X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=f74c71244e1309bda2020269a6685577dcf6042a;hb=715184e20183fbdc71383cbc0b1e07598c91b165;hp=277862f3bf0e4da3390dcea8318692d494b9cea0;hpb=573ef10b2afd99d3c6a36370a9367609716c97d2;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 277862f..f74c712 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -1,662 +1,761 @@ % -% (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 ( + rnSrcDecls, checkModDeprec, + rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, + rnBinds, rnBindsAndThen, rnStats, + ) where -IMP_Ubiq() -IMPORT_DELOOPER(RnLoop) -- *check* the RnPass/RnExpr/RnBinds loop-breaking -IMPORT_1_3(List(partition)) +#include "HsVersions.h" import HsSyn -import HsPragmas -import RdrHsSyn +import RdrName ( RdrName, isRdrDataCon, elemRdrEnv ) +import RdrHsSyn ( RdrNameConDecl, RdrNameTyClDecl, + RdrNameDeprecation, RdrNameFixitySig, + RdrNameHsBinds, + extractGenericPatTyVars + ) import RnHsSyn -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 ( isDataCon, 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 HsCore +import RnExpr ( rnExpr ) +import RnTypes ( rnHsType, rnHsSigType, rnHsTypeFVs, rnContext ) + +import RnBinds ( rnTopMonoBinds, rnMonoBinds, rnMethodBinds, + rnMonoBindsAndThen, renameSigs, checkSigs ) +import RnEnv ( lookupTopBndrRn, lookupOccRn, lookupSysBndr, + newLocalsRn, lookupGlobalOccRn, + bindLocalsFV, bindPatSigTyVarsFV, + bindTyVarsRn, extendTyVarEnvFVRn, + bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames, + checkDupOrQualNames, checkDupNames, mapFvRn, + lookupTopSrcBndr_maybe, lookupTopSrcBndr, + dataTcOccs, newIPName, unknownNameErr + ) +import TcRnMonad + +import BasicTypes ( FixitySig(..), TopLevelFlag(..) ) +import HscTypes ( ExternalPackageState(..), FixityEnv, + Deprecations(..), plusDeprecs ) +import Module ( moduleEnvElts ) +import Class ( FunDep, DefMeth (..) ) +import TyCon ( DataConDetails(..), visibleDataCons ) +import Name ( Name ) +import NameSet +import NameEnv +import ErrUtils ( dumpIfSet ) +import PrelNames ( newStablePtrName, bindIOName, returnIOName + -- dotnet interop + , objectTyConName, + , unmarshalObjectName, marshalObjectName + , unmarshalStringName, marshalStringName + , checkDotnetResName + ) +import List ( partition ) +import Bag ( bagToList ) +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 ( DynFlag(..) ) + -- Warn of unused for-all'd tyvars +import Maybes ( maybeToBool, seqMaybe ) +import Maybe ( maybe, catMaybes, isNothing ) \end{code} -rnSource `renames' the source module and export list. +@rnSourceDecl@ `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 - ([(Name, ExportFlag)], -- export module X stuff - [(Name, ExportFlag)]), - 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 $ - - rnExports (mod:imp_mods) unqual_imps exports `thenRn` \ (exported_fn, module_dotdots) -> - rnFixes fixes `thenRn` \ src_fixes -> - let - all_fixes = src_fixes ++ bagToList imp_fixes - all_fixes_fm = listToUFM (map pair_name all_fixes) +rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name, DefUses) + +rnSrcDecls (HsGroup { hs_valds = MonoBind binds sigs _, + hs_tyclds = tycl_decls, + hs_instds = inst_decls, + hs_fixds = fix_decls, + hs_depds = deprec_decls, + hs_fords = foreign_decls, + hs_defds = default_decls, + hs_ruleds = rule_decls, + hs_coreds = core_decls }) + + = do { -- Deal with deprecations (returns only the extra deprecations) + deprecs <- rnSrcDeprecDecls deprec_decls ; + updGblEnv (\gbl -> gbl { tcg_deprecs = tcg_deprecs gbl `plusDeprecs` deprecs }) + $ do { + + -- Deal with top-level fixity decls + -- (returns the total new fixity env) + fix_env <- rnSrcFixityDecls fix_decls ; + updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env }) + $ do { + + -- Rename other declarations + (rn_val_decls, bind_dus) <- rnTopMonoBinds binds sigs ; + + -- You might think that we could build proper def/use information + -- for type and class declarations, but they can be involved + -- in mutual recursion across modules, and we only do the SCC + -- analysis for them in the type checker. + -- So we content ourselves with gathering uses only; that + -- means we'll only report a declaration as unused if it isn't + -- mentioned at all. Ah well. + (rn_tycl_decls, src_fvs1) <- mapFvRn rnSrcTyClDecl tycl_decls ; + (rn_inst_decls, src_fvs2) <- mapFvRn rnSrcInstDecl inst_decls ; + (rn_rule_decls, src_fvs3) <- mapFvRn rnHsRuleDecl rule_decls ; + (rn_foreign_decls, src_fvs4) <- mapFvRn rnHsForeignDecl foreign_decls ; + (rn_default_decls, src_fvs5) <- mapFvRn rnDefaultDecl default_decls ; + (rn_core_decls, src_fvs6) <- mapFvRn rnCoreDecl core_decls ; + + let { + rn_group = HsGroup { hs_valds = rn_val_decls, + hs_tyclds = rn_tycl_decls, + hs_instds = rn_inst_decls, + hs_fixds = [], + hs_depds = [], + hs_fords = rn_foreign_decls, + hs_defds = rn_default_decls, + hs_ruleds = rn_rule_decls, + hs_coreds = rn_core_decls } ; + + other_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3, + src_fvs4, src_fvs5, src_fvs6] ; + src_dus = bind_dus `plusDU` usesOnly other_fvs + } ; + + tcg_env <- getGblEnv ; + return (tcg_env, rn_group, src_dus) + }}} +\end{code} - 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, module_dotdots, - occ_info - ) + +%********************************************************* +%* * + Source-code fixity declarations +%* * +%********************************************************* + +\begin{code} +rnSrcFixityDecls :: [RdrNameFixitySig] -> TcRn m FixityEnv +rnSrcFixityDecls fix_decls + = getGblEnv `thenM` \ gbl_env -> + foldlM rnFixityDecl (tcg_fix_env gbl_env) + fix_decls `thenM` \ fix_env -> + traceRn (text "fixity env" <+> ppr fix_env) `thenM_` + returnM fix_env + +rnFixityDecl :: FixityEnv -> RdrNameFixitySig -> TcRn m FixityEnv +rnFixityDecl fix_env (FixitySig rdr_name fixity loc) + = -- GHC extension: look up both the tycon and data con + -- for con-like things + -- If neither are in scope, report an error; otherwise + -- add both to the fixity env + mappM lookupTopSrcBndr_maybe (dataTcOccs rdr_name) `thenM` \ maybe_ns -> + case catMaybes maybe_ns of + [] -> addSrcLoc loc $ + addErr (unknownNameErr rdr_name) `thenM_` + returnM fix_env + ns -> foldlM add fix_env ns where - trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing - trashed_imports = {-trace "rnSource:trashed_imports"-} [] + add fix_env name + = case lookupNameEnv fix_env name of + Just (FixitySig _ _ loc') -> addErr (dupFixityDecl rdr_name loc loc') `thenM_` + returnM fix_env + Nothing -> returnM (extendNameEnv fix_env name (FixitySig name fixity loc)) + +dupFixityDecl rdr_name loc1 loc2 + = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name), + ptext SLIT("at ") <+> ppr loc1, + ptext SLIT("and") <+> ppr loc2] \end{code} %********************************************************* +%* * + Source-code deprecations declarations +%* * +%********************************************************* + +For deprecations, all we do is check that the names are in scope. +It's only imported deprecations, dealt with in RnIfaces, that we +gather them together. + +\begin{code} +rnSrcDeprecDecls :: [RdrNameDeprecation] -> TcRn m Deprecations +rnSrcDeprecDecls [] + = returnM NoDeprecs + +rnSrcDeprecDecls decls + = mappM rn_deprec decls `thenM` \ pairs -> + returnM (DeprecSome (mkNameEnv (catMaybes pairs))) + where + rn_deprec (Deprecation rdr_name txt loc) + = addSrcLoc loc $ + lookupTopSrcBndr rdr_name `thenM` \ name -> + returnM (Just (name, (name,txt))) + +checkModDeprec :: Maybe DeprecTxt -> Deprecations +-- Check for a module deprecation; done once at top level +checkModDeprec Nothing = NoDeprecs +checkModdeprec (Just txt) = DeprecAll txt + +badDeprec d + = sep [ptext SLIT("Illegal deprecation when whole module is deprecated"), + nest 4 (ppr d)] +\end{code} + +%********************************************************* %* * -\subsection{Export list} +\subsection{Source code declarations} %* * %********************************************************* \begin{code} -rnExports :: [Module] - -> Bag (Module,RnName) - -> Maybe [RdrNameIE] - -> RnM s (Name -> ExportFlag, -- main export-flag fun - ([(Name,ExportFlag)], -- info about "module X" exports - [(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 - = --pprTrace "get_mod_names" (ppAboves [ppPStr mod, interpp'SP PprDebug (map fst tcs), interpp'SP PprDebug (map fst vals)]) $ - (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', fun_looking rn] - empty_mod = if null tcs && null vals - then Just mod - else Nothing - - -- fun_looking: must avoid class ops and data constructors - -- and record fieldnames - fun_looking (RnName _) = True - fun_looking (WiredInId i) = not (isDataCon i) - fun_looking _ = False - - -- 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, (mod_vals, mod_tcs)) - ------------------------------------- --- rename an "IE" in the export list - -rnIE :: [Module] -- this module and all the (directly?) imported modules - -> RdrNameIE - -> RnM s ( - Maybe Module, -- Just m => a "module X" export item - (Bag (Name, ExportFlag), -- Exported tycons/classes - Bag (Name, ExportFlag))) -- Exported values - -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) +rnSrcTyClDecl tycl_decl + = rnTyClDecl tycl_decl `thenM` \ new_decl -> + finishSourceTyClDecl tycl_decl new_decl `thenM` \ (new_decl', fvs) -> + returnM (new_decl', fvs `plusFV` tyClDeclFVs new_decl') + +rnSrcInstDecl inst + = rnInstDecl inst `thenM` \ new_inst -> + finishSourceInstDecl inst new_inst `thenM` \ (new_inst', fvs) -> + returnM (new_inst', fvs `plusFV` instDeclFVs new_inst') + +rnDefaultDecl (DefaultDecl tys src_loc) + = addSrcLoc src_loc $ + mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) -> + returnM (DefaultDecl tys' src_loc, fvs) 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) + doc_str = text "In a `default' declaration" + + +rnCoreDecl (CoreDecl name ty rhs loc) + = addSrcLoc loc $ + lookupTopBndrRn name `thenM` \ name' -> + rnHsTypeFVs doc_str ty `thenM` \ (ty', ty_fvs) -> + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (CoreDecl name' ty' rhs' loc, + ty_fvs `plusFV` ufExprFVs rhs') 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 "In the Core declaration for" <+> quotes (ppr name) \end{code} %********************************************************* %* * -\subsection{Type declarations} + Bindings %* * %********************************************************* -@rnTyDecl@ uses the `global name function' to create a new type -declaration in which local names have been replaced by their original -names, reporting any unknown names. - -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. +These chaps are here, rather than in TcBinds, so that there +is just one hi-boot file (for RnSource). rnSrcDecls is part +of the loop too, and it must be defined in this module. \begin{code} -rnTyDecl :: RdrNameTyDecl -> RnM_Fixes s RenamedTyDecl - -rnTyDecl (TyData context tycon tyvars condecls derivings pragmas 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 condecls `thenRn` \ condecls' -> - rn_derivs tycon' src_loc derivings `thenRn` \ derivings' -> - ASSERT(isNoDataPragmas pragmas) - returnRn (TyData context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc) - -rnTyDecl (TyNew context tycon tyvars condecl derivings pragmas 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) - -rnTyDecl (TySynonym name tyvars ty 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 - -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" +rnBinds :: RdrNameHsBinds -> RnM (RenamedHsBinds, DefUses) +-- This version assumes that the binders are already in scope +-- It's used only in 'mdo' +rnBinds EmptyBinds = returnM (EmptyBinds, emptyDUs) +rnBinds (MonoBind bind sigs _) = rnMonoBinds NotTopLevel bind sigs +rnBinds b@(IPBinds bind _) = addErr (badIpBinds b) `thenM_` + returnM (EmptyBinds, emptyDUs) + +rnBindsAndThen :: RdrNameHsBinds + -> (RenamedHsBinds -> RnM (result, FreeVars)) + -> RnM (result, FreeVars) +-- This version (a) assumes that the binding vars are not already in scope +-- (b) removes the binders from the free vars of the thing inside +-- The parser doesn't produce ThenBinds +rnBindsAndThen EmptyBinds thing_inside = thing_inside EmptyBinds +rnBindsAndThen (MonoBind bind sigs _) thing_inside = rnMonoBindsAndThen bind sigs thing_inside +rnBindsAndThen (IPBinds binds is_with) thing_inside + = warnIf is_with withWarning `thenM_` + rnIPBinds binds `thenM` \ (binds',fv_binds) -> + thing_inside (IPBinds binds' is_with) `thenM` \ (thing, fvs_thing) -> + returnM (thing, fvs_thing `plusFV` fv_binds) \end{code} -@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. + +%************************************************************************ +%* * +\subsubsection{@rnIPBinds@s: in implicit parameter bindings} * +%* * +%************************************************************************ \begin{code} -rnConDecls :: TyVarNamesEnv - -> [RdrNameConDecl] - -> RnM_Fixes s [RenamedConDecl] +rnIPBinds [] = returnM ([], emptyFVs) +rnIPBinds ((n, expr) : binds) + = newIPName n `thenM` \ name -> + rnExpr expr `thenM` \ (expr',fvExpr) -> + rnIPBinds binds `thenM` \ (binds',fvBinds) -> + returnM ((name, expr') : binds', fvExpr `plusFV` fvBinds) -rnConDecls tv_env con_decls - = mapRn rn_decl con_decls - 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) \end{code} + %********************************************************* -%* * -\subsection{SPECIALIZE data pragmas} -%* * +%* * +\subsection{Foreign declarations} +%* * %********************************************************* \begin{code} -rnSpecDataSig :: RdrNameSpecDataSig - -> RnM_Fixes s RenamedSpecDataSig +rnHsForeignDecl (ForeignImport name ty spec isDeprec src_loc) + = addSrcLoc src_loc $ + lookupTopBndrRn name `thenM` \ name' -> + rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) -> + returnM (ForeignImport name' ty' spec isDeprec src_loc, + fvs `plusFV` extras spec) + where + extras (CImport _ _ _ _ CWrapper) + = mkFVs [ newStablePtrName + , bindIOName + , returnIOName + ] + extras (DNImport _) + = mkFVs [ bindIOName + , objectTyConName + , unmarshalObjectName + , marshalObjectName + , marshalStringName + , unmarshalStringName + , checkDotnetResName + ] + extras _ = emptyFVs + +rnHsForeignDecl (ForeignExport name ty spec isDeprec src_loc) + = addSrcLoc src_loc $ + lookupOccRn name `thenM` \ name' -> + rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) -> + returnM (ForeignExport name' ty' spec isDeprec src_loc, + mkFVs [name', bindIOName, returnIOName] `plusFV` fvs ) + -- NB: a foreign export is an *occurrence site* for name, so + -- we add it to the free-variable list. It might, for example, + -- be imported from another module + +fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name +\end{code} + + +%********************************************************* +%* * +\subsection{Instance declarations} +%* * +%********************************************************* -rnSpecDataSig (SpecDataSig tycon ty src_loc) - = pushSrcLocRn src_loc $ +\begin{code} +rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc) + -- Used for both source and interface file decls + = addSrcLoc src_loc $ + rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' -> + + (case maybe_dfun_rdr_name of + Nothing -> returnM Nothing + Just dfun_rdr_name -> lookupGlobalOccRn dfun_rdr_name `thenM` \ dfun_name -> + returnM (Just dfun_name) + ) `thenM` \ maybe_dfun_name -> + + -- The typechecker checks that all the bindings are for the right class. + returnM (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc) + +-- Compare finishSourceTyClDecl +finishSourceInstDecl (InstDecl _ mbinds uprags _ _ ) + (InstDecl inst_ty _ _ maybe_dfun_name src_loc) + -- Used for both source decls only + = ASSERT( not (maybeToBool maybe_dfun_name) ) -- Source decl! let - tyvars = extractMonoTyNames is_tyvar_name ty + meth_doc = text "In the bindings in an instance declaration" + meth_names = collectLocatedMonoBinders mbinds + (inst_tyvars, _, cls,_) = splitHsInstDeclTy inst_ty + -- (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 `thenM_` + extendTyVarEnvForMethodBinds inst_tyvars ( + rnMethodBinds cls [] mbinds + ) `thenM` \ (mbinds', meth_fvs) -> + let + binders = collectMonoBinders mbinds' + 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 uprags) `thenM` \ uprags' -> + checkSigs (okInstDclSig (mkNameSet binders)) uprags' `thenM_` + + returnM (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc, + meth_fvs `plusFV` hsSigsFVs uprags') \end{code} %********************************************************* %* * -\subsection{Class declarations} +\subsection{Rules} %* * %********************************************************* -@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} +rnIfaceRuleDecl (IfaceRule rule_name act vars fn args rhs src_loc) + = addSrcLoc src_loc $ + lookupOccRn fn `thenM` \ fn' -> + rnCoreBndrs vars $ \ vars' -> + mappM rnCoreExpr args `thenM` \ args' -> + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (IfaceRule rule_name act vars' fn' args' rhs' src_loc) + +rnIfaceRuleDecl (IfaceRuleOut fn rule) -- Builtin rules come this way + = lookupOccRn fn `thenM` \ fn' -> + returnM (IfaceRuleOut fn' rule) + +rnHsRuleDecl (HsRule rule_name act vars lhs rhs src_loc) + = addSrcLoc src_loc $ + bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $ + + bindLocalsFV doc (map get_var vars) $ \ ids -> + mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) -> + + rnExpr lhs `thenM` \ (lhs', fv_lhs) -> + rnExpr rhs `thenM` \ (rhs', fv_rhs) -> + let + mb_bad = validRuleLhs ids lhs' + in + checkErr (isNothing mb_bad) + (badRuleLhsErr rule_name lhs' mb_bad) `thenM_` + let + bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)] + in + mappM (addErr . badRuleVar rule_name) bad_vars `thenM_` + returnM (HsRule rule_name act vars' lhs' rhs' src_loc, + fv_vars `plusFV` fv_lhs `plusFV` fv_rhs) + where + doc = text "In the transformation rule" <+> ftext rule_name + + get_var (RuleBndr v) = v + get_var (RuleBndrSig v _) = v + + rn_var (RuleBndr v, id) = returnM (RuleBndr id, emptyFVs) + rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenM` \ (t', fvs) -> + returnM (RuleBndrSig id t', fvs) +\end{code} + +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. We also restrict the form of the LHS so +that it may be plausibly matched. Basically you only get to write ordinary +applications. (E.g. a case expression is not allowed: too elaborate.) + +NB: if you add new cases here, make sure you add new ones to TcRule.ruleLhsTvs \begin{code} -rnClassDecl :: RdrNameClassDecl -> RnM_Fixes s RenamedClassDecl - -rnClassDecl (ClassDecl context cname tyvar sigs mbinds pragmas 