GHC.Tc.Types

ghc-lib-parser-9.10.1.20250103: The GHC API, decoupled from GHC versions

Safe Haskell | Ignore
Language | GHC2021

GHC.Tc.Types

Description

Various types used during typechecking.

Please see GHC.Tc.Utils.Monad as well for operations on these types. You probably want to import it, instead of this module.

All the monads exported here are built on top of the same IOEnv monad. The monad functions like a Reader monad in the way it passes the environment around. This is done to allow the environment to be manipulated in a stack like fashion when entering expressions... etc.

For state that is global and should be returned at the end (e.g not part of the stack mechanism), you should use a TcRef (= IORef) to store them.

Synopsis

- type TcRnIf a b = IOEnv (Env a b)
- type TcRn = TcRnIf TcGblEnv TcLclEnv
- type TcM = TcRn
- type RnM = TcRn
- type IfM lcl = TcRnIf IfGblEnv lcl
- type IfL = IfM IfLclEnv
- type IfG = IfM ()
- type TcRef a = IORef a
- data Env gbl lcl = Env {
  - env_top :: !HscEnv
  - env_ut :: !Char
  - env_gbl :: gbl
  - env_lcl :: lcl
  }
- data TcGblEnv = TcGblEnv {
  - tcg_mod :: Module
  - tcg_semantic_mod :: Module
  - tcg_src :: HscSource
  - tcg_rdr_env :: GlobalRdrEnv
  - tcg_default :: Maybe [Type]
  - tcg_fix_env :: FixityEnv
  - tcg_type_env :: TypeEnv
  - tcg_type_env_var :: KnotVars (IORef TypeEnv)
  - tcg_inst_env :: !InstEnv
  - tcg_fam_inst_env :: !FamInstEnv
  - tcg_ann_env :: AnnEnv
  - tcg_exports :: [AvailInfo]
  - tcg_imports :: ImportAvails
  - tcg_dus :: DefUses
  - tcg_used_gres :: TcRef [GlobalRdrElt]
  - tcg_keep :: TcRef NameSet
  - tcg_th_used :: TcRef Bool
  - tcg_th_splice_used :: TcRef Bool
  - tcg_th_needed_deps :: TcRef ([Linkable], PkgsLoaded)
  - tcg_dfun_n :: TcRef OccSet
  - tcg_merged :: [(Module, Fingerprint)]
  - tcg_rn_exports :: Maybe [(LIE GhcRn, Avails)]
  - tcg_rn_imports :: [LImportDecl GhcRn]
  - tcg_rn_decls :: Maybe (HsGroup GhcRn)
  - tcg_dependent_files :: TcRef [FilePath]
  - tcg_th_topdecls :: TcRef [LHsDecl GhcPs]
  - tcg_th_foreign_files :: TcRef [(ForeignSrcLang, FilePath)]
  - tcg_th_topnames :: TcRef NameSet
  - tcg_th_modfinalizers :: TcRef [(TcLclEnv, ThModFinalizers)]
  - tcg_th_coreplugins :: TcRef [String]
  - tcg_th_state :: TcRef (Map TypeRep Dynamic)
  - tcg_th_remote_state :: TcRef (Maybe (ForeignRef (IORef QState)))
  - tcg_th_docs :: TcRef THDocs
  - tcg_ev_binds :: Bag EvBind
  - tcg_tr_module :: Maybe Id
  - tcg_binds :: LHsBinds GhcTc
  - tcg_sigs :: NameSet
  - tcg_imp_specs :: [LTcSpecPrag]
  - tcg_warns :: Warnings GhcRn
  - tcg_anns :: [Annotation]
  - tcg_tcs :: [TyCon]
  - tcg_ksigs :: NameSet
  - tcg_insts :: [ClsInst]
  - tcg_fam_insts :: [FamInst]
  - tcg_rules :: [LRuleDecl GhcTc]
  - tcg_fords :: [LForeignDecl GhcTc]
  - tcg_patsyns :: [PatSyn]
  - tcg_hdr_info :: (Maybe (LHsDoc GhcRn), Maybe (XRec GhcRn ModuleName))
  - tcg_hpc :: !AnyHpcUsage
  - tcg_self_boot :: SelfBootInfo
  - tcg_main :: Maybe Name
  - tcg_safe_infer :: TcRef Bool
  - tcg_safe_infer_reasons :: TcRef (Messages TcRnMessage)
  - tcg_tc_plugin_solvers :: [TcPluginSolver]
  - tcg_tc_plugin_rewriters :: UniqFM TyCon [TcPluginRewriter]
  - tcg_defaulting_plugins :: [FillDefaulting]
  - tcg_hf_plugins :: [HoleFitPlugin]
  - tcg_top_loc :: RealSrcSpan
  - tcg_static_wc :: TcRef WantedConstraints
  - tcg_complete_matches :: !CompleteMatches
  - tcg_cc_st :: TcRef CostCentreState
  - tcg_next_wrapper_num :: TcRef (ModuleEnv Int)
  }
- data TcLclEnv = TcLclEnv {
  - tcl_lcl_ctxt :: !TcLclCtxt
  - tcl_usage :: TcRef UsageEnv
  - tcl_lie :: TcRef WantedConstraints
  - tcl_errs :: TcRef (Messages TcRnMessage)
  }
- modifyLclCtxt :: (TcLclCtxt -> TcLclCtxt) -> TcLclEnv -> TcLclEnv
- data TcLclCtxt = TcLclCtxt {
  - tcl_loc :: RealSrcSpan
  - tcl_ctxt :: [ErrCtxt]
  - tcl_in_gen_code :: Bool
  - tcl_tclvl :: TcLevel
  - tcl_bndrs :: TcBinderStack
  - tcl_rdr :: LocalRdrEnv
  - tcl_th_ctxt :: ThStage
  - tcl_th_bndrs :: ThBindEnv
  - tcl_arrow_ctxt :: ArrowCtxt
  - tcl_env :: TcTypeEnv
  }
- setLclEnvTcLevel :: TcLevel -> TcLclEnv -> TcLclEnv
- getLclEnvTcLevel :: TcLclEnv -> TcLevel
- setLclEnvLoc :: RealSrcSpan -> TcLclEnv -> TcLclEnv
- getLclEnvLoc :: TcLclEnv -> RealSrcSpan
- lclEnvInGeneratedCode :: TcLclEnv -> Bool
- data IfGblEnv = IfGblEnv {
  - if_doc :: SDoc
  - if_rec_types :: KnotVars (IfG TypeEnv)
  }
- data IfLclEnv = IfLclEnv {
  - if_mod :: !Module
  - if_boot :: IsBootInterface
  - if_loc :: SDoc
  - if_nsubst :: Maybe NameShape
  - if_implicits_env :: Maybe TypeEnv
  - if_tv_env :: FastStringEnv TyVar
  - if_id_env :: FastStringEnv Id
  }
- tcVisibleOrphanMods :: TcGblEnv -> ModuleSet
- data RewriteEnv = RE {
  - re_loc :: !CtLoc
  - re_flavour :: !CtFlavour
  - re_eq_rel :: !EqRel
  - re_rewriters :: !(TcRef RewriterSet)
  }
- data FrontendResult = FrontendTypecheck TcGblEnv
- type ErrCtxt = (Bool, TidyEnv -> ZonkM (TidyEnv, SDoc))
- data ImportAvails = ImportAvails {
  - imp_mods :: ImportedMods
  - imp_direct_dep_mods :: InstalledModuleEnv ModuleNameWithIsBoot
  - imp_dep_direct_pkgs :: Set UnitId
  - imp_trust_own_pkg :: Bool
  - imp_trust_pkgs :: Set UnitId
  - imp_boot_mods :: InstalledModuleEnv ModuleNameWithIsBoot
  - imp_sig_mods :: [ModuleName]
  - imp_orphs :: [Module]
  - imp_finsts :: [Module]
  }
- emptyImportAvails :: ImportAvails
