-- Kind checking
kcHsTyVar, kcHsTyVars, mkTyClTyVars,
- kcHsType, kcHsSigType, kcHsLiftedSigType, kcHsContext,
- tcTyVars, tcHsTyVars, mkImmutTyVars,
+ kcHsType, kcHsSigType, kcHsSigTypes,
+ kcHsLiftedSigType, kcHsContext,
+ tcScopedTyVars, tcHsTyVars, mkImmutTyVars,
TcSigInfo(..), tcTySig, mkTcSig, maybeSig,
checkSigTyVars, sigCtxt, sigPatCtxt
tcGetGlobalTyVars, tcEnvTcIds, tcEnvTyVars,
TyThing(..), TcTyThing(..), tcExtendKindEnv
)
-import TcType ( TcKind, TcTyVar, TcThetaType, TcTauType,
- newKindVar, tcInstSigVar,
- zonkKindEnv, zonkTcType, zonkTcTyVars, zonkTcTyVar
+import TcMType ( newKindVar, tcInstSigVars,
+ zonkKindEnv, zonkTcType, zonkTcTyVars, zonkTcTyVar,
+ unifyKind, unifyOpenTypeKind
)
-import Inst ( Inst, InstOrigin(..), newMethodWithGivenTy, instToId )
-import FunDeps ( grow )
-import TcUnify ( unifyKind, unifyOpenTypeKind )
-import Unify ( allDistinctTyVars )
-import Type ( Type, Kind, PredType(..), ThetaType, SigmaType, TauType,
+import TcType ( Type, Kind, SourceType(..), ThetaType, SigmaType, TauType,
mkTyVarTy, mkTyVarTys, mkFunTy, mkSynTy,
- zipFunTys, hoistForAllTys,
+ tcSplitForAllTys, tcSplitRhoTy,
+ hoistForAllTys, allDistinctTyVars,
+ zipFunTys,
mkSigmaTy, mkPredTy, mkTyConApp,
- mkAppTys, splitForAllTys, splitRhoTy, mkRhoTy,
+ mkAppTys, mkRhoTy,
liftedTypeKind, unliftedTypeKind, mkArrowKind,
- mkArrowKinds, getTyVar_maybe, getTyVar, splitFunTy_maybe,
+ mkArrowKinds, tcGetTyVar_maybe, tcGetTyVar, tcSplitFunTy_maybe,
tidyOpenType, tidyOpenTypes, tidyTyVar, tidyTyVars,
tyVarsOfType, tyVarsOfPred, mkForAllTys,
- isUnboxedTupleType, isForAllTy, isIPPred
+ isUnboxedTupleType, tcIsForAllTy, isIPPred
)
+import Inst ( Inst, InstOrigin(..), newMethodWithGivenTy, instToId )
+import FunDeps ( grow )
import PprType ( pprType, pprTheta, pprPred )
import Subst ( mkTopTyVarSubst, substTy )
import CoreFVs ( idFreeTyVars )
a::(*->*)-> *, b::*->*
\begin{code}
+-- tcHsTyVars is used for type variables in type signatures
+-- e.g. forall a. a->a
+-- They are immutable, because they scope only over the signature
+-- They may or may not be explicitly-kinded
tcHsTyVars :: [HsTyVarBndr Name]
-> TcM a -- The kind checker
-> ([TyVar] -> TcM b)
in
tcExtendTyVarEnv tyvars (thing_inside tyvars)
-tcTyVars :: [Name]
- -> TcM a -- The kind checker
- -> TcM [TyVar]
-tcTyVars [] kind_check = returnTc []
-
-tcTyVars tv_names kind_check
+-- tcScopedTyVars is used for scoped type variables
+-- e.g. \ (x::a) (y::a) -> x+y
+-- They never have explicit kinds (because this is source-code only)
+-- They are mutable (because they can get bound to a more specific type)
+tcScopedTyVars :: [Name]
+ -> TcM a -- The kind checker
+ -> TcM b
+ -> TcM b
+tcScopedTyVars [] kind_check thing_inside = thing_inside
+
+tcScopedTyVars tv_names kind_check thing_inside
= mapNF_Tc newNamedKindVar tv_names `thenTc` \ kind_env ->
tcExtendKindEnv kind_env kind_check `thenTc_`
zonkKindEnv kind_env `thenNF_Tc` \ tvs_w_kinds ->
- listNF_Tc [tcNewSigTyVar name kind | (name,kind) <- tvs_w_kinds]
+ listTc [tcNewMutTyVar name kind | (name, kind) <- tvs_w_kinds] `thenNF_Tc` \ tyvars ->
+ tcExtendTyVarEnv tyvars thing_inside
\end{code}
---------------------------
kcHsSigType, kcHsLiftedSigType :: RenamedHsType -> TcM ()
-- Used for type signatures
-kcHsSigType = kcTypeType
+kcHsSigType = kcTypeType
+kcHsSigTypes tys = mapTc_ kcHsSigType tys
kcHsLiftedSigType = kcLiftedType
---------------------------
kcTypeType ty2 `thenTc_`
returnTc liftedTypeKind
+kcHsType (HsNumTy _) -- The unit type for generics
+ = returnTc liftedTypeKind
+
kcHsType ty@(HsOpTy ty1 op ty2)
= kcTyVar op `thenTc` \ op_kind ->
kcHsType ty1 `thenTc` \ ty1_kind ->
---------------------------
kcAppKind fun_kind arg_kind
- = case splitFunTy_maybe fun_kind of
+ = case tcSplitFunTy_maybe fun_kind of
Just (arg_kind', res_kind)
-> unifyKind arg_kind arg_kind' `thenTc_`
returnTc res_kind
\begin{code}
tcHsSigType, tcHsLiftedSigType :: RenamedHsType -> TcM Type
-- Do kind checking, and hoist for-alls to the top
-tcHsSigType ty = kcTypeType ty `thenTc_` tcHsType ty
+tcHsSigType ty = kcTypeType ty `thenTc_` tcHsType ty
tcHsLiftedSigType ty = kcLiftedType ty `thenTc_` tcHsType ty
tcHsType :: RenamedHsType -> TcM Type
= tc_type wimp_out ty1 `thenTc` \ tau_ty1 ->
-- Function argument can be polymorphic, but
-- must not be an unboxed tuple
- checkTc (not (isUnboxedTupleType tau_ty1))
+ --
+ -- In a recursive loop we can't ask whether the thing is
+ -- unboxed -- might be a synonym inside a synonym inside a group
+ checkTc (isRec wimp_out || not (isUnboxedTupleType tau_ty1))
(ubxArgTyErr ty1) `thenTc_`
tc_type wimp_out ty2 `thenTc` \ tau_ty2 ->
returnTc (mkFunTy tau_ty1 tau_ty2)
= tc_type wimp_out arg_ty
| otherwise
- = tc_type wimp_out arg_ty `thenTc` \ arg_ty' ->
- checkTc (not (isForAllTy arg_ty')) (polyArgTyErr arg_ty) `thenTc_`
- checkTc (not (isUnboxedTupleType arg_ty')) (ubxArgTyErr arg_ty) `thenTc_`
+ = tc_type wimp_out arg_ty `thenTc` \ arg_ty' ->
+ checkTc (isRec wimp_out || not (tcIsForAllTy arg_ty')) (polyArgTyErr arg_ty) `thenTc_`
+ checkTc (isRec wimp_out || not (isUnboxedTupleType arg_ty')) (ubxArgTyErr arg_ty) `thenTc_`
returnTc arg_ty'
tc_arg_types wimp_out arg_tys = mapTc (tc_arg_type wimp_out) arg_tys
-- typechecking the rest of the program with the function bound
-- to a pristine type, namely sigma_tc_ty
let
- (tyvars, rho) = splitForAllTys (idType poly_id)
+ (tyvars, rho) = tcSplitForAllTys (idType poly_id)
in
- mapNF_Tc tcInstSigVar tyvars `thenNF_Tc` \ tyvars' ->
+ tcInstSigVars tyvars `thenNF_Tc` \ tyvars' ->
-- Make *signature* type variables
let
tyvar_tys' = mkTyVarTys tyvars'
rho' = substTy (mkTopTyVarSubst tyvars tyvar_tys') rho
-- mkTopTyVarSubst because the tyvars' are fresh
- (theta', tau') = splitRhoTy rho'
+
+ (theta', tau') = tcSplitRhoTy rho'
-- This splitRhoTy tries hard to make sure that tau' is a type synonym
-- wherever possible, which can improve interface files.
in
checkTcM (allDistinctTyVars sig_tys globals)
(complain sig_tys globals) `thenTc_`
- returnTc (map (getTyVar "checkSigTyVars") sig_tys)
+ returnTc (map (tcGetTyVar "checkSigTyVars") sig_tys)
where
complain sig_tys globals
let
in_scope_assoc = [ (zonked_tv, in_scope_tv)
| (z_ty, in_scope_tv) <- in_scope_tys `zip` in_scope_tvs,
- Just zonked_tv <- [getTyVar_maybe z_ty]
+ Just zonked_tv <- [tcGetTyVar_maybe z_ty]
]
in_scope_env = mkVarEnv in_scope_assoc
in
-- ty is what you get if you zonk sig_tyvar and then tidy it
--
-- acc maps a zonked type variable back to a signature type variable
- = case getTyVar_maybe ty of {
+ = case tcGetTyVar_maybe ty of {
Nothing -> -- Error (a)!
- returnNF_Tc (tidy_env, acc, unify_msg sig_tyvar (ppr ty) : msgs) ;
+ returnNF_Tc (tidy_env, acc, unify_msg sig_tyvar (quotes (ppr ty)) : msgs) ;
Just tv ->
case lookupVarEnv acc tv of {
Just sig_tyvar' -> -- Error (b) or (d)!
- returnNF_Tc (tidy_env, acc, unify_msg sig_tyvar (ppr sig_tyvar') : msgs) ;
+ returnNF_Tc (tidy_env, acc, unify_msg sig_tyvar thing : msgs)
+ where
+ thing = ptext SLIT("another quantified type variable") <+> quotes (ppr sig_tyvar')
- Nothing ->
+ ; Nothing ->
if tv `elemVarSet` globals -- Error (c)! Type variable escapes
-- The least comprehensible, so put it last
vcat_first 0 (x:xs) = text "...others omitted..."
vcat_first n (x:xs) = x $$ vcat_first (n-1) xs
-unify_msg tv thing = mk_msg tv <+> ptext SLIT("is unified with") <+> quotes thing
+unify_msg tv thing = mk_msg tv <+> ptext SLIT("is unified with") <+> thing
mk_msg tv = ptext SLIT("Quantified type variable") <+> quotes (ppr tv)
\end{code}
projects / ghc-hetmet.git / blobdiff