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) +validRuleLhs :: [Name] -> RenamedHsExpr -> Maybe RenamedHsExpr +-- Nothing => OK +-- Just e => Not ok, and e is the offending expression +validRuleLhs foralls lhs + = check lhs 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) + check (OpApp e1 op _ e2) = check op `seqMaybe` check_e e1 `seqMaybe` check_e e2 + check (HsApp e1 e2) = check e1 `seqMaybe` check_e e2 + check (HsVar v) | v `notElem` foralls = Nothing + check other = Just other -- Failure + + check_e (HsVar v) = Nothing + check_e (HsPar e) = check_e e + check_e (HsLit e) = Nothing + check_e (HsOverLit e) = Nothing + + check_e (OpApp e1 op _ e2) = check_e e1 `seqMaybe` check_e op `seqMaybe` check_e e2 + check_e (HsApp e1 e2) = check_e e1 `seqMaybe` check_e e2 + check_e (NegApp e _) = check_e e + check_e (ExplicitList _ es) = check_es es + check_e (ExplicitTuple es _) = check_es es + check_e other = Just other -- Fails + + check_es es = foldr (seqMaybe . check_e) Nothing es \end{code} %********************************************************* %* * -\subsection{Instance declarations} +\subsection{Type, class and iface sig declarations} %* * %********************************************************* +@rnTyDecl@ uses the `global name function' to create a new type +declaration in which local names have been replaced by their original +names, reporting any unknown names. -@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. +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. \begin{code} -rnInstDecl :: RdrNameInstDecl -> RnM_Fixes s RenamedInstDecl +rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc}) + = addSrcLoc loc $ + lookupTopBndrRn name `thenM` \ name' -> + rnHsType doc_str ty `thenM` \ ty' -> + mappM rnIdInfo id_infos `thenM` \ id_infos' -> + returnM (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc}) + where + doc_str = text "In the interface signature for" <+> quotes (ppr name) + +rnTyClDecl (ForeignType {tcdName = name, tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc}) + = addSrcLoc loc $ + lookupTopBndrRn name `thenM` \ name' -> + returnM (ForeignType {tcdName = name', tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc}) + +rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon, + tcdTyVars = tyvars, tcdCons = condecls, tcdGeneric = want_generic, + tcdDerivs = derivs, tcdLoc = src_loc}) + = addSrcLoc src_loc $ + lookupTopBndrRn tycon `thenM` \ tycon' -> + bindTyVarsRn data_doc tyvars $ \ tyvars' -> + rnContext data_doc context `thenM` \ context' -> + rn_derivs derivs `thenM` \ derivs' -> + checkDupOrQualNames data_doc con_names `thenM_` + + rnConDecls tycon' condecls `thenM` \ condecls' -> + returnM (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon', + tcdTyVars = tyvars', tcdCons = condecls', tcdGeneric = want_generic, + tcdDerivs = derivs', tcdLoc = src_loc}) + where + data_doc = text "In the data type declaration for" <+> quotes (ppr tycon) + con_names = map conDeclName (visibleDataCons condecls) + + rn_derivs Nothing = returnM Nothing + rn_derivs (Just ds) = rnContext data_doc ds `thenM` \ ds' -> returnM (Just ds') + +rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc}) + = addSrcLoc src_loc $ + lookupTopBndrRn name `thenM` \ name' -> + bindTyVarsRn syn_doc tyvars $ \ tyvars' -> + rnHsType syn_doc ty `thenM` \ ty' -> + returnM (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc}) + where + syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name) + +rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname, + tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs, + tcdLoc = src_loc}) + -- Used for both source and interface file decls + = addSrcLoc src_loc $ + + lookupTopBndrRn cname `thenM` \ cname' -> -rnInstDecl (InstDecl cname ty mbinds from_here modname uprags pragmas src_loc) - = pushSrcLocRn src_loc $ - lookupClass cname `thenRn` \ cname' -> + -- Tyvars scope over superclass context and method signatures + bindTyVarsRn cls_doc tyvars $ \ tyvars' -> - rnPolyType [] ty `thenRn` \ ty' -> - -- [] tv_env ensures that tyvars will be foralled + -- Check the superclasses + rnContext cls_doc context `thenM` \ context' -> - rnMethodBinds cname' mbinds `thenRn` \ mbinds' -> - mapRn (rn_uprag cname') uprags `thenRn` \ new_uprags -> + -- Check the functional dependencies + rnFds cls_doc fds `thenM` \ fds' -> - ASSERT(isNoInstancePragmas pragmas) - returnRn (InstDecl cname' ty' mbinds' - from_here modname new_uprags noInstancePragmas src_loc) + -- 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 `thenM_` + mappM (rnClassOp cname' fds') op_sigs `thenM` \ sigs' -> + renameSigs non_op_sigs `thenM` \ non_ops' -> + checkSigs