plusLIEs, mkLIE, isEmptyLIE, lieToList, listToLIE,
Inst,
- pprInst, pprInsts, pprInstsInFull, tidyInsts,
+ pprInst, pprInsts, pprInstsInFull, tidyInsts, tidyMoreInsts,
- newDictsFromOld, newDicts,
- newMethod, newMethodWithGivenTy, newOverloadedLit,
- newIPDict, tcInstId,
+ newDictsFromOld, newDicts, cloneDict,
+ newMethod, newMethodWithGivenTy, newMethodAtLoc,
+ newOverloadedLit, newIPDict, tcInstCall,
- tyVarsOfInst, tyVarsOfInsts, tyVarsOfLIE, instLoc, getDictClassTys,
- getIPs,
- predsOfInsts, predsOfInst,
+ tyVarsOfInst, tyVarsOfInsts, tyVarsOfLIE,
+ ipNamesOfInst, ipNamesOfInsts, predsOfInst, predsOfInsts,
+ instLoc, getDictClassTys, dictPred,
lookupInst, lookupSimpleInst, LookupInstResult(..),
- isDict, isClassDict, isMethod, instMentionsIPs,
+ isDict, isClassDict, isMethod,
+ isLinearInst, linearInstType,
isTyVarDict, isStdClassTyVarDict, isMethodFor,
instBindingRequired, instCanBeGeneralised,
#include "HsVersions.h"
-import CmdLineOpts ( opt_NoMethodSharing )
import HsSyn ( HsLit(..), HsOverLit(..), HsExpr(..) )
-import TcHsSyn ( TcExpr, TcId,
+import TcHsSyn ( TcExpr, TcId, TypecheckedHsExpr,
mkHsTyApp, mkHsDictApp, mkHsConApp, zonkId
)
import TcMonad
-import TcEnv ( TcIdSet, tcGetInstEnv, tcLookupSyntaxId )
+import TcEnv ( TcIdSet, tcGetInstEnv, tcLookupId )
import InstEnv ( InstLookupResult(..), lookupInstEnv )
-import TcType ( TcThetaType,
- TcType, TcTauType, TcTyVarSet,
- zonkTcType, zonkTcTypes, zonkTcPredType,
- zonkTcThetaType, tcInstTyVar, tcInstType
+import TcMType ( zonkTcType, zonkTcTypes, zonkTcPredType,
+ zonkTcThetaType, tcInstTyVar, tcInstType,
+ )
+import TcType ( Type, TcType, TcThetaType, TcPredType, TcTauType, TcTyVarSet,
+ SourceType(..), PredType, ThetaType,
+ tcSplitForAllTys, tcSplitForAllTys,
+ tcSplitMethodTy, tcSplitRhoTy, tcFunArgTy,
+ isIntTy,isFloatTy, isIntegerTy, isDoubleTy,
+ tcIsTyVarTy, mkPredTy, mkTyVarTy, mkTyVarTys,
+ tyVarsOfType, tyVarsOfTypes, tyVarsOfPred, tidyPred,
+ isClassPred, isTyVarClassPred, isLinearPred,
+ getClassPredTys, getClassPredTys_maybe, mkPredName,
+ tidyType, tidyTypes, tidyFreeTyVars,
+ tcCmpType, tcCmpTypes, tcCmpPred
)
import CoreFVs ( idFreeTyVars )
import Class ( Class )
-import Id ( Id, idName, idType, mkUserLocal, mkSysLocal, mkLocalId )
+import Id ( Id, idName, idType, mkUserLocal, mkSysLocal, mkLocalId, setIdUnique )
import PrelInfo ( isStandardClass, isCcallishClass, isNoDictClass )
import Name ( Name, mkMethodOcc, getOccName )
-import NameSet ( NameSet )
-import PprType ( pprPred )
-import Type ( Type, PredType(..), ThetaType,
- isTyVarTy, mkPredTy, mkTyVarTy, mkTyVarTys,
- splitForAllTys, splitSigmaTy, funArgTy,
- splitMethodTy, splitRhoTy,
- tyVarsOfType, tyVarsOfTypes, tyVarsOfPred, tidyPred,
- predMentionsIPs, isClassPred, isTyVarClassPred,
- getClassPredTys, getClassPredTys_maybe, mkPredName,
- tidyType, tidyTypes, tidyFreeTyVars
- )
+import PprType ( pprPred, pprParendType )
import Subst ( emptyInScopeSet, mkSubst,
- substTy, substTheta, mkTyVarSubst, mkTopTyVarSubst
+ substTy, substTyWith, substTheta, mkTyVarSubst, mkTopTyVarSubst
)
import Literal ( inIntRange )
