Safe Haskell | None |
---|---|
Language | Haskell2010 |
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 DsMessage, Maybe a)
- initDsTc :: DsM a -> TcM (Messages DsMessage, Maybe a)
- initTcDsForSolver :: TcM a -> DsM a
- initDsWithModGuts :: HscEnv -> ModGuts -> DsM a -> IO (Messages DsMessage, Maybe a)
- fixDs :: (a -> DsM a) -> DsM a
- foldlM :: (Foldable t, Monad m) => (b -> a -> m b) -> b -> t a -> m b
- foldrM :: (Foldable t, Monad m) => (a -> b -> m b) -> b -> t a -> m b
- 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 :: Type -> Type) where
- (<$>) :: Functor f => (a -> b) -> f a -> f b
- duplicateLocalDs :: Id -> DsM Id
- newSysLocalDs :: Mult -> Type -> DsM Id
- newSysLocalsDs :: [Scaled Type] -> DsM [Id]
- newUniqueId :: Id -> Mult -> Type -> DsM Id
- newFailLocalDs :: Mult -> Type -> DsM Id
- newPredVarDs :: PredType -> DsM Var
- getSrcSpanDs :: DsM SrcSpan
- putSrcSpanDs :: SrcSpan -> DsM a -> DsM a
- putSrcSpanDsA :: SrcSpanAnn' ann -> 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
- dsLookupTyCon :: Name -> DsM TyCon
- dsLookupDataCon :: Name -> DsM DataCon
- dsLookupConLike :: Name -> DsM ConLike
- getCCIndexDsM :: FastString -> DsM CostCentreIndex
- type DsMetaEnv = NameEnv DsMetaVal
- data DsMetaVal
- dsGetMetaEnv :: DsM (NameEnv DsMetaVal)
- dsLookupMetaEnv :: Name -> DsM (Maybe DsMetaVal)
- dsExtendMetaEnv :: DsMetaEnv -> DsM a -> DsM a
- getPmNablas :: DsM Nablas
- updPmNablas :: Nablas -> DsM a -> DsM a
- dsGetCompleteMatches :: DsM CompleteMatches
- type DsWarning = (SrcSpan, SDoc)
- diagnosticDs :: DsMessage -> DsM ()
- errDsCoreExpr :: DsMessage -> DsM CoreExpr
- failWithDs :: DsMessage -> DsM a
- failDs :: DsM a
- discardWarningsDs :: DsM a -> DsM a
- data DsMatchContext = DsMatchContext (HsMatchContext GhcRn) SrcSpan
- data EquationInfo = EqnInfo {}
- data MatchResult a
- = MR_Infallible (DsM a)
- | MR_Fallible (CoreExpr -> DsM a)
- runMatchResult :: CoreExpr -> MatchResult a -> DsM a
- type DsWrapper = CoreExpr -> CoreExpr
- idDsWrapper :: DsWrapper
- pprRuntimeTrace :: String -> SDoc -> CoreExpr -> DsM CoreExpr
Documentation
mapM :: (Traversable t, 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 monad.
initTcDsForSolver :: TcM a -> DsM a Source #
foldlM :: (Foldable t, Monad m) => (b -> a -> m b) -> b -> t a -> m b #
Monadic fold over the elements of a structure, associating to the left, i.e. from left to right.
foldrM :: (Foldable t, Monad m) => (a -> b -> m b) -> b -> t a -> m b #
Monadic fold over the elements of a structure, associating to the right, i.e. from right to left.
unsetGOptM :: GeneralFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a Source #
unsetWOptM :: WarningFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a Source #
class Functor f => Applicative (f :: Type -> Type) where #
A functor with application, providing operations to
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:
As a consequence of these laws, the Functor
instance for f
will satisfy
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
(which implies that pure
and <*>
satisfy the applicative functor laws).
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.
Using ApplicativeDo
: 'fs
' can be understood as
the <*>
asdo
expression
do f <- fs a <- as pure (f a)
liftA2 :: (a -> b -> c) -> f a -> f b -> f c #
Lift a binary function to actions.
Some functors support an implementation of liftA2
that is more
efficient than the default one. In particular, if fmap
is an
expensive operation, it is likely better to use liftA2
than to
fmap
over the structure and then use <*>
.
This became a typeclass method in 4.10.0.0. Prior to that, it was
a function defined in terms of <*>
and fmap
.
