) where
-import Ubiq
+IMP_Ubiq()
import HsSyn ( InstDecl(..), FixityDecl, Sig(..),
SpecInstSig(..), HsBinds(..), Bind(..),
MonoBinds(..), GRHSsAndBinds, Match,
InPat(..), OutPat(..), HsExpr(..), HsLit(..),
- Stmt, Qual, ArithSeqInfo, Fake,
+ Stmt, Qualifier, ArithSeqInfo, Fake,
PolyType(..), MonoType )
-import RnHsSyn ( RenamedHsBinds(..), RenamedMonoBinds(..),
+import RnHsSyn ( SYN_IE(RenamedHsBinds), SYN_IE(RenamedMonoBinds),
RenamedInstDecl(..), RenamedFixityDecl(..),
- RenamedSig(..), RenamedSpecInstSig(..) )
-import TcHsSyn ( TcIdOcc(..), TcHsBinds(..),
- TcMonoBinds(..), TcExpr(..), tcIdType,
+ RenamedSig(..), RenamedSpecInstSig(..),
+ RnName(..){-incl instance Outputable-}
+ )
+import TcHsSyn ( TcIdOcc(..), SYN_IE(TcHsBinds),
+ SYN_IE(TcMonoBinds), SYN_IE(TcExpr), tcIdType,
mkHsTyLam, mkHsTyApp,
mkHsDictLam, mkHsDictApp )
-import TcMonad
+import TcMonad hiding ( rnMtoTcM )
import GenSpecEtc ( checkSigTyVars )
-import Inst ( Inst, InstOrigin(..), InstanceMapper(..),
- newDicts, newMethod, LIE(..), emptyLIE, plusLIE )
+import Inst ( Inst, InstOrigin(..), SYN_IE(InstanceMapper),
+ newDicts, newMethod, SYN_IE(LIE), emptyLIE, plusLIE )
import TcBinds ( tcPragmaSigs )
import TcDeriv ( tcDeriving )
-import TcEnv ( tcLookupClass, tcTyVarScope, newLocalId )
+import TcEnv ( tcLookupClass, tcTyVarScope, newLocalId, tcExtendGlobalTyVars )
+import SpecEnv ( SpecEnv )
import TcGRHSs ( tcGRHSsAndBinds )
import TcInstUtil ( InstInfo(..), mkInstanceRelatedIds, buildInstanceEnvs )
import TcKind ( TcKind, unifyKind )
import TcMatches ( tcMatchesFun )
import TcMonoType ( tcContext, tcMonoTypeKind )
-import TcSimplify ( tcSimplifyAndCheck, tcSimplifyThetas )
-import TcType ( TcType(..), TcTyVar(..),
- tcInstSigTyVars, tcInstType, tcInstTheta
+import TcSimplify ( tcSimplifyAndCheck )
+import TcType ( SYN_IE(TcType), SYN_IE(TcTyVar), SYN_IE(TcTyVarSet),
+ tcInstSigTyVars, tcInstType, tcInstTheta, tcInstTcType
)
-import Unify ( unifyTauTy )
+import Unify ( unifyTauTy, unifyTauTyLists )
import Bag ( emptyBag, unitBag, unionBags, unionManyBags,
concatBag, foldBag, bagToList )
-import CmdLineOpts ( opt_GlasgowExts, opt_CompilingPrelude,
+import CmdLineOpts ( opt_GlasgowExts, opt_CompilingGhcInternals,
opt_OmitDefaultInstanceMethods,
- opt_SpecialiseOverloaded )
+ opt_SpecialiseOverloaded
+ )
import Class ( GenClass, GenClassOp,
- isCcallishClass, getClassBigSig,
- getClassOps, getClassOpLocalType )
-import CoreUtils ( escErrorMsg )
+ isCcallishClass, classBigSig,
+ classOps, classOpLocalType,
+ classOpTagByString_maybe
+ )
import Id ( GenId, idType, isDefaultMethodId_maybe )
import ListSetOps ( minusList )
import Maybes ( maybeToBool, expectJust )
-import Name ( Name, getTagFromClassOpName )
-import Outputable
-import PrelInfo ( pAT_ERROR_ID )
+import Name ( getLocalName, origName, nameOf, Name{--O only-} )
+import PrelVals ( nO_EXPLICIT_METHOD_ERROR_ID )
+import PrelMods ( pRELUDE )
import PprType ( GenType, GenTyVar, GenClass, GenClassOp, TyCon,
- pprParendGenType )
+ pprParendGenType
+ )
import PprStyle
import Pretty
-import RnUtils ( GlobalNameMappers(..), GlobalNameMapper(..) )
-import TyCon ( derivedFor )
-import Type ( GenType(..), ThetaType(..), mkTyVarTys,
+import RnUtils ( SYN_IE(RnEnv) )