okClsDclSig non_ops' `thenM_` + -- 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. + + returnM (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars', + tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing, + tcdLoc = src_loc}) + where + cls_doc = text "In the declaration for class" <+> ppr cname + sig_doc = text "In the signatures for class" <+> ppr cname + +rnClassOp clas clas_fds sig@(ClassOpSig op dm_stuff ty locn) + = addSrcLoc locn $ + lookupTopBndrRn op `thenM` \ op_name -> + + -- Check the signature + rnHsSigType (quotes (ppr op)) ty `thenM` \ new_ty -> + + -- Make the default-method name + (case dm_stuff of + DefMeth dm_rdr_name + -> -- Imported class that has a default method decl + lookupSysBndr dm_rdr_name `thenM` \ dm_name -> + returnM (DefMeth 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 + + GenDefMeth -> returnM GenDefMeth + NoDefMeth -> returnM NoDefMeth + ) `thenM` \ dm_stuff' -> + + returnM (ClassOpSig op_name dm_stuff' new_ty locn) + +finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnM (RenamedTyClDecl, FreeVars) + -- Used for source file decls only + -- Renames the default-bindings of a class decl +finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here + rn_cls_decl@(ClassDecl {tcdName = cls, tcdTyVars = tyvars}) -- Everything else is here + -- There are some default-method bindings (abeit possibly empty) so + -- this is a source-code class declaration + = -- 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 + addSrcLoc src_loc $ + extendTyVarEnvForMethodBinds tyvars $ + getLocalRdrEnv `thenM` \ name_env -> + let + meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds + gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds, + not (tv `elemRdrEnv` name_env)] + in + checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenM_` + newLocalsRn gen_rdr_tyvars_w_locs `thenM` \ gen_tyvars -> + rnMethodBinds cls gen_tyvars mbinds `thenM` \ (mbinds', meth_fvs) -> + returnM (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs) 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) - - 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) + meth_doc = text "In the default-methods for class" <+> ppr (tcdName rn_cls_decl) + +finishSourceTyClDecl _ tycl_decl@(TyData {tcdDerivs = derivings}) + -- Derivings are returned here so that they don't form part of the tyClDeclFVs. + -- This is important, because tyClDeclFVs should contain only the + -- FVs that are `needed' by the interface file declaration, and + -- derivings do not appear in this. It also means that the tcGroups + -- are smaller, which turned out to be important for the usage inference. KSW 2002-02. + = returnM (tycl_decl, + maybe emptyFVs extractHsCtxtTyNames derivings) + +finishSourceTyClDecl _ tycl_decl = returnM (tycl_decl, emptyFVs) + -- Not a class declaration \end{code} -%********************************************************* -%* * -\subsection{@SPECIALIZE instance@ user-pragmas} -%* * -%********************************************************* +For the method bindings in class and instance decls, we extend the +type variable environment iff -fglasgow-exts \begin{code} -rnSpecInstSig :: RdrNameSpecInstSig - -> RnM_Fixes s RenamedSpecInstSig - -rnSpecInstSig (SpecInstSig clas ty src_loc) - = pushSrcLocRn src_loc $ - let - tyvars = extractMonoTyNames is_tyvar_name ty - 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) +extendTyVarEnvForMethodBinds tyvars thing_inside + = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts -> + if opt_GlasgowExts then + extendTyVarEnvFVRn (map hsTyVarName tyvars) thing_inside + else + thing_inside \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] - -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} +conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) +conDeclName (ConDecl n _ _ _ l) = (n,l) + +rnConDecls :: Name -> DataConDetails RdrNameConDecl -> RnM (DataConDetails RenamedConDecl) +rnConDecls tycon Unknown = returnM Unknown +rnConDecls tycon (HasCons n) = returnM (HasCons n) +rnConDecls tycon (DataCons condecls) + = -- Check that there's at least one condecl, + -- or else we're reading an interface file, or -fglasgow-exts + (if null condecls then + doptM Opt_GlasgowExts `thenM` \ glaExts -> + getModeRn `thenM` \ mode -> + checkErr (glaExts || isInterfaceMode mode) + (emptyConDeclsErr tycon) + else returnM () + ) `thenM_` + + mappM rnConDecl condecls `thenM` \ condecls' -> + returnM (DataCons condecls') + +rnConDecl :: RdrNameConDecl -> RnM RenamedConDecl +rnConDecl (ConDecl name tvs cxt details locn) + = addSrcLoc locn $ + checkConName name `thenM_` + lookupTopBndrRn name `thenM` \ new_name -> + + bindTyVarsRn