%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[RnSource]{Main pass of renamer}
\begin{code}
-#include "HsVersions.h"
-
-module RnSource ( rnSource, rnTyDecl, rnClassDecl, rnInstDecl, rnPolyType ) where
+module RnSource ( rnDecl, rnSourceDecls, rnHsType, rnHsSigType ) where
-IMP_Ubiq()
-IMPORT_DELOOPER(RnLoop) -- *check* the RnPass/RnExpr/RnBinds loop-breaking
+#include "HsVersions.h"
+import RnExpr
import HsSyn
import HsPragmas
-import RdrHsSyn
+import HsTypes ( hsTyVarNames, pprHsContext )
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, mkRdrNameWkr )
+import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl,
+ extractRuleBndrsTyVars, extractHsTyRdrTyVars,
+ extractHsCtxtRdrTyVars, extractGenericPatTyVars
+ )
import RnHsSyn
+import HsCore
+
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs )
+import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName,
+ lookupOrigNames, lookupSysBinder, newLocalsRn,
+ bindLocalsFVRn, bindUVarRn,
+ bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn,
+ bindCoreLocalFVRn, bindCoreLocalsFVRn, bindLocalNames,
+ checkDupOrQualNames, checkDupNames,
+ FreeVars, emptyFVs, plusFV, plusFVs, unitFV,
+ addOneFV, mapFvRn
+ )
import RnMonad
-import RnBinds ( rnTopBinds, rnMethodBinds )
-import RnUtils ( getLocalsFromRnEnv, lookupGlobalRnEnv, lubExportFlag )
-
-import Bag ( emptyBag, unitBag, consBag, unionManyBags, unionBags, listToBag, bagToList )
-import Class ( derivableClassKeys )
-import CmdLineOpts ( opt_CompilingGhcInternals )
-import ErrUtils ( addErrLoc, addShortErrLocLine, addShortWarnLocLine )
-import FiniteMap ( emptyFM, lookupFM, addListToFM_C )
-import Id ( GenId{-instance NamedThing-} )
-import ListSetOps ( unionLists, minusList )
-import Maybes ( maybeToBool, catMaybes )
-import Name ( isLocallyDefined, isLexVarId, getLocalName, ExportFlag(..),
- nameImportFlag, RdrName, pprNonSym, Name )
-import Outputable -- ToDo:rm
-import PprStyle -- ToDo:rm
-import Pretty
+
+import FunDeps ( oclose )
+import Class ( FunDep, DefMeth (..) )
+import Name ( Name, OccName, nameOccName, NamedThing(..) )
+import NameSet
+import OccName ( mkDefaultMethodOcc, isTvOcc )
+import FiniteMap ( elemFM )
+import PrelInfo ( derivableClassKeys, cCallishClassKeys )
+import PrelNames ( deRefStablePtr_RDR, makeStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR
+ )
+import Bag ( bagToList )
+import List ( partition, nub )
+import Outputable
import SrcLoc ( SrcLoc )
-import TyCon ( tyConDataCons, TyCon{-instance NamedThing-} )
-import Unique ( Unique )
-import UniqFM ( emptyUFM, addListToUFM_C, listToUFM, plusUFM, lookupUFM, eltsUFM )
-import UniqSet ( SYN_IE(UniqSet) )
-import Util ( isIn, isn'tIn, thenCmp, sortLt, removeDups, mapAndUnzip3, cmpPString,
- panic, assertPanic, pprTrace{-ToDo:rm-} )
+import CmdLineOpts ( DynFlags, DynFlag(..) )
+ -- Warn of unused for-all'd tyvars
+import Unique ( Uniquable(..) )
+import ErrUtils ( Message )
+import CStrings ( isCLabelString )
+import ListSetOps ( minusList, removeDupsEq )
\end{code}
-rnSource `renames' the source module and export list.
+@rnDecl@ `renames' declarations.
It simultaneously performs dependency analysis and precedence parsing.
It also does the following error checks:
\begin{enumerate}
\item
Checks that tyvars are used properly. This includes checking
for undefined tyvars, and tyvars in contexts that are ambiguous.
+(Some of this checking has now been moved to module @TcMonoType@,
+since we don't have functional dependency information at this point.)
\item
Checks that all variable occurences are defined.
\item
-Checks the (..) etc constraints in the export list.
+Checks the @(..)@ etc constraints in the export list.
\end{enumerate}
-\begin{code}
-rnSource :: [Module] -- imported modules
- -> Bag (Module,RnName) -- unqualified imports from module
- -> Bag RenamedFixityDecl -- fixity info for imported names
- -> RdrNameHsModule
- -> RnM s (RenamedHsModule,
- Name -> ExportFlag, -- export info
- Bag (RnName, RdrName)) -- occurrence info
-
-rnSource imp_mods unqual_imps imp_fixes
- (HsModule mod version exports _ fixes
- ty_decls specdata_sigs class_decls
- inst_decls specinst_sigs defaults
- binds _ src_loc)
-
- = pushSrcLocRn src_loc $
+%*********************************************************
+%* *
+\subsection{Value declarations}
+%* *
+%*********************************************************
- rnExports (mod:imp_mods) unqual_imps exports `thenRn` \ exported_fn ->
- rnFixes fixes `thenRn` \ src_fixes ->
- let
- all_fixes = src_fixes ++ bagToList imp_fixes
- all_fixes_fm = listToUFM (map pair_name all_fixes)
+\begin{code}
+rnSourceDecls :: [RdrNameHsDecl] -> RnMS ([RenamedHsDecl], FreeVars)
+ -- The decls get reversed, but that's ok
- pair_name inf = (fixDeclName inf, inf)
- in
- setExtraRn all_fixes_fm $
-
- mapRn rnTyDecl ty_decls `thenRn` \ new_ty_decls ->
- mapRn rnSpecDataSig specdata_sigs `thenRn` \ new_specdata_sigs ->
- mapRn rnClassDecl class_decls `thenRn` \ new_class_decls ->
- mapRn rnInstDecl inst_decls `thenRn` \ new_inst_decls ->
- mapRn rnSpecInstSig specinst_sigs `thenRn` \ new_specinst_sigs ->
- rnDefaultDecl defaults `thenRn` \ new_defaults ->
- rnTopBinds binds `thenRn` \ new_binds ->
-
- getOccurrenceUpRn `thenRn` \ occ_info ->
-
- returnRn (
- HsModule mod version
- trashed_exports trashed_imports all_fixes
- new_ty_decls new_specdata_sigs new_class_decls
- new_inst_decls new_specinst_sigs new_defaults
- new_binds [] src_loc,
- exported_fn,
- occ_info
- )
+rnSourceDecls decls
+ = go emptyFVs [] decls
where
- trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing
- trashed_imports = {-trace "rnSource:trashed_imports"-} []
+ -- Fixity and deprecations have been dealt with already; ignore them
+ go fvs ds' [] = returnRn (ds', fvs)
+ go fvs ds' (FixD _:ds) = go fvs ds' ds
+ go fvs ds' (DeprecD _:ds) = go fvs ds' ds
+ go fvs ds' (d:ds) = rnDecl d `thenRn` \(d', fvs') ->
+ go (fvs `plusFV` fvs') (d':ds') ds
\end{code}
%*********************************************************
%* *
-\subsection{Export list}
+\subsection{Value declarations}
%* *
%*********************************************************
\begin{code}
-rnExports :: [Module]
- -> Bag (Module,RnName)
- -> Maybe [RdrNameIE]
- -> RnM s (Name -> ExportFlag)
-
-rnExports mods unqual_imps Nothing
- = returnRn (\n -> if isLocallyDefined n then ExportAll else NotExported)
-
-rnExports mods unqual_imps (Just exps)
- = getModuleRn `thenRn` \ this_mod ->
- getRnEnv `thenRn` \ rn_env ->
- mapAndUnzipRn (rnIE mods) exps `thenRn` \ (mod_maybes, exp_bags) ->
- let
- (tc_bags, val_bags) = unzip exp_bags
- tc_names = bagToList (unionManyBags tc_bags)
- val_names = bagToList (unionManyBags val_bags)
- exp_mods = catMaybes mod_maybes
-
- -- Warn for duplicate names and modules
- (_, dup_tc_names) = removeDups cmp_fst tc_names
- (_, dup_val_names) = removeDups cmp_fst val_names
- cmp_fst (x,_) (y,_) = x `cmp` y
-
- (uniq_mods, dup_mods) = removeDups cmpPString exp_mods
- (expmods_this, expmods_imps) = partition (== this_mod) uniq_mods
-
- -- Get names for module This_Mod export
- (this_tcs, this_vals)
- = if null expmods_this
- then ([], [])
- else getLocalsFromRnEnv rn_env