- plusImportAvails :: ImportAvails -> ImportAvails -> ImportAvails
- mkModDeps :: Set (UnitId, ModuleNameWithIsBoot) -> InstalledModuleEnv ModuleNameWithIsBoot
- type TcTypeEnv = NameEnv TcTyThing
- type TcBinderStack = [TcBinder]
- data TcBinder
  - = TcIdBndr TcId TopLevelFlag
  - | TcIdBndr_ExpType Name ExpType TopLevelFlag
  - | TcTvBndr Name TyVar
- data TcTyThing
  - = AGlobal TyThing
  - | ATcId {
    - tct_id :: Id
    - tct_info :: IdBindingInfo
    }
  - | ATyVar Name TcTyVar
  - | ATcTyCon TyCon
  - | APromotionErr PromotionErr
- tcTyThingTyCon_maybe :: TcTyThing -> Maybe TyCon
- data PromotionErr
  - = TyConPE
  - | ClassPE
  - | FamDataConPE
  - | ConstrainedDataConPE ThetaType
  - | PatSynPE
  - | RecDataConPE
  - | TermVariablePE
  - | TypeVariablePE
- data IdBindingInfo
  - = NotLetBound
  - | ClosedLet
  - | NonClosedLet RhsNames ClosedTypeId
- type ClosedTypeId = Bool
- type RhsNames = NameSet
- data IsGroupClosed = IsGroupClosed (NameEnv RhsNames) ClosedTypeId
- data SelfBootInfo
  - = NoSelfBoot
  - | SelfBoot {
    - sb_mds :: ModDetails
    }
- bootExports :: SelfBootInfo -> NameSet
- tcTyThingCategory :: TcTyThing -> String
- pprTcTyThingCategory :: TcTyThing -> SDoc
- peCategory :: PromotionErr -> String
- pprPECategory :: PromotionErr -> SDoc
- data CompleteMatch
- type CompleteMatches = [CompleteMatch]
- data ThStage
  - = Splice SpliceType
  - | RunSplice (TcRef [ForeignRef (Q ())])
  - | Comp
  - | Brack ThStage PendingStuff
- data SpliceType
  - = Typed
  - | Untyped
- data SpliceOrBracket
  - = IsSplice
  - | IsBracket
- data PendingStuff
  - = RnPendingUntyped (TcRef [PendingRnSplice])
  - | RnPendingTyped
  - | TcPending (TcRef [PendingTcSplice]) (TcRef WantedConstraints) QuoteWrapper
- topStage :: ThStage
- topAnnStage :: ThStage
- topSpliceStage :: ThStage
- type ThLevel = Int
- impLevel :: ThLevel
- outerLevel :: ThLevel
- thLevel :: ThStage -> ThLevel
- data ForeignSrcLang
  - = LangC
  - | LangCxx
  - | LangObjc
  - | LangObjcxx
  - | LangAsm
  - | LangJs
  - | RawObject
- type THDocs = Map DocLoc (HsDoc GhcRn)
- data DocLoc
  - = DeclDoc Name
  - | ArgDoc Name Int
  - | InstDoc Name
  - | ModuleDoc
- type ThBindEnv = NameEnv (TopLevelFlag, ThLevel)
- data ArrowCtxt
  - = NoArrowCtxt
  - | ArrowCtxt LocalRdrEnv (TcRef WantedConstraints)
- type TcSigFun = Name -> Maybe TcSigInfo
- data TcSigInfo
  - = TcIdSig TcIdSig
  - | TcPatSynSig TcPatSynSig
- data TcIdSig
  - = TcCompleteSig TcCompleteSig
  - | TcPartialSig TcPartialSig
- data TcCompleteSig = CSig {
  - sig_bndr :: TcId
  - sig_ctxt :: UserTypeCtxt
  - sig_loc :: SrcSpan
  }
- data TcPartialSig = PSig {
  - psig_name :: Name
  - psig_hs_ty :: LHsSigWcType GhcRn
  - psig_ctxt :: UserTypeCtxt
  - psig_loc :: SrcSpan
  }
- data TcPatSynSig = PatSig {
  - patsig_name :: Name
  - patsig_implicit_bndrs :: [InvisTVBinder]
  - patsig_univ_bndrs :: [InvisTVBinder]
  - patsig_req :: TcThetaType
  - patsig_ex_bndrs :: [InvisTVBinder]
  - patsig_prov :: TcThetaType
  - patsig_body_ty :: TcSigmaType
  }
- data TcIdSigInst = TISI {
  - sig_inst_sig :: TcIdSig
  - sig_inst_skols :: [(Name, InvisTVBinder)]
  - sig_inst_theta :: TcThetaType
  - sig_inst_tau :: TcSigmaType
  - sig_inst_wcs :: [(Name, TcTyVar)]
  - sig_inst_wcx :: Maybe TcType
  }
- isPartialSig :: TcIdSigInst -> Bool
- hasCompleteSig :: TcSigFun -> Name -> Bool
- tcSigInfoName :: TcSigInfo -> Name
- tcIdSigLoc :: TcIdSig -> SrcSpan
- completeSigPolyId_maybe :: TcSigInfo -> Maybe TcId
- type TcId = Id
- data NameShape = NameShape {
  - ns_mod_name :: ModuleName
  - ns_exports :: [AvailInfo]
  - ns_map :: OccEnv Name
  }
- removeBindingShadowing :: HasOccName a => [a] -> [a]
- getPlatform :: TcRnIf a b Platform
- data TcPlugin = TcPlugin {
  - tcPluginInit :: TcPluginM s
  - tcPluginSolve :: s -> TcPluginSolver
  - tcPluginRewrite :: s -> UniqFM TyCon TcPluginRewriter
  - tcPluginStop :: s -> TcPluginM ()
  }
- data TcPluginSolveResult where
  - TcPluginSolveResult {
    - tcPluginInsolubleCts :: [Ct]
    - tcPluginSolvedCts :: [(EvTerm, Ct)]
    - tcPluginNewCts :: [Ct]
    }
  - pattern TcPluginContradiction :: [Ct] -> TcPluginSolveResult
  - pattern TcPluginOk :: [(EvTerm, Ct)] -> [Ct] -> TcPluginSolveResult
- data TcPluginRewriteResult
  - = TcPluginNoRewrite
  - | TcPluginRewriteTo {
    - tcPluginReduction :: !Reduction
    - tcRewriterNewWanteds :: [Ct]
    }
- type TcPluginSolver = EvBindsVar -> [Ct] -> [Ct] -> TcPluginM TcPluginSolveResult
- type TcPluginRewriter = RewriteEnv -> [Ct] -> [TcType] -> TcPluginM TcPluginRewriteResult
- data TcPluginM a
- unsafeTcPluginTcM :: TcM a -> TcPluginM a
- data DefaultingPlugin = DefaultingPlugin {
  - dePluginInit :: TcPluginM s
  - dePluginRun :: s -> FillDefaulting
  - dePluginStop :: s -> TcPluginM ()
  }
- data DefaultingProposal = DefaultingProposal {
  - deProposals :: [[(TcTyVar, Type)]]
  - deProposalCts :: [Ct]
  }
- type FillDefaulting = WantedConstraints -> TcPluginM [DefaultingProposal]
- type RoleAnnotEnv = NameEnv (LRoleAnnotDecl GhcRn)
- emptyRoleAnnotEnv :: RoleAnnotEnv
- mkRoleAnnotEnv :: [LRoleAnnotDecl GhcRn] -> RoleAnnotEnv
- lookupRoleAnnot :: RoleAnnotEnv -> Name -> Maybe (LRoleAnnotDecl GhcRn)
- getRoleAnnots :: [Name] -> RoleAnnotEnv -> [LRoleAnnotDecl GhcRn]
- lintGblEnv :: Logger -> DynFlags -> TcGblEnv -> TcM ()
- data TcRnMessage