+import TyCon ( isSynTyCon, derivedFor )
+import Type ( GenType(..), SYN_IE(ThetaType), mkTyVarTys,
splitSigmaTy, splitAppTy, isTyVarTy, matchTy, mkSigmaTy,
- getTyCon_maybe, maybeBoxedPrimType )
-import TyVar ( GenTyVar, mkTyVarSet )
+ getTyCon_maybe, maybeBoxedPrimType, splitRhoTy, eqTy
+ )
+import TyVar ( GenTyVar, SYN_IE(GenTyVarSet), mkTyVarSet, unionTyVarSets )
import TysWiredIn ( stringTy )
import Unique ( Unique )
-import Util ( panic )
-
+import Util ( zipEqual, panic )
\end{code}
Typechecking instance declarations is done in two passes. The first
\begin{code}
tcInstDecls1 :: Bag RenamedInstDecl
-> [RenamedSpecInstSig]
- -> FAST_STRING -- module name for deriving
- -> GlobalNameMappers -- renamer fns for deriving
+ -> Module -- module name for deriving
+ -> RnEnv -- for renaming derivings
-> [RenamedFixityDecl] -- fixities for deriving
-> TcM s (Bag InstInfo,
RenamedHsBinds,
PprStyle -> Pretty)
-tcInstDecls1 inst_decls specinst_sigs mod_name renamer_name_funs fixities
+tcInstDecls1 inst_decls specinst_sigs mod_name rn_env fixities
= -- Do the ordinary instance declarations
mapBagNF_Tc (tcInstDecl1 mod_name) inst_decls
`thenNF_Tc` \ inst_info_bags ->
-- for things in this module; we ignore deriving decls from
-- interfaces! We pass fixities, because they may be used
-- in deriving Read and Show.
- tcDeriving mod_name renamer_name_funs decl_inst_info fixities
+ tcDeriving mod_name rn_env decl_inst_info fixities
`thenTc` \ (deriv_inst_info, deriv_binds, ddump_deriv) ->
let
-- Look things up
tcLookupClass class_name `thenNF_Tc` \ (clas_kind, clas) ->
+ let
+ de_rn (RnName n) = n
+ in
-- Typecheck the context and instance type
- tcTyVarScope tyvar_names (\ tyvars ->
+ tcTyVarScope (map de_rn tyvar_names) (\ tyvars ->
tcContext context `thenTc` \ theta ->
tcMonoTypeKind inst_ty `thenTc` \ (tau_kind, tau) ->
unifyKind clas_kind tau_kind `thenTc_`
if (not from_here && (clas `derivedFor` inst_tycon)
&& all isTyVarTy arg_tys)
then
- if mod_name == inst_mod then
+ if mod_name == inst_mod
+ then
-- Imported instance came from this module;
-- discard and derive fresh instance
returnTc emptyBag
else
-- Make the dfun id and constant-method ids
- mkInstanceRelatedIds from_here inst_mod pragmas
+ mkInstanceRelatedIds from_here src_loc inst_mod pragmas
clas inst_tyvars inst_tau inst_theta uprags
`thenTc` \ (dfun_id, dfun_theta, const_meth_ids) ->
let
(class_tyvar,
super_classes, sc_sel_ids,
- class_ops, op_sel_ids, defm_ids) = getClassBigSig clas
+ class_ops, op_sel_ids, defm_ids) = classBigSig clas
in
tcInstType tenv inst_ty `thenNF_Tc` \ inst_ty' ->
tcInstTheta tenv dfun_theta `thenNF_Tc` \ dfun_theta' ->
tcInstTheta tenv inst_decl_theta `thenNF_Tc` \ inst_decl_theta' ->
let
- sc_theta' = super_classes `zip` (repeat inst_ty')
+ sc_theta' = super_classes `zip` repeat inst_ty'
origin = InstanceDeclOrigin
- mk_method sel_id = newMethodId sel_id inst_ty' origin locn
+ mk_method sel_id = newMethod origin (RealId sel_id) [inst_ty']
in
-- Create dictionary Ids from the specified instance contexts.
newDicts origin sc_theta' `thenNF_Tc` \ (sc_dicts, sc_dict_ids) ->
-- Collect available Insts
let
+ inst_tyvars_set' = mkTyVarSet inst_tyvars'
+
avail_insts -- These insts are in scope; quite a few, eh?
