Safe Haskell	Safe-Inferred
Language	Haskell2010

GHC.Tc.Errors.Hole.FitTypes

Synopsis

data TypedHole = TypedHole {
- th_relevant_cts :: Cts
- th_implics :: [Implication]
- th_hole :: Maybe Hole
}
data HoleFit
- = HoleFit {
  - hfId :: Id
  - hfCand :: HoleFitCandidate
  - hfType :: TcType
  - hfRefLvl :: Int
  - hfWrap :: [TcType]
  - hfMatches :: [TcType]
  - hfDoc :: Maybe HsDocString
  }
- | RawHoleFit SDoc
data HoleFitCandidate
- = IdHFCand Id
- | NameHFCand Name
- | GreHFCand GlobalRdrElt
type CandPlugin = TypedHole -> [HoleFitCandidate] -> TcM [HoleFitCandidate]
type FitPlugin = TypedHole -> [HoleFit] -> TcM [HoleFit]
data HoleFitPlugin = HoleFitPlugin {
- candPlugin :: CandPlugin
- fitPlugin :: FitPlugin
}
data HoleFitPluginR = forall s.HoleFitPluginR {
- hfPluginInit :: TcM (TcRef s)
- hfPluginRun :: TcRef s -> HoleFitPlugin
- hfPluginStop :: TcRef s -> TcM ()
}
hfIsLcl :: HoleFit -> Bool
pprHoleFitCand :: HoleFitCandidate -> SDoc

Documentation

data TypedHole Source #

Constructors

TypedHole
Fields th_relevant_cts :: Cts Any relevant Cts to the hole th_implics :: [Implication] The nested implications of the hole with the innermost implication first. th_hole :: Maybe Hole The hole itself, if available. Only for debugging.

Instances

Instances details

Outputable TypedHole #
Instance details Defined in GHC.Tc.Errors.Hole.FitTypes Methods ppr :: TypedHole -> SDoc Source #

data HoleFit Source #

HoleFit is the type we use for valid hole fits. It contains the element that was checked, the Id of that element as found by tcLookup, and the refinement level of the fit, which is the number of extra argument holes that this fit uses (e.g. if hfRefLvl is 2, the fit is for `Id _ _`).

Constructors

HoleFit
Fields hfId :: Id The elements id in the TcM hfCand :: HoleFitCandidate The candidate that was checked. hfType :: TcType The type of the id, possibly zonked. hfRefLvl :: Int The number of holes in this fit. hfWrap :: [TcType] The wrapper for the match. hfMatches :: [TcType] What the refinement variables got matched with, if anything hfDoc :: Maybe HsDocString Documentation of this HoleFit, if available.
RawHoleFit SDoc	A fit that is just displayed as is. Here so thatHoleFitPlugins can inject any fit they want.

Instances

Instances details

Outputable HoleFit #
Instance details Defined in GHC.Tc.Errors.Hole.FitTypes Methods ppr :: HoleFit -> SDoc Source #
Eq HoleFit #
Instance details Defined in GHC.Tc.Errors.Hole.FitTypes Methods (==) :: HoleFit -> HoleFit -> Bool # (/=) :: HoleFit -> HoleFit -> Bool #
Ord HoleFit #
Instance details Defined in GHC.Tc.Errors.Hole.FitTypes Methods compare :: HoleFit -> HoleFit -> Ordering # (<) :: HoleFit -> HoleFit -> Bool # (<=) :: HoleFit -> HoleFit -> Bool # (>) :: HoleFit -> HoleFit -> Bool # (>=) :: HoleFit -> HoleFit -> Bool # max :: HoleFit -> HoleFit -> HoleFit # min :: HoleFit -> HoleFit -> HoleFit #

data HoleFitCandidate Source #

HoleFitCandidates are passed to hole fit plugins and then checked whether they fit a given typed-hole.

Constructors

IdHFCand Id
NameHFCand Name
GreHFCand GlobalRdrElt

Instances

Instances details

NamedThing HoleFitCandidate #
Instance details Defined in GHC.Tc.Errors.Hole.FitTypes Methods getOccName :: HoleFitCandidate -> OccName Source # getName :: HoleFitCandidate -> Name Source #
HasOccName HoleFitCandidate #
Instance details Defined in GHC.Tc.Errors.Hole.FitTypes Methods occName :: HoleFitCandidate -> OccName Source #
Outputable HoleFitCandidate #
Instance details Defined in GHC.Tc.Errors.Hole.FitTypes Methods ppr :: HoleFitCandidate -> SDoc Source #
Eq HoleFitCandidate #
Instance details Defined in GHC.Tc.Errors.Hole.FitTypes Methods (==) :: HoleFitCandidate -> HoleFitCandidate -> Bool # (/=) :: HoleFitCandidate -> HoleFitCandidate -> Bool #
Ord HoleFitCandidate #
Instance details Defined in GHC.Tc.Errors.Hole.FitTypes Methods compare :: HoleFitCandidate -> HoleFitCandidate -> Ordering # (<) :: HoleFitCandidate -> HoleFitCandidate -> Bool # (<=) :: HoleFitCandidate -> HoleFitCandidate -> Bool # (>) :: HoleFitCandidate -> HoleFitCandidate -> Bool # (>=) :: HoleFitCandidate -> HoleFitCandidate -> Bool # max :: HoleFitCandidate -> HoleFitCandidate -> HoleFitCandidate # min :: HoleFitCandidate -> HoleFitCandidate -> HoleFitCandidate #

type CandPlugin = TypedHole -> [HoleFitCandidate] -> TcM [HoleFitCandidate] Source #

A plugin for modifying the candidate hole fits *before* they're checked.

type FitPlugin = TypedHole -> [HoleFit] -> TcM [HoleFit] Source #

A plugin for modifying hole fits *after* they've been found.

data HoleFitPlugin Source #

A HoleFitPlugin is a pair of candidate and fit plugins.

Constructors

HoleFitPlugin
Fields candPlugin :: CandPlugin fitPlugin :: FitPlugin

data HoleFitPluginR Source #

HoleFitPluginR adds a TcRef to hole fit plugins so that plugins can track internal state. Note the existential quantification, ensuring that the state cannot be modified from outside the plugin.

Constructors

forall s. HoleFitPluginR
Fields hfPluginInit :: TcM (TcRef s) Initializes the TcRef to be passed to the plugin hfPluginRun :: TcRef s -> HoleFitPlugin The function defining the plugin itself hfPluginStop :: TcRef s -> TcM () Cleanup of state, guaranteed to be called even on error

hfIsLcl :: HoleFit -> Bool Source #

pprHoleFitCand :: HoleFitCandidate -> SDoc Source #