# Documentation

type TcRnIf a b = IOEnv (Env a b) #

type TcRn = TcRnIf TcGblEnv TcLclEnv #

type TcM = TcRn #

Historical "type-checking monad" (now it's just `TcRn`).

type RnM = TcRn #

Historical "renaming monad" (now it's just `TcRn`).

type IfM lcl = TcRnIf IfGblEnv lcl #

type IfL = IfM IfLclEnv #

type IfG = IfM () #

type TcRef a = IORef a #

Type alias for `IORef`; the convention is we'll use this for mutable bits of data in the typechecker which are updated during typechecking and returned at the end.

data Env gbl lcl #

Constructors

Env |
Fields env_top :: !HscEnv env_ut :: !Char env_gbl :: gbl env_lcl :: lcl

#### Instances

Instances details

ContainsDynFlags (Env gbl lcl) # |
Instance details Defined in GHC.Tc.Types Methods extractDynFlags :: Env gbl lcl -> DynFlags #
ContainsHooks (Env gbl lcl) # |
Instance details Defined in GHC.Tc.Types Methods extractHooks :: Env gbl lcl -> Hooks #
ContainsModule gbl => ContainsModule (Env gbl lcl) # |
Instance details Defined in GHC.Tc.Types Methods extractModule :: Env gbl lcl -> Module #
ContainsLogger (Env gbl lcl) # |
Instance details Defined in GHC.Tc.Types Methods extractLogger :: Env gbl lcl -> Logger #

data TcGblEnv #

`TcGblEnv` describes the top-level of the module at the point at which the typechecker is finished work. It is this structure that is handed on to the desugarer For state that needs to be updated during the typechecking phase and returned at end, use a `TcRef` (= `IORef`).