import VarEnv ( TidyEnv, lookupSubstEnv, SubstResult(..) )
import VarSet ( elemVarSet, emptyVarSet, unionVarSet )
-import TysWiredIn ( isIntTy,
- floatDataCon, isFloatTy,
- doubleDataCon, isDoubleTy,
- isIntegerTy
- )
+import TysWiredIn ( floatDataCon, doubleDataCon )
import PrelNames( fromIntegerName, fromRationalName )
-import Util ( thenCmp, zipWithEqual )
+import Util ( thenCmp, equalLength )
+import BasicTypes( IPName(..), mapIPName, ipNameName )
+
import Bag
import Outputable
\end{code}
zonkLIE lie = mapBagNF_Tc zonkInst lie
pprInsts :: [Inst] -> SDoc
-pprInsts insts = parens (sep (punctuate comma (map pprInst insts)))
+pprInsts insts = parens (sep (punctuate comma (map pprInst insts)))
pprInstsInFull insts
EQ -> True
other -> False
-cmpInst (Dict _ pred1 _) (Dict _ pred2 _) = (pred1 `compare` pred2)
+cmpInst (Dict _ pred1 _) (Dict _ pred2 _) = pred1 `tcCmpPred` pred2
cmpInst (Dict _ _ _) other = LT
cmpInst (Method _ _ _ _ _ _) (Dict _ _ _) = GT
-cmpInst (Method _ id1 tys1 _ _ _) (Method _ id2 tys2 _ _ _) = (id1 `compare` id2) `thenCmp` (tys1 `compare` tys2)
+cmpInst (Method _ id1 tys1 _ _ _) (Method _ id2 tys2 _ _ _) = (id1 `compare` id2) `thenCmp` (tys1 `tcCmpTypes` tys2)
cmpInst (Method _ _ _ _ _ _) other = LT
-cmpInst (LitInst _ lit1 ty1 _) (LitInst _ lit2 ty2 _) = (lit1 `compare` lit2) `thenCmp` (ty1 `compare` ty2)
+cmpInst (LitInst _ lit1 ty1 _) (LitInst _ lit2 ty2 _) = (lit1 `compare` lit2) `thenCmp` (ty1 `tcCmpType` ty2)
cmpInst (LitInst _ _ _ _) other = GT
-- and they can only have HsInt or HsFracs in them.
instLoc (Method _ _ _ _ _ loc) = loc
instLoc (LitInst _ _ _ loc) = loc
+dictPred (Dict _ pred _ ) = pred
+dictPred inst = pprPanic "dictPred" (ppr inst)
+
getDictClassTys (Dict _ pred _) = getClassPredTys pred
predsOfInsts :: [Inst] -> [PredType]
-- But Num and Fractional have only one parameter and no functional
-- dependencies, so I think no caller of predsOfInst will care.
-ipsOfPreds theta = [(n,ty) | IParam n ty <- theta]
+ipNamesOfInsts :: [Inst] -> [Name]
+ipNamesOfInst :: Inst -> [Name]
+-- Get the implicit parameters mentioned by these Insts
+-- NB: ?x and %x get different Names
+
+ipNamesOfInsts insts = [n | inst <- insts, n <- ipNamesOfInst inst]
-getIPs inst = ipsOfPreds (predsOfInst inst)
+ipNamesOfInst (Dict _ (IParam n _) _) = [ipNameName n]
+ipNamesOfInst (Method _ _ _ theta _ _) = [ipNameName n | IParam n _ <- theta]
+ipNamesOfInst other = []
tyVarsOfInst :: Inst -> TcTyVarSet
tyVarsOfInst (LitInst _ _ ty _) = tyVarsOfType ty
isMethodFor ids (Method uniq id tys _ _ loc) = id `elemVarSet` ids
isMethodFor ids inst = False
-instMentionsIPs :: Inst -> NameSet -> Bool
- -- True if the Inst mentions any of the implicit
- -- parameters in the supplied set of names
-instMentionsIPs (Dict _ pred _) ip_names = pred `predMentionsIPs` ip_names
-instMentionsIPs (Method _ _ _ theta _ _) ip_names = any (`predMentionsIPs` ip_names) theta
-instMentionsIPs other ip_names = False
+isLinearInst :: Inst -> Bool
+isLinearInst (Dict _ pred _) = isLinearPred pred
+isLinearInst other = False
+ -- We never build Method Insts that have
+ -- linear implicit paramters in them.