Using ApplicativeDo
: '
' can be understood
as the liftA2
f as bsdo
expression
do a <- as b <- bs pure (f a b)
(*>) :: f a -> f b -> f b infixl 4 #
Sequence actions, discarding the value of the first argument.
'as
' can be understood as the *>
bsdo
expression
do as bs
This is a tad complicated for our ApplicativeDo
extension
which will give it a Monad
constraint. For an Applicative
constraint we write it of the form
do _ <- as b <- bs pure b
(<*) :: f a -> f b -> f a infixl 4 #
Sequence actions, discarding the value of the second argument.
Using ApplicativeDo
: 'as
' can be understood as
the <*
bsdo
expression
do a <- as bs pure a
Instances
Applicative [] | Since: base-2.1 |
Applicative Maybe | Since: base-2.1 |
Applicative IO | Since: base-2.1 |
Applicative Par1 | Since: base-4.9.0.0 |
Applicative Q | |
Applicative Complex | Since: base-4.9.0.0 |
Applicative Min | Since: base-4.9.0.0 |
Applicative Max | Since: base-4.9.0.0 |
Applicative First | Since: base-4.9.0.0 |
Applicative Last | Since: base-4.9.0.0 |
Applicative Option | Since: base-4.9.0.0 |
Applicative ZipList | f <$> ZipList xs1 <*> ... <*> ZipList xsN = ZipList (zipWithN f xs1 ... xsN) where (\a b c -> stimes c [a, b]) <$> 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 |
Applicative Identity | Since: base-4.8.0.0 |
Applicative STM | Since: base-4.8.0.0 |
Applicative First | Since: base-4.8.0.0 |
Applicative Last | Since: base-4.8.0.0 |
Applicative Dual | Since: base-4.8.0.0 |
Applicative Sum | Since: base-4.8.0.0 |
Applicative Product | Since: base-4.8.0.0 |
Applicative Down | Since: base-4.11.0.0 |
Applicative ReadPrec | Since: base-4.6.0.0 |
Applicative ReadP | Since: base-4.6.0.0 |
Applicative NonEmpty | Since: base-4.9.0.0 |
Applicative PutM | |
Applicative Get | |
Applicative Tree | |
Applicative Seq | Since: containers-0.5.4 |
Applicative TcPluginM | |
Applicative CoreM | |
Applicative Ghc | |
Applicative Hsc | |
Applicative PV | |
Applicative P | |
Applicative Q | |
Applicative UnifyResultM | |
Defined in GHC.Core.Unify 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 Pair | |
Applicative UniqSM | |
Applicative Maybe | |
Applicative P | Since: base-4.5.0.0 |
Applicative PD Source # | |
Applicative NormM | |
Applicative SimplM Source # | |
Applicative RuleM | |
Applicative UM | |
Applicative NatM Source # | |
Applicative LiftM Source # | |
Applicative LintM | |
Applicative FCode Source # | |
Applicative CmmParse Source # | |
Applicative TcS Source # | |
Applicative CpsRn Source # | |
Applicative MatchResult Source # | Product is an "or" on falliblity---the combined match result is infallible only if the left and right argument match results both were. This is useful for combining a bunch of alternatives together and then
getting the overall falliblity of the entire group. See |
Defined in GHC.HsToCore.Monad pure :: a -> MatchResult a # (<*>) :: MatchResult (a -> b) -> MatchResult a -> MatchResult b # liftA2 :: (a -> b -> c) -> MatchResult a -> MatchResult b -> MatchResult c # (*>) :: MatchResult a -> MatchResult b -> MatchResult b # (<*) :: MatchResult a -> MatchResult b -> MatchResult a # | |
Applicative LlvmM Source # | |
Applicative HookedUse Source # | |
Applicative (Either e) | Since: base-3.0 |
Applicative (U1 :: Type -> Type) | Since: base-4.9.0.0 |
Monoid a => Applicative ((,) a) | For tuples, the ("hello ", (+15)) <*> ("world!", 2002) ("hello world!",2017) Since: base-2.1 |
Applicative (ST s) | Since: base-4.4.0.0 |
Monad m => Applicative (WrappedMonad m) | Since: base-2.1 |
Defined in Control.Applicative 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: base-4.6.0.0 |
Defined in Control.Arrow pure :: a0 -> ArrowMonad a a0 # (<*>) :: ArrowMonad a (a0 -> b) -> ArrowMonad a a0 -> ArrowMonad a b # liftA2 :: (a0 -> b -> c) -> ArrowMonad a a0 -> ArrowMonad a b -> ArrowMonad a c # (*>) :: ArrowMonad a a0 -> ArrowMonad a b -> ArrowMonad a b # (<*) :: ArrowMonad a a0 -> ArrowMonad a b -> ArrowMonad a a0 # | |
Applicative (Proxy :: Type -> Type) | Since: base-4.7.0.0 |
(Functor m, Monad m) => Applicative (MaybeT m) | |
Applicative m => Applicative (GhcT m) | |
