TcTyClsDecls: Typecheck type and class declarations
\begin{code}
-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
module TcTyClsDecls (
tcTyAndClassDecls, tcFamInstDecl
) where
import Class
import TyCon
import DataCon
+import Id
import Var
import VarSet
import Name
import ListSetOps
import Digraph
import DynFlags
+import FastString
import Data.List
import Control.Monad ( mplus )
; checkCycleErrs decls
; mod <- getModule
; traceTc (text "tcTyAndCl" <+> ppr mod)
- ; (syn_tycons, alg_tyclss) <- fixM (\ ~(rec_syn_tycons, rec_alg_tyclss) ->
+ ; (syn_tycons, alg_tyclss) <- fixM (\ ~(_rec_syn_tycons, rec_alg_tyclss) ->
do { let { -- Seperate ordinary synonyms from all other type and
-- class declarations and add all associated type
-- declarations from type classes. The latter is
= (name, AClass cl)
mk_thing (L _ decl, ~(ATyCon tc))
= (tcdName decl, ATyCon tc)
+#if __GLASGOW_HASKELL__ < 605
+-- Old GHCs don't understand that ~... matches anything
+ mk_thing _ = panic "mkGlobalThings: Can't happen"
+#endif
\end{code}
GADTs).
\begin{code}
-tcFamInstDecl :: LTyClDecl Name -> TcM (Maybe TyThing) -- Nothing if error
+tcFamInstDecl :: LTyClDecl Name -> TcM TyThing
tcFamInstDecl (L loc decl)
= -- Prime error recovery, set source location
- recoverM (return Nothing) $
setSrcSpan loc $
tcAddDeclCtxt decl $
do { -- type families require -XTypeFamilies and can't be in an
; checkTc type_families $ badFamInstDecl (tcdLName decl)
; checkTc (not is_boot) $ badBootFamInstDeclErr
- -- perform kind and type checking
- ; tcFamInstDecl1 decl
- }
+ -- Perform kind and type checking
+ ; tc <- tcFamInstDecl1 decl
+ ; checkValidTyCon tc -- Remember to check validity;
+ -- no recursion to worry about here
+ ; return (ATyCon tc) }
-tcFamInstDecl1 :: TyClDecl Name -> TcM (Maybe TyThing) -- Nothing if error
+tcFamInstDecl1 :: TyClDecl Name -> TcM TyCon
-- "type instance"
tcFamInstDecl1 (decl@TySynonym {tcdLName = L loc tc_name})
; t_typats <- mapM tcHsKindedType k_typats
; t_rhs <- tcHsKindedType k_rhs
- -- (3) check that
- -- - check the well-formedness of the instance
+ -- (3) check the well-formedness of the instance
; checkValidTypeInst t_typats t_rhs
-- (4) construct representation tycon
; rep_tc_name <- newFamInstTyConName tc_name loc
- ; tycon <- buildSynTyCon rep_tc_name t_tvs (SynonymTyCon t_rhs)
- (Just (family, t_typats))
-
- ; return $ Just (ATyCon tycon)
+ ; buildSynTyCon rep_tc_name t_tvs (SynonymTyCon t_rhs)
+ (typeKind t_rhs) (Just (family, t_typats))
}}
-- "newtype instance" and "data instance"
-- (4) construct representation tycon
; rep_tc_name <- newFamInstTyConName tc_name loc
; let ex_ok = True -- Existentials ok for type families!
- ; tycon <- fixM (\ tycon -> do
+ ; fixM (\ tycon -> do
{ data_cons <- mapM (addLocM (tcConDecl unbox_strict ex_ok tycon t_tvs))
k_cons
; tc_rhs <-
-- dependency. (2) They are always valid loop breakers as
-- they involve a coercion.
