m b -> Const m a Source #
Applicative f => Applicative (Alt f)
Instance details Defined in Data.Semigroup.Internal Methods pure :: a -> Alt f a Source # (<>) :: Alt f (a -> b) -> Alt f a -> Alt f b Source # liftA2 :: (a -> b -> c) -> Alt f a -> Alt f b -> Alt f c Source # (>) :: Alt f a -> Alt f b -> Alt f b Source # (<*) :: Alt f a -> Alt f b -> Alt f a Source #
(Applicative f, Monad f) => Applicative (WhenMissing f x)	Equivalent to `ReaderT k (ReaderT x (MaybeT f))`. Since: containers-0.5.9
Instance details Defined in Data.IntMap.Internal Methods pure :: a -> WhenMissing f x a Source # (<>) :: WhenMissing f x (a -> b) -> WhenMissing f x a -> WhenMissing f x b Source # liftA2 :: (a -> b -> c) -> WhenMissing f x a -> WhenMissing f x b -> WhenMissing f x c Source # (>) :: WhenMissing f x a -> WhenMissing f x b -> WhenMissing f x b Source # (<*) :: WhenMissing f x a -> WhenMissing f x b -> WhenMissing f x a Source #
(Monoid w, Applicative m) => Applicative (WriterT w m)
Instance details Defined in Control.Monad.Trans.Writer.Lazy Methods pure :: a -> WriterT w m a Source # (<>) :: WriterT w m (a -> b) -> WriterT w m a -> WriterT w m b Source # liftA2 :: (a -> b -> c) -> WriterT w m a -> WriterT w m b -> WriterT w m c Source # (>) :: WriterT w m a -> WriterT w m b -> WriterT w m b Source # (<*) :: WriterT w m a -> WriterT w m b -> WriterT w m a Source #
(Functor m, Monad m) => Applicative (StateT s m)
Instance details Defined in Control.Monad.Trans.State.Strict Methods pure :: a -> StateT s m a Source # (<>) :: StateT s m (a -> b) -> StateT s m a -> StateT s m b Source # liftA2 :: (a -> b -> c) -> StateT s m a -> StateT s m b -> StateT s m c Source # (>) :: StateT s m a -> StateT s m b -> StateT s m b Source # (<*) :: StateT s m a -> StateT s m b -> StateT s m a Source #
(Functor m, Monad m) => Applicative (StateT s m)
Instance details Defined in Control.Monad.Trans.State.Lazy Methods pure :: a -> StateT s m a Source # (<>) :: StateT s m (a -> b) -> StateT s m a -> StateT s m b Source # liftA2 :: (a -> b -> c) -> StateT s m a -> StateT s m b -> StateT s m c Source # (>) :: StateT s m a -> StateT s m b -> StateT s m b Source # (<*) :: StateT s m a -> StateT s m b -> StateT s m a Source #
(Functor m, Monad m) => Applicative (ExceptT e m)
Instance details Defined in Control.Monad.Trans.Except Methods pure :: a -> ExceptT e m a Source # (<>) :: ExceptT e m (a -> b) -> ExceptT e m a -> ExceptT e m b Source # liftA2 :: (a -> b -> c) -> ExceptT e m a -> ExceptT e m b -> ExceptT e m c Source # (>) :: ExceptT e m a -> ExceptT e m b -> ExceptT e m b Source # (<*) :: ExceptT e m a -> ExceptT e m b -> ExceptT e m a Source #
Monad m => Applicative (Stream m a) #
Instance details Defined in Stream Methods pure :: a0 -> Stream m a a0 Source # (<>) :: Stream m a (a0 -> b) -> Stream m a a0 -> Stream m a b Source # liftA2 :: (a0 -> b -> c) -> Stream m a a0 -> Stream m a b -> Stream m a c Source # (>) :: Stream m a a0 -> Stream m a b -> Stream m a b Source # (<*) :: Stream m a a0 -> Stream m a b -> Stream m a a0 Source #
Applicative ((->) a :: * -> *)	Since: base-2.1
Instance details Defined in GHC.Base Methods pure :: a0 -> a -> a0 Source # (<>) :: (a -> a0 -> b) -> (a -> a0) -> a -> b Source # liftA2 :: (a0 -> b -> c) -> (a -> a0) -> (a -> b) -> a -> c Source # (>) :: (a -> a0) -> (a -> b) -> a -> b Source # (<*) :: (a -> a0) -> (a -> b) -> a -> a0 Source #
(Applicative f, Applicative g) => Applicative (f :*: g)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> (f :: g) a Source # (<>) :: (f :: g) (a -> b) -> (f :: g) a -> (f :: g) b Source # liftA2 :: (a -> b -> c) -> (f :: g) a -> (f :: g) b -> (f :: g) c Source # (>) :: (f :: g) a -> (f :: g) b -> (f :: g) b Source # (<) :: (f :: g) a -> (f :: g) b -> (f :: g) a Source #