Applicative (IOEnv m) | |
Monad m => Applicative (EwM m) | |
Applicative (CmdLineP s) | |
Defined in GHC.Driver.CmdLine | |
Applicative (MaybeErr err) | |
Defined in GHC.Data.Maybe | |
Applicative (State s) | |
Applicative m => Applicative (ListT m) | |
Applicative (SetM s) | |
Applicative (RegM freeRegs) Source # | |
Defined in GHC.CmmToAsm.Reg.Linear.State 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 (State s) Source # | |
Applicative f => Applicative (Rec1 f) | Since: base-4.9.0.0 |
(Monoid a, Monoid b) => Applicative ((,,) a b) | Since: base-4.14.0.0 |
Arrow a => Applicative (WrappedArrow a b) | Since: base-2.1 |
Defined in Control.Applicative pure :: a0 -> WrappedArrow a b a0 # (<*>) :: WrappedArrow a b (a0 -> b0) -> WrappedArrow a b a0 -> WrappedArrow a b b0 # liftA2 :: (a0 -> b0 -> c) -> WrappedArrow a b a0 -> WrappedArrow a b b0 -> WrappedArrow a b c # (*>) :: WrappedArrow a b a0 -> WrappedArrow a b b0 -> WrappedArrow a b b0 # (<*) :: WrappedArrow a b a0 -> WrappedArrow a b b0 -> WrappedArrow a b a0 # | |
Applicative m => Applicative (Kleisli m a) | Since: base-4.14.0.0 |
Defined in Control.Arrow | |
Monoid m => Applicative (Const m :: Type -> Type) | Since: base-2.0.1 |
Applicative f => Applicative (Ap f) | Since: base-4.12.0.0 |
Applicative f => Applicative (Alt f) | Since: base-4.8.0.0 |
(Applicative f, Monad f) => Applicative (WhenMissing f x) | Equivalent to Since: containers-0.5.9 |
Defined in Data.IntMap.Internal 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 # | |
(Functor m, Monad m) => Applicative (ExceptT e m) | |
Defined in Control.Monad.Trans.Except | |
Applicative (Stream m a) | |
Defined in GHC.Data.Stream | |
Monad m => Applicative (StreamS m a) | |
Defined in GHC.Data.Stream | |
Applicative m => Applicative (IdentityT m) | |
Defined in Control.Monad.Trans.Identity | |
(Functor m, Monad m) => Applicative (ErrorT e m) | |
Defined in Control.Monad.Trans.Error | |
Applicative m => Applicative (ReaderT r m) | |
Defined in Control.Monad.Trans.Reader | |
(Functor m, Monad m) => Applicative (StateT s m) | |
Defined in Control.Monad.Trans.State.Lazy | |
(Functor m, Monad m) => Applicative (StateT s m) | |
Defined in Control.Monad.Trans.State.Strict | |
(Monoid w, Applicative m) => Applicative (WriterT w m) | |
Defined in Control.Monad.Trans.Writer.Lazy | |
(Monoid w, Applicative m) => Applicative (WriterT w m) | |
Defined in Control.Monad.Trans.Writer.Strict | |
(Functor m, Monad m) => Applicative (WriterT w m) | |
Defined in Control.Monad.Trans.Writer.CPS | |
Applicative ((->) r :: Type -> Type) | Since: base-2.1 |
Monoid c => Applicative (K1 i c :: Type -> Type) | Since: base-4.12.0.0 |
(Applicative f, Applicative g) => Applicative (f :*: g) | Since: base-4.9.0.0 |
(Monoid a, Monoid b, Monoid c) => Applicative ((,,,) a b c) | Since: base-4.14.0.0 |
Defined in GHC.Base | |
(Applicative f, Applicative g) => Applicative (Product f g) | Since: base-4.9.0.0 |
Defined in Data.Functor.Product | |
(Monad f, Applicative f) => Applicative (WhenMatched f x y) | Equivalent to Since: containers-0.5.9 |
Defined in Data.IntMap.Internal 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 Since: containers-0.5.9 |
Defined in Data.Map.Internal 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 (ContT r m) | |
Applicative f => Applicative (M1 i c f) | Since: base-4.9.0.0 |
(Applicative f, Applicative g) => Applicative (f :.: g) | Since: base-4.9.0.0 |
(Applicative f, Applicative g) => Applicative (Compose f g) | Since: base-4.9.0.0 |
Defined in Data.Functor.Compose | |
(Monad f, Applicative f) => Applicative (WhenMatched f k x y) | Equivalent to Since: containers-0.5.9 |
Defined in Data.Map.Internal 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 # | |
(Monoid w, Functor m, Monad m) => Applicative (RWST r w s m) | |
Defined in Control.Monad.Trans.RWS.Lazy | |
(Monoid w, Functor m, Monad m) => Applicative (RWST r w s m) | |
Defined in Control.Monad.Trans.RWS.Strict |
(<$>) :: 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, <$>
is function
application lifted over a Functor
.