Constructors

TcGblEnv |
Fields tcg_mod :: Module Module being compiled tcg_semantic_mod :: Module If a signature, the backing module See also Note [Identity versus semantic module] tcg_src :: HscSource What kind of module (regular Haskell, hs-boot, hsig) tcg_rdr_env :: GlobalRdrEnv Top level envt; used during renaming tcg_default :: Maybe [Type] Types used for defaulting. `Nothing` => no `default` decl tcg_fix_env :: FixityEnv Just for things in this module tcg_type_env :: TypeEnv Global type env for the module we are compiling now. All TyCons and Classes (for this module) end up in here right away, along with their derived constructors, selectors. (Ids defined in this module start in the local envt, though they move to the global envt during zonking) NB: for what "things in this module" means, see Note [The interactive package] in GHC.Runtime.Context tcg_type_env_var :: KnotVars (IORef TypeEnv) tcg_inst_env :: !InstEnv Instance envt for all home-package modules; Includes the dfuns in tcg_insts NB. BangPattern is to fix a leak, see #15111 tcg_fam_inst_env :: !FamInstEnv Ditto for family instances NB. BangPattern is to fix a leak, see #15111 tcg_ann_env :: AnnEnv And for annotations tcg_exports :: [AvailInfo] What is exported tcg_imports :: ImportAvails Information about what was imported from where, including things bound in this module. Also store Safe Haskell info here about transitive trusted package requirements. There are not many uses of this field, so you can grep for all them. The ImportAvails records information about the following things: All of the modules you directly imported (tcRnImports) The orphans (only!) of all imported modules in a GHCi session (runTcInteractive) The module that instantiated a signature Each of the signatures that merged in It is used in the following ways: - imp_orphs is used to determine what orphan modules should be visible in the context (tcVisibleOrphanMods) - imp_finsts is used to determine what family instances should be visible (tcExtendLocalFamInstEnv) - To resolve the meaning of the export list of a module (tcRnExports) - imp_mods is used to compute usage info (mkIfaceTc, deSugar) - imp_trust_own_pkg is used for Safe Haskell in interfaces (mkIfaceTc, as well as in GHC.Driver.Main) - To create the Dependencies field in interface (mkDependencies) tcg_dus :: DefUses tcg_used_gres :: TcRef [GlobalRdrElt] INVARIANT: all these GREs were imported; that is, they all have a non-empty gre_imp field. tcg_keep :: TcRef NameSet tcg_th_used :: TcRef Bool `True` <=> Template Haskell syntax used. We need this so that we can generate a dependency on the Template Haskell package, because the desugarer is going to emit loads of references to TH symbols. The reference is implicit rather than explicit, so we have to zap a mutable variable. tcg_th_splice_used :: TcRef Bool `True` <=> A Template Haskell splice was used. Splices disable recompilation avoidance (see #481) tcg_th_needed_deps :: TcRef ([Linkable], PkgsLoaded) The set of runtime dependencies required by this module See Note [Object File Dependencies] tcg_dfun_n :: TcRef OccSet Allows us to choose unique DFun names. tcg_merged :: [(Module, Fingerprint)] The requirements we merged with; we always have to recompile if any of these changed. tcg_rn_exports :: Maybe [(LIE GhcRn, Avails)] tcg_rn_imports :: [LImportDecl GhcRn] tcg_rn_decls :: Maybe (HsGroup GhcRn) Renamed decls, maybe. `Nothing` <=> Don't retain renamed decls. tcg_dependent_files :: TcRef [FilePath] dependencies from addDependentFile tcg_th_topdecls :: TcRef [LHsDecl GhcPs] Top-level declarations from addTopDecls tcg_th_foreign_files :: TcRef [(ForeignSrcLang, FilePath)] Foreign files emitted from TH. tcg_th_topnames :: TcRef NameSet Exact names bound in top-level declarations in tcg_th_topdecls tcg_th_modfinalizers :: TcRef [(TcLclEnv, ThModFinalizers)] Template Haskell module finalizers. They can use particular local environments. tcg_th_coreplugins :: TcRef [String] Core plugins added by Template Haskell code. tcg_th_state :: TcRef (Map TypeRep Dynamic) tcg_th_remote_state :: TcRef (Maybe (ForeignRef (IORef QState))) Template Haskell state tcg_th_docs :: TcRef THDocs Docs added in Template Haskell via `putDoc`. tcg_ev_binds :: Bag EvBind tcg_tr_module :: Maybe Id tcg_binds :: LHsBinds GhcTc tcg_sigs :: NameSet tcg_imp_specs :: [LTcSpecPrag] tcg_warns :: Warnings GhcRn tcg_anns :: [Annotation] tcg_tcs :: [TyCon] tcg_ksigs :: NameSet tcg_insts :: [ClsInst] tcg_fam_insts :: [FamInst] tcg_rules :: [LRuleDecl GhcTc] tcg_fords :: [LForeignDecl GhcTc] tcg_patsyns :: [PatSyn] tcg_hdr_info :: (Maybe (LHsDoc GhcRn), Maybe (XRec GhcRn ModuleName)) Maybe Haddock header docs and Maybe located module name tcg_hpc :: !AnyHpcUsage `True` if any part of the prog uses hpc instrumentation. NB. BangPattern is to fix a leak, see #15111 tcg_self_boot :: SelfBootInfo Whether this module has a corresponding hi-boot file tcg_main :: Maybe Name The Name of the main function, if this module is the main module. tcg_safe_infer :: TcRef Bool Has the typechecker inferred this module as -XSafe (Safe Haskell)? See Note [Safe Haskell Overlapping Instances Implementation], although this is used for more than just that failure case. tcg_safe_infer_reasons :: TcRef (Messages TcRnMessage) Unreported reasons why tcg_safe_infer is False. INVARIANT: If this Messages is non-empty, then tcg_safe_infer is False. It may be that tcg_safe_infer is False but this is empty, if no reasons are supplied (#19714), or if those reasons have already been reported by GHC.Driver.Main.markUnsafeInfer tcg_tc_plugin_solvers :: [TcPluginSolver] A list of user-defined type-checking plugins for constraint solving. tcg_tc_plugin_rewriters :: UniqFM TyCon [TcPluginRewriter] A collection of all the user-defined type-checking plugins for rewriting type family applications, collated by their type family `TyCon`s. tcg_defaulting_plugins :: [FillDefaulting] A list of user-defined plugins for type defaulting plugins. tcg_hf_plugins :: [HoleFitPlugin] A list of user-defined plugins for hole fit suggestions. tcg_top_loc :: RealSrcSpan The RealSrcSpan this module came from tcg_static_wc :: TcRef WantedConstraints Wanted constraints of static forms. See Note [Constraints in static forms]. tcg_complete_matches :: !CompleteMatches Tracking indices for cost centre annotations tcg_cc_st :: TcRef CostCentreState tcg_next_wrapper_num :: TcRef (ModuleEnv Int) See Note [Generating fresh names for FFI wrappers]

#### Instances

Instances details

ContainsModule TcGblEnv # |
Instance details Defined in GHC.Tc.Types Methods extractModule :: TcGblEnv -> Module #

data TcLclEnv #

Constructors

TcLclEnv |
Fields tcl_lcl_ctxt :: !TcLclCtxt tcl_usage :: TcRef UsageEnv tcl_lie :: TcRef WantedConstraints tcl_errs :: TcRef (Messages TcRnMessage)

modifyLclCtxt :: (TcLclCtxt -> TcLclCtxt) -> TcLclEnv -> TcLclEnv #

data TcLclCtxt #

Constructors

TcLclCtxt |
Fields tcl_loc :: RealSrcSpan tcl_ctxt :: [ErrCtxt] tcl_in_gen_code :: Bool tcl_tclvl :: TcLevel tcl_bndrs :: TcBinderStack tcl_rdr :: LocalRdrEnv tcl_th_ctxt :: ThStage tcl_th_bndrs :: ThBindEnv tcl_arrow_ctxt :: ArrowCtxt tcl_env :: TcTypeEnv

setLclEnvTcLevel :: TcLevel -> TcLclEnv -> TcLclEnv #

getLclEnvTcLevel :: TcLclEnv -> TcLevel #

setLclEnvLoc :: RealSrcSpan -> TcLclEnv -> TcLclEnv #

getLclEnvLoc :: TcLclEnv -> RealSrcSpan #

lclEnvInGeneratedCode :: TcLclEnv -> Bool #

data IfGblEnv #

Constructors

IfGblEnv |
Fields if_doc :: SDoc if_rec_types :: KnotVars (IfG TypeEnv)

data IfLclEnv #

Constructors

IfLclEnv |
Fields if_mod :: !Module if_boot :: IsBootInterface if_loc :: SDoc if_nsubst :: Maybe NameShape if_implicits_env :: Maybe TypeEnv if_tv_env :: FastStringEnv TyVar if_id_env :: FastStringEnv Id

tcVisibleOrphanMods :: TcGblEnv -> ModuleSet #

data RewriteEnv #

A `RewriteEnv` carries the necessary context for performing rewrites (i.e. type family reductions and following filled-in metavariables) in the solver.