doc tvs $ \ new_tyvars -> + rnContext doc cxt `thenM` \ new_context -> + rnConDetails doc locn details `thenM` \ new_details -> + returnM (ConDecl new_name new_tyvars new_context new_details locn) + where + doc = text "In the definition of data constructor" <+> quotes (ppr name) -%************************************************************************* -%* * -\subsection{Fixity declarations} -%* * -%************************************************************************* +rnConDetails doc locn (PrefixCon tys) + = mappM (rnBangTy doc) tys `thenM` \ new_tys -> + returnM (PrefixCon new_tys) -\begin{code} -rnFixes :: [RdrNameFixityDecl] -> RnM s [RenamedFixityDecl] +rnConDetails doc locn (InfixCon ty1 ty2) + = rnBangTy doc ty1 `thenM` \ new_ty1 -> + rnBangTy doc ty2 `thenM` \ new_ty2 -> + returnM (InfixCon new_ty1 new_ty2) -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 (RecCon fields) + = checkDupOrQualNames doc field_names `thenM_` + mappM (rnField doc) fields `thenM` \ new_fields -> + returnM (RecCon new_fields) + where + field_names = [(fld, locn) | (fld, _) <- fields] + +rnField doc (name, ty) + = lookupTopBndrRn name `thenM` \ new_name -> + rnBangTy doc ty `thenM` \ new_ty -> + returnM (new_name, new_ty) + +rnBangTy doc (BangType s ty) + = rnHsType doc ty `thenM` \ new_ty -> + returnM (BangType s new_ty) + +-- 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 + = checkErr (isRdrDataCon name) (badDataCon name) \end{code} + %********************************************************* %* * \subsection{Support code to rename types} @@ -664,180 +763,239 @@ rnFixes fixities %********************************************************* \begin{code} -rnPolyType :: TyVarNamesEnv - -> RdrNamePolyType - -> RnM_Fixes s RenamedPolyType +rnFds :: SDoc -> [FunDep RdrName] -> RnM [FunDep Name] -rnPolyType tv_env (HsForAllTy tvs ctxt ty) - = rn_poly_help tv_env tvs ctxt ty - -rnPolyType tv_env (HsPreForAllTy ctxt ty) - = rn_poly_help tv_env forall_tyvars ctxt ty +rnFds doc fds + = mappM rn_fds fds 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) -> - let - tv_env2 = catTyVarNamesEnvs tv_env1 tv_env - 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) + rn_fds (tys1, tys2) + = rnHsTyVars doc tys1 `thenM` \ tys1' -> + rnHsTyVars doc tys2 `thenM` \ tys2' -> + returnM (tys1', tys2') + +rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs +rnHsTyvar doc tyvar = lookupOccRn tyvar \end{code} +%********************************************************* +%* * +\subsection{IdInfo} +%* * +%********************************************************* + \begin{code} -rnMonoType :: TyVarNamesEnv - -> RdrNameMonoType - -> RnM_Fixes s RenamedMonoType - -rnMonoType tv_env (MonoTyVar tyvar) - = lookupTyVarName tv_env tyvar `thenRn` \ tyvar' -> - returnRn (MonoTyVar tyvar') - -rnMonoType tv_env (MonoListTy ty) - = rnMonoType tv_env ty `thenRn` \ ty' -> - returnRn (MonoListTy ty') - -rnMonoType tv_env (MonoFunTy ty1 ty2) - = andRn MonoFunTy (rnMonoType tv_env ty1) - (rnMonoType tv_env ty2) - -rnMonoType tv_env (MonoTupleTy tys) - = mapRn (rnMonoType tv_env) tys `thenRn` \ tys' -> - returnRn (MonoTupleTy tys') - -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') +rnIdInfo (HsWorker worker arity) + = lookupOccRn worker `thenM` \ worker' -> + returnM (HsWorker worker' arity) + +rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenM` \ expr' -> + returnM (HsUnfold inline expr') +rnIdInfo (HsStrictness str) = returnM (HsStrictness str) +rnIdInfo (HsArity arity) = returnM (HsArity arity) +rnIdInfo HsNoCafRefs = returnM HsNoCafRefs \end{code} +@UfCore@ expressions. + \begin{code} -rnContext :: TyVarNamesEnv -> SrcLoc -> RdrNameContext -> RnM_Fixes s RenamedContext +rnCoreExpr (UfType ty) + = rnHsType (text "unfolding type") ty `thenM` \ ty' -> + returnM (UfType ty') + +rnCoreExpr (UfVar v) + = lookupOccRn v `thenM` \ v' -> + returnM (UfVar v') + +rnCoreExpr (UfLit l) + = returnM (UfLit l) + +rnCoreExpr (UfLitLit l ty) + = rnHsType (text "litlit") ty `thenM` \ ty' -> + returnM (UfLitLit l ty') + +rnCoreExpr (UfFCall cc ty) + = rnHsType (text "ccall") ty `thenM` \ ty' -> + returnM (UfFCall cc ty') + +rnCoreExpr (UfTuple (HsTupCon boxity arity) args) + = mappM rnCoreExpr args `thenM` \ args' -> + returnM (UfTuple (HsTupCon boxity arity) args') + +rnCoreExpr (UfApp fun arg) + = rnCoreExpr fun `thenM` \ fun' -> + rnCoreExpr arg `thenM` \ arg' -> + returnM (UfApp fun' arg') + +rnCoreExpr (UfCase scrut bndr alts) + = rnCoreExpr scrut `thenM` \ scrut' -> + bindCoreLocalRn bndr $ \ bndr' -> + mappM rnCoreAlt alts `thenM` \ alts' -> + returnM (UfCase scrut' bndr' alts') + +rnCoreExpr (UfNote note expr) + = rnNote