X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=d4d43373aaa187f1e8d07a66b0e0232f56110144;hb=f83ad713ad73e583fd138bb17e7341041b36a416;hp=edcb5fefd021d5e87dacdd840a6a7e01f7fb928c;hpb=b4255f2c320f852d7dfb0afc0bc9f64765aece0c;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index edcb5fe..d4d4337 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -1,40 +1,63 @@ % -% (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, rnPolyType ) where +module RnSource ( rnIfaceDecl, rnSourceDecls, rnHsType, rnHsSigType ) where -import Ubiq -import RnLoop -- *check* the RnPass4/RnExpr4/RnBinds4 loop-breaking +#include "HsVersions.h" +import RnExpr import HsSyn +import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) ) import HsPragmas -import RdrHsSyn +import HsTypes ( getTyVarName, pprClassAssertion, cmpHsTypes ) +import RdrName ( RdrName, isRdrDataCon, rdrNameOcc ) +import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, + extractHsTyVars + ) import RnHsSyn +import HsCore + +import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr ) +import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, + lookupImplicitOccRn, addImplicitOccRn, + bindLocalsRn, + bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn, + checkDupOrQualNames, checkDupNames, + newLocallyDefinedGlobalName, newImportedGlobalName, + newImportedGlobalFromRdrName, + newDFunName, + FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV + ) import RnMonad -import RnBinds ( rnTopBinds, rnMethodBinds ) +import Name ( Name, OccName, + ExportFlag(..), Provenance(..), + nameOccName, NamedThing(..), + mkDefaultMethodOcc, mkDFunOcc + ) +import NameSet +import BasicTypes ( TopLevelFlag(..) ) +import TysWiredIn ( tupleTyCon, unboxedTupleTyCon, listTyCon ) +import Type ( funTyCon ) +import FiniteMap ( elemFM ) +import PrelInfo ( derivingOccurrences, numClass_RDR, + deRefStablePtr_NAME, makeStablePtr_NAME, + bindIO_NAME + ) import Bag ( bagToList ) -import Class ( derivableClassKeys ) -import ListSetOps ( unionLists, minusList ) -import Maybes ( maybeToBool, catMaybes ) -import Name ( isLocallyDefined, isAvarid, getLocalName, ExportFlag(..), RdrName ) -import Pretty +import List ( partition ) +import Outputable import SrcLoc ( SrcLoc ) -import Unique ( Unique ) -import UniqFM ( addListToUFM, listToUFM ) -import UniqSet ( UniqSet(..) ) -import Util ( isn'tIn, panic, assertPanic ) - -rnExports mods Nothing = returnRn (\n -> ExportAll) -rnExports mods (Just exps) = returnRn (\n -> ExportAll) +import CmdLineOpts ( opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars +import UniqFM ( lookupUFM ) +import Maybes ( maybeToBool, catMaybes ) +import Util \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} @@ -48,55 +71,60 @@ Checks the (..) etc constraints in the export list. \end{enumerate} +%********************************************************* +%* * +\subsection{Value declarations} +%* * +%********************************************************* + \begin{code} -rnSource :: [Module] -- imported modules - -> Bag RenamedFixityDecl -- fixity info for imported names - -> RdrNameHsModule - -> RnM s (RenamedHsModule, - Name -> ExportFlag, -- export info - Bag (RnName, RdrName)) -- occurrence info - -rnSource imp_mods imp_fixes (HsModule mod version exports _ fixes - ty_decls specdata_sigs class_decls - inst_decls specinst_sigs defaults - binds _ src_loc) +rnSourceDecls :: [RdrNameHsDecl] -> RnMS s ([RenamedHsDecl], FreeVars) + -- The decls get reversed, but that's ok - = pushSrcLocRn src_loc $ +rnSourceDecls decls + = go emptyFVs [] decls + where + -- Fixity decls 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' (d:ds) = rnDecl d `thenRn` \(d', fvs') -> + go (fvs `plusFV` fvs') (d':ds') ds + +rnIfaceDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl +rnIfaceDecl d + = rnDecl d `thenRn` \ (d', fvs) -> + returnRn d' +\end{code} - rnExports (mod:imp_mods) exports `thenRn` \ exported_fn -> - rnFixes fixes `thenRn` \ src_fixes -> - let - pair_name inf@(InfixL n _) = (n, inf) - pair_name inf@(InfixR n _) = (n, inf) - pair_name inf@(InfixN n _) = (n, inf) - imp_fixes_fm = listToUFM (map pair_name (bagToList imp_fixes)) - all_fixes_fm = addListToUFM imp_fixes_fm (map pair_name src_fixes) - 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 src_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 - ) +%********************************************************* +%* * +\subsection{Value declarations} +%* * +%********************************************************* + +\begin{code} +-- rnDecl does all the work +rnDecl :: RdrNameHsDecl -> RnMS s (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 $ + lookupBndrRn name `thenRn` \ name' -> + rnIfaceType doc_str ty `thenRn` \ ty' -> + + -- Get the pragma info (if any). + setModeRn (InterfaceMode Optional) $ + -- In all the rest of the signature we read in optional mode, + -- so that (a) we don't die + mapRn rnIdInfo id_infos `thenRn` \ id_infos' -> + returnRn (SigD (IfaceSig name' ty' id_infos' loc), emptyFVs) + -- Don't need free-var info for iface binds where - trashed_exports = trace "rnSource:trashed_exports" Nothing - trashed_imports = trace "rnSource:trashed_imports" [] + doc_str = text "the interface signature for" <+> quotes (ppr name) \end{code} %********************************************************* @@ -118,391 +146,708 @@ 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 derivings pragmas src_loc)) = pushSrcLocRn src_loc $ - lookupTyCon tycon `thenRn` \ tycon' -> - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env, tyvars') -> - rnContext tv_env context `thenRn` \ context' -> - rnConDecls tv_env condecls `thenRn` \ condecls' -> - rn_derivs tycon' src_loc derivings `thenRn` \ derivings' -> + lookupBndrRn tycon `thenRn` \ tycon' -> + bindTyVarsFVRn data_doc tyvars $ \ tyvars' -> + rnContext data_doc context `thenRn` \ (context', cxt_fvs) -> + checkDupOrQualNames data_doc con_names `thenRn_` + mapAndUnzipRn rnConDecl condecls `thenRn` \ (condecls', con_fvs_s) -> + 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' derivings' noDataPragmas src_loc), + cxt_fvs `plusFV` plusFVs con_fvs_s `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 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) + lookupBndrRn name `thenRn` \ name' -> + bindTyVarsFVRn syn_doc tyvars $ \ tyvars' -> + rnHsType syn_doc 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) +rnDecl (TyClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname 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 + lookupBndrRn 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 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 + newImportedGlobalFromRdrName tname `thenRn` \ tname' -> + newImportedGlobalFromRdrName dname `thenRn` \ dname' -> -@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. + -- Tyvars scope over bindings and context + bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' -> -\begin{code} -rnConDecls :: TyVarNamesEnv - -> [RdrNameConDecl] - -> RnM_Fixes s [RenamedConDecl] + -- Check the superclasses + rnContext cls_doc context `thenRn` \ (context', cxt_fvs) -> + + -- Check the signatures + let + -- First process the class op sigs, then the fixity sigs. + (op_sigs, non_op_sigs) = partition isClassOpSig sigs + (fix_sigs, non_sigs) = partition isFixitySig non_op_sigs + in + checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_` + mapAndUnzipRn (rn_op cname' clas_tyvar_names) op_sigs `thenRn` \ (sigs', sig_fvs_s) -> + mapRn_ (unknownSigErr) non_sigs `thenRn_` + let + binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ] + in + renameSigs False binders lookupOccRn fix_sigs `thenRn` \ (fixs', fix_fvs) -> -rnConDecls