X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=b0d5e4669d55b7bb70b81b52d61daf02ccaae728;hb=9bedea20f62a1da832c69833c39dd1d15e6ee9a3;hp=60615a9769a20842d56ff58a278847e90db60d9f;hpb=b610eca3e4405e185bab53204cf2829893ada268;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 60615a9..b0d5e46 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -11,55 +11,47 @@ module RnSource ( rnDecl, rnSourceDecls, rnHsType, rnHsSigType ) where import RnExpr import HsSyn import HsPragmas -import HsTypes ( getTyVarName ) -import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, isRdrTyVar, mkRdrNameWkr ) +import HsTypes ( hsTyVarNames, pprHsContext ) +import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, mkRdrNameWkr ) import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, extractRuleBndrsTyVars, extractHsTyRdrTyVars, - extractHsTysRdrTyVars, extractHsCtxtRdrTyVars + extractHsCtxtRdrTyVars, extractGenericPatTyVars ) import RnHsSyn import HsCore -import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr ) -import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, getIPName, - lookupImplicitOccRn, lookupImplicitOccsRn, - bindLocalsRn, bindLocalRn, bindLocalsFVRn, bindUVarRn, +import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs ) +import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName, + lookupOrigNames, lookupSysBinder, newLocalsRn, + bindLocalsFVRn, bindUVarRn, bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn, - bindCoreLocalFVRn, bindCoreLocalsFVRn, + bindCoreLocalFVRn, bindCoreLocalsFVRn, bindLocalNames, checkDupOrQualNames, checkDupNames, - mkImportedGlobalName, mkImportedGlobalFromRdrName, - newDFunName, getDFunKey, newImplicitBinder, FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV, mapFvRn ) import RnMonad import FunDeps ( oclose ) -import Class ( FunDep ) - -import Name ( Name, OccName, - ExportFlag(..), Provenance(..), - nameOccName, NamedThing(..) - ) +import Class ( FunDep, DefMeth (..) ) +import Name ( Name, OccName, nameOccName, NamedThing(..) ) import NameSet -import OccName ( mkDefaultMethodOcc ) -import BasicTypes ( TopLevelFlag(..) ) +import OccName ( mkDefaultMethodOcc, isTvOcc ) import FiniteMap ( elemFM ) -import PrelInfo ( derivableClassKeys, cCallishClassKeys, - deRefStablePtr_RDR, makeStablePtr_RDR, +import PrelInfo ( derivableClassKeys, cCallishClassKeys ) +import PrelNames ( deRefStablePtr_RDR, makeStablePtr_RDR, bindIO_RDR, returnIO_RDR ) import Bag ( bagToList ) import List ( partition, nub ) import Outputable import SrcLoc ( SrcLoc ) -import CmdLineOpts ( opt_GlasgowExts, opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars +import CmdLineOpts ( DynFlags, DynFlag(..) ) + -- Warn of unused for-all'd tyvars import Unique ( Uniquable(..) ) -import UniqFM ( lookupUFM ) import ErrUtils ( Message ) import CStrings ( isCLabelString ) -import Maybes ( maybeToBool, catMaybes ) -import Util +import ListSetOps ( minusList, removeDupsEq ) \end{code} @rnDecl@ `renames' declarations. @@ -116,7 +108,7 @@ rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> rnDecl (SigD (IfaceSig name ty id_infos loc)) = pushSrcLocRn loc $ - mkImportedGlobalFromRdrName name `thenRn` \ name' -> + lookupTopBndrRn name `thenRn` \ name' -> rnHsType doc_str ty `thenRn` \ (ty',fvs1) -> mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) -> returnRn (SigD (IfaceSig name' ty' id_infos' loc), fvs1 `plusFV` fvs2) @@ -144,17 +136,19 @@ and then go over it again to rename the tyvars! However, we can also do some scoping checks at the same time. \begin{code} -rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls nconstrs derivings pragmas src_loc)) +rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls nconstrs derivings pragmas src_loc gen_name1 gen_name2)) = pushSrcLocRn src_loc $ - lookupBndrRn tycon `thenRn` \ tycon' -> + lookupTopBndrRn tycon `thenRn` \ tycon' -> bindTyVarsFVRn data_doc tyvars $ \ tyvars' -> rnContext