-
- -- Get names for exported imported modules
- (mod_tcs, mod_vals, empty_mods)
- = case mapAndUnzip3 get_mod_names expmods_imps of
- (tcs, vals, emptys) -> (concat tcs, concat vals, catMaybes emptys)
-
- (unqual_tcs, unqual_vals) = partition (isRnTyConOrClass.snd) (bagToList unqual_imps)
-
- get_mod_names mod
- = (tcs, vals, empty_mod)
- where
- tcs = [(getName rn, nameImportFlag (getName rn))
- | (mod',rn) <- unqual_tcs, mod == mod']
- vals = [(getName rn, nameImportFlag (getName rn))
- | (mod',rn) <- unqual_vals, mod == mod']
- empty_mod = if null tcs && null vals
- then Just mod
- else Nothing
-
- -- Build finite map of exported names to export flag
- tc_map0 = addListToUFM_C lub_expflag emptyUFM (map pair_fst tc_names)
- tc_map1 = addListToUFM_C lub_expflag tc_map0 (map pair_fst mod_tcs)
- tc_map = addListToUFM_C lub_expflag tc_map1 (map (pair_fst.exp_all) this_tcs)
-
- val_map0 = addListToUFM_C lub_expflag emptyUFM (map pair_fst val_names)
- val_map1 = addListToUFM_C lub_expflag val_map0 (map pair_fst mod_vals)
- val_map = addListToUFM_C lub_expflag val_map1 (map (pair_fst.exp_all) this_vals)
-
- pair_fst pr@(n,_) = (n,pr)
- exp_all rn = (getName rn, ExportAll)
- lub_expflag (n, flag1) (_, flag2) = (n, lubExportFlag flag1 flag2)
-
- -- Check for exporting of duplicate local names
- tc_locals = [(getLocalName n, n) | (n,_) <- eltsUFM tc_map]
- val_locals = [(getLocalName n, n) | (n,_) <- eltsUFM val_map]
- (_, dup_tc_locals) = removeDups cmp_local tc_locals
- (_, dup_val_locals) = removeDups cmp_local val_locals
- cmp_local (x,_) (y,_) = x `cmpPString` y
-
- -- Build export flag function
- final_exp_map = plusUFM tc_map val_map
- exp_fn n = case lookupUFM final_exp_map n of
- Nothing -> NotExported
- Just (_,flag) -> flag
- in
- getSrcLocRn `thenRn` \ src_loc ->
- mapRn (addWarnRn . dupNameExportWarn src_loc) dup_tc_names `thenRn_`
- mapRn (addWarnRn . dupNameExportWarn src_loc) dup_val_names `thenRn_`
- mapRn (addWarnRn . dupModExportWarn src_loc) dup_mods `thenRn_`
- mapRn (addWarnRn . emptyModExportWarn src_loc) empty_mods `thenRn_`
- mapRn (addErrRn . dupLocalsExportErr src_loc) dup_tc_locals `thenRn_`
- mapRn (addErrRn . dupLocalsExportErr src_loc) dup_val_locals `thenRn_`
- returnRn exp_fn
-
-
-rnIE mods (IEVar name)
- = lookupValue name `thenRn` \ rn ->
- checkIEVar rn `thenRn` \ exps ->
- returnRn (Nothing, exps)
- where
- checkIEVar (RnName n) = returnRn (emptyBag, unitBag (n,ExportAll))
- checkIEVar (WiredInId i) = returnRn (emptyBag, unitBag (getName i, ExportAll))
- checkIEVar rn@(RnClassOp _ _) = getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn (emptyBag, emptyBag) (classOpExportErr rn src_loc)
- checkIEVar rn@(RnField _ _) = getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn (emptyBag, emptyBag) (fieldExportErr rn src_loc)
- checkIEVar rn = --pprTrace "rnIE:IEVar:panic? ToDo?:" (ppr PprDebug rn) $
- returnRn (emptyBag, emptyBag)
-
-rnIE mods (IEThingAbs name)
- = lookupTyConOrClass name `thenRn` \ rn ->
- checkIEAbs rn `thenRn` \ exps ->
- returnRn (Nothing, exps)
- where
- checkIEAbs (RnSyn n) = returnRn (unitBag (n,ExportAbs), emptyBag)
- checkIEAbs (RnData n _ _) = returnRn (unitBag (n,ExportAbs), emptyBag)
- checkIEAbs (RnClass n _) = returnRn (unitBag (n,ExportAbs), emptyBag)
- checkIEAbs (WiredInTyCon t) = returnRn (unitBag (getName t,ExportAbs), emptyBag)
- checkIEAbs rn = --pprTrace "rnIE:IEAbs:panic? ToDo?:" (ppr PprDebug rn) $
- returnRn (emptyBag, emptyBag)
-
-rnIE mods (IEThingAll name)
- = lookupTyConOrClass name `thenRn` \ rn ->
- checkIEAll rn `thenRn` \ exps ->
- checkImportAll rn `thenRn_`
- returnRn (Nothing, exps)
- where
- checkIEAll (RnData n cons fields)
- = returnRn (unitBag (exp_all n),
- listToBag (map exp_all cons) `unionBags` listToBag (map exp_all fields))
-
- checkIEAll (WiredInTyCon t)
- = returnRn (unitBag (exp_all (getName t)), listToBag (map exp_all cons))
- where
- cons = map getName (tyConDataCons t)
-
- checkIEAll (RnClass n ops)
- = returnRn (unitBag (exp_all n), listToBag (map exp_all ops))
- checkIEAll rn@(RnSyn n)
- = getSrcLocRn `thenRn` \ src_loc ->
- warnAndContinueRn (unitBag (n, ExportAbs), emptyBag)
- (synAllExportErr False{-warning-} rn src_loc)
-
- checkIEAll rn = pprTrace "rnIE:IEAll:panic? ToDo?:" (ppr PprDebug rn) $
- returnRn (emptyBag, emptyBag)
-
- exp_all n = (n, ExportAll)
-
-rnIE mods (IEThingWith name names)
- = lookupTyConOrClass name `thenRn` \ rn ->
- mapRn lookupValue names `thenRn` \ rns ->
- checkIEWith rn rns `thenRn` \ exps ->
- checkImportAll rn `thenRn_`
- returnRn (Nothing, exps)
+-- rnDecl does all the work
+rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
+
+rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
+ returnRn (ValD new_binds, fvs)
+
+
+rnDecl (SigD (IfaceSig name ty id_infos loc))
+ = pushSrcLocRn loc $
+ lookupTopBndrRn name `thenRn` \ name' ->
+ rnHsType doc_str ty `thenRn` \ (ty',fvs1) ->
+ mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) ->
+ returnRn (SigD (IfaceSig name' ty' id_infos' loc), fvs1 `plusFV` fvs2)
where
- checkIEWith rn@(RnData n cons fields) rns
- | same_names (cons++fields) rns
- = returnRn (unitBag (exp_all n), listToBag (map exp_all cons)
- `unionBags`
- listToBag (map exp_all fields))
- | otherwise
- = rnWithErr "constructors (and fields)" rn (cons++fields) rns
- checkIEWith rn@(RnClass n ops) rns
- | same_names ops rns
- = returnRn (unitBag (exp_all n), listToBag (map exp_all ops))
- | otherwise
- = rnWithErr "class ops" rn ops rns
- checkIEWith rn@(RnSyn _) rns
- = getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn (emptyBag, emptyBag) (synAllExportErr True{-error-} rn src_loc)
- checkIEWith (WiredInTyCon _) rns = panic "RnSource.rnIE:checkIEWith:WiredInTyCon:ToDo (boring)"
- checkIEWith rn rns
- = pprTrace "rnIE:IEWith:panic? ToDo?:" (ppr PprDebug rn) $
- returnRn (emptyBag, emptyBag)
-
- exp_all n = (n, ExportAll)
-
- same_names has rns
- = all (not.isRnUnbound) rns &&
- sortLt (<) (map uniqueOf has) == sortLt (<) (map uniqueOf rns)
-
- rnWithErr str rn has rns
- = getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn (emptyBag, emptyBag) (withExportErr str rn has rns src_loc)
-
-rnIE mods (IEModuleContents mod)
- | isIn "rnIE:IEModule" mod mods
- = returnRn (Just mod, (emptyBag, emptyBag))
- | otherwise
- = getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn (Nothing, (emptyBag, emptyBag)) (badModExportErr mod src_loc)
-
-
-checkImportAll rn
- = case nameImportFlag (getName rn) of
- ExportAll -> returnRn ()
- exp -> getSrcLocRn `thenRn` \ src_loc ->
- addErrRn (importAllErr rn src_loc)
+ doc_str = text "the interface signature for" <+> quotes (ppr name)
\end{code}
%*********************************************************
Renaming type variables is a pain. Because they now contain uniques,
it is necessary to pass in an association list which maps a parsed
-tyvar to its Name representation. In some cases (type signatures of
-values), it is even necessary to go over the type first in order to
-get the set of tyvars used by it, make an assoc list, and then go over
-it again to rename the tyvars! However, we can also do some scoping
-checks at the same time.