= unionManyBags (this_dict : dfun_arg_dicts : meth_insts_s)
else
makeInstanceDeclDefaultMethodExpr origin meth_ids defm_ids inst_ty' this_dict_id
in
- processInstBinds mk_method_expr inst_tyvars' avail_insts meth_ids monobinds
- `thenTc` \ (insts_needed, method_mbinds) ->
+ tcExtendGlobalTyVars inst_tyvars_set' (
+ processInstBinds clas mk_method_expr avail_insts meth_ids monobinds
+ ) `thenTc` \ (insts_needed, method_mbinds) ->
let
-- Create the dict and method binds
dict_bind
dict_and_method_binds
= dict_bind `AndMonoBinds` method_mbinds
- inst_tyvars_set' = mkTyVarSet inst_tyvars'
in
-- Check the overloading constraints of the methods and superclasses
tcAddErrCtxt (bindSigCtxt meth_ids) (
inst_tyvars'
dfun_arg_dicts_ids
((this_dict_id, RealId dfun_id)
- : (meth_ids `zip` (map RealId const_meth_ids)))
- -- const_meth_ids will often be empty
+ : (meth_ids `zip` map RealId const_meth_ids))
+ -- NB: const_meth_ids will often be empty
super_binds
(RecBind dict_and_method_binds)
returnTc (const_lie `plusLIE` spec_lie, inst_binds)
\end{code}
-@mkMethodId@ manufactures an id for a local method.
-It's rather turgid stuff, because there are two cases:
-
- (a) For methods with no local polymorphism, we can make an Inst of the
- class-op selector function and a corresp InstId;
- which is good because then other methods which call
- this one will do so directly.
-
- (b) For methods with local polymorphism, we can't do this. For example,
-
- class Foo a where
- op :: (Num b) => a -> b -> a
-
- Here the type of the class-op-selector is
-
- forall a b. (Foo a, Num b) => a -> b -> a
-
- The locally defined method at (say) type Float will have type
-
- forall b. (Num b) => Float -> b -> Float
-
- and the one is not an instance of the other.
-
- So for these we just make a local (non-Inst) id with a suitable type.
-
-How disgusting.
-
-\begin{code}
-newMethodId sel_id inst_ty origin loc
- = let (sel_tyvars,sel_theta,sel_tau) = splitSigmaTy (idType sel_id)
- (_:meth_theta) = sel_theta -- The local theta is all except the
- -- first element of the context
- in
- case sel_tyvars of
- -- Ah! a selector for a class op with no local polymorphism
- -- Build an Inst for this
- [clas_tyvar] -> newMethod origin (RealId sel_id) [inst_ty]
-
- -- Ho! a selector for a class op with local polymorphism.
- -- Just make a suitably typed local id for this
- (clas_tyvar:local_tyvars) ->
- tcInstType [(clas_tyvar,inst_ty)]
- (mkSigmaTy local_tyvars meth_theta sel_tau)
- `thenNF_Tc` \ method_ty ->
- newLocalId (getOccurrenceName sel_id) method_ty `thenNF_Tc` \ meth_id ->
- returnNF_Tc (emptyLIE, meth_id)
-\end{code}
-
The next function makes a default method which calls the global default method, at
the appropriate instance type.