data_doc context `thenRn` \ (context', cxt_fvs) -> checkDupOrQualNames data_doc con_names `thenRn_` mapFvRn rnConDecl condecls `thenRn` \ (condecls', con_fvs) -> + lookupSysBinder gen_name1 `thenRn` \ name1' -> + lookupSysBinder gen_name2 `thenRn` \ name2' -> rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) -> ASSERT(isNoDataPragmas pragmas) returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' nconstrs - derivings' noDataPragmas src_loc), + derivings' noDataPragmas src_loc name1' name2'), cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs) where data_doc = text "the data type declaration for" <+> quotes (ppr tycon) @@ -162,23 +156,24 @@ rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls nconstrs derivin rnDecl (TyClD (TySynonym name tyvars ty src_loc)) = pushSrcLocRn src_loc $ - lookupBndrRn name `thenRn` \ name' -> + doptRn Opt_GlasgowExts `thenRn` \ glaExts -> + lookupTopBndrRn name `thenRn` \ name' -> bindTyVarsFVRn syn_doc tyvars $ \ tyvars' -> - rnHsType syn_doc (unquantify ty) `thenRn` \ (ty', ty_fvs) -> + rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ (ty', ty_fvs) -> returnRn (TyClD (TySynonym name' tyvars' ty' src_loc), ty_fvs) where syn_doc = text "the declaration for type synonym" <+> quotes (ppr name) -- For H98 we do *not* universally quantify on the RHS of a synonym -- Silently discard context... but the tyvars in the rest won't be in scope - unquantify (HsForAllTy Nothing ctxt ty) | not opt_GlasgowExts = ty - unquantify ty = ty + unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty + unquantify glaExys ty = ty rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas - tname dname dwname snames src_loc)) + names src_loc)) = pushSrcLocRn src_loc $ - lookupBndrRn cname `thenRn` \ cname' -> + lookupTopBndrRn cname `thenRn` \ cname' -> -- Deal with the implicit tycon and datacon name -- They aren't in scope (because they aren't visible to the user) @@ -187,10 +182,8 @@ rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas -- 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 - mkImportedGlobalFromRdrName tname `thenRn` \ tname' -> - mkImportedGlobalFromRdrName dname `thenRn` \ dname' -> - mkImportedGlobalFromRdrName dwname `thenRn` \ dwname' -> - mapRn mkImportedGlobalFromRdrName snames `thenRn` \ snames' -> + + mapRn lookupSysBinder names `thenRn` \ names' -> -- Tyvars scope over bindings and context bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' -> @@ -199,24 +192,40 @@ rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas rnContext cls_doc context `thenRn` \ (context', cxt_fvs) -> -- Check the functional dependencies - rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) -> + rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) -> -- Check the signatures + -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs). let - -- First process the class op sigs, then the fixity sigs. - (op_sigs, non_op_sigs) = partition isClassOpSig sigs + (op_sigs, non_op_sigs) = partition isClassOpSig sigs + sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs] in checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_` mapFvRn (rn_op cname' clas_tyvar_names fds') op_sigs `thenRn` \ (sigs', sig_fvs) -> let - binders = mkNameSet [ nm | (ClassOpSig nm _ _ _ _) <- sigs' ] + binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ] in renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ (non_ops', fix_fvs) -> -- Check the methods + -- The newLocals call is tiresome: given a generic class decl + -- class C a where + -- op :: a -> a + -- op {| x+y |} (Inl a) = ... + -- op {| x+y |} (Inr b) = ... + -- op {| a*b |} (a*b) = ... + -- we want to name both "x" tyvars with the same unique, so that they are + -- easy to group together in the typechecker. + -- Hence the + getLocalNameEnv `thenRn` \ name_env -> + let + meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds + gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds, + not (tv `elemFM` name_env)] + in checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_` - rnMethodBinds mbinds - `thenRn` \ (mbinds', meth_fvs) -> + newLocalsRn mkLocalName gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars -> + rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) -> -- Typechecker is responsible for checking that we only -- give default-method bindings for things in this class. @@ -225,8 +234,9 @@ rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas ASSERT(isNoClassPragmas pragmas) returnRn (TyClD (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') mbinds' - NoClassPragmas tname' dname' dwname' snames' src_loc), + NoClassPragmas names' src_loc), sig_fvs `plusFV` + fix_fvs `plusFV` cxt_fvs `plusFV` fds_fvs `plusFV` @@ -238,13 +248,9 @@ rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas 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 clas_fds sig@(ClassOpSig op dm_rdr_name explicit_dm ty locn) + rn_op clas clas_tyvars clas_fds sig@(ClassOpSig op maybe_dm_stuff ty locn) = pushSrcLocRn locn $ - lookupBndrRn op `thenRn` \ op_name -> + lookupTopBndrRn op `thenRn` \ op_name -> -- Check the signature rnHsSigType (quotes (ppr op)) ty `thenRn` \ (new_ty, op_ty_fvs) -> @@ -256,23 +262,24 @@ rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas mapRn_ check_in_op_ty clas_tyvars `thenRn_` -- Make the default-method name - getModeRn `thenRn` \ mode -> - (case mode of - SourceMode -> -- Source class decl - newImplicitBinder (mkDefaultMethodOcc (rdrNameOcc op)) locn `thenRn` \ dm_name -> - returnRn (dm_name, op `elem` meth_rdr_names, emptyFVs) + (case maybe_dm_stuff of + Nothing -> returnRn (Nothing, emptyFVs) -- Source-file class decl - InterfaceMode + Just (DefMeth dm_rdr_name) -> -- Imported class that has a default method decl -- See comments with tname, snames, above - lookupImplicitOccRn dm_rdr_name `thenRn` \ dm_name -> - returnRn (dm_name, explicit_dm, if explicit_dm then unitFV dm_name else emptyFVs) + lookupSysBinder dm_rdr_name `thenRn` \ dm_name -> + returnRn (Just (DefMeth dm_name), unitFV dm_name) -- An imported class decl for a class decl that had an explicit default -- method, mentions, rather than defines, -- the default method, so we must arrange to pull it in - ) `thenRn` \ (dm_name, final_explicit_dm, dm_fvs) -> + Just GenDefMeth + -> returnRn (Just GenDefMeth, emptyFVs) + Just NoDefMeth + -> returnRn (Just NoDefMeth, emptyFVs) + ) `thenRn` \ (maybe_dm_stuff', dm_fvs) -> - returnRn (ClassOpSig op_name dm_name final_explicit_dm new_ty locn, op_ty_fvs `plusFV` dm_fvs) + returnRn (ClassOpSig op_name maybe_dm_stuff' new_ty locn, op_ty_fvs `plusFV` dm_fvs) \end{code} @@ -283,7 +290,7 @@ rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas %********************************************************* \begin{code} -rnDecl (InstD (InstDecl inst_ty mbinds uprags dfun_rdr_name src_loc)) +rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)) = pushSrcLocRn src_loc $ rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) -> let @@ -297,35 +304,37 @@ rnDecl (InstD (InstDecl inst_ty mbinds uprags dfun_rdr_name src_loc)) -- Rename the bindings -- NB meth_names can be qualified! checkDupNames meth_doc meth_names `thenRn_` - extendTyVarEnvFVRn inst_tyvars ( - rnMethodBinds mbinds + extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) ( + rnMethodBinds [] mbinds ) `thenRn` \ (mbinds', meth_fvs) -> let - binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds'))) + binders = collectMonoBinders mbinds' + binder_set = mkNameSet binders in -- Rename the prags and signatures. -- Note that the type variables are not in scope here, -- so that instance Eq a => Eq (T a) where -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-} -- works OK. - renameSigs (okInstDclSig binders) uprags `thenRn` \ (new_uprags, prag_fvs) -> - - getModeRn `thenRn` \ mode -> - (case mode of - InterfaceMode -> lookupImplicitOccRn