Examples
Convert from a
to a Maybe
Int
using Maybe
String
show
:
>>>
show <$> Nothing
Nothing>>>
show <$> Just 3
Just "3"
Convert from an
to an
Either
Int
Int
Either
Int
String
using show
:
>>>
show <$> 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)
putSrcSpanDsA :: SrcSpanAnn' ann -> DsM a -> DsM a Source #
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 Source #
getCCIndexDsM :: FastString -> DsM CostCentreIndex Source #
See getCCIndexM
.
getPmNablas :: DsM Nablas Source #
Get the current pattern match oracle state. See dsl_nablas
.
updPmNablas :: Nablas -> DsM a -> DsM a Source #
Set the pattern match oracle state within the scope of the given action.
See dsl_nablas
.
dsGetCompleteMatches :: DsM CompleteMatches Source #
The COMPLETE
pragmas that are in scope.
diagnosticDs :: DsMessage -> DsM () Source #
Emit a diagnostic for the current source location. In case the diagnostic is a warning,
the latter will be ignored and discarded if the relevant WarningFlag
is not set in the DynFlags.
See Note [Discarding Messages] in Error
.
errDsCoreExpr :: DsMessage -> DsM CoreExpr Source #
Issue an error, but return the expression for (), so that we can continue reporting errors.
failWithDs :: DsMessage -> DsM a Source #
discardWarningsDs :: DsM a -> DsM a Source #
data DsMatchContext Source #
Instances
Outputable DsMatchContext Source # | |
Defined in GHC.HsToCore.Monad ppr :: DsMatchContext -> SDoc # |
data EquationInfo Source #
EqnInfo | |
|
Instances
Outputable EquationInfo Source # | |
Defined in GHC.HsToCore.Monad ppr :: EquationInfo -> SDoc # |
data MatchResult a Source #
This is a value of type a with potentially a CoreExpr-shaped hole in it. This is used to deal with cases where we are potentially handling pattern match failure, and want to later specify how failure is handled.
MR_Infallible (DsM a) | We represent the case where there is no hole without a function from
|
MR_Fallible (CoreExpr -> DsM a) |
Instances
Functor MatchResult Source # | |
Defined in GHC.HsToCore.Monad fmap :: (a -> b) -> MatchResult a -> MatchResult b # (<$) :: a -> MatchResult b -> MatchResult a # | |
Applicative MatchResult Source # | Product is an "or" on falliblity---the combined match result is infallible only if the left and right argument match results both were. This is useful for combining a bunch of alternatives together and then
getting the overall falliblity of the entire group. See |
Defined in GHC.HsToCore.Monad pure :: a -> MatchResult a # (<*>) :: MatchResult (a -> b) -> MatchResult a -> MatchResult b # liftA2 :: (a -> b -> c) -> MatchResult a -> MatchResult b -> MatchResult c # (*>) :: MatchResult a -> MatchResult b -> MatchResult b # (<*) :: MatchResult a -> MatchResult b -> MatchResult a # |
runMatchResult :: CoreExpr -> MatchResult a -> DsM a Source #
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.