})
-
- -- construct result
- ; return $ Just (ATyCon tycon)
}}
where
h98_syntax = case cons of -- All constructors have same shape
L _ (ConDecl { con_res = ResTyGADT _ }) : _ -> False
- other -> True
+ _ -> True
+
+tcFamInstDecl1 d = pprPanic "tcFamInstDecl1" (ppr d)
-- Kind checking of indexed types
-- -
initial kind environment. (This is handled by `allDecls').
\begin{code}
+kcTyClDecls :: [LTyClDecl Name] -> [Located (TyClDecl Name)]
+ -> TcM ([LTyClDecl Name], [Located (TyClDecl Name)])
kcTyClDecls syn_decls alg_decls
= do { -- First extend the kind env with each data type, class, and
-- indexed type, mapping them to a type variable
mk_res_kind (TyData { tcdKindSig = Just kind }) = return kind
-- On GADT-style declarations we allow a kind signature
-- data T :: *->* where { ... }
- mk_res_kind other = return liftedTypeKind
+ mk_res_kind _ = return liftedTypeKind
----------------
kcSynDecl :: SCC (LTyClDecl Name)
-> TcM (LTyClDecl Name, -- Kind-annotated decls
(Name,TcKind)) -- Kind bindings
-kcSynDecl (AcyclicSCC ldecl@(L loc decl))
+kcSynDecl (AcyclicSCC (L loc decl))
= tcAddDeclCtxt decl $
kcHsTyVars (tcdTyVars decl) (\ k_tvs ->
do { traceTc (text "kcd1" <+> ppr (unLoc (tcdLName decl)) <+> brackets (ppr (tcdTyVars decl))
= do { recSynErr decls; failM } -- Fail here to avoid error cascade
-- of out-of-scope tycons
+kindedTyVarKind :: LHsTyVarBndr Name -> Kind
kindedTyVarKind (L _ (KindedTyVar _ k)) = k
+kindedTyVarKind x = pprPanic "kindedTyVarKind" (ppr x)
------------------------------------------------------------------------
kcTyClDecl :: TyClDecl Name -> TcM (TyClDecl Name)
kcTyClDecl decl@(ClassDecl {tcdCtxt = ctxt, tcdSigs = sigs, tcdATs = ats})
= kcTyClDeclBody decl $ \ tvs' ->
- do { is_boot <- tcIsHsBoot
- ; ctxt' <- kcHsContext ctxt
+ do { ctxt' <- kcHsContext ctxt
; ats' <- mapM (wrapLocM (kcFamilyDecl tvs')) ats
; sigs' <- mapM (wrapLocM kc_sig) sigs
; return (decl {tcdTyVars = tvs', tcdCtxt = ctxt', tcdSigs = sigs',
kcTyClDecl decl@(ForeignType {})
= return decl
+kcTyClDecl (TySynonym {}) = panic "kcTyClDecl TySynonym"
+
kcTyClDeclBody :: TyClDecl Name
-> ([LHsTyVarBndr Name] -> TcM a)
-> TcM a
kcTyClDeclBody decl thing_inside
= tcAddDeclCtxt decl $
do { tc_ty_thing <- tcLookupLocated (tcdLName decl)
- ; let tc_kind = case tc_ty_thing of { AThing k -> k }
+ ; let tc_kind = case tc_ty_thing of
+ AThing k -> k
+ _ -> pprPanic "kcTyClDeclBody" (ppr tc_ty_thing)
(kinds, _) = splitKindFunTys tc_kind
hs_tvs = tcdTyVars decl
kinded_tvs = ASSERT( length kinds >= length hs_tvs )
-- Can't allow an unlifted type for newtypes, because we're effectively
-- going to remove the constructor while coercing it to a lifted type.
-- And newtypes can't be bang'd
+kcDataDecl d _ = pprPanic "kcDataDecl" (ppr d)
-- Kind check a family declaration or type family default declaration.