dfun_rdr_name `thenRn` \ dfun_name -> - returnRn (dfun_name, unitFV dfun_name) - SourceMode -> newDFunName (getDFunKey inst_ty') src_loc - `thenRn` \ dfun_name -> - returnRn (dfun_name, emptyFVs) - ) - `thenRn` \ (dfun_name, dfun_fv) -> + -- + -- But the (unqualified) method names are in scope + bindLocalNames binders ( + renameSigs (okInstDclSig binder_set) uprags + ) `thenRn` \ (new_uprags, prag_fvs) -> + + (case maybe_dfun_rdr_name of + Nothing -> returnRn (Nothing, emptyFVs) + + Just dfun_rdr_name -> lookupSysBinder dfun_rdr_name `thenRn` \ dfun_name -> + returnRn (Just dfun_name, unitFV dfun_name) + ) `thenRn` \ (maybe_dfun_name, dfun_fv) -> -- The typechecker checks that all the bindings are for the right class. - returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags dfun_name src_loc), + returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags maybe_dfun_name src_loc), inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv) where - meth_doc = text "the bindings in an instance declaration" - meth_names = bagToList (collectMonoBinders mbinds) + meth_doc = text "the bindings in an instance declaration" + meth_names = collectLocatedMonoBinders mbinds \end{code} %********************************************************* @@ -355,11 +364,10 @@ rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) lookupOccRn name `thenRn` \ name' -> let extra_fvs FoExport - | isDyn = - lookupImplicitOccsRn [makeStablePtr_RDR, deRefStablePtr_RDR, - bindIO_RDR, returnIO_RDR] - | otherwise = - lookupImplicitOccsRn [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs -> + | isDyn = lookupOrigNames [makeStablePtr_RDR, deRefStablePtr_RDR, + bindIO_RDR, returnIO_RDR] + | otherwise = + lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs -> returnRn (addOneFV fvs name') extra_fvs other = returnRn emptyFVs in @@ -462,10 +470,10 @@ conDeclName (ConDecl n _ _ _ _ l) = (n,l) rnConDecl :: RdrNameConDecl -> RnMS (RenamedConDecl, FreeVars) rnConDecl (ConDecl name wkr tvs cxt details locn) = pushSrcLocRn locn $ - checkConName name `thenRn_` - lookupBndrRn name `thenRn` \ new_name -> + checkConName name `thenRn_` + lookupTopBndrRn name `thenRn` \ new_name -> - mkImportedGlobalFromRdrName wkr `thenRn` \ new_wkr -> + lookupSysBinder wkr `thenRn` \ new_wkr -> -- See comments with ClassDecl bindTyVarsFVRn doc tvs $ \ new_tyvars -> @@ -485,16 +493,6 @@ rnConDetails doc locn (InfixCon ty1 ty2) 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_` mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) -> @@ -503,7 +501,7 @@ rnConDetails doc locn (RecCon fields) field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] rnField doc (names, ty) - = mapRn lookupBndrRn names `thenRn` \ new_names -> + = mapRn lookupTopBndrRn names `thenRn` \ new_names -> rnBangTy doc ty `thenRn` \ (new_ty, fvs) -> returnRn ((new_names, new_ty), fvs) @@ -572,18 +570,29 @@ rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau) mentioned_in_tau = extractHsTyRdrTyVars tau mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt) - forall_tyvar_names = map getTyVarName forall_tyvars + forall_tyvar_names = hsTyVarNames forall_tyvars -- Explicitly quantified but not mentioned in ctxt or tau warn_guys = filter (`notElem` mentioned) forall_tyvar_names in - mapRn_ (forAllWarn doc tau) warn_guys `thenRn_` + mapRn_ (forAllWarn doc tau) warn_guys `thenRn_` rnForAll doc forall_tyvars ctxt tau rnHsType doc (HsTyVar tyvar) = lookupOccRn tyvar `thenRn` \ tyvar' -> returnRn (HsTyVar tyvar', unitFV tyvar') +rnHsType doc (HsOpTy ty1 opname ty2) + = lookupOccRn opname `thenRn` \ name' -> + rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> + rnHsType doc ty2 `thenRn` \ (ty2',fvs2) -> + returnRn (HsOpTy ty1' name' ty2', fvs1 `plusFV` fvs2 `addOneFV` name') + +rnHsType doc (HsNumTy i) + | i == 1 = returnRn (HsNumTy i, emptyFVs) + | otherwise = failWithRn (HsNumTy i, emptyFVs) + (ptext SLIT("Only unit numeric type pattern