tv_env con_decls - = mapRn rn_decl con_decls + -- Check the methods + checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_` + rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) -> + + -- 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' (fixs' ++ sigs') mbinds' NoClassPragmas tname' dname' src_loc), + plusFVs sig_fvs_s `plusFV` + fix_fvs `plusFV` + cxt_fvs `plusFV` + meth_fvs + ) + ) where - rn_decl (ConDecl name tys src_loc) - = pushSrcLocRn src_loc $ - lookupValue 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 $ - lookupValue 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 $ - lookupValue name `thenRn` \ new_name -> - rn_mono_ty ty `thenRn` \ new_ty -> - returnRn (NewConDecl new_name new_ty src_loc) - - rn_decl (RecConDecl con fields src_loc) - = panic "rnConDecls:RecConDecl" - - ---------- - rn_mono_ty = rnMonoType tv_env - - rn_bang_ty (Banged ty) - = rn_mono_ty ty `thenRn` \ new_ty -> - returnRn (Banged new_ty) - rn_bang_ty (Unbanged ty) - = rn_mono_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 + + sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs] + meth_rdr_names_w_locs = bagToList (collectMonoBinders mbinds) + meth_rdr_names = map fst meth_rdr_names_w_locs + + rn_op clas clas_tyvars sig@(ClassOpSig op maybe_dm ty locn) + = pushSrcLocRn locn $ + lookupBndrRn 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` op_ty_fvs) + (classTyVarNotInOpTyErr clas_tyvar sig) + in + mapRn_ check_in_op_ty clas_tyvars `thenRn_` + + -- Make the default-method name + let + dm_occ = mkDefaultMethodOcc (rdrNameOcc op) + in + getModuleRn `thenRn` \ mod_name -> + getModeRn `thenRn` \ mode -> + (case (mode, maybe_dm) of + (SourceMode, _) | op `elem` meth_rdr_names + -> -- There's an explicit method decl + newLocallyDefinedGlobalName mod_name dm_occ + (\_ -> Exported) locn `thenRn` \ dm_name -> + returnRn (Just dm_name) + + (InterfaceMode _, Just _) + -> -- Imported class that has a default method decl + newImportedGlobalName mod_name dm_occ `thenRn` \ dm_name -> + addOccurrenceName dm_name `thenRn_` + returnRn (Just dm_name) + + other -> returnRn Nothing + ) `thenRn` \ maybe_dm_name -> + + + returnRn (ClassOpSig op_name maybe_dm_name new_ty locn, op_ty_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 src_loc)) = pushSrcLocRn src_loc $ + rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) -> let - tyvars = extractMonoTyNames 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) + extendTyVarEnvFVRn inst_tyvars $ + + -- Rename the bindings + -- NB meth_names can be qualified! + checkDupNames meth_doc meth_names `thenRn_` + rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) -> + let + binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds'))) + + -- Delete sigs (&report) sigs that aren't allowed inside an + -- instance decl: + -- + -- + type signatures + -- + fixity decls + -- + (ok_sigs, not_ok_idecl_sigs) = partition okInInstDecl uprags + + okInInstDecl (FixSig _) = False + okInInstDecl (Sig _ _ _) = False + okInInstDecl _ = True + + in + -- You can't have fixity decls & type signatures + -- within an instance declaration. + mapRn_ unknownSigErr not_ok_idecl_sigs `thenRn_` + renameSigs False binders lookupOccRn ok_sigs `thenRn` \ (new_uprags, prag_fvs) -> + mkDFunName inst_ty' maybe_dfun src_loc `thenRn` \ dfun_name -> + addOccurrenceName dfun_name `thenRn_` + -- The dfun is not optional, because we use its version number + -- to identify the version of the instance declaration + + -- The typechecker checks that all the bindings are for the right class. + returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags (Just dfun_name) src_loc), + inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs) + where + meth_doc = text "the bindings in an instance declaration" + meth_names = bagToList (collectMonoBinders 