Constructors

RE |
Fields re_loc :: !CtLoc In which context are we rewriting? Type-checking plugins might want to use this location information when emitting new Wanted constraints when rewriting type family applications. This ensures that such Wanted constraints will, when unsolved, give rise to error messages with the correct source location. re_flavour :: !CtFlavour re_eq_rel :: !EqRel At what role are we rewriting? See Note [Rewriter EqRels] in GHC.Tc.Solver.Rewrite re_rewriters :: !(TcRef RewriterSet) See Note [Wanteds rewrite Wanteds]

data FrontendResult #

`FrontendResult` describes the result of running the frontend of a Haskell module. Currently one always gets a `FrontendTypecheck`, since running the frontend involves typechecking a program. hs-sig merges are not handled here.

This data type really should be in GHC.Driver.Env, but it needs to have a TcGblEnv which is only defined here.

Constructors

FrontendTypecheck TcGblEnv |

type ErrCtxt = (Bool, TidyEnv -> ZonkM (TidyEnv, SDoc)) #

Additional context to include in an error message, e.g. "In the type signature ...", "In the ambiguity check for ...", etc.

data ImportAvails #

`ImportAvails` summarises what was imported from where, irrespective of whether the imported things are actually used or not. It is used:

- when processing the export list,
- when constructing usage info for the interface file,
- to identify the list of directly imported modules for initialisation purposes and for optimised overlap checking of family instances,
- when figuring out what things are really unused

Constructors

ImportAvails |
Fields imp_mods :: ImportedMods Domain is all directly-imported modules See the documentation on ImportedModsVal in GHC.Unit.Module.Imported for the meaning of the fields. We need a full ModuleEnv rather than a ModuleNameEnv here, because we might be importing modules of the same name from different packages. (currently not the case, but might be in the future). imp_direct_dep_mods :: InstalledModuleEnv ModuleNameWithIsBoot Home-package modules directly imported by the module being compiled. imp_dep_direct_pkgs :: Set UnitId Packages directly needed by the module being compiled imp_trust_own_pkg :: Bool Do we require that our own package is trusted? This is to handle efficiently the case where a Safe module imports a Trustworthy module that resides in the same package as it. See Note [Trust Own Package] in GHC.Rename.Names imp_trust_pkgs :: Set UnitId This records the packages the current module needs to trust for Safe Haskell compilation to succeed. A package is required to be trusted if we are dependent on a trustworthy module in that package. See Note [Tracking Trust Transitively] in GHC.Rename.Names imp_boot_mods :: InstalledModuleEnv ModuleNameWithIsBoot Domain is all modules which have hs-boot files, and whether we should import the boot version of interface file. Only used in one-shot mode to populate eps_is_boot. imp_sig_mods :: [ModuleName] Signature modules below this one imp_orphs :: [Module] Orphan modules below us in the import tree (and maybe including us for imported modules) imp_finsts :: [Module] Family instance modules below us in the import tree (and maybe including us for imported modules)

emptyImportAvails :: ImportAvails #

plusImportAvails :: ImportAvails -> ImportAvails -> ImportAvails #

Union two ImportAvails

This function is a key part of Import handling, basically for each import we create a separate ImportAvails structure and then union them all together with this function.

mkModDeps :: Set (UnitId, ModuleNameWithIsBoot) -> InstalledModuleEnv ModuleNameWithIsBoot #

type TcTypeEnv = NameEnv TcTyThing #

type TcBinderStack = [TcBinder] #

data TcBinder #

Constructors

TcIdBndr TcId TopLevelFlag |
TcIdBndr_ExpType Name ExpType TopLevelFlag |
TcTvBndr Name TyVar |

#### Instances

Instances details

HasOccName TcBinder # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods occName :: TcBinder -> OccName #
Outputable TcBinder # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods ppr :: TcBinder -> SDoc #

data TcTyThing #

A typecheckable thing available in a local context. Could be `AGlobal` `TyThing`, but also lexically scoped variables, etc. See GHC.Tc.Utils.Env for how to retrieve a `TyThing` given a `Name`.

Constructors

AGlobal TyThing |
ATcId |
Fields tct_id :: Id tct_info :: IdBindingInfo
ATyVar Name TcTyVar |
ATcTyCon TyCon |
APromotionErr PromotionErr |

#### Instances

Instances details

Outputable TcTyThing # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods ppr :: TcTyThing -> SDoc #

tcTyThingTyCon_maybe :: TcTyThing -> Maybe TyCon #

Matches on either a global `TyCon` or a `TcTyCon`.

data PromotionErr #

Constructors

TyConPE |
ClassPE |
FamDataConPE |
ConstrainedDataConPE ThetaType |
PatSynPE |
RecDataConPE |
TermVariablePE |
TypeVariablePE |

#### Instances

Instances details

Generic PromotionErr # |
Instance details Defined in GHC.Tc.Errors.Types.PromotionErr Associated Types
type Rep PromotionErr |
Instance details Defined in GHC.Tc.Errors.Types.PromotionErr type Rep PromotionErr = D1 ('MetaData "PromotionErr" "GHC.Tc.Errors.Types.PromotionErr" "ghc-lib-parser-9.10.1.20250103-FaHJOkjTl0Y9STmjhYbIHo" 'False) (((C1 ('MetaCons "TyConPE" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "ClassPE" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "FamDataConPE" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "ConstrainedDataConPE" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ThetaType)))) :+: ((C1 ('MetaCons "PatSynPE" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "RecDataConPE" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "TermVariablePE" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "TypeVariablePE" 'PrefixI 'False) (U1 :: Type -> Type))))
Methods from :: PromotionErr -> Rep PromotionErr x # to :: Rep PromotionErr x -> PromotionErr #
Outputable PromotionErr # |
Instance details Defined in GHC.Tc.Errors.Types.PromotionErr Methods ppr :: PromotionErr -> SDoc #
type Rep PromotionErr # |
Instance details Defined in GHC.Tc.Errors.Types.PromotionErr type Rep PromotionErr = D1 ('MetaData "PromotionErr" "GHC.Tc.Errors.Types.PromotionErr" "ghc-lib-parser-9.10.1.20250103-FaHJOkjTl0Y9STmjhYbIHo" 'False) (((C1 ('MetaCons "TyConPE" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "ClassPE" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "FamDataConPE" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "ConstrainedDataConPE" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ThetaType)))) :+: ((C1 ('MetaCons "PatSynPE" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "RecDataConPE" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "TermVariablePE" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "TypeVariablePE" 'PrefixI 'False) (U1 :: Type -> Type))))

data IdBindingInfo #

IdBindingInfo describes how an Id is bound.

