Safe Haskell	Ignore
Language	GHC2021

GHC.Tc.Gen.Pat

Description

Typechecking patterns

Synopsis

tcLetPat :: (Name -> Maybe TcId) -> LetBndrSpec -> LPat GhcRn -> Scaled ExpSigmaTypeFRR -> TcM a -> TcM (LPat GhcTc, a)
newLetBndr :: LetBndrSpec -> Name -> Mult -> TcType -> TcM TcId
data LetBndrSpec
- = LetLclBndr
- | LetGblBndr TcPragEnv
tcCheckPat :: HsMatchContextRn -> LPat GhcRn -> Scaled TcSigmaTypeFRR -> TcM a -> TcM (LPat GhcTc, a)
tcCheckPat_O :: HsMatchContextRn -> CtOrigin -> LPat GhcRn -> Scaled TcSigmaTypeFRR -> TcM a -> TcM (LPat GhcTc, a)
tcInferPat :: FixedRuntimeRepContext -> HsMatchContextRn -> LPat GhcRn -> TcM a -> TcM ((LPat GhcTc, a), TcSigmaTypeFRR)
tcMatchPats :: forall a. HsMatchContextRn -> [LPat GhcRn] -> [ExpPatType] -> TcM a -> TcM ([LPat GhcTc], a)
addDataConStupidTheta :: DataCon -> [TcType] -> TcM ()
isIrrefutableHsPatRnTcM :: Bool -> LPat GhcRn -> TcM Bool

Documentation

tcLetPat :: (Name -> Maybe TcId) -> LetBndrSpec -> LPat GhcRn -> Scaled ExpSigmaTypeFRR -> TcM a -> TcM (LPat GhcTc, a) Source #

newLetBndr :: LetBndrSpec -> Name -> Mult -> TcType -> TcM TcId Source #

data LetBndrSpec Source #

Constructors

LetLclBndr
LetGblBndr TcPragEnv

Instances

Instances details

Outputable LetBndrSpec Source #
Instance details Defined in GHC.Tc.Gen.Pat Methods ppr :: LetBndrSpec -> SDoc #

tcCheckPat :: HsMatchContextRn -> LPat GhcRn -> Scaled TcSigmaTypeFRR -> TcM a -> TcM (LPat GhcTc, a) Source #

tcCheckPat_O Source #

Arguments

:: HsMatchContextRn
-> CtOrigin	origin to use if the type needs inst'ing
-> LPat GhcRn
-> Scaled TcSigmaTypeFRR
-> TcM a
-> TcM (LPat GhcTc, a)

A variant of tcPat that takes a custom origin

tcInferPat :: FixedRuntimeRepContext -> HsMatchContextRn -> LPat GhcRn -> TcM a -> TcM ((LPat GhcTc, a), TcSigmaTypeFRR) Source #

tcMatchPats Source #

Arguments

:: forall a. HsMatchContextRn
-> [LPat GhcRn]	patterns
-> [ExpPatType]	types of the patterns
-> TcM a	checker for the body
-> TcM ([LPat GhcTc], a)

addDataConStupidTheta :: DataCon -> [TcType] -> TcM () Source #

isIrrefutableHsPatRnTcM :: Bool -> LPat GhcRn -> TcM Bool Source #

Very similar to GHC.Tc.Pat.isIrrefutableHsPat, but doesn't typecheck the pattern It does depend on the type checker monad (TcM) however as we need to check ConPat case in more detail. Specifically, we call tcLookupGlobal to obtain constructor details from global packages for a comprehensive irrefutability check and avoid false negatives. (testcase pattern-fails.hs)