-> NF_TcM s (TcExpr s)
makeInstanceDeclDefaultMethodExpr origin meth_ids defm_ids inst_ty this_dict tag
- = newDicts origin op_theta `thenNF_Tc` \ (op_lie,op_dicts) ->
-
- -- def_op_id = /\ op_tyvars -> \ op_dicts ->
- -- defm_id inst_ty op_tyvars this_dict op_dicts
- returnNF_Tc (
- mkHsTyLam op_tyvars (
- mkHsDictLam op_dicts (
- mkHsDictApp (mkHsTyApp (HsVar (RealId defm_id))
- (inst_ty : mkTyVarTys op_tyvars))
- (this_dict : op_dicts)
- )))
+ =
+ -- def_op_id = defm_id inst_ty this_dict
+ returnNF_Tc (mkHsDictApp (mkHsTyApp (HsVar (RealId defm_id)) [inst_ty]) [this_dict])
where
idx = tag - 1
meth_id = meth_ids !! idx
defm_id = defm_ids !! idx
- (op_tyvars, op_theta, op_tau) = splitSigmaTy (tcIdType meth_id)
makeInstanceDeclNoDefaultExpr
:: InstOrigin s
-> [Id]
-> TcType s
-> Class
- -> FAST_STRING
+ -> Module
-> Int
-> NF_TcM s (TcExpr s)
makeInstanceDeclNoDefaultExpr origin meth_ids defm_ids inst_ty clas inst_mod tag
- = newDicts origin op_theta `thenNF_Tc` \ (op_lie, op_dicts) ->
-
+ =
-- Produce a warning if the default instance method
-- has been omitted when one exists in the class
warnTc (not err_defm_ok)
(omitDefaultMethodWarn clas_op clas_name inst_ty)
`thenNF_Tc_`
- returnNF_Tc (mkHsTyLam op_tyvars (
- mkHsDictLam op_dicts (
- HsApp (mkHsTyApp (HsVar (RealId pAT_ERROR_ID)) [op_tau])
- (HsLitOut (HsString (_PK_ error_msg)) stringTy))))
+ returnNF_Tc (HsApp (mkHsTyApp (HsVar (RealId nO_EXPLICIT_METHOD_ERROR_ID)) [tcIdType meth_id])
+ (HsLitOut (HsString (_PK_ error_msg)) stringTy))
where
idx = tag - 1
meth_id = meth_ids !! idx
- clas_op = (getClassOps clas) !! idx
+ clas_op = (classOps clas) !! idx
defm_id = defm_ids !! idx
- (op_tyvars,op_theta,op_tau) = splitSigmaTy (tcIdType meth_id)
Just (_, _, err_defm_ok) = isDefaultMethodId_maybe defm_id
- error_msg = "%E" -- => No explicit method for \"
- ++ escErrorMsg error_str
-
- error_str = _UNPK_ inst_mod ++ "." ++ _UNPK_ clas_name ++ "."
+ error_msg = _UNPK_ inst_mod ++ "." ++ _UNPK_ clas_name ++ "."
++ (ppShow 80 (ppr PprForUser inst_ty)) ++ "."
++ (ppShow 80 (ppr PprForUser clas_op)) ++ "\""
- (_, clas_name) = getOrigName clas
+ clas_name = nameOf (origName "makeInstanceDeclNoDefaultExpr" clas)
\end{code}
\begin{code}
processInstBinds
- :: (Int -> NF_TcM s (TcExpr s)) -- Function to make default method
- -> [TcTyVar s] -- Tyvars for this instance decl
+ :: Class
+ -> (Int -> NF_TcM s (TcExpr s)) -- Function to make default method
-> LIE s -- available Insts
-> [TcIdOcc s] -- Local method ids in tag order
-- (instance tyvars are free in their types)
-> TcM s (LIE s, -- These are required
TcMonoBinds s)
-processInstBinds mk_default_method_rhs inst_tyvars avail_insts method_ids monobinds
+processInstBinds clas mk_default_method_rhs avail_insts method_ids monobinds
=
-- Process the explicitly-given method bindings
- processInstBinds1 inst_tyvars avail_insts method_ids monobinds
+ processInstBinds1 clas avail_insts method_ids monobinds
`thenTc` \ (tags, insts_needed_in_methods, method_binds) ->
-- Find the methods not handled, and make default method bindings for them.
\begin{code}
processInstBinds1
- :: [TcTyVar s] -- Tyvars for this instance decl
+ :: Class
-> LIE s -- available Insts
-> [TcIdOcc s] -- Local method ids in tag order (instance tyvars are free),
-> RenamedMonoBinds
LIE s, -- These are required
TcMonoBinds s)
-processInstBinds1 inst_tyvars avail_insts method_ids EmptyMonoBinds
+processInstBinds1 clas avail_insts method_ids EmptyMonoBinds
= returnTc ([], emptyLIE, EmptyMonoBinds)
-processInstBinds1 inst_tyvars avail_insts method_ids (AndMonoBinds mb1 mb2)
- = processInstBinds1 inst_tyvars avail_insts method_ids mb1
+processInstBinds1 clas avail_insts method_ids (AndMonoBinds mb1 mb2)
+ = processInstBinds1 clas avail_insts method_ids mb1
`thenTc` \ (op_tags1,dicts1,method_binds1) ->
- processInstBinds1 inst_tyvars avail_insts method_ids mb2
+ processInstBinds1 clas avail_insts method_ids mb2
`thenTc` \ (op_tags2,dicts2,method_binds2) ->
returnTc (op_tags1 ++ op_tags2,
dicts1 `unionBags` dicts2,
\end{code}
\begin{code}
-processInstBinds1 inst_tyvars avail_insts method_ids mbind
+processInstBinds1 clas avail_insts method_ids mbind
=
-- Find what class op is being defined here. The complication is
-- that we could have a PatMonoBind or a FunMonoBind. If the
-- Renamer has reduced us to these two cases.
let
(op,locn) = case mbind of
- FunMonoBind op _ locn -> (op, locn)
+ FunMonoBind op _ _ locn -> (op, locn)
PatMonoBind (VarPatIn op) _ locn -> (op, locn)
- occ = getOccurrenceName op
+ occ = getLocalName op
origin = InstanceDeclOrigin
in
tcAddSrcLoc locn $
-- Make a method id for the method
- let tag = getTagFromClassOpName op
- method_id = method_ids !! (tag-1)
+ let
+ maybe_tag = classOpTagByString_maybe clas occ
+ (Just tag) = maybe_tag
+ method_id = method_ids !! (tag-1)
+ method_ty = tcIdType method_id
+ in
+ -- check that the method mentioned is actually in the class:
+ checkMaybeTc maybe_tag (instMethodNotInClassErr occ clas) `thenTc_`
- TcId method_bndr = method_id
- method_ty = idType method_bndr
- (method_tyvars, method_theta, method_tau) = splitSigmaTy method_ty
+ tcInstTcType method_ty `thenNF_Tc` \ (method_tyvars, method_rho) ->
+ let
+ (method_theta, method_tau) = splitRhoTy method_rho
in
- newDicts origin method_theta `thenNF_Tc` \ (method_dicts,method_dict_ids) ->
+ newDicts origin method_theta `thenNF_Tc` \ (method_dicts,method_dict_ids) ->
case (method_tyvars, method_dict_ids) of
-- The latter is needed just so we can return an AbsBinds wrapped
-- up inside a MonoBinds.
+
+ -- Make the method_tyvars into signature tyvars so they
+ -- won't get unified with anything.
+ tcInstSigTyVars method_tyvars `thenNF_Tc` \ (sig_tyvars, sig_tyvar_tys, _) ->
+ unifyTauTyLists sig_tyvar_tys (mkTyVarTys method_tyvars) `thenTc_`
+
newLocalId occ method_tau `thenNF_Tc` \ local_id ->
newLocalId occ method_ty `thenNF_Tc` \ copy_id ->
let
- inst_method_tyvars = inst_tyvars ++ method_tyvars
+ sig_tyvar_set = mkTyVarSet sig_tyvars
in
-- Typecheck the method
tcMethodBind local_id method_tau mbind `thenTc` \ (mbind', lieIop) ->
-- Check the overloading part of the signature.
+
+ -- =========== POSSIBLE BUT NOT DONE =================
-- Simplify everything fully, even though some
-- constraints could "really" be left to the next
-- level out. The case which forces this is
--
-- Here we must simplify constraints on "a" to catch all
-- the Bar-ish things.
+
+ -- We don't do this because it's currently illegal Haskell (not sure why),
+ -- and because the local type of the method would have a context at
+ -- the front with no for-all, which confuses the hell out of everything!
+ -- ====================================================
+
tcAddErrCtxt (methodSigCtxt op method_ty) (
+ checkSigTyVars
+ sig_tyvars method_tau `thenTc_`
+
tcSimplifyAndCheck
- (mkTyVarSet inst_method_tyvars)
+ sig_tyvar_set
(method_dicts `plusLIE` avail_insts)
lieIop
) `thenTc` \ (f_dicts, dict_binds) ->
+
returnTc ([tag],
f_dicts,
VarMonoBind method_id
tcMethodBind :: TcIdOcc s -> TcType s -> RenamedMonoBinds
-> TcM s (TcMonoBinds s, LIE s)
-tcMethodBind meth_id meth_ty (FunMonoBind name matches locn)
+tcMethodBind meth_id meth_ty (FunMonoBind name inf matches locn)
= tcMatchesFun name meth_ty matches `thenTc` \ (rhs', lie) ->
- returnTc (FunMonoBind meth_id rhs' locn, lie)
+ returnTc (FunMonoBind meth_id inf rhs' locn, lie)
tcMethodBind meth_id meth_ty pbind@(PatMonoBind pat grhss_and_binds locn)
-- pat is sure to be a (VarPatIn op)
clas = lookupCE ce class_name -- Renamer ensures this can't fail
-- Make some new type variables, named as in the specialised instance type
- ty_names = extractMonoTyNames (==) ty
+ ty_names = extractMonoTyNames ???is_tyvarish_name??? ty
(tmpl_e,inst_tmpls,inst_tmpl_tys) = mkTVE ty_names
in
babyTcMtoTcM (tcInstanceType ce tce tmpl_e True src_loc ty)
mk_spec_origin clas ty
= InstanceSpecOrigin inst_mapper clas ty src_loc
+ -- I'm VERY SUSPICIOUS ABOUT THIS
+ -- the inst-mapper is in a knot at this point so it's no good
+ -- looking at it in tcSimplify...
in
tcSimplifyThetas mk_spec_origin subst_tv_theta
`thenTc` \ simpl_tv_theta ->
let
simpl_theta = [ (clas, tv_to_tmpl tv) | (clas, tv) <- simpl_tv_theta ]
- tv_tmpl_map = inst_tv_tys `zipEqual` inst_tmpl_tys
+ tv_tmpl_map = zipEqual "tcSpecInstSig" inst_tv_tys inst_tmpl_tys
tv_to_tmpl tv = assoc "tcSpecInstSig" tv_tmpl_map tv
in
- mkInstanceRelatedIds e True{-from here-} mod NoInstancePragmas src_loc
+ mkInstanceRelatedIds e True{-from here-} src_loc mod NoInstancePragmas
clas inst_tmpls inst_ty simpl_theta uprag
`thenTc` \ (dfun_id, dfun_theta, const_meth_ids) ->
\begin{code}
scrutiniseInstanceType from_here clas inst_tau
-- TYCON CHECK
- | not (maybeToBool inst_tycon_maybe)
+ | not (maybeToBool inst_tycon_maybe) || isSynTyCon inst_tycon
= failTc (instTypeErr inst_tau)
-- IMPORTED INSTANCES ARE OK (but see tcInstDecl1)
- | from_here
+ | not from_here
= returnTc (inst_tycon,arg_tys)
-- TYVARS CHECK
| not (all isTyVarTy arg_tys ||
- not from_here ||
opt_GlasgowExts)
= failTc (instTypeErr inst_tau)
= failTc (derivingWhenInstanceExistsErr clas inst_tycon)
| -- CCALL CHECK
- -- A user declaration of a _CCallable/_CReturnable instance
+ -- A user declaration of a CCallable/CReturnable instance
-- must be for a "boxed primitive" type.
isCcallishClass clas
- && not opt_CompilingPrelude -- which allows anything
- && maybeToBool (maybeBoxedPrimType inst_tau)
+ && not (maybeToBool (maybeBoxedPrimType inst_tau)
+ || opt_CompilingGhcInternals) -- this lets us get up to mischief;
+ -- e.g., instance CCallable ()
= failTc (nonBoxedPrimCCallErr clas inst_tau)
| otherwise
derivingWhenInstanceImportedErr inst_mod clas tycon sty
= ppHang (ppBesides [ppStr "Deriving class `", ppr sty clas, ppStr "' type `", ppr sty tycon, ppStr "'"])
- 4 (ppBesides [ppStr "when an instance declared in module `", ppPStr inst_mod, ppStr "' has been imported"])
+ 4 (ppBesides [ppStr "when an instance declared in module `", pp_mod, ppStr "' has been imported"])
+ where
+ pp_mod = ppBesides [ppStr "module `", ppPStr inst_mod, ppStr "'"]
nonBoxedPrimCCallErr clas inst_ty sty
= ppHang (ppStr "Instance isn't for a `boxed-primitive' type")
ppr sty clas_op, ppStr "in instance",
ppPStr clas_name, pprParendGenType sty inst_ty]
+instMethodNotInClassErr occ clas sty
+ = ppHang (ppStr "Instance mentions a method not in the class")
+ 4 (ppBesides [ppStr "class `", ppr sty clas, ppStr "' method `",
+ ppPStr occ, ppStr "'"])
patMonoBindsCtxt pbind sty
= ppHang (ppStr "In a pattern binding:")
projects / ghc-hetmet.git / blobdiff