It is used for the following purposes: a) for static forms in `checkClosedInStaticForm` and b) to figure out when a nested binding can be generalised, in `decideGeneralisationPlan`.

Constructors

NotLetBound |
ClosedLet |
NonClosedLet RhsNames ClosedTypeId |

#### Instances

Instances details

Outputable IdBindingInfo # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods ppr :: IdBindingInfo -> SDoc #

type ClosedTypeId = Bool #

type RhsNames = NameSet #

data IsGroupClosed #

IsGroupClosed describes a group of mutually-recursive bindings

Constructors

IsGroupClosed (NameEnv RhsNames) ClosedTypeId |

data SelfBootInfo #

Constructors

NoSelfBoot |
SelfBoot |
Fields sb_mds :: ModDetails

bootExports :: SelfBootInfo -> NameSet #

tcTyThingCategory :: TcTyThing -> String #

pprTcTyThingCategory :: TcTyThing -> SDoc #

peCategory :: PromotionErr -> String #

pprPECategory :: PromotionErr -> SDoc #

data CompleteMatch #

A list of conlikes which represents a complete pattern match. These arise from `COMPLETE` signatures. See also Note [Implementation of COMPLETE pragmas].

#### Instances

Instances details

Outputable CompleteMatch # |
Instance details Defined in GHC.Types.CompleteMatch Methods ppr :: CompleteMatch -> SDoc #

type CompleteMatches = [CompleteMatch] #

data ThStage #

Constructors

Splice SpliceType |
RunSplice (TcRef [ForeignRef (Q ())]) |
Comp |
Brack ThStage PendingStuff |

#### Instances

Instances details

Outputable ThStage # |
Instance details Defined in GHC.Tc.Types.TH Methods ppr :: ThStage -> SDoc #

data SpliceType #

Constructors

Typed |
Untyped |

data SpliceOrBracket #

Constructors

IsSplice |
IsBracket |

data PendingStuff #

Constructors

RnPendingUntyped (TcRef [PendingRnSplice]) |
RnPendingTyped |
TcPending (TcRef [PendingTcSplice]) (TcRef WantedConstraints) QuoteWrapper |

topStage :: ThStage #

topAnnStage :: ThStage #

topSpliceStage :: ThStage #

type ThLevel = Int #

impLevel :: ThLevel #

outerLevel :: ThLevel #

thLevel :: ThStage -> ThLevel #

data ForeignSrcLang #

Foreign formats supported by GHC via TH

Constructors

LangC | C
LangCxx | C++
LangObjc | Objective C
LangObjcxx | Objective C++
LangAsm | Assembly language (.s)
LangJs | JavaScript
RawObject | Object (.o)

#### Instances

Instances details

Binary ForeignSrcLang # |
Instance details Defined in GHC.ForeignSrcLang Methods put :: ForeignSrcLang -> Put # get :: Get ForeignSrcLang # putList :: [ForeignSrcLang] -> Put #
Generic ForeignSrcLang # |
Instance details Defined in GHC.ForeignSrcLang.Type Associated Types
type Rep ForeignSrcLang |
Instance details Defined in GHC.ForeignSrcLang.Type type Rep ForeignSrcLang = D1 ('MetaData "ForeignSrcLang" "GHC.ForeignSrcLang.Type" "ghc-lib-parser-9.10.1.20250103-FaHJOkjTl0Y9STmjhYbIHo" 'False) ((C1 ('MetaCons "LangC" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "LangCxx" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "LangObjc" 'PrefixI 'False) (U1 :: Type -> Type))) :+: ((C1 ('MetaCons "LangObjcxx" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "LangAsm" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "LangJs" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "RawObject" 'PrefixI 'False) (U1 :: Type -> Type))))
Methods from :: ForeignSrcLang -> Rep ForeignSrcLang x # to :: Rep ForeignSrcLang x -> ForeignSrcLang #
Show ForeignSrcLang # |
Instance details Defined in GHC.ForeignSrcLang.Type Methods showsPrec :: Int -> ForeignSrcLang -> ShowS # show :: ForeignSrcLang -> String # showList :: [ForeignSrcLang] -> ShowS #
Eq ForeignSrcLang # |
Instance details Defined in GHC.ForeignSrcLang.Type Methods (==) :: ForeignSrcLang -> ForeignSrcLang -> Bool # (/=) :: ForeignSrcLang -> ForeignSrcLang -> Bool #
type Rep ForeignSrcLang # |
Instance details Defined in GHC.ForeignSrcLang.Type type Rep ForeignSrcLang = D1 ('MetaData "ForeignSrcLang" "GHC.ForeignSrcLang.Type" "ghc-lib-parser-9.10.1.20250103-FaHJOkjTl0Y9STmjhYbIHo" 'False) ((C1 ('MetaCons "LangC" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "LangCxx" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "LangObjc" 'PrefixI 'False) (U1 :: Type -> Type))) :+: ((C1 ('MetaCons "LangObjcxx" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "LangAsm" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "LangJs" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "RawObject" 'PrefixI 'False) (U1 :: Type -> Type))))

type THDocs = Map DocLoc (HsDoc GhcRn) #

The current collection of docs that Template Haskell has built up via putDoc.

data DocLoc #

This is a mirror of Template Haskell's DocLoc, but the TH names are resolved to GHC names.

Constructors

DeclDoc Name |
ArgDoc Name Int |
InstDoc Name |
ModuleDoc |

#### Instances

Instances details

Eq DocLoc # |
Instance details Defined in GHC.Tc.Types Methods (==) :: DocLoc -> DocLoc -> Bool # (/=) :: DocLoc -> DocLoc -> Bool #
Ord DocLoc # |
Instance details Defined in GHC.Tc.Types Methods compare :: DocLoc -> DocLoc -> Ordering # (<) :: DocLoc -> DocLoc -> Bool # (<=) :: DocLoc -> DocLoc -> Bool # (>) :: DocLoc -> DocLoc -> Bool # (>=) :: DocLoc -> DocLoc -> Bool # max :: DocLoc -> DocLoc -> DocLoc # min :: DocLoc -> DocLoc -> DocLoc #