(Applicative f, Applicative g) => Applicative (Product f g)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Product Methods pure :: a -> Product f g a Source # (<>) :: Product f g (a -> b) -> Product f g a -> Product f g b Source # liftA2 :: (a -> b -> c) -> Product f g a -> Product f g b -> Product f g c Source # (>) :: Product f g a -> Product f g b -> Product f g b Source # (<*) :: Product f g a -> Product f g b -> Product f g a Source #
(Monad f, Applicative f) => Applicative (WhenMatched f x y)	Equivalent to `ReaderT Key (ReaderT x (ReaderT y (MaybeT f)))` Since: containers-0.5.9
Instance details Defined in Data.IntMap.Internal Methods pure :: a -> WhenMatched f x y a Source # (<>) :: WhenMatched f x y (a -> b) -> WhenMatched f x y a -> WhenMatched f x y b Source # liftA2 :: (a -> b -> c) -> WhenMatched f x y a -> WhenMatched f x y b -> WhenMatched f x y c Source # (>) :: WhenMatched f x y a -> WhenMatched f x y b -> WhenMatched f x y b Source # (<*) :: WhenMatched f x y a -> WhenMatched f x y b -> WhenMatched f x y a Source #
(Applicative f, Monad f) => Applicative (WhenMissing f k x)	Equivalent to `ReaderT k (ReaderT x (MaybeT f))` . Since: containers-0.5.9
Instance details Defined in Data.Map.Internal Methods pure :: a -> WhenMissing f k x a Source # (<>) :: WhenMissing f k x (a -> b) -> WhenMissing f k x a -> WhenMissing f k x b Source # liftA2 :: (a -> b -> c) -> WhenMissing f k x a -> WhenMissing f k x b -> WhenMissing f k x c Source # (>) :: WhenMissing f k x a -> WhenMissing f k x b -> WhenMissing f k x b Source # (<*) :: WhenMissing f k x a -> WhenMissing f k x b -> WhenMissing f k x a Source #
Applicative m => Applicative (ReaderT r m)
Instance details Defined in Control.Monad.Trans.Reader Methods pure :: a -> ReaderT r m a Source # (<>) :: ReaderT r m (a -> b) -> ReaderT r m a -> ReaderT r m b Source # liftA2 :: (a -> b -> c) -> ReaderT r m a -> ReaderT r m b -> ReaderT r m c Source # (>) :: ReaderT r m a -> ReaderT r m b -> ReaderT r m b Source # (<*) :: ReaderT r m a -> ReaderT r m b -> ReaderT r m a Source #
Applicative f => Applicative (M1 i c f)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> M1 i c f a Source # (<>) :: M1 i c f (a -> b) -> M1 i c f a -> M1 i c f b Source # liftA2 :: (a -> b -> c0) -> M1 i c f a -> M1 i c f b -> M1 i c f c0 Source # (>) :: M1 i c f a -> M1 i c f b -> M1 i c f b Source # (<*) :: M1 i c f a -> M1 i c f b -> M1 i c f a Source #
(Applicative f, Applicative g) => Applicative (f :.: g)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> (f :.: g) a Source # (<>) :: (f :.: g) (a -> b) -> (f :.: g) a -> (f :.: g) b Source # liftA2 :: (a -> b -> c) -> (f :.: g) a -> (f :.: g) b -> (f :.: g) c Source # (>) :: (f :.: g) a -> (f :.: g) b -> (f :.: g) b Source # (<*) :: (f :.: g) a -> (f :.: g) b -> (f :.: g) a Source #
(Applicative f, Applicative g) => Applicative (Compose f g)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Compose Methods pure :: a -> Compose f g a Source # (<>) :: Compose f g (a -> b) -> Compose f g a -> Compose f g b Source # liftA2 :: (a -> b -> c) -> Compose f g a -> Compose f g b -> Compose f g c Source # (>) :: Compose f g a -> Compose f g b -> Compose f g b Source # (<*) :: Compose f g a -> Compose f g b -> Compose f g a Source #
(Monad f, Applicative f) => Applicative (WhenMatched f k x y)	Equivalent to `ReaderT k (ReaderT x (ReaderT y (MaybeT f)))` Since: containers-0.5.9
Instance details Defined in Data.Map.Internal Methods pure :: a -> WhenMatched f k x y a Source # (<>) :: WhenMatched f k x y (a -> b) -> WhenMatched f k x y a -> WhenMatched f k x y b Source # liftA2 :: (a -> b -> c) -> WhenMatched f k x y a -> WhenMatched f k x y b -> WhenMatched f k x y c Source # (>) :: WhenMatched f k x y a -> WhenMatched f k x y b -> WhenMatched f k x y b Source # (<*) :: WhenMatched f k x y a -> WhenMatched f k x y b -> WhenMatched f k x y a Source #

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

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

Expand

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 Source #

newSysLocalDsNoLP :: Type -> DsM Id Source #

newSysLocalDs :: Type -> DsM Id Source #

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

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

newUniqueId :: Id -> Type -> DsM Id Source #

newFailLocalDs :: Type -> DsM Id Source #

newPredVarDs :: PredType -> DsM Var Source #

getSrcSpanDs :: DsM SrcSpan Source #

putSrcSpanDs :: SrcSpan -> DsM a -> DsM a Source #

mkPrintUnqualifiedDs :: DsM PrintUnqualified Source #

newUnique :: TcRnIf gbl lcl Unique Source #

data UniqSupply Source #

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 Source #

getGhcModeDs :: DsM GhcMode Source #

dsGetFamInstEnvs :: DsM FamInstEnvs Source #

dsLookupGlobal :: Name -> DsM TyThing Source #

dsLookupGlobalId :: Name -> DsM Id Source #

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

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 Source #

dsLookupDataCon :: Name -> DsM DataCon Source #

dsLookupConLike :: Name -> DsM ConLike Source #

data PArrBuiltin Source #

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 Source #

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) Source #

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 Source #

Populate ds_parr_bi from ds_dph_env.

type DsMetaEnv = NameEnv DsMetaVal Source #

data DsMetaVal Source #

Constructors

DsBound Id
DsSplice (HsExpr GhcTc)

dsGetMetaEnv :: DsM (NameEnv DsMetaVal) Source #

dsLookupMetaEnv :: Name -> DsM (Maybe DsMetaVal) Source #

dsExtendMetaEnv :: DsMetaEnv -> DsM a -> DsM a Source #

getDictsDs :: DsM (Bag EvVar) Source #

Get in-scope type constraints (pm check)

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

Add in-scope type constraints (pm check)

getTmCsDs :: DsM (Bag SimpleEq) Source #

Get in-scope term constraints (pm check)

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

Add in-scope term constraints (pm check)

incrCheckPmIterDs :: DsM Int Source #

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

resetPmIterDs :: DsM () Source #

Reset the counter for pattern match check iterations to zero

dsGetCompleteMatches :: TyCon -> DsM [CompleteMatch] Source #

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

type DsWarning = (SrcSpan, SDoc) Source #

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

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

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

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

errDs :: SDoc -> DsM () Source #

errDsCoreExpr :: SDoc -> DsM CoreExpr Source #

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

failWithDs :: SDoc -> DsM a Source #

failDs :: DsM a Source #

discardWarningsDs :: DsM a -> DsM a Source #

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

data DsMatchContext Source #

Constructors

DsMatchContext (HsMatchContext Name) SrcSpan

Instances

Outputable DsMatchContext Source #
Instance details Defined in DsMonad Methods ppr :: DsMatchContext -> SDoc Source # pprPrec :: Rational -> DsMatchContext -> SDoc Source #

data EquationInfo Source #

Constructors

EqnInfo
Fields eqn_pats :: [Pat GhcTc] eqn_rhs :: MatchResult

Instances

Outputable EquationInfo Source #
Instance details Defined in DsMonad Methods ppr :: EquationInfo -> SDoc Source # pprPrec :: Rational -> EquationInfo -> SDoc Source #

data MatchResult Source #

Constructors

MatchResult CanItFail (CoreExpr -> DsM CoreExpr)

type DsWrapper = CoreExpr -> CoreExpr Source #

idDsWrapper :: DsWrapper Source #

data CanItFail Source #

Constructors

CanFail
CantFail

orFail :: CanItFail -> CanItFail -> CanItFail Source #

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

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

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

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

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

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.

pprRuntimeTrace Source #

Arguments

:: String	header
-> SDoc	information to output
-> CoreExpr	expression
-> DsM CoreExpr

Inject a trace message into the compiled program. Whereas pprTrace prints out information *while compiling*, pprRuntimeTrace captures that information and causes it to be printed *at runtime* using Debug.Trace.trace.

pprRuntimeTrace hdr doc expr

will produce an expression that looks like

trace (hdr + doc) expr

When using this to debug a module that Debug.Trace depends on, it is necessary to import {--} Debug.Trace () in that module. We could avoid this inconvenience by wiring in Debug.Trace.trace, but that doesn't seem worth the effort and maintenance cost.

Orphan instances

MonadThings (IOEnv (Env DsGblEnv DsLclEnv)) Source #
Instance details Methods lookupThing :: Name -> IOEnv (Env DsGblEnv DsLclEnv) TyThing Source # lookupId :: Name -> IOEnv (Env DsGblEnv DsLclEnv) Id Source # lookupDataCon :: Name -> IOEnv (Env DsGblEnv DsLclEnv) DataCon Source # lookupTyCon :: Name -> IOEnv (Env DsGblEnv DsLclEnv) TyCon Source #