+ -- Hence no need to look for Methods
+ -- See TcExpr.tcId
+
+linearInstType :: Inst -> TcType -- %x::t --> t
+linearInstType (Dict _ (IParam _ ty) _) = ty
+
isStdClassTyVarDict (Dict _ pred _) = case getClassPredTys_maybe pred of
- Just (clas, [ty]) -> isStandardClass clas && isTyVarTy ty
+ Just (clas, [ty]) -> isStandardClass clas && tcIsTyVarTy ty
other -> False
\end{code}
\begin{code}
instBindingRequired :: Inst -> Bool
instBindingRequired (Dict _ (ClassP clas _) _) = not (isNoDictClass clas)
-instBindingRequired (Dict _ (IParam _ _) _) = False
instBindingRequired other = True
instCanBeGeneralised :: Inst -> Bool
= tcGetInstLoc orig `thenNF_Tc` \ loc ->
newDictsAtLoc loc theta
+cloneDict :: Inst -> NF_TcM Inst
+cloneDict (Dict id ty loc) = tcGetUnique `thenNF_Tc` \ uniq ->
+ returnNF_Tc (Dict (setIdUnique id uniq) ty loc)
+
newDictsFromOld :: Inst -> TcThetaType -> NF_TcM [Inst]
newDictsFromOld (Dict _ _ loc) theta = newDictsAtLoc loc theta
-> TcThetaType
-> NF_TcM [Inst]
newDictsAtLoc inst_loc@(_,loc,_) theta
- = tcGetUniques (length theta) `thenNF_Tc` \ new_uniqs ->
- returnNF_Tc (zipWithEqual "newDictsAtLoc" mk_dict new_uniqs theta)
+ = tcGetUniques `thenNF_Tc` \ new_uniqs ->
+ returnNF_Tc (zipWith mk_dict new_uniqs theta)
where
mk_dict uniq pred = Dict (mkLocalId (mkPredName uniq loc pred) (mkPredTy pred)) pred inst_loc
--- For implicit parameters, since there is only one in scope
--- at any time, we use the name of the implicit parameter itself
-newIPDict orig name ty
- = tcGetInstLoc orig `thenNF_Tc` \ inst_loc ->
- returnNF_Tc (Dict (mkLocalId name (mkPredTy pred)) pred inst_loc)
- where pred = IParam name ty
+-- For vanilla implicit parameters, there is only one in scope
+-- at any time, so we used to use the name of the implicit parameter itself
+-- But with splittable implicit parameters there may be many in
+-- scope, so we make up a new name.
+newIPDict :: InstOrigin -> IPName Name -> Type
+ -> NF_TcM (IPName Id, Inst)
+newIPDict orig ip_name ty
+ = tcGetInstLoc orig `thenNF_Tc` \ inst_loc@(_,loc,_) ->
+ tcGetUnique `thenNF_Tc` \ uniq ->
+ let
+ pred = IParam ip_name ty
+ id = mkLocalId (mkPredName uniq loc pred) (mkPredTy pred)
+ in
+ returnNF_Tc (mapIPName (\n -> id) ip_name, Dict id pred inst_loc)
\end{code}
%* *
%************************************************************************
-tcInstId instantiates an occurrence of an Id.
-The instantiate_it loop runs round instantiating the Id.
-It has to be a loop because we are now prepared to entertain
-types like
- f:: forall a. Eq a => forall b. Baz b => tau
-We want to instantiate this to
- f2::tau {f2 = f1 b (Baz b), f1 = f a (Eq a)}
-
-The -fno-method-sharing flag controls what happens so far as the LIE
-is concerned. The default case is that for an overloaded function we
-generate a "method" Id, and add the Method Inst to the LIE. So you get
-something like
- f :: Num a => a -> a
- f = /\a (d:Num a) -> let m = (+) a d in \ (x:a) -> m x x
-If you specify -fno-method-sharing, the dictionary application
-isn't shared, so we get
- f :: Num a => a -> a
- f = /\a (d:Num a) (x:a) -> (+) a d x x
-This gets a bit less sharing, but
- a) it's better for RULEs involving overloaded functions
- b) perhaps fewer separated lambdas
-
\begin{code}
-tcInstId :: Id -> NF_TcM (TcExpr, LIE, TcType)
-tcInstId fun
- | opt_NoMethodSharing = loop_noshare (HsVar fun) (idType fun)
- | otherwise = loop_share fun
- where
- orig = OccurrenceOf fun
- loop_noshare fun fun_ty
- = tcInstType fun_ty `thenNF_Tc` \ (tyvars, theta, tau) ->
- let
- ty_app = mkHsTyApp fun (mkTyVarTys tyvars)
- in
- if null theta then -- Is it overloaded?
- returnNF_Tc (ty_app, emptyLIE, tau)
- else
- newDicts orig theta `thenNF_Tc` \ dicts ->
- loop_noshare (mkHsDictApp ty_app (map instToId dicts)) tau `thenNF_Tc` \ (expr, lie, final_tau) ->
- returnNF_Tc (expr, mkLIE dicts `plusLIE` lie, final_tau)
-
- loop_share fun
- = tcInstType (idType fun) `thenNF_Tc` \ (tyvars, theta, tau) ->
- let
- arg_tys = mkTyVarTys tyvars
- in
- if null theta then -- Is it overloaded?
- returnNF_Tc (mkHsTyApp (HsVar fun) arg_tys, emptyLIE, tau)
- else
- -- Yes, it's overloaded
- newMethodWithGivenTy orig fun arg_tys theta tau `thenNF_Tc` \ meth ->
- loop_share (instToId meth) `thenNF_Tc` \ (expr, lie, final_tau) ->
- returnNF_Tc (expr, unitLIE meth `plusLIE` lie, final_tau)
-
+tcInstCall :: InstOrigin -> TcType -> NF_TcM (TypecheckedHsExpr -> TypecheckedHsExpr, LIE, TcType)
+tcInstCall orig fun_ty -- fun_ty is usually a sigma-type
+ = tcInstType fun_ty `thenNF_Tc` \ (tyvars, theta, tau) ->
+ newDicts orig theta `thenNF_Tc` \ dicts ->
+ let
+ inst_fn e = mkHsDictApp (mkHsTyApp e (mkTyVarTys tyvars)) (map instToId dicts)
+ in
+ returnNF_Tc (inst_fn, mkLIE dicts, tau)
newMethod :: InstOrigin
-> TcId
newMethod orig id tys
= -- Get the Id type and instantiate it at the specified types
let
- (tyvars, rho) = splitForAllTys (idType id)
- rho_ty = substTy (mkTyVarSubst tyvars tys) rho
- (pred, tau) = splitMethodTy rho_ty
+ (tyvars, rho) = tcSplitForAllTys (idType id)
+ rho_ty = substTyWith tyvars tys rho
+ (pred, tau) = tcSplitMethodTy rho_ty
in
newMethodWithGivenTy orig id tys [pred] tau
-- This actually builds the Inst
= -- Get the Id type and instantiate it at the specified types
let
- (tyvars,rho) = splitForAllTys (idType real_id)
- rho_ty = ASSERT( length tyvars == length tys )
+ (tyvars,rho) = tcSplitForAllTys (idType real_id)
+ rho_ty = ASSERT( equalLength tyvars tys )
substTy (mkTopTyVarSubst tyvars tys) rho
- (theta, tau) = splitRhoTy rho_ty
+ (theta, tau) = tcSplitRhoTy rho_ty
in
newMethodWith inst_loc real_id tys theta tau `thenNF_Tc` \ meth_inst ->
returnNF_Tc (meth_inst, instToId meth_inst)
-> HsOverLit
-> TcType
-> NF_TcM (TcExpr, LIE)
-newOverloadedLit orig (HsIntegral i) ty
- | isIntTy ty && inIntRange i -- Short cut for Int
- = returnNF_Tc (int_lit, emptyLIE)
-
- | isIntegerTy ty -- Short cut for Integer
- = returnNF_Tc (integer_lit, emptyLIE)
-
- where
- int_lit = HsLit (HsInt i)
- integer_lit = HsLit (HsInteger i)
+newOverloadedLit orig lit ty
+ | Just expr <- shortCutLit lit ty
+ = returnNF_Tc (expr, emptyLIE)
-newOverloadedLit orig lit ty -- The general case
+ | otherwise
= tcGetInstLoc orig `thenNF_Tc` \ loc ->
tcGetUnique `thenNF_Tc` \ new_uniq ->
let
lit_id = mkSysLocal SLIT("lit") new_uniq ty
in
returnNF_Tc (HsVar (instToId lit_inst), unitLIE lit_inst)
+
+shortCutLit :: HsOverLit -> TcType -> Maybe TcExpr
+shortCutLit (HsIntegral i fi) ty
+ | isIntTy ty && inIntRange i && fi == fromIntegerName -- Short cut for Int
+ = Just (HsLit (HsInt i))
+ | isIntegerTy ty && fi == fromIntegerName -- Short cut for Integer
+ = Just (HsLit (HsInteger i))
+
+shortCutLit (HsFractional f fr) ty
+ | isFloatTy ty && fr == fromRationalName
+ = Just (mkHsConApp floatDataCon [] [HsLit (HsFloatPrim f)])
+ | isDoubleTy ty && fr == fromRationalName
+ = Just (mkHsConApp doubleDataCon [] [HsLit (HsDoublePrim f)])
+
+shortCutLit lit ty
+ = Nothing
\end{code}
pprInst m@(Method u id tys theta tau loc)
= hsep [ppr id, ptext SLIT("at"),
- brackets (interppSP tys) {- ,
+ brackets (sep (map pprParendType tys)) {- ,
ptext SLIT("theta"), ppr theta,
ptext SLIT("tau"), ppr tau
show_uniq u,
tidyInst env (Dict u pred loc) = Dict u (tidyPred env pred) loc
tidyInst env (Method u id tys theta tau loc) = Method u id (tidyTypes env tys) theta tau loc
-tidyInsts :: [Inst] -> (TidyEnv, [Inst])
+tidyMoreInsts :: TidyEnv -> [Inst] -> (TidyEnv, [Inst])
-- This function doesn't assume that the tyvars are in scope
-- so it works like tidyOpenType, returning a TidyEnv
-tidyInsts insts
- = (env, map (tidyInst env) insts)
+tidyMoreInsts env insts
+ = (env', map (tidyInst env') insts)
where
- env = tidyFreeTyVars emptyTidyEnv (tyVarsOfInsts insts)
+ env' = tidyFreeTyVars env (tyVarsOfInsts insts)
+
+tidyInsts :: [Inst] -> (TidyEnv, [Inst])
+tidyInsts insts = tidyMoreInsts emptyTidyEnv insts
\end{code}
-- Dictionaries
lookupInst dict@(Dict _ (ClassP clas tys) loc)
- = tcGetInstEnv `thenNF_Tc` \ inst_env ->
- case lookupInstEnv inst_env clas tys of
+ = getDOptsTc `thenNF_Tc` \ dflags ->
+ tcGetInstEnv `thenNF_Tc` \ inst_env ->
+ case lookupInstEnv dflags inst_env clas tys of
FoundInst tenv dfun_id
-> let
- (tyvars, rho) = splitForAllTys (idType dfun_id)
+ (tyvars, rho) = tcSplitForAllTys (idType dfun_id)
mk_ty_arg tv = case lookupSubstEnv tenv tv of
Just (DoneTy ty) -> returnNF_Tc ty
Nothing -> tcInstTyVar tv `thenNF_Tc` \ tc_tv ->
returnTc (mkTyVarTy tc_tv)
in
+ -- It's possible that not all the tyvars are in
+ -- the substitution, tenv. For example:
+ -- instance C X a => D X where ...
+ -- (presumably there's a functional dependency in class C)
+ -- Hence the mk_ty_arg to instantiate any un-substituted tyvars.
mapNF_Tc mk_ty_arg tyvars `thenNF_Tc` \ ty_args ->
let
- subst = mkTyVarSubst tyvars ty_args
- dfun_rho = substTy subst rho
- (theta, _) = splitRhoTy dfun_rho
- ty_app = mkHsTyApp (HsVar dfun_id) ty_args
+ dfun_rho = substTy (mkTyVarSubst tyvars ty_args) rho
+ (theta, _) = tcSplitRhoTy dfun_rho
+ ty_app = mkHsTyApp (HsVar dfun_id) ty_args
in
if null theta then
returnNF_Tc (SimpleInst ty_app)
-- Literals
-lookupInst inst@(LitInst u (HsIntegral i) ty loc)
- | isIntTy ty && in_int_range -- Short cut for Int
- = returnNF_Tc (GenInst [] int_lit)
- -- GenInst, not SimpleInst, because int_lit is actually a constructor application
+-- Look for short cuts first: if the literal is *definitely* a
+-- int, integer, float or a double, generate the real thing here.
+-- This is essential (see nofib/spectral/nucleic).
+-- [Same shortcut as in newOverloadedLit, but we
+-- may have done some unification by now]
- | isIntegerTy ty -- Short cut for Integer
- = returnNF_Tc (GenInst [] integer_lit)
+lookupInst inst@(LitInst u lit ty loc)
+ | Just expr <- shortCutLit lit ty
+ = returnNF_Tc (GenInst [] expr) -- GenInst, not SimpleInst, because
+ -- expr may be a constructor application
- | otherwise -- Alas, it is overloaded and a big literal!
- = tcLookupSyntaxId fromIntegerName `thenNF_Tc` \ from_integer ->
+lookupInst inst@(LitInst u (HsIntegral i from_integer_name) ty loc)
+ = tcLookupId from_integer_name `thenNF_Tc` \ from_integer ->
newMethodAtLoc loc from_integer [ty] `thenNF_Tc` \ (method_inst, method_id) ->
- returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) integer_lit))
- where
- in_int_range = inIntRange i
- integer_lit = HsLit (HsInteger i)
- int_lit = HsLit (HsInt i)
-
--- similar idea for overloaded floating point literals: if the literal is
--- *definitely* a float or a double, generate the real thing here.
--- This is essential (see nofib/spectral/nucleic).
+ returnNF_Tc (GenInst [method_inst]
+ (HsApp (HsVar method_id) (HsLit (HsInteger i))))
-lookupInst inst@(LitInst u (HsFractional f) ty loc)
- | isFloatTy ty = returnNF_Tc (GenInst [] float_lit)
- | isDoubleTy ty = returnNF_Tc (GenInst [] double_lit)
- | otherwise
- = tcLookupSyntaxId fromRationalName `thenNF_Tc` \ from_rational ->
+lookupInst inst@(LitInst u (HsFractional f from_rat_name) ty loc)
+ = tcLookupId from_rat_name `thenNF_Tc` \ from_rational ->
newMethodAtLoc loc from_rational [ty] `thenNF_Tc` \ (method_inst, method_id) ->
let
- rational_ty = funArgTy (idType method_id)
+ rational_ty = tcFunArgTy (idType method_id)
rational_lit = HsLit (HsRat f rational_ty)
in
returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) rational_lit))
-
- where
- floatprim_lit = HsLit (HsFloatPrim f)
- float_lit = mkHsConApp floatDataCon [] [floatprim_lit]
- doubleprim_lit = HsLit (HsDoublePrim f)
- double_lit = mkHsConApp doubleDataCon [] [doubleprim_lit]
\end{code}
There is a second, simpler interface, when you want an instance of a
\begin{code}
lookupSimpleInst :: Class
- -> [Type] -- Look up (c,t)
+ -> [Type] -- Look up (c,t)
-> NF_TcM (Maybe ThetaType) -- Here are the needed (c,t)s
lookupSimpleInst clas tys
- = tcGetInstEnv `thenNF_Tc` \ inst_env ->
- case lookupInstEnv inst_env clas tys of
+ = getDOptsTc `thenNF_Tc` \ dflags ->
+ tcGetInstEnv `thenNF_Tc` \ inst_env ->
+ case lookupInstEnv dflags inst_env clas tys of
FoundInst tenv dfun
-> returnNF_Tc (Just (substTheta (mkSubst emptyInScopeSet tenv) theta))
where
- (_, theta, _) = splitSigmaTy (idType dfun)
+ (_, rho) = tcSplitForAllTys (idType dfun)
+ (theta,_) = tcSplitRhoTy rho
other -> returnNF_Tc Nothing
\end{code}
-
-
projects / ghc-hetmet.git / blobdiff