type ThBindEnv = NameEnv (TopLevelFlag, ThLevel) #

data ArrowCtxt #

Constructors

NoArrowCtxt |
ArrowCtxt LocalRdrEnv (TcRef WantedConstraints) |

type TcSigFun = Name -> Maybe TcSigInfo #

data TcSigInfo #

Constructors

TcIdSig TcIdSig |
TcPatSynSig TcPatSynSig |

#### Instances

Instances details

Outputable TcSigInfo # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods ppr :: TcSigInfo -> SDoc #

data TcIdSig #

Constructors

TcCompleteSig TcCompleteSig |
TcPartialSig TcPartialSig |

#### Instances

Instances details

Outputable TcIdSig # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods ppr :: TcIdSig -> SDoc #

data TcCompleteSig #

Constructors

CSig |
Fields sig_bndr :: TcId sig_ctxt :: UserTypeCtxt sig_loc :: SrcSpan

#### Instances

Instances details

Outputable TcCompleteSig # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods ppr :: TcCompleteSig -> SDoc #

data TcPartialSig #

Constructors

PSig |
Fields psig_name :: Name psig_hs_ty :: LHsSigWcType GhcRn psig_ctxt :: UserTypeCtxt psig_loc :: SrcSpan

#### Instances

Instances details

Outputable TcPartialSig # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods ppr :: TcPartialSig -> SDoc #

data TcPatSynSig #

Constructors

PatSig |
Fields patsig_name :: Name patsig_implicit_bndrs :: [InvisTVBinder] patsig_univ_bndrs :: [InvisTVBinder] patsig_req :: TcThetaType patsig_ex_bndrs :: [InvisTVBinder] patsig_prov :: TcThetaType patsig_body_ty :: TcSigmaType

#### Instances

Instances details

Outputable TcPatSynSig # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods ppr :: TcPatSynSig -> SDoc #

data TcIdSigInst #

Constructors

TISI |
Fields sig_inst_sig :: TcIdSig sig_inst_skols :: [(Name, InvisTVBinder)] sig_inst_theta :: TcThetaType sig_inst_tau :: TcSigmaType sig_inst_wcs :: [(Name, TcTyVar)] sig_inst_wcx :: Maybe TcType

#### Instances

Instances details

Outputable TcIdSigInst # |
Instance details Defined in GHC.Tc.Types.BasicTypes Methods ppr :: TcIdSigInst -> SDoc #

isPartialSig :: TcIdSigInst -> Bool #

hasCompleteSig :: TcSigFun -> Name -> Bool #

No signature or a partial signature

tcSigInfoName :: TcSigInfo -> Name #

tcIdSigLoc :: TcIdSig -> SrcSpan #

completeSigPolyId_maybe :: TcSigInfo -> Maybe TcId #

type TcId = Id #

data NameShape #

A `NameShape` is a substitution on `Name`s that can be used to refine the identities of a hole while we are renaming interfaces (see GHC.Iface.Rename). Specifically, a `NameShape` for `ns_module_name` `A`, defines a mapping from `{A.T}` (for some `OccName` `T`) to some arbitrary other `Name`.

The most intriguing thing about a `NameShape`, however, is how it's constructed. A `NameShape` is *implied* by the exported `AvailInfo`s of the implementor of an interface: if an implementor of signature `<H>` exports `M.T`, you implicitly define a substitution from `{H.T}` to `M.T`. So a `NameShape` is computed from the list of `AvailInfo`s that are exported by the implementation of a module, or successively merged together by the export lists of signatures which are joining together.

It's not the most obvious way to go about doing this, but it does seem to work!

NB: Can't boot this and put it in NameShape because then we start pulling in too many DynFlags things.

Constructors

NameShape |
Fields ns_mod_name :: ModuleName ns_exports :: [AvailInfo] ns_map :: OccEnv Name

removeBindingShadowing :: HasOccName a => [a] -> [a] #

getPlatform :: TcRnIf a b Platform #

Get target platform

data TcPlugin #

Constructors

TcPlugin |
Fields tcPluginInit :: TcPluginM s Initialize plugin, when entering type-checker. tcPluginSolve :: s -> TcPluginSolver Solve some constraints. This function will be invoked at two points in the constraint solving process: once to simplify Given constraints, and once to solve Wanted constraints. In the first case (and only in the first case), no Wanted constraints will be passed to the plugin. The plugin can either return a contradiction, or specify that it has solved some constraints (with evidence), and possibly emit additional constraints. These returned constraints must be Givens in the first case, and Wanteds in the second. Use `\ _ _ _ _ -> pure $ TcPluginOk [] []` if your plugin does not provide this functionality. tcPluginRewrite :: s -> UniqFM TyCon TcPluginRewriter Rewrite saturated type family applications. The plugin is expected to supply a mapping from type family names to rewriting functions. For each type family `TyCon`, the plugin should provide a function which takes in the given constraints and arguments of a saturated type family application, and return a possible rewriting. See `TcPluginRewriter` for the expected shape of such a function. Use `\ _ -> emptyUFM` if your plugin does not provide this functionality. tcPluginStop :: s -> TcPluginM () Clean up after the plugin, when exiting the type-checker.

data TcPluginSolveResult #

Result of running a solver plugin.

Constructors

TcPluginSolveResult |
Fields tcPluginInsolubleCts :: [Ct] Insoluble constraints found by the plugin. These constraints will be added to the inert set, and reported as insoluble to the user. tcPluginSolvedCts :: [(EvTerm, Ct)] Solved constraints, together with their evidence. These are removed from the inert set, and the evidence for them is recorded. tcPluginNewCts :: [Ct] New constraints that the plugin wishes to emit. These will be added to the work list.

Bundled Patterns

pattern TcPluginContradiction :: [Ct] -> TcPluginSolveResult | The plugin found a contradiction. The returned constraints are removed from the inert set, and recorded as insoluble. The returned list of constraints should never be empty.
pattern TcPluginOk :: [(EvTerm, Ct)] -> [Ct] -> TcPluginSolveResult | The plugin has not found any contradictions, The first field is for constraints that were solved. The second field contains new work, that should be processed by the constraint solver.

data TcPluginRewriteResult #

Constructors

TcPluginNoRewrite | The plugin does not rewrite the type family application.
TcPluginRewriteTo | The plugin rewrites the type family application providing a rewriting together with evidence: a `Reduction`, which contains the rewritten type together with a `Coercion` whose right-hand-side type is the rewritten type. The plugin can also emit additional Wanted constraints.
Fields tcPluginReduction :: !Reduction tcRewriterNewWanteds :: [Ct]

type TcPluginSolver #

Arguments

= EvBindsVar |
-> [Ct] | Givens
-> [Ct] | Wanteds
-> TcPluginM TcPluginSolveResult |

The `solve` function of a type-checking plugin takes in Given and Wanted constraints, and should return a `TcPluginSolveResult` indicating which Wanted constraints it could solve, or whether any are insoluble.

type TcPluginRewriter #

Arguments

= RewriteEnv | Rewriter environment
-> [Ct] | Givens
-> [TcType] | type family arguments
-> TcPluginM TcPluginRewriteResult |

For rewriting type family applications, a type-checking plugin provides a function of this type for each type family `TyCon`.

The function is provided with the current set of Given constraints, together with the arguments to the type family. The type family application will always be fully saturated.

data TcPluginM a #

`TcPluginM` is the monad in which type-checking plugins operate.

#### Instances

Instances details

Applicative TcPluginM # |
Instance details Defined in GHC.Tc.Types 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 #
Functor TcPluginM # |
Instance details Defined in GHC.Tc.Types Methods fmap :: (a -> b) -> TcPluginM a -> TcPluginM b # (<$) :: a -> TcPluginM b -> TcPluginM a #
Monad TcPluginM # |
Instance details Defined in GHC.Tc.Types Methods (>>=) :: TcPluginM a -> (a -> TcPluginM b) -> TcPluginM b # (>>) :: TcPluginM a -> TcPluginM b -> TcPluginM b # return :: a -> TcPluginM a #
MonadFail TcPluginM # |
Instance details Defined in GHC.Tc.Types Methods fail :: String -> TcPluginM a #

unsafeTcPluginTcM :: TcM a -> TcPluginM a #

This function provides an escape for direct access to the `TcM` monad. It should not be used lightly, and the provided `TcPluginM` API should be favoured instead.

data DefaultingPlugin #

A plugin for controlling defaulting.

Constructors

DefaultingPlugin |
Fields dePluginInit :: TcPluginM s Initialize plugin, when entering type-checker. dePluginRun :: s -> FillDefaulting Default some types dePluginStop :: s -> TcPluginM () Clean up after the plugin, when exiting the type-checker.

data DefaultingProposal #

A collection of candidate default types for sets of type variables.

Constructors

DefaultingProposal |
Fields deProposals :: [[(TcTyVar, Type)]] The type variable assignments to try. deProposalCts :: [Ct] The constraints against which defaults are checked.

#### Instances

Instances details

Outputable DefaultingProposal # |
Instance details Defined in GHC.Tc.Types Methods ppr :: DefaultingProposal -> SDoc #

type FillDefaulting = WantedConstraints -> TcPluginM [DefaultingProposal] #

type RoleAnnotEnv = NameEnv (LRoleAnnotDecl GhcRn) #

emptyRoleAnnotEnv :: RoleAnnotEnv #

mkRoleAnnotEnv :: [LRoleAnnotDecl GhcRn] -> RoleAnnotEnv #

lookupRoleAnnot :: RoleAnnotEnv -> Name -> Maybe (LRoleAnnotDecl GhcRn) #

getRoleAnnots :: [Name] -> RoleAnnotEnv -> [LRoleAnnotDecl GhcRn] #

lintGblEnv :: Logger -> DynFlags -> TcGblEnv -> TcM () #

Check the `TcGblEnv` for consistency. Currently, only checks axioms, but should check other aspects, too.

data TcRnMessage #

An error which might arise during typechecking/renaming.

#### Instances

Instances details

Generic TcRnMessage # |
Instance details Defined in GHC.Tc.Errors.Types Associated Types
type Rep TcRnMessage |
Instance details Defined in GHC.Tc.Errors.Types type Rep TcRnMessage = D1 ('MetaData "TcRnMessage" "GHC.Tc.Errors.Types" "ghc-lib-parser-9.10.1.20250103-FaHJOkjTl0Y9STmjhYbIHo" 'False) ((((((((C1 ('MetaCons "TcRnUnknownMessage" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (UnknownDiagnostic (DiagnosticOpts TcRnMessage)))) :+: C1 ('MetaCons "TcRnInterfaceError" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 IfaceMessage))) :+: (C1 ('MetaCons "TcRnMessageWithInfo" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 UnitState) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TcRnMessageDetailed)) :+: C1 ('MetaCons "TcRnWithHsDocContext" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 HsDocContext) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TcRnMessage)))) :+: ((C1 ('MetaCons "TcRnSolverReport" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 SolverReportWithCtxt) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 DiagnosticReason)) :+: C1 ('MetaCons "TcRnSolverDepthError" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 SubGoalDepth))) :+: (C1 ('MetaCons "TcRnRedundantConstraints" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Id]) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (SkolemInfoAnon, Bool))) :+: (C1 ('MetaCons "TcRnInaccessibleCode" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Implication) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 SolverReportWithCtxt)) :+: C1 ('MetaCons "TcRnInaccessibleCoAxBranch" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyCon) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 CoAxBranch)))))) :+: (((C1 ('MetaCons "TcRnTypeDoesNotHaveFixedRuntimeRep" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 FixedRuntimeRepProvenance) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 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Methods from :: TcRnMessage -> Rep TcRnMessage x # to :: Rep TcRnMessage x -> TcRnMessage #
Diagnostic TcRnMessage # |
Instance details Defined in GHC.Tc.Errors.Ppr Associated Types
type DiagnosticOpts TcRnMessage |
Instance details Defined in GHC.Tc.Errors.Ppr type DiagnosticOpts TcRnMessage = TcRnMessageOpts
Methods diagnosticMessage :: DiagnosticOpts TcRnMessage -> TcRnMessage -> DecoratedSDoc # diagnosticReason :: TcRnMessage -> DiagnosticReason # diagnosticHints :: TcRnMessage -> [GhcHint] # diagnosticCode :: TcRnMessage -> Maybe DiagnosticCode #
type Rep TcRnMessage # |
Instance details Defined in GHC.Tc.Errors.Types type Rep TcRnMessage = D1 ('MetaData "TcRnMessage" "GHC.Tc.Errors.Types" "ghc-lib-parser-9.10.1.20250103-FaHJOkjTl0Y9STmjhYbIHo" 'False) ((((((((C1 ('MetaCons "TcRnUnknownMessage" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (UnknownDiagnostic (DiagnosticOpts TcRnMessage)))) :+: C1 ('MetaCons "TcRnInterfaceError" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 IfaceMessage))) :+: (C1 ('MetaCons "TcRnMessageWithInfo" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 UnitState) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TcRnMessageDetailed)) :+: C1 ('MetaCons "TcRnWithHsDocContext" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 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type DiagnosticOpts TcRnMessage # |
Instance details Defined in GHC.Tc.Errors.Ppr type DiagnosticOpts TcRnMessage = TcRnMessageOpts