--
unifyClassParmKinds (L _ (KindedTyVar n k))
| Just classParmKind <- lookup n classTyKinds = unifyKind k classParmKind
| otherwise = return ()
+ unifyClassParmKinds x = pprPanic "kcFamilyDecl/unifyClassParmKinds" (ppr x)
classTyKinds = [(n, k) | L _ (KindedTyVar n k) <- classTvs]
-kcFamilyDecl _ decl@(TySynonym {}) -- type family defaults
+kcFamilyDecl _ (TySynonym {}) -- type family defaults
= panic "TcTyClsDecls.kcFamilyDecl: not implemented yet"
+kcFamilyDecl _ d = pprPanic "kcFamilyDecl" (ppr d)
\end{code}
; return (syn_tc : syn_tcs) }
-- "type"
+tcSynDecl :: TyClDecl Name -> TcM TyThing
tcSynDecl
(TySynonym {tcdLName = L _ tc_name, tcdTyVars = tvs, tcdSynRhs = rhs_ty})
= tcTyVarBndrs tvs $ \ tvs' -> do
{ traceTc (text "tcd1" <+> ppr tc_name)
; rhs_ty' <- tcHsKindedType rhs_ty
- ; tycon <- buildSynTyCon tc_name tvs' (SynonymTyCon rhs_ty') Nothing
+ ; tycon <- buildSynTyCon tc_name tvs' (SynonymTyCon rhs_ty')
+ (typeKind rhs_ty') Nothing
; return (ATyCon tycon)
}
+tcSynDecl d = pprPanic "tcSynDecl" (ppr d)
--------------------
tcTyClDecl :: (Name -> RecFlag) -> TyClDecl Name -> TcM [TyThing]
= tcAddDeclCtxt decl (tcTyClDecl1 calc_isrec decl)
-- "type family" declarations
+tcTyClDecl1 :: (Name -> RecFlag) -> TyClDecl Name -> TcM [TyThing]
tcTyClDecl1 _calc_isrec
(TyFamily {tcdFlavour = TypeFamily,
tcdLName = L _ tc_name, tcdTyVars = tvs, tcdKind = Just kind})
-- Check that we don't use families without -XTypeFamilies
; checkTc idx_tys $ badFamInstDecl tc_name
- ; tycon <- buildSynTyCon tc_name tvs' (OpenSynTyCon kind Nothing) Nothing
+ ; tycon <- buildSynTyCon tc_name tvs' (OpenSynTyCon kind Nothing) kind Nothing
; return [ATyCon tycon]
}
is_rec = calc_isrec tc_name
h98_syntax = case cons of -- All constructors have same shape
L _ (ConDecl { con_res = ResTyGADT _ }) : _ -> False
- other -> True
+ _ -> True
tcTyClDecl1 calc_isrec
(ClassDecl {tcdLName = L _ class_name, tcdTyVars = tvs,
ATyCon (setTyConArgPoss tycon poss)
setTyThingPoss _ _ = panic "TcTyClsDecls.setTyThingPoss"
-tcTyClDecl1 calc_isrec
+tcTyClDecl1 _
(ForeignType {tcdLName = L _ tc_name, tcdExtName = tc_ext_name})
= return [ATyCon (mkForeignTyCon tc_name tc_ext_name liftedTypeKind 0)]
+tcTyClDecl1 _ d = pprPanic "tcTyClDecl1" (ppr d)
+
-----------------------------------
tcConDecl :: Bool -- True <=> -funbox-strict_fields
-> Bool -- True <=> -XExistentialQuantificaton or -XGADTs
where
-- choose_univs uses the res_ty itself if it's a type variable
-- and hasn't already been used; otherwise it uses one of the tc_tvs
- choose_univs used tc_tvs []
+ choose_univs _ tc_tvs []
= ASSERT( null tc_tvs ) []
choose_univs used (tc_tv:tc_tvs) (res_ty:res_tys)
| Just tv <- tcGetTyVar_maybe res_ty, not (tv `elem` used)
-- interface files and general confusion. So rename
-- the tc_tvs, since they are not used yet (no
-- consequential renaming needed)
+ choose_univs _ _ _ = panic "tcResultType/choose_univs"
init_occ_env = initTidyOccEnv (map getOccName dc_tvs)
(_, tidy_tc_tvs) = mapAccumL tidy_one init_occ_env tc_tvs
tidy_one env tv = (env', setTyVarName tv (tidyNameOcc name occ'))
HsStrict | unbox_strict_fields
&& can_unbox arg_ty -> MarkedUnboxed
HsUnbox | can_unbox arg_ty -> MarkedUnboxed
- other -> MarkedStrict
+ _ -> MarkedStrict
where
-- we can unbox if the type is a chain of newtypes with a product tycon
-- at the end
; case thing of
ATyCon tc -> checkValidTyCon tc
AClass cl -> checkValidClass cl
+ _ -> panic "checkValidTyCl"
; traceTc (text "Done validity of" <+> ppr thing)
}
-- result type against other candidates' types BOTH WAYS ROUND.
-- If they magically agrees, take the substitution and
-- apply them to the latter ones, and see if they match perfectly.
- check_fields fields@((label, con1) : other_fields)
+ check_fields ((label, con1) : other_fields)
-- These fields all have the same name, but are from
-- different constructors in the data type
= recoverM (return ()) $ mapM_ checkOne other_fields
(tvs2, _, _, res2) = dataConSig con2
ts2 = mkVarSet tvs2
fty2 = dataConFieldType con2 label
+ check_fields [] = panic "checkValidTyCon/check_fields []"
+checkFieldCompat :: Name -> DataCon -> DataCon -> TyVarSet
+ -> Type -> Type -> Type -> Type -> TcM ()
checkFieldCompat fld con1 con2 tvs1 res1 res2 fty1 fty2
= do { checkTc (isJust mb_subst1) (resultTypeMisMatch fld con1 con2)
; checkTc (isJust mb_subst2) (fieldTypeMisMatch fld con1 con2) }
= setSrcSpan (srcLocSpan (getSrcLoc con)) $
addErrCtxt (dataConCtxt con) $
do { checkTc (dataConTyCon con == tc) (badDataConTyCon con)
- ; checkValidType ctxt (dataConUserType con)
; checkValidMonoType (dataConOrigResTy con)
-- Disallow MkT :: T (forall a. a->a)
-- Reason: it's really the argument of an equality constraint
+ ; checkValidType ctxt (dataConUserType con)
; when (isNewTyCon tc) (checkNewDataCon con)
}
where
---------------------------------------------------------------------
+resultTypeMisMatch :: Name -> DataCon -> DataCon -> SDoc
resultTypeMisMatch field_name con1 con2
- = vcat [sep [ptext SLIT("Constructors") <+> ppr con1 <+> ptext SLIT("and") <+> ppr con2,
- ptext SLIT("have a common field") <+> quotes (ppr field_name) <> comma],
- nest 2 $ ptext SLIT("but have different result types")]
+ = vcat [sep [ptext (sLit "Constructors") <+> ppr con1 <+> ptext (sLit "and") <+> ppr con2,
+ ptext (sLit "have a common field") <+> quotes (ppr field_name) <> comma],
+ nest 2 $ ptext (sLit "but have different result types")]
+
+fieldTypeMisMatch :: Name -> DataCon -> DataCon -> SDoc
fieldTypeMisMatch field_name con1 con2
- = sep [ptext SLIT("Constructors") <+> ppr con1 <+> ptext SLIT("and") <+> ppr con2,
- ptext SLIT("give different types for field"), quotes (ppr field_name)]
+ = sep [ptext (sLit "Constructors") <+> ppr con1 <+> ptext (sLit "and") <+> ppr con2,
+ ptext (sLit "give different types for field"), quotes (ppr field_name)]
-dataConCtxt con = ptext SLIT("In the definition of data constructor") <+> quotes (ppr con)
+dataConCtxt :: Outputable a => a -> SDoc
+dataConCtxt con = ptext (sLit "In the definition of data constructor") <+> quotes (ppr con)
-classOpCtxt sel_id tau = sep [ptext SLIT("When checking the class method:"),
+classOpCtxt :: Var -> Type -> SDoc
+classOpCtxt sel_id tau = sep [ptext (sLit "When checking the class method:"),
nest 2 (ppr sel_id <+> dcolon <+> ppr tau)]
+nullaryClassErr :: Class -> SDoc
nullaryClassErr cls
- = ptext SLIT("No parameters for class") <+> quotes (ppr cls)
+ = ptext (sLit "No parameters for class") <+> quotes (ppr cls)
+classArityErr :: Class -> SDoc
classArityErr cls
- = vcat [ptext SLIT("Too many parameters for class") <+> quotes (ppr cls),
- parens (ptext SLIT("Use -XMultiParamTypeClasses to allow multi-parameter classes"))]
+ = vcat [ptext (sLit "Too many parameters for class") <+> quotes (ppr cls),
+ parens (ptext (sLit "Use -XMultiParamTypeClasses to allow multi-parameter classes"))]
+classFunDepsErr :: Class -> SDoc
classFunDepsErr cls
- = vcat [ptext SLIT("Fundeps in class") <+> quotes (ppr cls),
- parens (ptext SLIT("Use -XFunctionalDependencies to allow fundeps"))]
+ = vcat [ptext (sLit "Fundeps in class") <+> quotes (ppr cls),
+ parens (ptext (sLit "Use -XFunctionalDependencies to allow fundeps"))]
+noClassTyVarErr :: Class -> Var -> SDoc
noClassTyVarErr clas op
- = sep [ptext SLIT("The class method") <+> quotes (ppr op),
- ptext SLIT("mentions none of the type variables of the class") <+>
+ = sep [ptext (sLit "The class method") <+> quotes (ppr op),
+ ptext (sLit "mentions none of the type variables of the class") <+>
ppr clas <+> hsep (map ppr (classTyVars clas))]
+genericMultiParamErr :: Class -> SDoc
genericMultiParamErr clas
- = ptext SLIT("The multi-parameter class") <+> quotes (ppr clas) <+>
- ptext SLIT("cannot have generic methods")
+ = ptext (sLit "The multi-parameter class") <+> quotes (ppr clas) <+>
+ ptext (sLit "cannot have generic methods")
+badGenericMethodType :: Name -> Kind -> SDoc
badGenericMethodType op op_ty
- = hang (ptext SLIT("Generic method type is too complex"))
+ = hang (ptext (sLit "Generic method type is too complex"))
4 (vcat [ppr op <+> dcolon <+> ppr op_ty,
- ptext SLIT("You can only use type variables, arrows, lists, and tuples")])
+ ptext (sLit "You can only use type variables, arrows, lists, and tuples")])
+recSynErr :: [LTyClDecl Name] -> TcRn ()
recSynErr syn_decls
= setSrcSpan (getLoc (head sorted_decls)) $
- addErr (sep [ptext SLIT("Cycle in type synonym declarations:"),
+ addErr (sep [ptext (sLit "Cycle in type synonym declarations:"),
nest 2 (vcat (map ppr_decl sorted_decls))])
where
sorted_decls = sortLocated syn_decls
ppr_decl (L loc decl) = ppr loc <> colon <+> ppr decl
+recClsErr :: [Located (TyClDecl Name)] -> TcRn ()
recClsErr cls_decls
= setSrcSpan (getLoc (head sorted_decls)) $
- addErr (sep [ptext SLIT("Cycle in class declarations (via superclasses):"),
+ addErr (sep [ptext (sLit "Cycle in class declarations (via superclasses):"),
nest 2 (vcat (map ppr_decl sorted_decls))])
where
sorted_decls = sortLocated cls_decls
where
le (L l1 _) (L l2 _) = l1 <= l2
+badDataConTyCon :: DataCon -> SDoc
badDataConTyCon data_con
- = hang (ptext SLIT("Data constructor") <+> quotes (ppr data_con) <+>
- ptext SLIT("returns type") <+> quotes (ppr (dataConTyCon data_con)))
- 2 (ptext SLIT("instead of its parent type"))
+ = hang (ptext (sLit "Data constructor") <+> quotes (ppr data_con) <+>
+ ptext (sLit "returns type") <+> quotes (ppr (dataConTyCon data_con)))
+ 2 (ptext (sLit "instead of its parent type"))
+badGadtDecl :: Name -> SDoc
badGadtDecl tc_name
- = vcat [ ptext SLIT("Illegal generalised algebraic data declaration for") <+> quotes (ppr tc_name)
- , nest 2 (parens $ ptext SLIT("Use -XGADTs to allow GADTs")) ]
+ = vcat [ ptext (sLit "Illegal generalised algebraic data declaration for") <+> quotes (ppr tc_name)
+ , nest 2 (parens $ ptext (sLit "Use -XGADTs to allow GADTs")) ]
+badExistential :: Located Name -> SDoc
badExistential con_name
- = hang (ptext SLIT("Data constructor") <+> quotes (ppr con_name) <+>
- ptext SLIT("has existential type variables, or a context"))
- 2 (parens $ ptext SLIT("Use -XExistentialQuantification or -XGADTs to allow this"))
+ = hang (ptext (sLit "Data constructor") <+> quotes (ppr con_name) <+>
+ ptext (sLit "has existential type variables, or a context"))
+ 2 (parens $ ptext (sLit "Use -XExistentialQuantification or -XGADTs to allow this"))
+badStupidTheta :: Name -> SDoc
badStupidTheta tc_name
- = ptext SLIT("A data type declared in GADT style cannot have a context:") <+> quotes (ppr tc_name)
+ = ptext (sLit "A data type declared in GADT style cannot have a context:") <+> quotes (ppr tc_name)
+newtypeConError :: Name -> Int -> SDoc
newtypeConError tycon n
- = sep [ptext SLIT("A newtype must have exactly one constructor,"),
- nest 2 $ ptext SLIT("but") <+> quotes (ppr tycon) <+> ptext SLIT("has") <+> speakN n ]
+ = sep [ptext (sLit "A newtype must have exactly one constructor,"),
+ nest 2 $ ptext (sLit "but") <+> quotes (ppr tycon) <+> ptext (sLit "has") <+> speakN n ]
+newtypeExError :: DataCon -> SDoc
newtypeExError con
- = sep [ptext SLIT("A newtype constructor cannot have an existential context,"),
- nest 2 $ ptext SLIT("but") <+> quotes (ppr con) <+> ptext SLIT("does")]
+ = sep [ptext (sLit "A newtype constructor cannot have an existential context,"),
+ nest 2 $ ptext (sLit "but") <+> quotes (ppr con) <+> ptext (sLit "does")]
+newtypeStrictError :: DataCon -> SDoc
newtypeStrictError con
- = sep [ptext SLIT("A newtype constructor cannot have a strictness annotation,"),
- nest 2 $ ptext SLIT("but") <+> quotes (ppr con) <+> ptext SLIT("does")]
+ = sep [ptext (sLit "A newtype constructor cannot have a strictness annotation,"),
+ nest 2 $ ptext (sLit "but") <+> quotes (ppr con) <+> ptext (sLit "does")]
+newtypePredError :: DataCon -> SDoc
newtypePredError con
- = sep [ptext SLIT("A newtype constructor must have a return type of form T a1 ... an"),
- nest 2 $ ptext SLIT("but") <+> quotes (ppr con) <+> ptext SLIT("does not")]
+ = sep [ptext (sLit "A newtype constructor must have a return type of form T a1 ... an"),
+ nest 2 $ ptext (sLit "but") <+> quotes (ppr con) <+> ptext (sLit "does not")]
+newtypeFieldErr :: DataCon -> Int -> SDoc
newtypeFieldErr con_name n_flds
- = sep [ptext SLIT("The constructor of a newtype must have exactly one field"),
- nest 2 $ ptext SLIT("but") <+> quotes (ppr con_name) <+> ptext SLIT("has") <+> speakN n_flds]
+ = sep [ptext (sLit "The constructor of a newtype must have exactly one field"),
+ nest 2 $ ptext (sLit "but") <+> quotes (ppr con_name) <+> ptext (sLit "has") <+> speakN n_flds]
+badSigTyDecl :: Name -> SDoc
badSigTyDecl tc_name
- = vcat [ ptext SLIT("Illegal kind signature") <+>
+ = vcat [ ptext (sLit "Illegal kind signature") <+>
quotes (ppr tc_name)
- , nest 2 (parens $ ptext SLIT("Use -XKindSignatures to allow kind signatures")) ]
+ , nest 2 (parens $ ptext (sLit "Use -XKindSignatures to allow kind signatures")) ]
+badFamInstDecl :: Outputable a => a -> SDoc
badFamInstDecl tc_name
- = vcat [ ptext SLIT("Illegal family instance for") <+>
+ = vcat [ ptext (sLit "Illegal family instance for") <+>
quotes (ppr tc_name)
- , nest 2 (parens $ ptext SLIT("Use -XTypeFamilies to allow indexed type families")) ]
+ , nest 2 (parens $ ptext (sLit "Use -XTypeFamilies to allow indexed type families")) ]
+badGadtIdxTyDecl :: Name -> SDoc
badGadtIdxTyDecl tc_name
- = vcat [ ptext SLIT("Illegal generalised algebraic data declaration for") <+>
+ = vcat [ ptext (sLit "Illegal generalised algebraic data declaration for") <+>
quotes (ppr tc_name)
- , nest 2 (parens $ ptext SLIT("Family instances can not yet use GADT declarations")) ]
+ , nest 2 (parens $ ptext (sLit "Family instances can not yet use GADT declarations")) ]
+tooManyParmsErr :: Located Name -> SDoc
tooManyParmsErr tc_name
- = ptext SLIT("Family instance has too many parameters:") <+>
+ = ptext (sLit "Family instance has too many parameters:") <+>
quotes (ppr tc_name)
+tooFewParmsErr :: Arity -> SDoc
tooFewParmsErr arity
- = ptext SLIT("Family instance has too few parameters; expected") <+>
+ = ptext (sLit "Family instance has too few parameters; expected") <+>
ppr arity
+wrongNumberOfParmsErr :: Arity -> SDoc
wrongNumberOfParmsErr exp_arity
- = ptext SLIT("Number of parameters must match family declaration; expected")
+ = ptext (sLit "Number of parameters must match family declaration; expected")
<+> ppr exp_arity
+badBootFamInstDeclErr :: SDoc
badBootFamInstDeclErr =
- ptext SLIT("Illegal family instance in hs-boot file")
+ ptext (sLit "Illegal family instance in hs-boot file")
+wrongKindOfFamily :: TyCon -> SDoc
wrongKindOfFamily family =
- ptext SLIT("Wrong category of family instance; declaration was for a") <+>
+ ptext (sLit "Wrong category of family instance; declaration was for a") <+>
kindOfFamily
where
- kindOfFamily | isSynTyCon family = ptext SLIT("type synonym")
- | isAlgTyCon family = ptext SLIT("data type")
+ kindOfFamily | isSynTyCon family = ptext (sLit "type synonym")
+ | isAlgTyCon family = ptext (sLit "data type")
| otherwise = pprPanic "wrongKindOfFamily" (ppr family)
+emptyConDeclsErr :: Name -> SDoc
emptyConDeclsErr tycon
- = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"),
- nest 2 $ ptext SLIT("(-XEmptyDataDecls permits this)")]
+ = sep [quotes (ppr tycon) <+> ptext (sLit "has no constructors"),
+ nest 2 $ ptext (sLit "(-XEmptyDataDecls permits this)")]
\end{code}