note `thenM` \ note' -> + rnCoreExpr expr `thenM` \ expr' -> + returnM (UfNote note' expr') + +rnCoreExpr (UfLam bndr body) + = rnCoreBndr bndr $ \ bndr' -> + rnCoreExpr body `thenM` \ body' -> + returnM (UfLam bndr' body') + +rnCoreExpr (UfLet (UfNonRec bndr rhs) body) + = rnCoreExpr rhs `thenM` \ rhs' -> + rnCoreBndr bndr $ \ bndr' -> + rnCoreExpr body `thenM` \ body' -> + returnM (UfLet (UfNonRec bndr' rhs') body') + +rnCoreExpr (UfLet (UfRec pairs) body) + = rnCoreBndrs bndrs $ \ bndrs' -> + mappM rnCoreExpr rhss `thenM` \ rhss' -> + rnCoreExpr body `thenM` \ body' -> + returnM (UfLet (UfRec (bndrs' `zip` rhss')) body') + 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 `thenM` \ ty' -> + bindCoreLocalRn name $ \ name' -> + thing_inside (UfValBinder name' ty') 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 + = bindCoreLocalRn 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 `thenM` \ con' -> + bindCoreLocalsRn bndrs $ \ bndrs' -> + rnCoreExpr rhs `thenM` \ rhs' -> + returnM (con', bndrs', rhs') + +rnNote (UfCoerce ty) + = rnHsType (text "unfolding coerce") ty `thenM` \ ty' -> + returnM (UfCoerce ty') - cmp_assert (c1,tv1) (c2,tv2) - = (c1 `cmp` c2) `thenCmp` (tv1 `cmp` tv2) +rnNote (UfSCC cc) = returnM (UfSCC cc) +rnNote UfInlineCall = returnM UfInlineCall +rnNote UfInlineMe = returnM UfInlineMe +rnNote (UfCoreNote s) = returnM (UfCoreNote s) + +rnUfCon UfDefault + = returnM UfDefault + +rnUfCon (UfTupleAlt tup_con) + = returnM (UfTupleAlt tup_con) + +rnUfCon (UfDataAlt con) + = lookupOccRn con `thenM` \ con' -> + returnM (UfDataAlt con') + +rnUfCon (UfLitAlt lit) + = returnM (UfLitAlt lit) + +rnUfCon (UfLitLitAlt lit ty) + = rnHsType (text "litlit") ty `thenM` \ ty' -> + returnM (UfLitLitAlt lit ty') \end{code} +%********************************************************* +%* * +\subsection{Statistics} +%* * +%********************************************************* \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) +rnStats :: [RenamedHsDecl] -- Imported decls + -> TcRn m () +rnStats imp_decls + = doptM Opt_D_dump_rn_trace `thenM` \ dump_rn_trace -> + doptM Opt_D_dump_rn_stats `thenM` \ dump_rn_stats -> + doptM Opt_D_dump_rn `thenM` \ dump_rn -> + getEps `thenM` \ eps -> + + ioToTcRn (dumpIfSet (dump_rn_trace || dump_rn_stats || dump_rn) + "Renamer statistics" + (getRnStats eps imp_decls)) `thenM_` + returnM () + +getRnStats :: ExternalPackageState -> [RenamedHsDecl] -> SDoc +getRnStats eps imported_decls + = hcat [text "Renamer stats: ", stats] 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) + n_mods = length [() | _ <- moduleEnvElts (eps_PIT eps)] + -- This is really only right for a one-shot compile + + (decls_map, n_decls_slurped) = eps_decls eps + + n_decls_left = length [decl | (avail, True, (_,decl)) <- nameEnvElts decls_map + -- Data, newtype, and class decls are in the decls_fm + -- under multiple names; the tycon/class, and each + -- constructor/class op too. + -- The 'True' selects just the 'main' decl + ] + + (insts_left, n_insts_slurped) = eps_insts eps + n_insts_left = length (bagToList insts_left) + + (rules_left, n_rules_slurped) = eps_rules eps + n_rules_left = length (bagToList rules_left) + + stats = vcat + [int n_mods <+> text "interfaces read", + hsep [ int n_decls_slurped, text "type/class/variable imported, out of", + int (n_decls_slurped + n_decls_left), text "read"], + hsep [ int n_insts_slurped, text "instance decls imported, out of", + int (n_insts_slurped + n_insts_left), text "read"], + hsep [ int n_rules_slurped, text "rule decls imported, out of", + int (n_rules_slurped + n_rules_left), text "read"] + ] +\end{code} + +%********************************************************* +%* * +\subsection{Errors} +%* * +%********************************************************* + +\begin{code} +badDataCon name + = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] + +badRuleLhsErr name lhs (Just bad_e) + = sep [ptext SLIT("Rule") <+> ftext name <> colon, + nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e, + ptext SLIT("in 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") <+> doubleQuotes (ftext name) <> colon, + ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+> + ptext SLIT("does not appear on left hand side")] + +emptyConDeclsErr tycon + = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"), + nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))] + +withWarning + = sep [quotes (ptext SLIT("with")), + ptext SLIT("is deprecated, use"), + quotes (ptext SLIT("let")), + ptext SLIT("instead")] + +badIpBinds binds + = hang (ptext SLIT("Implicit-parameter bindings illegal in 'mdo':")) 4 + (ppr binds) \end{code} +