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 context `thenRn` \ context' -> - lookupClass cname `thenRn` \ cname' -> - mapRn (rn_op cname' 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) -> + lookupImplicitOccRn numClass_RDR `thenRn_` + returnRn (DefD (DefaultDecl tys' src_loc), fvs) where - rn_op clas tv_env (ClassOpSig op ty pragmas locn) - = pushSrcLocRn locn $ - lookupClassOp clas op `thenRn` \ op_name -> - rnPolyType tv_env ty `thenRn` \ new_ty -> - -{- -*** Please check here that tyvar' appears in new_ty *** -*** (used to be in tcClassSig, but it's better here) -*** not_elem = isn'tIn "tcClassSigs" -*** -- Check that the class type variable is mentioned -*** checkTc (clas_tyvar `not_elem` extractTyVarTemplatesFromTy local_ty) -*** (methodTypeLacksTyVarErr clas_tyvar (_UNPK_ op_name) src_loc) `thenTc_` --} - - 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} %* * %********************************************************* +\begin{code} +rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) + = pushSrcLocRn src_loc $ + lookupBndrRn name `thenRn` \ name' -> + (case imp_exp of + FoImport _ | not isDyn -> addImplicitOccRn name' + FoLabel -> addImplicitOccRn name' + FoExport | isDyn -> + addImplicitOccRn makeStablePtr_NAME `thenRn_` + addImplicitOccRn deRefStablePtr_NAME `thenRn_` + addImplicitOccRn bindIO_NAME `thenRn_` + returnRn name' + _ -> returnRn name') `thenRn_` + rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs) -> + returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc), fvs) + where + fo_decl_msg = ptext SLIT("a foreign declaration") + isDyn = isDynamic ext_nm -@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. +\end{code} + +%********************************************************* +%* * +\subsection{Support code for type/data declarations} +%* * +%********************************************************* \begin{code} -rnInstDecl :: RdrNameInstDecl -> RnM_Fixes s RenamedInstDecl +rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name], FreeVars) -rnInstDecl (InstDecl cname ty mbinds from_here modname uprags pragmas src_loc) - = pushSrcLocRn src_loc $ - lookupClass cname `thenRn` \ cname' -> +rnDerivs Nothing -- derivs not specified + = returnRn (Nothing, emptyFVs) - rnPolyType [] ty `thenRn` \ ty' -> - -- [] tv_env ensures that tyvars will be foralled +rnDerivs (Just ds) + = mapRn rn_deriv ds `thenRn` \ derivs -> + returnRn (Just derivs, foldl addOneFV emptyFVs derivs) + where + rn_deriv clas + = lookupOccRn clas `thenRn` \ clas_name -> + + -- Now add extra "occurrences" for things that + -- the deriving mechanism will later need in order to + -- generate code for this class. + case lookupUFM derivingOccurrences clas_name of + Nothing -> addErrRn (derivingNonStdClassErr clas_name) `thenRn_` + returnRn clas_name - rnMethodBinds cname' mbinds `thenRn` \ mbinds' -> - mapRn (rn_uprag cname') uprags `thenRn` \ new_uprags -> + Just occs -> mapRn_ lookupImplicitOccRn occs `thenRn_` + returnRn clas_name + +\end{code} - ASSERT(isNoInstancePragmas pragmas) - returnRn (InstDecl cname' ty' mbinds' - from_here modname new_uprags noInstancePragmas src_loc) +\begin{code} +conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) +conDeclName (ConDecl n _ _ _ l) = (n,l) + +rnConDecl :: RdrNameConDecl -> RnMS s (RenamedConDecl, FreeVars) +rnConDecl (ConDecl name tvs cxt details locn) + = pushSrcLocRn locn $ + checkConName name `thenRn_` + lookupBndrRn name `thenRn` \ new_name -> + 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_tyvars new_context new_details locn, + cxt_fvs `plusFV` det_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) + doc = text "the definition of data constructor" <+> quotes (ppr name) - rn_uprag class_name (DeforestSig op locn) - = pushSrcLocRn locn $ - lookupClassOp class_name op `thenRn` \ op_name -> - returnRn (DeforestSig op_name locn) +rnConDetails doc locn (VanillaCon tys) + = mapAndUnzipRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs_s) -> + returnRn (VanillaCon new_tys, plusFVs fvs_s) - 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) +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 (NewCon ty mb_field) + = rnHsType doc ty `thenRn` \ (new_ty, fvs) -> + rn_field mb_field `thenRn` \ new_mb_field -> + returnRn (NewCon new_ty new_mb_field, fvs) + where + rn_field Nothing = returnRn Nothing + rn_field (Just f) = + lookupBndrRn f `thenRn` \ new_f -> + returnRn (Just new_f) + +rnConDetails doc locn (RecCon fields) + = checkDupOrQualNames doc field_names `thenRn_` + mapAndUnzipRn (rnField doc) fields `thenRn` \ (new_fields, fvs_s) -> + returnRn (RecCon new_fields, plusFVs fvs_s) + where + field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] + +rnField doc (names, ty) + = mapRn lookupBndrRn 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{@SPECIALIZE instance@ user-pragmas} +\subsection{Naming a dfun} %* * %********************************************************* +Make a name for the dict fun for an instance decl + \begin{code} -rnSpecInstSig :: RdrNameSpecInstSig - -> RnM_Fixes s RenamedSpecInstSig +mkDFunName :: RenamedHsType -- Instance type + -> Maybe RdrName -- Dfun thing from decl; Nothing <=> source + -> SrcLoc + -> RnMS s Name -rnSpecInstSig (SpecInstSig clas ty src_loc) - = pushSrcLocRn src_loc $ - let - tyvars = extractMonoTyNames 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) +mkDFunName inst_ty maybe_df src_loc + = newDFunName cl_occ tycon_occ maybe_df src_loc + where + (cl_occ, tycon_occ) = get_key inst_ty + + get_key (HsForAllTy _ _ ty) = get_key ty + get_key (MonoFunTy _ ty) = get_key ty + get_key (MonoDictTy cls (ty:_)) = (nameOccName cls, get_tycon_key ty) + + get_tycon_key (MonoTyVar tv) = nameOccName (getName tv) + get_tycon_key (MonoTyApp ty _) = get_tycon_key ty + get_tycon_key (MonoTupleTy tys True) = getOccName (tupleTyCon (length tys)) + get_tycon_key (MonoTupleTy tys False) = getOccName (unboxedTupleTyCon (length tys)) + get_tycon_key (MonoListTy _) = getOccName listTyCon + get_tycon_key (MonoFunTy _ _) = getOccName funTyCon \end{code} + %********************************************************* %* * -\subsection{Default declarations} +\subsection{Support code to rename types} %* * %********************************************************* -@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] +rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s (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 + +rnIfaceType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType +rnIfaceType doc ty + = rnHsType doc ty `thenRn` \ (ty,_) -> + returnRn ty + + +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 new_tyvars new_ctxt new_ty, + cxt_fvs `plusFV` ty_fvs) + +-- Check that each constraint mentions at least one of the forall'd type variables +-- Since the forall'd type variables are a subset of the free tyvars +-- of the tau-type part, this guarantees that every constraint mentions +-- at least one of the free tyvars in ty +checkConstraints explicit_forall doc forall_tyvars ctxt ty + = mapRn check ctxt `thenRn` \ maybe_ctxt' -> + returnRn (catMaybes maybe_ctxt') + -- Remove problem ones, to avoid duplicate error message. + where + check ct@(_,tys) + | forall_mentioned = returnRn (Just ct) + | otherwise = addErrRn (ctxtErr explicit_forall doc forall_tyvars ct ty) `thenRn_` + returnRn Nothing + where + forall_mentioned = foldr ((||) . any (`elem` forall_tyvars) . extractHsTyVars) + False + tys + + +rnHsType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars) + +rnHsType doc (HsForAllTy Nothing ctxt ty) + -- From 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_tyvars = extractHsTyVars ty + forall_tyvars = filter (not . (`elemFM` name_env)) mentioned_tyvars + in + checkConstraints False doc forall_tyvars ctxt ty `thenRn` \ ctxt' -> + rnForAll doc (map UserTyVar forall_tyvars) ctxt' ty + +rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt ty) + -- Explicit quantification. + -- Check that the forall'd tyvars are a subset of the + -- free tyvars in the tau-type part + -- That's only a warning... unless the tyvar is constrained by a + -- context in which case it's an error + = let + mentioned_tyvars = extractHsTyVars ty + constrained_tyvars = [tv | (_,tys) <- ctxt, + ty <- tys, + tv <- extractHsTyVars ty] + dubious_guys = filter (`notElem` mentioned_tyvars) forall_tyvar_names + (bad_guys, warn_guys) = partition (`elem` constrained_tyvars) dubious_guys + forall_tyvar_names = map getTyVarName forall_tyvars + in + mapRn_ (forAllErr doc ty) bad_guys `thenRn_` + mapRn_ (forAllWarn doc ty) warn_guys `thenRn_` + checkConstraints True doc forall_tyvar_names ctxt ty `thenRn` \ ctxt' -> + rnForAll doc forall_tyvars ctxt' ty + +rnHsType doc (MonoTyVar tyvar) + = lookupOccRn tyvar `thenRn` \ tyvar' -> + returnRn (MonoTyVar tyvar', unitFV tyvar') + +rnHsType doc (MonoFunTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> + rnHsType doc ty2 `thenRn` \ (ty2', fvs2) -> + returnRn (MonoFunTy ty1' ty2', fvs1 `plusFV` fvs2) + +rnHsType doc (MonoListTy ty) + = addImplicitOccRn listTyCon_name `thenRn_` + rnHsType doc ty `thenRn` \ (ty', fvs) -> + returnRn (MonoListTy ty', fvs `addOneFV` listTyCon_name) + +rnHsType doc (MonoTupleTy tys boxed) + = addImplicitOccRn tup_con_name `thenRn_` + rnHsTypes doc tys `thenRn` \ (tys', fvs) -> + returnRn (MonoTupleTy tys' boxed, fvs `addOneFV` tup_con_name) + where + tup_con_name = tupleTyCon_name boxed (length tys) -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] +rnHsType doc (MonoTyApp ty1 ty2) + = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> + rnHsType doc ty2 `thenRn` \ (ty2', fvs2) -> + returnRn (MonoTyApp ty1' ty2', fvs1 `plusFV` fvs2) + +rnHsType doc (MonoDictTy clas tys) + = lookupOccRn clas `thenRn` \ clas' -> + rnHsTypes doc tys `thenRn` \ (tys', fvs) -> + returnRn (MonoDictTy clas' tys', fvs `addOneFV` clas') + +rnHsTypes doc tys + = mapAndUnzipRn (rnHsType doc) tys `thenRn` \ (tys, fvs_s) -> + returnRn (tys, plusFVs fvs_s) \end{code} -%************************************************************************* -%* * -\subsection{Fixity declarations} -%* * -%************************************************************************* \begin{code} -rnFixes :: [RdrNameFixityDecl] -> RnM s [RenamedFixityDecl] +rnContext :: SDoc -> RdrNameContext -> RnMS s (RenamedContext, FreeVars) + +rnContext doc ctxt + = mapAndUnzipRn rn_ctxt ctxt `thenRn` \ (theta, fvs_s) -> + let + (_, dup_asserts) = removeDups cmp_assert theta + in + -- Check for duplicate assertions + -- If this isn't an error, then it ought to be: + mapRn_ (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_` -rnFixes fixities - = mapRn rn_fixity fixities `thenRn` \ fixes_maybe -> - returnRn (catMaybes fixes_maybe) + returnRn (theta, plusFVs fvs_s) where - 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 - = lookupValueMaybe name `thenRn` \ maybe_res -> - case maybe_res of - Just res | isLocallyDefined res - -> returnRn (Just (mk_fixity res i)) - _ -> failButContinueRn Nothing (undefinedFixityDeclErr fix) - + rn_ctxt (clas, tys) + = lookupOccRn clas `thenRn` \ clas_name -> + rnHsTypes doc tys `thenRn` \ (tys', fvs) -> + returnRn ((clas_name, tys'), fvs `addOneFV` clas_name) + + cmp_assert (c1,tys1) (c2,tys2) + = (c1 `compare` c2) `thenCmp` (cmpHsTypes compare tys1 tys2) \end{code} + %********************************************************* %* * -\subsection{Support code to rename types} +\subsection{IdInfo} %* * %********************************************************* \begin{code} -rnPolyType :: TyVarNamesEnv - -> RdrNamePolyType - -> RnM_Fixes s RenamedPolyType +rnIdInfo (HsStrictness str) = returnRn (HsStrictness str) + +rnIdInfo (HsWorker worker cons) + -- The sole purpose of the "cons" field is so that we can mark the + -- constructors needed to build the wrapper as "needed", so that their + -- data type decl will be slurped in. After that their usefulness is + -- o'er, so we just put in the empty list. + = lookupOccRn worker `thenRn` \ worker' -> + mapRn lookupOccRn cons `thenRn_` + returnRn (HsWorker worker' []) + +rnIdInfo (HsUnfold inline (Just expr)) = rnCoreExpr expr `thenRn` \ expr' -> + returnRn (HsUnfold inline (Just expr')) +rnIdInfo (HsUnfold inline Nothing) = returnRn (HsUnfold inline Nothing) +rnIdInfo (HsArity arity) = returnRn (HsArity arity) +rnIdInfo (HsUpdate update) = returnRn (HsUpdate update) +rnIdInfo (HsNoCafRefs) = returnRn (HsNoCafRefs) +rnIdInfo (HsCprInfo cpr_info) = returnRn (HsCprInfo cpr_info) +rnIdInfo (HsSpecialise tyvars tys expr) + = bindTyVarsRn doc tyvars $ \ tyvars' -> + rnCoreExpr expr `thenRn` \ expr' -> + mapRn (rnIfaceType doc) tys `thenRn` \ tys' -> + returnRn (HsSpecialise tyvars' tys' expr') + where + doc = text "Specialise in interface pragma" +\end{code} -rnPolyType tv_env (HsForAllTy tvs ctxt ty) - = rn_poly_help tv_env tvs ctxt ty +UfCore expressions. -rnPolyType tv_env poly_ty@(HsPreForAllTy ctxt ty) - = rn_poly_help tv_env forall_tyvars ctxt ty +\begin{code} +rnCoreExpr (UfType ty) + = rnIfaceType (text "unfolding type") ty `thenRn` \ ty' -> + returnRn (UfType ty') + +rnCoreExpr (UfVar v) + = lookupOccRn v `thenRn` \ v' -> + returnRn (UfVar v') + +rnCoreExpr (UfCon con args) + = rnUfCon con `thenRn` \ con' -> + mapRn rnCoreExpr args `thenRn` \ args' -> + returnRn (UfCon con' args') + +rnCoreExpr (UfTuple con args) + = lookupOccRn con `thenRn` \ con' -> + mapRn rnCoreExpr args `thenRn` \ args' -> + returnRn (UfTuple con' args') + +rnCoreExpr (UfApp fun arg) + = rnCoreExpr fun `thenRn` \ fun' -> + rnCoreExpr arg `thenRn` \ arg' -> + returnRn (UfApp fun' arg') + +rnCoreExpr (UfCase scrut bndr alts) + = rnCoreExpr scrut `thenRn` \ scrut' -> + bindLocalsRn "a UfCase" [bndr] $ \ [bndr'] -> + mapRn rnCoreAlt alts `thenRn` \ alts' -> + returnRn (UfCase scrut' bndr' alts') + +rnCoreExpr (UfNote note expr) + = rnNote note `thenRn` \ note' -> + rnCoreExpr expr `thenRn` \ expr' -> + returnRn (UfNote note' expr') + +rnCoreExpr (UfLam bndr body) + = rnCoreBndr bndr $ \ bndr' -> + rnCoreExpr body `thenRn` \ body' -> + returnRn (UfLam bndr' body') + +rnCoreExpr (UfLet (UfNonRec bndr rhs) body) + = rnCoreExpr rhs `thenRn` \ rhs' -> + rnCoreBndr bndr $ \ bndr' -> + rnCoreExpr body `thenRn` \ body' -> + returnRn (UfLet (UfNonRec bndr' rhs') body') + +rnCoreExpr (UfLet (UfRec pairs) body) + = rnCoreBndrs bndrs $ \ bndrs' -> + mapRn rnCoreExpr rhss `thenRn` \ rhss' -> + rnCoreExpr body `thenRn` \ body' -> + returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body') where - mentioned_tyvars = extract_poly_ty_names poly_ty - forall_tyvars = mentioned_tyvars `minusList` domTyVarNamesEnv tv_env - ------------- -extract_poly_ty_names (HsPreForAllTy ctxt ty) - = extractCtxtTyNames ctxt - `unionLists` - extractMonoTyNames ty - ------------- -rn_poly_help :: TyVarNamesEnv - -> [RdrName] - -> RdrNameContext - -> RdrNameMonoType - -> RnM_Fixes s RenamedPolyType - -rn_poly_help tv_env tyvars ctxt 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 ctxt `thenRn` \ new_ctxt -> - rnMonoType tv_env2 ty `thenRn` \ new_ty -> - returnRn (HsForAllTy new_tyvars new_ctxt new_ty) + (bndrs, rhss) = unzip pairs \end{code} \begin{code} -rnMonoType :: TyVarNamesEnv - -> RdrNameMonoType - -> RnM_Fixes s RenamedMonoType +rnCoreBndr (UfValBinder name ty) thing_inside + = rnIfaceType (text str) ty `thenRn` \ ty' -> + bindLocalsRn str [name] $ \ [name'] -> + thing_inside (UfValBinder name' ty') + where + str = "unfolding id" + +rnCoreBndr (UfTyBinder name kind) thing_inside + = bindLocalsRn "an unfolding tyvar" [name] $ \ [name'] -> + thing_inside (UfTyBinder name' kind) + +rnCoreBndrs bndrs thing_inside -- Expect them all to be ValBinders + = mapRn (rnIfaceType (text str)) tys `thenRn` \ tys' -> + bindLocalsRn str names $ \ names' -> + thing_inside (zipWith UfValBinder names' tys') + where + str = "unfolding id" + names = map (\ (UfValBinder name _ ) -> name) bndrs + tys = map (\ (UfValBinder _ ty) -> ty) bndrs +\end{code} -rnMonoType tv_env (MonoTyVar tyvar) - = lookupTyVarName tv_env tyvar `thenRn` \ tyvar' -> - returnRn (MonoTyVar tyvar') +\begin{code} +rnCoreAlt (con, bndrs, rhs) + = rnUfCon con `thenRn` \ con' -> + bindLocalsRn "an unfolding alt" bndrs $ \ bndrs' -> + rnCoreExpr rhs `thenRn` \ rhs' -> + returnRn (con', bndrs', rhs') -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) +rnNote (UfCoerce ty) + = rnIfaceType (text "unfolding coerce") ty `thenRn` \ ty' -> + returnRn (UfCoerce ty') -rnMonoType tv_env (MonoTupleTy tys) - = mapRn (rnMonoType tv_env) tys `thenRn` \ tys' -> - returnRn (MonoTupleTy tys') +rnNote (UfSCC cc) = returnRn (UfSCC cc) +rnNote UfInlineCall = returnRn UfInlineCall -rnMonoType tv_env (MonoTyApp name tys) - = let - lookup_fn = if isAvarid (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} -\begin{code} -rnContext :: TyVarNamesEnv -> RdrNameContext -> RnM_Fixes s RenamedContext +rnUfCon UfDefault + = returnRn UfDefault -rnContext tv_env ctxt - = mapRn rn_ctxt ctxt - where - rn_ctxt (clas, tyvar) - = lookupClass clas `thenRn` \ clas_name -> - lookupTyVarName tv_env tyvar `thenRn` \ tyvar_name -> - returnRn (clas_name, tyvar_name) -\end{code} +rnUfCon (UfDataCon con) + = lookupOccRn con `thenRn` \ con' -> + returnRn (UfDataCon con') +rnUfCon (UfLitCon lit) + = returnRn (UfLitCon lit) -\begin{code} -derivingNonStdClassErr clas locn sty - = ppHang (ppStr "Non-standard class in deriving") - 4 (ppCat [ppr sty clas, ppr sty locn]) +rnUfCon (UfLitLitCon lit ty) + = rnIfaceType (text "litlit") ty `thenRn` \ ty' -> + returnRn (UfLitLitCon lit ty') -dupDefaultDeclErr defs sty - = ppHang (ppStr "Duplicate default declarations") - 4 (ppAboves (map pp_def_loc defs)) - where - pp_def_loc (DefaultDecl _ src_loc) = ppr sty src_loc +rnUfCon (UfPrimOp op) + = lookupOccRn op `thenRn` \ op' -> + returnRn (UfPrimOp op') -undefinedFixityDeclErr decl sty - = ppHang (ppStr "Fixity declaration for unknown operator") - 4 (ppr sty decl) +rnUfCon (UfCCallOp str is_dyn casm gc) + = returnRn (UfCCallOp str is_dyn casm gc) +\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) + +dupClassAssertWarn ctxt (assertion : dups) + = sep [hsep [ptext SLIT("Duplicate class assertion"), + quotes (pprClassAssertion assertion), + ptext SLIT("in the context:")], + nest 4 (pprContext ctxt <+> ptext SLIT("..."))] + +badDataCon name + = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] + +forAllWarn doc ty tyvar + | not opt_WarnUnusedMatches = returnRn () + | otherwise + = 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))] + $$ + (ptext SLIT("In") <+> doc)) + +forAllErr doc ty tyvar + = addErrRn ( + sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar), + nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] + $$ + (ptext SLIT("In") <+> doc)) + +ctxtErr explicit_forall doc tyvars constraint ty + = sep [ptext SLIT("The constraint") <+> quotes (pprClassAssertion constraint) <+> + ptext SLIT("does not mention any of"), + if explicit_forall then + nest 4 (ptext SLIT("the universally quantified type variables") <+> braces (interpp'SP tyvars)) + else + nest 4 (ptext SLIT("the type variables in the type") <+> quotes (ppr ty)) + ] + $$ + (ptext SLIT("In") <+> doc) \end{code}