+tyvar to its @Name@ representation.
+In some cases (type signatures of values),
+it is even necessary to go over the type first
+in order to get the set of tyvars used by it, make an assoc list,
+and then go over it again to rename the tyvars!
+However, we can also do some scoping checks at the same time.
\begin{code}
-rnTyDecl :: RdrNameTyDecl -> RnM_Fixes s RenamedTyDecl
-
-rnTyDecl (TyData context tycon tyvars condecls derivings pragmas src_loc)
+rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls nconstrs derivings pragmas src_loc gen_name1 gen_name2))
= pushSrcLocRn src_loc $
- lookupTyCon tycon `thenRn` \ tycon' ->
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') ->
- rnContext tv_env src_loc context `thenRn` \ context' ->
- rnConDecls tv_env condecls `thenRn` \ condecls' ->
- rn_derivs tycon' src_loc derivings `thenRn` \ derivings' ->
+ lookupTopBndrRn tycon `thenRn` \ tycon' ->
+ bindTyVarsFVRn data_doc tyvars $ \ tyvars' ->
+ rnContext data_doc context `thenRn` \ (context', cxt_fvs) ->
+ checkDupOrQualNames data_doc con_names `thenRn_`
+ mapFvRn rnConDecl condecls `thenRn` \ (condecls', con_fvs) ->
+ lookupSysBinder gen_name1 `thenRn` \ name1' ->
+ lookupSysBinder gen_name2 `thenRn` \ name2' ->
+ rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) ->
ASSERT(isNoDataPragmas pragmas)
- returnRn (TyData context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc)
+ returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' nconstrs
+ derivings' noDataPragmas src_loc name1' name2'),
+ cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs)
+ where
+ data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
+ con_names = map conDeclName condecls
-rnTyDecl (TyNew context tycon tyvars condecl derivings pragmas src_loc)
+rnDecl (TyClD (TySynonym name tyvars ty src_loc))
= pushSrcLocRn src_loc $
- lookupTyCon tycon `thenRn` \ tycon' ->
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') ->
- rnContext tv_env src_loc context `thenRn` \ context' ->
- rnConDecls tv_env condecl `thenRn` \ condecl' ->
- rn_derivs tycon' src_loc derivings `thenRn` \ derivings' ->
- ASSERT(isNoDataPragmas pragmas)
- returnRn (TyNew context' tycon' tyvars' condecl' derivings' noDataPragmas src_loc)
+ doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
+ lookupTopBndrRn name `thenRn` \ name' ->
+ bindTyVarsFVRn syn_doc tyvars $ \ tyvars' ->
+ rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ (ty', ty_fvs) ->
+ returnRn (TyClD (TySynonym name' tyvars' ty' src_loc), ty_fvs)
+ where
+ syn_doc = text "the declaration for type synonym" <+> quotes (ppr name)
-rnTyDecl (TySynonym name tyvars ty src_loc)
+ -- For H98 we do *not* universally quantify on the RHS of a synonym
+ -- Silently discard context... but the tyvars in the rest won't be in scope
+ unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty
+ unquantify glaExys ty = ty
+
+rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas
+ names src_loc))
= pushSrcLocRn src_loc $
- lookupTyCon name `thenRn` \ name' ->
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') ->
- rnMonoType tv_env ty `thenRn` \ ty' ->
- returnRn (TySynonym name' tyvars' ty' src_loc)
-rn_derivs tycon2 locn Nothing -- derivs not specified
- = returnRn Nothing
+ lookupTopBndrRn cname `thenRn` \ cname' ->
-rn_derivs tycon2 locn (Just ds)
- = mapRn (rn_deriv tycon2 locn) ds `thenRn` \ derivs ->
- returnRn (Just derivs)
- where
- rn_deriv tycon2 locn clas
- = lookupClass clas `thenRn` \ clas_name ->
- addErrIfRn (uniqueOf clas_name `not_elem` derivableClassKeys)
- (derivingNonStdClassErr clas_name locn)
- `thenRn_`
- returnRn clas_name
- where
- not_elem = isn'tIn "rn_deriv"
-\end{code}
+ -- Deal with the implicit tycon and datacon name
+ -- They aren't in scope (because they aren't visible to the user)
+ -- and what we want to do is simply look them up in the cache;
+ -- we jolly well ought to get a 'hit' there!
+ -- So the 'Imported' part of this call is not relevant.
+ -- Unclean; but since these two are the only place this happens
+ -- I can't work up the energy to do it more beautifully
-@rnConDecls@ uses the `global name function' to create a new
-constructor in which local names have been replaced by their original
-names, reporting any unknown names.
+ mapRn lookupSysBinder names `thenRn` \ names' ->
-\begin{code}
-rnConDecls :: TyVarNamesEnv
- -> [RdrNameConDecl]
- -> RnM_Fixes s [RenamedConDecl]
+ -- Tyvars scope over bindings and context
+ bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' ->
+
+ -- Check the superclasses
+ rnContext cls_doc context `thenRn` \ (context', cxt_fvs) ->
+
+ -- Check the functional dependencies
+ rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) ->
+
+ -- Check the signatures
+ -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
+ let
+ (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
+ in
+ checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
+ mapFvRn (rn_op cname' clas_tyvar_names fds') op_sigs `thenRn` \ (sigs', sig_fvs) ->
+ let
+ binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
+ in
+ renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ (non_ops', fix_fvs) ->
+
+ -- Check the methods
+ -- The newLocals call is tiresome: given a generic class decl
+ -- class C a where
+ -- op :: a -> a
+ -- op {| x+y |} (Inl a) = ...
+ -- op {| x+y |} (Inr b) = ...
+ -- op {| a*b |} (a*b) = ...
+ -- we want to name both "x" tyvars with the same unique, so that they are
+ -- easy to group together in the typechecker.
+ -- Hence the
+ getLocalNameEnv `thenRn` \ name_env ->
+ let
+ meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
+ gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
+ not (tv `elemFM` name_env)]
+ in
+ checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
+ newLocalsRn mkLocalName gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars ->
+ rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
-rnConDecls tv_env con_decls
- = mapRn rn_decl con_decls
+ -- Typechecker is responsible for checking that we only
+ -- give default-method bindings for things in this class.
+ -- The renamer *could* check this for class decls, but can't
+ -- for instance decls.