is valid")) + rnHsType doc (HsFunTy ty1 ty2) = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) -> -- Might find a for-all as the arg of a function type @@ -653,26 +662,6 @@ rnHsTupConWkr (HsTupCon n boxity) \end{code} \begin{code} --- 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 doc forall_tyvars tau_vars ctxt ty - = mapRn (checkPred doc forall_tyvars ty) ctxt `thenRn` \ maybe_ctxt' -> - returnRn (catMaybes maybe_ctxt') - -- Remove problem ones, to avoid duplicate error message. - -checkPred doc forall_tyvars ty p@(HsPClass clas tys) - | not_univ = failWithRn Nothing (univErr doc p ty) - | otherwise = returnRn (Just p) - where - ct_vars = extractHsTysRdrTyVars tys - not_univ = -- At least one of the tyvars in each constraint must - -- be universally quantified. This restriction isn't in Hugs - not (any (`elem` forall_tyvars) ct_vars) -checkPred doc forall_tyvars ty p@(HsPIParam _ _) - = returnRn (Just p) - rnForAll doc forall_tyvars ctxt ty = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars -> rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) -> @@ -714,7 +703,7 @@ rnPred doc (HsPClass clas tys) returnRn (HsPClass clas_name tys', fvs `addOneFV` clas_name) rnPred doc (HsPIParam n ty) - = getIPName n `thenRn` \ name -> + = newIPName n `thenRn` \ name -> rnHsType doc ty `thenRn` \ (ty', fvs) -> returnRn (HsPIParam name ty', fvs) \end{code} @@ -753,7 +742,6 @@ rnIdInfo (HsWorker worker) rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ (expr', fvs) -> returnRn (HsUnfold inline expr', fvs) rnIdInfo (HsArity arity) = returnRn (HsArity arity, emptyFVs) -rnIdInfo (HsUpdate update) = returnRn (HsUpdate update, emptyFVs) rnIdInfo HsNoCafRefs = returnRn (HsNoCafRefs, emptyFVs) rnIdInfo HsCprInfo = returnRn (HsCprInfo, emptyFVs) @@ -924,39 +912,24 @@ badDataCon name = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] forAllWarn doc ty tyvar - | not opt_WarnUnusedMatches = returnRn () - | otherwise - = getModeRn `thenRn` \ mode -> - case mode of { + = doptRn Opt_WarnUnusedMatches `thenRn` \ warn_unused -> case () of + () | not warn_unused -> returnRn () + | otherwise + -> getModeRn `thenRn` \ mode -> + case mode of { #ifndef DEBUG - InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files - -- unless DEBUG is on, in which case it is slightly - -- informative. They can arise from mkRhsTyLam, -#endif -- leading to (say) f :: forall a b. [b] -> [b] - other -> - - addWarnRn ( - sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar), - nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] - $$ - (ptext SLIT("In") <+> doc)) - } - -forAllErr doc ty tyvar - = addErrRn ( - sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar), - nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] - $$ - (ptext SLIT("In") <+> doc)) - -univErr doc constraint ty - = sep [ptext SLIT("All of the type variable(s) in the constraint") - <+> quotes (ppr constraint) - <+> ptext SLIT("are already in scope"), - nest 4 (ptext SLIT("At least one must be universally quantified here")) - ] - $$ - (ptext SLIT("In") <+> doc) + InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files + -- unless DEBUG is on, in which case it is slightly + -- informative. They can arise from mkRhsTyLam, +#endif -- leading to (say) f :: forall a b. [b] -> [b] + other -> + addWarnRn ( + sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar), + nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))] + $$ + (ptext SLIT("In") <+> doc) + ) + } badRuleLhsErr name lhs = sep [ptext SLIT("Rule") <+> ptext name <> colon, @@ -977,7 +950,7 @@ dupClassAssertWarn ctxt (assertion : dups) = sep [hsep [ptext SLIT("Duplicate class assertion"), quotes (ppr assertion), ptext SLIT("in the context:")], - nest 4 (ppr ctxt <+> ptext SLIT("..."))] + nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))] naughtyCCallContextErr (HsPClass clas _) = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas),