-- Typechecker types
TcTyThing(..), pprTcTyThingCategory,
- GadtRefinement,
-- Template Haskell
ThStage(..), topStage, topSpliceStage,
import HsSyn ( PendingSplice, HsOverLit, LRuleDecl, LForeignDecl,
ArithSeqInfo, DictBinds, LHsBinds, LImportDecl, HsGroup,
- IE )
+ HsWrapper, IE )
import HscTypes ( FixityEnv,
HscEnv, TypeEnv, TyThing,
GenAvailInfo(..), AvailInfo, HscSource(..),
availName, IsBootInterface, Deprecations )
import Packages ( PackageId )
import Type ( Type, pprTyThingCategory )
-import TcType ( TcTyVarSet, TcType, TcThetaType, SkolemInfo, TvSubst,
- TcPredType, TcKind, tcCmpPred, tcCmpType, tcCmpTypes, pprSkolInfo )
+import TcType ( TcTyVarSet, TcType, TcThetaType, SkolemInfo,
+ TcPredType, TcKind, tcCmpPred, tcCmpType,
+ tcCmpTypes, pprSkolInfo )
import InstEnv ( Instance, InstEnv )
+import FamInstEnv ( FamInstEnv )
import IOEnv
import RdrName ( GlobalRdrEnv, LocalRdrEnv )
import Name ( Name )
import SrcLoc ( SrcSpan, SrcLoc, Located, srcSpanStart )
import VarSet ( IdSet )
import ErrUtils ( Messages, Message )
-import UniqFM ( UniqFM )
import UniqSupply ( UniqSupply )
import BasicTypes ( IPName )
import Util ( thenCmp )
-- bound in this module when dealing with hi-boot recursions
-- Updated at intervals (e.g. after dealing with types and classes)
- tcg_inst_env :: InstEnv, -- Instance envt for *home-package* modules
- -- Includes the dfuns in tcg_insts
+ tcg_inst_env :: InstEnv, -- Instance envt for *home-package*
+ -- modules; Includes the dfuns in
+ -- tcg_insts
+ tcg_fam_inst_env :: FamInstEnv, -- Ditto for family instances
+
-- Now a bunch of things about this module that are simply
-- accumulated, but never consulted until the end.
-- Nevertheless, it's convenient to accumulate them along
tcl_lie :: TcRef LIE -- Place to accumulate type constraints
}
-type GadtRefinement = TvSubst
{- Note [Given Insts]
~~~~~~~~~~~~~~~~~~
data TcTyThing
= AGlobal TyThing -- Used only in the return type of a lookup
- | ATcId TcId -- Ids defined in this module; may not be fully zonked
- ThLevel
- Bool -- True <=> apply the type refinement to me
+ | ATcId { -- Ids defined in this module; may not be fully zonked
+ tct_id :: TcId,
+ tct_co :: Maybe HsWrapper, -- Nothing <=> Do not apply a GADT type refinement
+ -- I am wobbly, or have no free
+ -- type variables
+ -- Just co <=> Apply any type refinement to me,
+ -- and record it in the coercion
+ tct_type :: TcType, -- Type of (coercion applied to id)
+ tct_level :: ThLevel }
| ATyVar Name TcType -- The type to which the lexically scoped type vaiable
-- is currently refined. We only need the Name
instance Outputable TcTyThing where -- Debugging only
ppr (AGlobal g) = ppr g
- ppr (ATcId g tl rig) = text "Identifier" <>
- ifPprDebug (brackets (ppr g <> comma <> ppr tl <+> ppr rig))
+ ppr elt@(ATcId {}) = text "Identifier" <>
+ ifPprDebug (brackets (ppr (tct_id elt) <> dcolon <> ppr (tct_type elt) <> comma
+ <+> ppr (tct_level elt) <+> ppr (tct_co elt)))
ppr (ATyVar tv _) = text "Type variable" <+> quotes (ppr tv)
ppr (AThing k) = text "AThing" <+> ppr k
| RecordUpdOrigin
| InstScOrigin -- Typechecking superclasses of an instance declaration
| DerivOrigin -- Typechecking deriving
+ | StandAloneDerivOrigin -- Typechecking stand-alone deriving
| DefaultOrigin -- Typechecking a default decl
| DoOrigin -- Arising from a do expression
| ProcOrigin -- Arising from a proc expression
\begin{code}
pprInstLoc :: InstLoc -> SDoc
pprInstLoc (InstLoc orig locn _)
- = hsep [text "arising from", pp_orig orig, text "at", ppr locn]
+ = sep [text "arising from" <+> pp_orig orig,
+ text "at" <+> ppr locn]
where
pp_orig (OccurrenceOf name) = hsep [ptext SLIT("use of"), quotes (ppr name)]
pp_orig (IPOccOrigin name) = hsep [ptext SLIT("use of implicit parameter"), quotes (ppr name)]
pp_orig InstSigOrigin = ptext SLIT("instantiating a type signature")
pp_orig InstScOrigin = ptext SLIT("the superclasses of an instance declaration")
pp_orig DerivOrigin = ptext SLIT("the 'deriving' clause of a data type declaration")
+ pp_orig StandAloneDerivOrigin = ptext SLIT("a 'deriving' declaration")
pp_orig DefaultOrigin = ptext SLIT("a 'default' declaration")
pp_orig DoOrigin = ptext SLIT("a do statement")
pp_orig ProcOrigin = ptext SLIT("a proc expression")