+
+ ASSERT(isNoClassPragmas pragmas)
+ returnRn (TyClD (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') mbinds'
+ NoClassPragmas names' src_loc),
+ sig_fvs `plusFV`
+
+ fix_fvs `plusFV`
+ cxt_fvs `plusFV`
+ fds_fvs `plusFV`
+ meth_fvs
+ )
+ )
where
- rn_decl (ConDecl name tys src_loc)
- = pushSrcLocRn src_loc $
- lookupConstr name `thenRn` \ new_name ->
- mapRn rn_bang_ty tys `thenRn` \ new_tys ->
- returnRn (ConDecl new_name new_tys src_loc)
-
- rn_decl (ConOpDecl ty1 op ty2 src_loc)
- = pushSrcLocRn src_loc $
- lookupConstr op `thenRn` \ new_op ->
- rn_bang_ty ty1 `thenRn` \ new_ty1 ->
- rn_bang_ty ty2 `thenRn` \ new_ty2 ->
- returnRn (ConOpDecl new_ty1 new_op new_ty2 src_loc)
-
- rn_decl (NewConDecl name ty src_loc)
- = pushSrcLocRn src_loc $
- lookupConstr name `thenRn` \ new_name ->
- rn_mono_ty ty `thenRn` \ new_ty ->
- returnRn (NewConDecl new_name new_ty src_loc)
-
- rn_decl (RecConDecl name fields src_loc)
- = pushSrcLocRn src_loc $
- lookupConstr name `thenRn` \ new_name ->
- mapRn rn_field fields `thenRn` \ new_fields ->
- returnRn (RecConDecl new_name new_fields src_loc)
-
- rn_field (names, ty)
- = mapRn lookupField names `thenRn` \ new_names ->
- rn_bang_ty ty `thenRn` \ new_ty ->
- returnRn (new_names, new_ty)
-
- rn_mono_ty = rnMonoType tv_env
- rn_poly_ty = rnPolyType tv_env
-
- rn_bang_ty (Banged ty)
- = rn_poly_ty ty `thenRn` \ new_ty ->
- returnRn (Banged new_ty)
- rn_bang_ty (Unbanged ty)
- = rn_poly_ty ty `thenRn` \ new_ty ->
- returnRn (Unbanged new_ty)
+ cls_doc = text "the declaration for class" <+> ppr cname
+ sig_doc = text "the signatures for class" <+> ppr cname
+ meth_doc = text "the default-methods for class" <+> ppr cname
+
+ rn_op clas clas_tyvars clas_fds sig@(ClassOpSig op maybe_dm_stuff ty locn)
+ = pushSrcLocRn locn $
+ lookupTopBndrRn op `thenRn` \ op_name ->
+
+ -- Check the signature
+ rnHsSigType (quotes (ppr op)) ty `thenRn` \ (new_ty, op_ty_fvs) ->
+ let
+ check_in_op_ty clas_tyvar =
+ checkRn (clas_tyvar `elemNameSet` oclose clas_fds op_ty_fvs)
+ (classTyVarNotInOpTyErr clas_tyvar sig)
+ in
+ mapRn_ check_in_op_ty clas_tyvars `thenRn_`
+
+ -- Make the default-method name
+ (case maybe_dm_stuff of
+ Nothing -> returnRn (Nothing, emptyFVs) -- Source-file class decl
+
+ Just (DefMeth dm_rdr_name)
+ -> -- Imported class that has a default method decl
+ -- See comments with tname, snames, above
+ lookupSysBinder dm_rdr_name `thenRn` \ dm_name ->
+ returnRn (Just (DefMeth dm_name), unitFV dm_name)
+ -- An imported class decl for a class decl that had an explicit default
+ -- method, mentions, rather than defines,
+ -- the default method, so we must arrange to pull it in
+ Just GenDefMeth
+ -> returnRn (Just GenDefMeth, emptyFVs)
+ Just NoDefMeth
+ -> returnRn (Just NoDefMeth, emptyFVs)
+ ) `thenRn` \ (maybe_dm_stuff', dm_fvs) ->
+
+ returnRn (ClassOpSig op_name maybe_dm_stuff' new_ty locn, op_ty_fvs `plusFV` dm_fvs)
\end{code}
+
%*********************************************************
-%* *
-\subsection{SPECIALIZE data pragmas}
-%* *
+%* *
+\subsection{Instance declarations}
+%* *
%*********************************************************
\begin{code}
-rnSpecDataSig :: RdrNameSpecDataSig
- -> RnM_Fixes s RenamedSpecDataSig
-
-rnSpecDataSig (SpecDataSig tycon ty src_loc)
+rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc))
= pushSrcLocRn src_loc $
+ rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
let
- tyvars = extractMonoTyNames is_tyvar_name ty
+ inst_tyvars = case inst_ty' of
+ HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars
+ other -> []
+ -- (Slightly strangely) the forall-d tyvars scope over
+ -- the method bindings too
in
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) ->
- lookupTyCon tycon `thenRn` \ tycon' ->
- rnMonoType tv_env ty `thenRn` \ ty' ->
- returnRn (SpecDataSig tycon' ty' src_loc)
-is_tyvar_name n = isLexVarId (getLocalName n)
+ -- Rename the bindings
+ -- NB meth_names can be qualified!
+ checkDupNames meth_doc meth_names `thenRn_`
+ extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) (
+ rnMethodBinds [] mbinds
+ ) `thenRn` \ (mbinds', meth_fvs) ->
+ let
+ binders = collectMonoBinders mbinds'
+ binder_set = mkNameSet binders
+ in
+ -- Rename the prags and signatures.
+ -- Note that the type variables are not in scope here,
+ -- so that instance Eq a => Eq (T a) where
+ -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
+ -- works OK.
+ --
+ -- But the (unqualified) method names are in scope
+ bindLocalNames binders (
+ renameSigs (okInstDclSig binder_set) uprags
+ ) `thenRn` \ (new_uprags, prag_fvs) ->
+
+ (case maybe_dfun_rdr_name of
+ Nothing -> returnRn (Nothing, emptyFVs)
+
+ Just dfun_rdr_name -> lookupSysBinder dfun_rdr_name `thenRn` \ dfun_name ->
+ returnRn (Just dfun_name, unitFV dfun_name)
+ ) `thenRn` \ (maybe_dfun_name, dfun_fv) ->
+
+ -- The typechecker checks that all the bindings are for the right class.
+ returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags maybe_dfun_name src_loc),
+ inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv)
+ where
+ meth_doc = text "the bindings in an instance declaration"
+ meth_names = collectLocatedMonoBinders mbinds
\end{code}
%*********************************************************
%* *
-\subsection{Class declarations}
+\subsection{Default declarations}
%* *
%*********************************************************
-@rnClassDecl@ uses the `global name function' to create a new
-class declaration in which local names have been replaced by their
-original names, reporting any unknown names.
-
\begin{code}
-rnClassDecl :: RdrNameClassDecl -> RnM_Fixes s RenamedClassDecl
-
-rnClassDecl (ClassDecl context cname tyvar sigs mbinds pragmas src_loc)
+rnDecl (DefD (DefaultDecl tys src_loc))
= pushSrcLocRn src_loc $
- mkTyVarNamesEnv src_loc [tyvar] `thenRn` \ (tv_env, [tyvar']) ->
- rnContext tv_env src_loc context `thenRn` \ context' ->
- lookupClass cname `thenRn` \ cname' ->
- mapRn (rn_op cname' tyvar' tv_env) sigs `thenRn` \ sigs' ->
- rnMethodBinds cname' mbinds `thenRn` \ mbinds' ->
- ASSERT(isNoClassPragmas pragmas)
- returnRn (ClassDecl context' cname' tyvar' sigs' mbinds' NoClassPragmas src_loc)
+ rnHsTypes doc_str tys `thenRn` \ (tys', fvs) ->
+ returnRn (DefD (DefaultDecl tys' src_loc), fvs)
where
- rn_op clas clas_tyvar tv_env sig@(ClassOpSig op ty pragmas locn)
- = pushSrcLocRn locn $
- lookupClassOp clas op `thenRn` \ op_name ->
- rnPolyType tv_env ty `thenRn` \ new_ty ->
- let
- (HsForAllTy tvs ctxt op_ty) = new_ty
- ctxt_tvs = extractCtxtTyNames ctxt
- op_tvs = extractMonoTyNames is_tyvar_name op_ty
- in
- -- check that class tyvar appears in op_ty
- ( if isIn "rn_op" clas_tyvar op_tvs
- then returnRn ()
- else addErrRn (classTyVarNotInOpTyErr clas_tyvar sig locn)
- ) `thenRn_`
-
- -- check that class tyvar *doesn't* appear in the sig's context
- ( if isIn "rn_op(2)" clas_tyvar ctxt_tvs
- then addErrRn (classTyVarInOpCtxtErr clas_tyvar sig locn)
- else returnRn ()
- ) `thenRn_`
-
- ASSERT(isNoClassOpPragmas pragmas)
- returnRn (ClassOpSig op_name new_ty noClassOpPragmas locn)
+ doc_str = text "a `default' declaration"
\end{code}
-
%*********************************************************
%* *
-\subsection{Instance declarations}
+\subsection{Foreign declarations}
%* *
%*********************************************************
-
-@rnInstDecl@ uses the `global name function' to create a new of
-instance declaration in which local names have been replaced by their
-original names, reporting any unknown names.
-
\begin{code}
-rnInstDecl :: RdrNameInstDecl -> RnM_Fixes s RenamedInstDecl
-
-rnInstDecl (InstDecl cname ty mbinds from_here modname uprags pragmas src_loc)
+rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
= pushSrcLocRn src_loc $
- lookupClass cname `thenRn` \ cname' ->
-
- rnPolyType [] ty `thenRn` \ ty' ->
- -- [] tv_env ensures that tyvars will be foralled
+ lookupOccRn name `thenRn` \ name' ->
+ let
+ extra_fvs FoExport
+ | isDyn = lookupOrigNames [makeStablePtr_RDR, deRefStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR]
+ | otherwise =
+ lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs ->
+ returnRn (addOneFV fvs name')
+ extra_fvs other = returnRn emptyFVs
+ in
+ checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_`
- rnMethodBinds cname' mbinds `thenRn` \ mbinds' ->
- mapRn (rn_uprag cname') uprags `thenRn` \ new_uprags ->
+ extra_fvs imp_exp `thenRn` \ fvs1 ->
- ASSERT(isNoInstancePragmas pragmas)
- returnRn (InstDecl cname' ty' mbinds'
- from_here modname new_uprags noInstancePragmas src_loc)
- where
- rn_uprag class_name (SpecSig op ty using locn)
- = pushSrcLocRn src_loc $
- lookupClassOp class_name op `thenRn` \ op_name ->
- rnPolyType nullTyVarNamesEnv ty `thenRn` \ new_ty ->
- rn_using using `thenRn` \ new_using ->
- returnRn (SpecSig op_name new_ty new_using locn)
-
- rn_uprag class_name (InlineSig op locn)
- = pushSrcLocRn locn $
- lookupClassOp class_name op `thenRn` \ op_name ->
- returnRn (InlineSig op_name locn)
+ rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs2) ->
+ returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc),
+ fvs1 `plusFV` fvs2)
+ where
+ fo_decl_msg = ptext SLIT("a foreign declaration")
+ isDyn = isDynamicExtName ext_nm
- rn_uprag class_name (DeforestSig op locn)
- = pushSrcLocRn locn $
- lookupClassOp class_name op `thenRn` \ op_name ->
- returnRn (DeforestSig op_name locn)
-
- rn_uprag class_name (MagicUnfoldingSig op str locn)
- = pushSrcLocRn locn $
- lookupClassOp class_name op `thenRn` \ op_name ->
- returnRn (MagicUnfoldingSig op_name str locn)
-
- rn_using Nothing
- = returnRn Nothing
- rn_using (Just v)
- = lookupValue v `thenRn` \ new_v ->
- returnRn (Just new_v)
+ ok_ext_nm Dynamic = True
+ ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb
+ ok_ext_nm (ExtName nm Nothing) = isCLabelString nm
\end{code}
%*********************************************************
%* *
-\subsection{@SPECIALIZE instance@ user-pragmas}
+\subsection{Rules}
%* *
%*********************************************************
\begin{code}
-rnSpecInstSig :: RdrNameSpecInstSig
- -> RnM_Fixes s RenamedSpecInstSig
-
-rnSpecInstSig (SpecInstSig clas ty src_loc)
- = pushSrcLocRn src_loc $
+rnDecl (RuleD (IfaceRule rule_name vars fn args rhs src_loc))
+ = pushSrcLocRn src_loc $
+ lookupOccRn fn `thenRn` \ fn' ->
+ rnCoreBndrs vars $ \ vars' ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn (RuleD (IfaceRule rule_name vars' fn' args' rhs' src_loc),
+ (fvs1 `plusFV` fvs2) `addOneFV` fn')
+
+rnDecl (RuleD (IfaceRuleOut fn rule))
+ -- This one is used for BuiltInRules
+ -- The rule itself is already done, but the thing
+ -- to attach it to is not.
+ = lookupOccRn fn `thenRn` \ fn' ->
+ returnRn (RuleD (IfaceRuleOut fn' rule), unitFV fn')
+
+rnDecl (RuleD (HsRule rule_name tvs vars lhs rhs src_loc))
+ = ASSERT( null tvs )
+ pushSrcLocRn src_loc $
+
+ bindTyVarsFV2Rn doc (map UserTyVar sig_tvs) $ \ sig_tvs' _ ->
+ bindLocalsFVRn doc (map get_var vars) $ \ ids ->
+ mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) ->
+
+ rnExpr lhs `thenRn` \ (lhs', fv_lhs) ->
+ rnExpr rhs `thenRn` \ (rhs', fv_rhs) ->
+ checkRn (validRuleLhs ids lhs')
+ (badRuleLhsErr rule_name lhs') `thenRn_`
let
- tyvars = extractMonoTyNames is_tyvar_name ty
+ bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
in
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) ->
- lookupClass clas `thenRn` \ new_clas ->
- rnMonoType tv_env ty `thenRn` \ new_ty ->
- returnRn (SpecInstSig new_clas new_ty src_loc)
+ mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
+ returnRn (RuleD (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc),
+ fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
+ where
+ doc = text "the transformation rule" <+> ptext rule_name
+ sig_tvs = extractRuleBndrsTyVars vars
+
+ get_var (RuleBndr v) = v
+ get_var (RuleBndrSig v _) = v
+
+ rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
+ rn_var (RuleBndrSig v t, id) = rnHsType doc t `thenRn` \ (t', fvs) ->
+ returnRn (RuleBndrSig id t', fvs)
\end{code}
+
%*********************************************************
%* *
-\subsection{Default declarations}
+\subsection{Support code for type/data declarations}
%* *
%*********************************************************
-@rnDefaultDecl@ uses the `global name function' to create a new set
-of default declarations in which local names have been replaced by
-their original names, reporting any unknown names.
-
\begin{code}
-rnDefaultDecl :: [RdrNameDefaultDecl] -> RnM_Fixes s [RenamedDefaultDecl]
+rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name], FreeVars)
-rnDefaultDecl [] = returnRn []
-rnDefaultDecl [DefaultDecl tys src_loc]
- = pushSrcLocRn src_loc $
- mapRn (rnMonoType nullTyVarNamesEnv) tys `thenRn` \ tys' ->
- returnRn [DefaultDecl tys' src_loc]
-rnDefaultDecl defs@(d:ds)
- = addErrRn (dupDefaultDeclErr defs) `thenRn_`
- rnDefaultDecl [d]
-\end{code}
+rnDerivs Nothing -- derivs not specified
+ = returnRn (Nothing, emptyFVs)
-%*************************************************************************
-%* *
-\subsection{Fixity declarations}
-%* *
-%*************************************************************************
+rnDerivs (Just clss)
+ = mapRn do_one clss `thenRn` \ clss' ->
+ returnRn (Just clss', mkNameSet clss')
+ where
+ do_one cls = lookupOccRn cls `thenRn` \ clas_name ->
+ checkRn (getUnique clas_name `elem` derivableClassKeys)
+ (derivingNonStdClassErr clas_name) `thenRn_`
+ returnRn clas_name
+\end{code}
\begin{code}
-rnFixes :: [RdrNameFixityDecl] -> RnM s [RenamedFixityDecl]
+conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
+conDeclName (ConDecl n _ _ _ _ l) = (n,l)
+
+rnConDecl :: RdrNameConDecl -> RnMS (RenamedConDecl, FreeVars)
+rnConDecl (ConDecl name wkr tvs cxt details locn)
+ = pushSrcLocRn locn $
+ checkConName name `thenRn_`
+ lookupTopBndrRn name `thenRn` \ new_name ->
+
+ lookupSysBinder wkr `thenRn` \ new_wkr ->
+ -- See comments with ClassDecl
+
+ bindTyVarsFVRn doc tvs $ \ new_tyvars ->
+ rnContext doc cxt `thenRn` \ (new_context, cxt_fvs) ->
+ rnConDetails doc locn details `thenRn` \ (new_details, det_fvs) ->
+ returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn,
+ cxt_fvs `plusFV` det_fvs)
+ where
+ doc = text "the definition of data constructor" <+> quotes (ppr name)
-rnFixes fixities
- = getSrcLocRn `thenRn` \ src_loc ->
- let
- (_, dup_fixes) = removeDups cmp_fix fixities
- cmp_fix fix1 fix2 = fixDeclName fix1 `cmp` fixDeclName fix2
-
- rn_fixity fix@(InfixL name i)
- = rn_fixity_pieces InfixL name i fix
- rn_fixity fix@(InfixR name i)
- = rn_fixity_pieces InfixR name i fix
- rn_fixity fix@(InfixN name i)
- = rn_fixity_pieces InfixN name i fix
-
- rn_fixity_pieces mk_fixity name i fix
- = getRnEnv `thenRn` \ env ->
- case lookupGlobalRnEnv env name of
- Just res | isLocallyDefined res || opt_CompilingGhcInternals
- -- the opt_CompilingGhcInternals thing is a *HACK* to get (:)'s
- -- fixity decl to go through. It has a builtin name, which
- -- doesn't respond to isLocallyDefined... sigh.
- -> returnRn (Just (mk_fixity res i))
- _ -> failButContinueRn Nothing (undefinedFixityDeclErr src_loc fix)
- in
- mapRn (addErrRn . dupFixityDeclErr src_loc) dup_fixes `thenRn_`
- mapRn rn_fixity fixities `thenRn` \ fixes_maybe ->
- returnRn (catMaybes fixes_maybe)
+rnConDetails doc locn (VanillaCon tys)
+ = mapFvRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs) ->
+ returnRn (VanillaCon new_tys, fvs)
+
+rnConDetails doc locn (InfixCon ty1 ty2)
+ = rnBangTy doc ty1 `thenRn` \ (new_ty1, fvs1) ->
+ rnBangTy doc ty2 `thenRn` \ (new_ty2, fvs2) ->
+ returnRn (InfixCon new_ty1 new_ty2, fvs1 `plusFV` fvs2)
+
+rnConDetails doc locn (RecCon fields)
+ = checkDupOrQualNames doc field_names `thenRn_`
+ mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) ->
+ returnRn (RecCon new_fields, fvs)
+ where
+ field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
+
+rnField doc (names, ty)
+ = mapRn lookupTopBndrRn names `thenRn` \ new_names ->
+ rnBangTy doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn ((new_names, new_ty), fvs)
+
+rnBangTy doc (Banged ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Banged new_ty, fvs)
+
+rnBangTy doc (Unbanged ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Unbanged new_ty, fvs)
+
+rnBangTy doc (Unpacked ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Unpacked new_ty, fvs)
+
+-- This data decl will parse OK
+-- data T = a Int
+-- treating "a" as the constructor.
+-- It is really hard to make the parser spot this malformation.
+-- So the renamer has to check that the constructor is legal
+--
+-- We can get an operator as the constructor, even in the prefix form:
+-- data T = :% Int Int
+-- from interface files, which always print in prefix form
+
+checkConName name
+ = checkRn (isRdrDataCon name)
+ (badDataCon name)
\end{code}
+
%*********************************************************
%* *
\subsection{Support code to rename types}
%*********************************************************
\begin{code}
-rnPolyType :: TyVarNamesEnv
- -> RdrNamePolyType
- -> RnM_Fixes s RenamedPolyType
+rnHsSigType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
+ -- rnHsSigType is used for source-language type signatures,
+ -- which use *implicit* universal quantification.
+rnHsSigType doc_str ty
+ = rnHsType (text "the type signature for" <+> doc_str) ty
+
+---------------------------------------
+rnHsType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
+
+rnHsType doc (HsForAllTy Nothing ctxt ty)
+ -- Implicit quantifiction in source code (no kinds on tyvars)
+ -- Given the signature C => T we universally quantify
+ -- over FV(T) \ {in-scope-tyvars}
+ = getLocalNameEnv `thenRn` \ name_env ->
+ let
+ mentioned_in_tau = extractHsTyRdrTyVars ty
+ mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
+ mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
+ forall_tyvars = filter (not . (`elemFM` name_env)) mentioned
+ in
+ rnForAll doc (map UserTyVar forall_tyvars) ctxt ty
-rnPolyType tv_env (HsForAllTy tvs ctxt ty)
- = rn_poly_help tv_env tvs ctxt ty
+rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau)
+ -- Explicit quantification.
+ -- Check that the forall'd tyvars are actually
+ -- mentioned in the type, and produce a warning if not
+ = let
+ mentioned_in_tau = extractHsTyRdrTyVars tau
+ mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
+ mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
+ forall_tyvar_names = hsTyVarNames forall_tyvars
-rnPolyType tv_env (HsPreForAllTy ctxt ty)
- = rn_poly_help tv_env forall_tyvars ctxt ty
+ -- Explicitly quantified but not mentioned in ctxt or tau
+ warn_guys = filter (`notElem` mentioned) forall_tyvar_names
+ in
+ mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
+ rnForAll doc forall_tyvars ctxt tau
+
+rnHsType doc (HsTyVar tyvar)
+ = lookupOccRn tyvar `thenRn` \ tyvar' ->
+ returnRn (HsTyVar tyvar', unitFV tyvar')
+
+rnHsType doc (HsOpTy ty1 opname ty2)
+ = lookupOccRn opname `thenRn` \ name' ->
+ rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2',fvs2) ->
+ returnRn (HsOpTy ty1' name' ty2', fvs1 `plusFV` fvs2 `addOneFV` name')
+
+rnHsType doc (HsNumTy i)
+ | i == 1 = returnRn (HsNumTy i, emptyFVs)
+ | otherwise = failWithRn (HsNumTy i, emptyFVs)
+ (ptext SLIT("Only unit numeric type pattern is valid"))
+
+rnHsType doc (HsFunTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ -- Might find a for-all as the arg of a function type
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ -- Or as the result. This happens when reading Prelude.hi
+ -- when we find return :: forall m. Monad m -> forall a. a -> m a
+ returnRn (HsFunTy ty1' ty2', fvs1 `plusFV` fvs2)
+
+rnHsType doc (HsListTy ty)
+ = rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsListTy ty', fvs `addOneFV` listTyCon_name)
+
+-- Unboxed tuples are allowed to have poly-typed arguments. These
+-- sometimes crop up as a result of CPR worker-wrappering dictionaries.
+rnHsType doc (HsTupleTy (HsTupCon _ boxity) tys)
+ -- Don't do lookupOccRn, because this is built-in syntax
+ -- so it doesn't need to be in scope
+ = mapFvRn (rnHsType doc) tys `thenRn` \ (tys', fvs) ->
+ returnRn (HsTupleTy (HsTupCon n' boxity) tys', fvs `addOneFV` n')
where
- mentioned_tyvars = extractCtxtTyNames ctxt `unionLists` extractMonoTyNames is_tyvar_name ty
- forall_tyvars = {-
- pprTrace "mentioned:" (ppCat (map (ppr PprShowAll) mentioned_tyvars)) $
- pprTrace "from_ty:" (ppCat (map (ppr PprShowAll) (extractMonoTyNames is_tyvar_name ty))) $
- -}
- mentioned_tyvars `minusList` domTyVarNamesEnv tv_env
-
-------------
-rn_poly_help :: TyVarNamesEnv
- -> [RdrName]
- -> RdrNameContext
- -> RdrNameMonoType
- -> RnM_Fixes s RenamedPolyType
-
-rn_poly_help tv_env tyvars ctxt ty
- = {-
- pprTrace "rnPolyType:"
- (ppCat [ppCat (map (ppr PprShowAll . snd) tv_env),
- ppStr ";tvs=", ppCat (map (ppr PprShowAll) tyvars),
- ppStr ";ctxt=", ppCat (map (ppr PprShowAll) ctxt),
- ppStr ";ty=", ppr PprShowAll ty]) $
- -}
- getSrcLocRn `thenRn` \ src_loc ->
- mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env1, new_tyvars) ->
+ n' = tupleTyCon_name boxity (length tys)
+
+
+rnHsType doc (HsAppTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ returnRn (HsAppTy ty1' ty2', fvs1 `plusFV` fvs2)
+
+rnHsType doc (HsPredTy pred)
+ = rnPred doc pred `thenRn` \ (pred', fvs) ->
+ returnRn (HsPredTy pred', fvs)
+
+rnHsType doc (HsUsgForAllTy uv_rdr ty)
+ = bindUVarRn doc uv_rdr $ \ uv_name ->
+ rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsUsgForAllTy uv_name ty',
+ fvs )
+
+rnHsType doc (HsUsgTy usg ty)
+ = newUsg usg `thenRn` \ (usg', usg_fvs) ->
+ rnHsType doc ty `thenRn` \ (ty', ty_fvs) ->
+ -- A for-all can occur inside a usage annotation
+ returnRn (HsUsgTy usg' ty',
+ usg_fvs `plusFV` ty_fvs)
+ where
+ newUsg usg = case usg of
+ HsUsOnce -> returnRn (HsUsOnce, emptyFVs)
+ HsUsMany -> returnRn (HsUsMany, emptyFVs)
+ HsUsVar uv_rdr -> lookupOccRn uv_rdr `thenRn` \ uv_name ->
+ returnRn (HsUsVar uv_name, emptyFVs)
+
+rnHsTypes doc tys = mapFvRn (rnHsType doc) tys
+\end{code}
+
+\begin{code}
+-- We use lookupOcc here because this is interface file only stuff
+-- and we need the workers...
+rnHsTupCon (HsTupCon n boxity)
+ = lookupOccRn n `thenRn` \ n' ->
+ returnRn (HsTupCon n' boxity, unitFV n')
+
+rnHsTupConWkr (HsTupCon n boxity)
+ -- Tuple construtors are for the *worker* of the tuple
+ -- Going direct saves needless messing about
+ = lookupOccRn (mkRdrNameWkr n) `thenRn` \ n' ->
+ returnRn (HsTupCon n' boxity, unitFV n')
+\end{code}
+
+\begin{code}
+rnForAll doc forall_tyvars ctxt ty
+ = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars ->
+ rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) ->
+ rnHsType doc ty `thenRn` \ (new_ty, ty_fvs) ->
+ returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty,
+ cxt_fvs `plusFV` ty_fvs)
+\end{code}
+
+\begin{code}
+rnContext :: SDoc -> RdrNameContext -> RnMS (RenamedContext, FreeVars)
+rnContext doc ctxt
+ = mapAndUnzipRn rn_pred ctxt `thenRn` \ (theta, fvs_s) ->
let
- tv_env2 = catTyVarNamesEnvs tv_env1 tv_env
+ (_, dups) = removeDupsEq theta
+ -- We only have equality, not ordering
in
- rnContext tv_env2 src_loc ctxt `thenRn` \ new_ctxt ->
- rnMonoType tv_env2 ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
+ -- Check for duplicate assertions
+ -- If this isn't an error, then it ought to be:
+ mapRn (addWarnRn . dupClassAssertWarn theta) dups `thenRn_`
+ returnRn (theta, plusFVs fvs_s)
+ where
+ --Someone discovered that @CCallable@ and @CReturnable@
+ -- could be used in contexts such as:
+ -- foo :: CCallable a => a -> PrimIO Int
+ -- Doing this utterly wrecks the whole point of introducing these
+ -- classes so we specifically check that this isn't being done.
+ rn_pred pred = rnPred doc pred `thenRn` \ (pred', fvs)->
+ checkRn (not (bad_pred pred'))
+ (naughtyCCallContextErr pred') `thenRn_`
+ returnRn (pred', fvs)
+
+ bad_pred (HsPClass clas _) = getUnique clas `elem` cCallishClassKeys
+ bad_pred other = False
+
+
+rnPred doc (HsPClass clas tys)
+ = lookupOccRn clas `thenRn` \ clas_name ->
+ rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
+ returnRn (HsPClass clas_name tys', fvs `addOneFV` clas_name)
+
+rnPred doc (HsPIParam n ty)
+ = newIPName n `thenRn` \ name ->
+ rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsPIParam name ty', fvs)
\end{code}
\begin{code}
-rnMonoType :: TyVarNamesEnv
- -> RdrNameMonoType
- -> RnM_Fixes s RenamedMonoType
+rnFds :: SDoc -> [FunDep RdrName] -> RnMS ([FunDep Name], FreeVars)
-rnMonoType tv_env (MonoTyVar tyvar)
- = lookupTyVarName tv_env tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar')
+rnFds doc fds
+ = mapAndUnzipRn rn_fds fds `thenRn` \ (theta, fvs_s) ->
+ returnRn (theta, plusFVs fvs_s)
+ where
+ rn_fds (tys1, tys2)
+ = rnHsTyVars doc tys1 `thenRn` \ (tys1', fvs1) ->
+ rnHsTyVars doc tys2 `thenRn` \ (tys2', fvs2) ->
+ returnRn ((tys1', tys2'), fvs1 `plusFV` fvs2)
+
+rnHsTyVars doc tvs = mapFvRn (rnHsTyvar doc) tvs
+rnHsTyvar doc tyvar
+ = lookupOccRn tyvar `thenRn` \ tyvar' ->
+ returnRn (tyvar', unitFV tyvar')
+\end{code}
-rnMonoType tv_env (MonoListTy ty)
- = rnMonoType tv_env ty `thenRn` \ ty' ->
- returnRn (MonoListTy ty')
+%*********************************************************
+%* *
+\subsection{IdInfo}
+%* *
+%*********************************************************
+
+\begin{code}
+rnIdInfo (HsStrictness str) = returnRn (HsStrictness str, emptyFVs)
-rnMonoType tv_env (MonoFunTy ty1 ty2)
- = andRn MonoFunTy (rnMonoType tv_env ty1)
- (rnMonoType tv_env ty2)
+rnIdInfo (HsWorker worker)
+ = lookupOccRn worker `thenRn` \ worker' ->
+ returnRn (HsWorker worker', unitFV worker')
-rnMonoType tv_env (MonoTupleTy tys)
- = mapRn (rnMonoType tv_env) tys `thenRn` \ tys' ->
- returnRn (MonoTupleTy tys')
+rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ (expr', fvs) ->
+ returnRn (HsUnfold inline expr', fvs)
+rnIdInfo (HsArity arity) = returnRn (HsArity arity, emptyFVs)
+rnIdInfo HsNoCafRefs = returnRn (HsNoCafRefs, emptyFVs)
+rnIdInfo HsCprInfo = returnRn (HsCprInfo, emptyFVs)
-rnMonoType tv_env (MonoTyApp name tys)
- = let
- lookup_fn = if isLexVarId (getLocalName name)
- then lookupTyVarName tv_env
- else lookupTyCon
- in
- lookup_fn name `thenRn` \ name' ->
- mapRn (rnMonoType tv_env) tys `thenRn` \ tys' ->
- returnRn (MonoTyApp name' tys')
\end{code}
+@UfCore@ expressions.
+
\begin{code}
-rnContext :: TyVarNamesEnv -> SrcLoc -> RdrNameContext -> RnM_Fixes s RenamedContext
+rnCoreExpr (UfType ty)
+ = rnHsType (text "unfolding type") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfType ty', fvs)
+
+rnCoreExpr (UfVar v)
+ = lookupOccRn v `thenRn` \ v' ->
+ returnRn (UfVar v', unitFV v')
+
+rnCoreExpr (UfLit l)
+ = returnRn (UfLit l, emptyFVs)
+
+rnCoreExpr (UfLitLit l ty)
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfLitLit l ty', fvs)
+
+rnCoreExpr (UfCCall cc ty)
+ = rnHsType (text "ccall") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfCCall cc ty', fvs)
+
+rnCoreExpr (UfTuple con args)
+ = rnHsTupConWkr con `thenRn` \ (con', fvs1) ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs2) ->
+ returnRn (UfTuple con' args', fvs1 `plusFV` fvs2)
+
+rnCoreExpr (UfApp fun arg)
+ = rnCoreExpr fun `thenRn` \ (fun', fv1) ->
+ rnCoreExpr arg `thenRn` \ (arg', fv2) ->
+ returnRn (UfApp fun' arg', fv1 `plusFV` fv2)
+
+rnCoreExpr (UfCase scrut bndr alts)
+ = rnCoreExpr scrut `thenRn` \ (scrut', fvs1) ->
+ bindCoreLocalFVRn bndr ( \ bndr' ->
+ mapFvRn rnCoreAlt alts `thenRn` \ (alts', fvs2) ->
+ returnRn (UfCase scrut' bndr' alts', fvs2)
+ ) `thenRn` \ (case', fvs3) ->
+ returnRn (case', fvs1 `plusFV` fvs3)
+
+rnCoreExpr (UfNote note expr)
+ = rnNote note `thenRn` \ (note', fvs1) ->
+ rnCoreExpr expr `thenRn` \ (expr', fvs2) ->
+ returnRn (UfNote note' expr', fvs1 `plusFV` fvs2)
+
+rnCoreExpr (UfLam bndr body)
+ = rnCoreBndr bndr $ \ bndr' ->
+ rnCoreExpr body `thenRn` \ (body', fvs) ->
+ returnRn (UfLam bndr' body', fvs)
+
+rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
+ = rnCoreExpr rhs `thenRn` \ (rhs', fvs1) ->
+ rnCoreBndr bndr ( \ bndr' ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfNonRec bndr' rhs') body', fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
+
+rnCoreExpr (UfLet (UfRec pairs) body)
+ = rnCoreBndrs bndrs $ \ bndrs' ->
+ mapFvRn rnCoreExpr rhss `thenRn` \ (rhss', fvs1) ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body', fvs1 `plusFV` fvs2)
+ where
+ (bndrs, rhss) = unzip pairs
+\end{code}
-rnContext tv_env locn ctxt
- = mapRn rn_ctxt ctxt `thenRn` \ result ->
- let
- (_, dup_asserts) = removeDups cmp_assert result
- in
- -- If this isn't an error, then it ought to be:
- mapRn (addWarnRn . dupClassAssertWarn result locn) dup_asserts `thenRn_`
- returnRn result
+\begin{code}
+rnCoreBndr (UfValBinder name ty) thing_inside
+ = rnHsType doc ty `thenRn` \ (ty', fvs1) ->
+ bindCoreLocalFVRn name ( \ name' ->
+ thing_inside (UfValBinder name' ty')
+ ) `thenRn` \ (result, fvs2) ->
+ returnRn (result, fvs1 `plusFV` fvs2)
where
- rn_ctxt (clas, tyvar)
- = lookupClass clas `thenRn` \ clas_name ->
- lookupTyVarName tv_env tyvar `thenRn` \ tyvar_name ->
- returnRn (clas_name, tyvar_name)
+ doc = text "unfolding id"
+
+rnCoreBndr (UfTyBinder name kind) thing_inside
+ = bindCoreLocalFVRn name $ \ name' ->
+ thing_inside (UfTyBinder name' kind)
+
+rnCoreBndrs [] thing_inside = thing_inside []
+rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' ->
+ rnCoreBndrs bs $ \ names' ->
+ thing_inside (name':names')
+\end{code}
+
+\begin{code}
+rnCoreAlt (con, bndrs, rhs)
+ = rnUfCon con bndrs `thenRn` \ (con', fvs1) ->
+ bindCoreLocalsFVRn bndrs ( \ bndrs' ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn ((con', bndrs', rhs'), fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
+
+rnNote (UfCoerce ty)
+ = rnHsType (text "unfolding coerce") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfCoerce ty', fvs)
+
+rnNote (UfSCC cc) = returnRn (UfSCC cc, emptyFVs)
+rnNote UfInlineCall = returnRn (UfInlineCall, emptyFVs)
+rnNote UfInlineMe = returnRn (UfInlineMe, emptyFVs)
+
- cmp_assert (c1,tv1) (c2,tv2)
- = (c1 `cmp` c2) `thenCmp` (tv1 `cmp` tv2)
+rnUfCon UfDefault _
+ = returnRn (UfDefault, emptyFVs)
+
+rnUfCon (UfTupleAlt tup_con) bndrs
+ = rnHsTupCon tup_con `thenRn` \ (HsTupCon con' _, fvs) ->
+ returnRn (UfDataAlt con', fvs)
+ -- Makes the type checker a little easier
+
+rnUfCon (UfDataAlt con) _
+ = lookupOccRn con `thenRn` \ con' ->
+ returnRn (UfDataAlt con', unitFV con')
+
+rnUfCon (UfLitAlt lit) _
+ = returnRn (UfLitAlt lit, emptyFVs)
+
+rnUfCon (UfLitLitAlt lit ty) _
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfLitLitAlt lit ty', fvs)
\end{code}
+%*********************************************************
+%* *
+\subsection{Rule shapes}
+%* *
+%*********************************************************
+
+Check the shape of a transformation rule LHS. Currently
+we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
+not one of the @forall@'d variables.
\begin{code}
-dupNameExportWarn locn names@((n,_):_)
- = addShortWarnLocLine locn $ \ sty ->
- ppCat [pprNonSym sty n, ppStr "exported", ppInt (length names), ppStr "times"]
-
-dupLocalsExportErr locn locals@((str,_):_)
- = addErrLoc locn "exported names have same local name" $ \ sty ->
- ppInterleave ppSP (map (pprNonSym sty . snd) locals)
-
-classOpExportErr op locn
- = addShortErrLocLine locn $ \ sty ->
- ppBesides [ppStr "class operation `", ppr sty op, ppStr "' can only be exported with its class"]
-
-fieldExportErr op locn
- = addShortErrLocLine locn $ \ sty ->
- ppBesides [ppStr "field name `", ppr sty op, ppStr "' can only be exported with its data type"]
-
-synAllExportErr is_error syn locn
- = (if is_error then addShortErrLocLine else addShortWarnLocLine) locn $ \ sty ->
- ppBesides [ppStr "type synonym `", ppr sty syn, ppStr "' should be exported abstractly"]
-
-withExportErr str rn has rns locn
- = addErrLoc locn "" $ \ sty ->
- ppAboves [ ppBesides [ppStr "inconsistent list of ", ppStr str, ppStr " in export list for `", ppr sty rn, ppStr "'"],
- ppCat [ppStr " expected:", ppInterleave ppComma (map (ppr sty) has)],
- ppCat [ppStr " found: ", ppInterleave ppComma (map (ppr sty) rns)] ]
-
-importAllErr rn locn
- = addShortErrLocLine locn $ \ sty ->
- ppBesides [ ppStr "`", pprNonSym sty rn, ppStr "' has been exported with (..), but is only imported abstractly"]
-
-badModExportErr mod locn
- = addShortErrLocLine locn $ \ sty ->
- ppCat [ ppStr "unknown module in export list: module", ppPStr mod]
-
-emptyModExportWarn locn mod
- = addShortWarnLocLine locn $ \ sty ->
- ppCat [ppStr "module", ppPStr mod, ppStr "has no unqualified imports to export"]
-
-dupModExportWarn locn mods@(mod:_)
- = addShortWarnLocLine locn $ \ sty ->
- ppCat [ppStr "module", ppPStr mod, ppStr "appears", ppInt (length mods), ppStr "times in export list"]
-
-derivingNonStdClassErr clas locn
- = addShortErrLocLine locn $ \ sty ->
- ppCat [ppStr "non-standard class in deriving:", ppr sty clas]
-
-dupDefaultDeclErr (DefaultDecl _ locn1 : dup_things) sty
- = ppAboves (item1 : map dup_item dup_things)
+validRuleLhs foralls lhs
+ = check lhs
where
- item1
- = addShortErrLocLine locn1 (\ sty ->
- ppStr "multiple default declarations") sty
-
- dup_item (DefaultDecl _ locn)
- = addShortErrLocLine locn (\ sty ->
- ppStr "here was another default declaration") sty
-
-undefinedFixityDeclErr locn decl
- = addErrLoc locn "fixity declaration for unknown operator" $ \ sty ->
- ppr sty decl
-
-dupFixityDeclErr locn dups
- = addErrLoc locn "multiple fixity declarations for same operator" $ \ sty ->
- ppAboves (map (ppr sty) dups)
-
-classTyVarNotInOpTyErr clas_tyvar sig locn
- = addShortErrLocLine locn $ \ sty ->
- ppHang (ppBesides [ppStr "Class type variable `", ppr sty clas_tyvar, ppStr "' does not appear in method signature:"])
- 4 (ppr sty sig)
-
-classTyVarInOpCtxtErr clas_tyvar sig locn
- = addShortErrLocLine locn $ \ sty ->
- ppHang (ppBesides [ppStr "Class type variable `", ppr sty clas_tyvar, ppStr "' present in method's local overloading context:"])
- 4 (ppr sty sig)
-
-dupClassAssertWarn ctxt locn dups
- = addShortWarnLocLine locn $ \ sty ->
- ppHang (ppBesides [ppStr "Duplicate class assertion `", ppr sty dups, ppStr "' in context:"])
- 4 (ppr sty ctxt)
+ check (HsApp e1 e2) = check e1
+ check (HsVar v) | v `notElem` foralls = True
+ check other = False
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Errors}
+%* *
+%*********************************************************
+
+\begin{code}
+derivingNonStdClassErr clas
+ = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")]
+
+classTyVarNotInOpTyErr clas_tyvar sig
+ = hang (hsep [ptext SLIT("Class type variable"),
+ quotes (ppr clas_tyvar),
+ ptext SLIT("does not appear in method signature")])
+ 4 (ppr sig)
+
+badDataCon name
+ = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
+
+forAllWarn doc ty tyvar
+ = doptRn Opt_WarnUnusedMatches `thenRn` \ warn_unused -> case () of
+ () | not warn_unused -> returnRn ()
+ | otherwise
+ -> getModeRn `thenRn` \ mode ->
+ case mode of {
+#ifndef DEBUG
+ InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files
+ -- unless DEBUG is on, in which case it is slightly
+ -- informative. They can arise from mkRhsTyLam,
+#endif -- leading to (say) f :: forall a b. [b] -> [b]
+ other ->
+ addWarnRn (
+ sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ $$
+ (ptext SLIT("In") <+> doc)
+ )
+ }
+
+badRuleLhsErr name lhs
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)]
+ $$
+ ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
+
+badRuleVar name var
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
+ ptext SLIT("does not appear on left hand side")]
+
+badExtName :: ExtName -> Message
+badExtName ext_nm
+ = sep [quotes (ppr ext_nm) <+> ptext SLIT("is not a valid C identifier")]
+
+dupClassAssertWarn ctxt (assertion : dups)
+ = sep [hsep [ptext SLIT("Duplicate class assertion"),
+ quotes (ppr assertion),
+ ptext SLIT("in the context:")],
+ nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))]
+
+naughtyCCallContextErr (HsPClass clas _)
+ = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas),
+ ptext SLIT("in a context")]
\end{code}