import Coercion
import Var
import VarSet
+import VarEnv
import TysWiredIn
import TysPrim( intPrimTy )
import PrimOp( tagToEnumKey )
import Util
import ListSetOps
import Maybes
+import ErrUtils
import Outputable
import FastString
import Control.Monad
; co_res <- unifyType op_res_ty res_ty
; op_id <- tcLookupId op_name
; let op' = L loc (HsWrap (mkWpTyApps [arg2_ty, op_res_ty]) (HsVar op_id))
- ; return $ mkHsWrapCoI co_res $
- OpApp (mkLHsWrapCoI co_arg1 arg1') op' fix arg2' }
+ ; return $ mkHsWrapCo co_res $
+ OpApp (mkLHsWrapCo co_arg1 arg1') op' fix arg2' }
| otherwise
= do { traceTc "Non Application rule" (ppr op)
; (co_fn, arg_tys, op_res_ty) <- unifyOpFunTys op 2 op_ty
; co_res <- unifyType op_res_ty res_ty
; [arg1', arg2'] <- tcArgs op [arg1, arg2] arg_tys
- ; return $ mkHsWrapCoI co_res $
- OpApp arg1' (mkLHsWrapCoI co_fn op') fix arg2' }
+ ; return $ mkHsWrapCo co_res $
+ OpApp arg1' (mkLHsWrapCo co_fn op') fix arg2' }
-- Right sections, equivalent to \ x -> x `op` expr, or
-- \ x -> op x expr
; (co_fn, [arg1_ty, arg2_ty], op_res_ty) <- unifyOpFunTys op 2 op_ty
; co_res <- unifyType (mkFunTy arg1_ty op_res_ty) res_ty
; arg2' <- tcArg op (arg2, arg2_ty, 2)
- ; return $ mkHsWrapCoI co_res $
- SectionR (mkLHsWrapCoI co_fn op') arg2' }
+ ; return $ mkHsWrapCo co_res $
+ SectionR (mkLHsWrapCo co_fn op') arg2' }
tcExpr (SectionL arg1 op) res_ty
= do { (op', op_ty) <- tcInferFun op
; (co_fn, (arg1_ty:arg_tys), op_res_ty) <- unifyOpFunTys op n_reqd_args op_ty
; co_res <- unifyType (mkFunTys arg_tys op_res_ty) res_ty
; arg1' <- tcArg op (arg1, arg1_ty, 1)
- ; return $ mkHsWrapCoI co_res $
- SectionL arg1' (mkLHsWrapCoI co_fn op') }
+ ; return $ mkHsWrapCo co_res $
+ SectionL arg1' (mkLHsWrapCo co_fn op') }
tcExpr (ExplicitTuple tup_args boxity) res_ty
| all tupArgPresent tup_args
= do { let tup_tc = tupleTyCon boxity (length tup_args)
; (coi, arg_tys) <- matchExpectedTyConApp tup_tc res_ty
; tup_args1 <- tcTupArgs tup_args arg_tys
- ; return $ mkHsWrapCoI coi (ExplicitTuple tup_args1 boxity) }
+ ; return $ mkHsWrapCo coi (ExplicitTuple tup_args1 boxity) }
| otherwise
= -- The tup_args are a mixture of Present and Missing (for tuple sections)
-- Handle tuple sections where
; tup_args1 <- tcTupArgs tup_args arg_tys
- ; return $ mkHsWrapCoI coi (ExplicitTuple tup_args1 boxity) }
+ ; return $ mkHsWrapCo coi (ExplicitTuple tup_args1 boxity) }
tcExpr (ExplicitList _ exprs) res_ty
= do { (coi, elt_ty) <- matchExpectedListTy res_ty
; exprs' <- mapM (tc_elt elt_ty) exprs
- ; return $ mkHsWrapCoI coi (ExplicitList elt_ty exprs') }
+ ; return $ mkHsWrapCo coi (ExplicitList elt_ty exprs') }
where
tc_elt elt_ty expr = tcPolyExpr expr elt_ty
tcExpr (ExplicitPArr _ exprs) res_ty -- maybe empty
= do { (coi, elt_ty) <- matchExpectedPArrTy res_ty
; exprs' <- mapM (tc_elt elt_ty) exprs
- ; return $ mkHsWrapCoI coi (ExplicitPArr elt_ty exprs') }
+ ; return $ mkHsWrapCo coi (ExplicitPArr elt_ty exprs') }
where
tc_elt elt_ty expr = tcPolyExpr expr elt_ty
\end{code}
-- and it maintains uniformity with other rebindable syntax
; return (HsIf (Just fun') pred' b1' b2') }
-tcExpr (HsDo do_or_lc stmts body _) res_ty
- = tcDoStmts do_or_lc stmts body res_ty
+tcExpr (HsDo do_or_lc stmts _) res_ty
+ = tcDoStmts do_or_lc stmts res_ty
tcExpr (HsProc pat cmd) res_ty
= do { (pat', cmd', coi) <- tcProc pat cmd res_ty
- ; return $ mkHsWrapCoI coi (HsProc pat' cmd') }
+ ; return $ mkHsWrapCo coi (HsProc pat' cmd') }
tcExpr e@(HsArrApp _ _ _ _ _) _
= failWithTc (vcat [ptext (sLit "The arrow command"), nest 2 (ppr e),
; co_res <- unifyType actual_res_ty res_ty
; rbinds' <- tcRecordBinds data_con arg_tys rbinds
- ; return $ mkHsWrapCoI co_res $
+ ; return $ mkHsWrapCo co_res $
RecordCon (L loc con_id) con_expr rbinds' }
\end{code}
-- Take apart a representative constructor
con1 = ASSERT( not (null relevant_cons) ) head relevant_cons
- (con1_tvs, _, _, _, _, con1_arg_tys, _) = dataConFullSig con1
+ (con1_tvs, _, _, _, con1_arg_tys, _) = dataConFullSig con1
con1_flds = dataConFieldLabels con1
con1_res_ty = mkFamilyTyConApp tycon (mkTyVarTys con1_tvs)
; (_, result_inst_tys, result_inst_env) <- tcInstTyVars con1_tvs
; scrut_inst_tys <- zipWithM mk_inst_ty con1_tvs result_inst_tys
- ; let rec_res_ty = substTy result_inst_env con1_res_ty
- con1_arg_tys' = map (substTy result_inst_env) con1_arg_tys
+ ; let rec_res_ty = TcType.substTy result_inst_env con1_res_ty
+ con1_arg_tys' = map (TcType.substTy result_inst_env) con1_arg_tys
scrut_subst = zipTopTvSubst con1_tvs scrut_inst_tys
- scrut_ty = substTy scrut_subst con1_res_ty
+ scrut_ty = TcType.substTy scrut_subst con1_res_ty
; co_res <- unifyType rec_res_ty res_ty
-- Step 7: make a cast for the scrutinee, in the case that it's from a type family
; let scrut_co | Just co_con <- tyConFamilyCoercion_maybe tycon
- = WpCast $ mkTyConApp co_con scrut_inst_tys
+ = WpCast $ mkAxInstCo co_con scrut_inst_tys
| otherwise
= idHsWrapper
-- Phew!
- ; return $ mkHsWrapCoI co_res $
+ ; return $ mkHsWrapCo co_res $
RecordUpd (mkLHsWrap scrut_co record_expr') rbinds'
relevant_cons scrut_inst_tys result_inst_tys }
where
; expr' <- tcPolyExpr expr elt_ty
; enum_from <- newMethodFromName (ArithSeqOrigin seq)
enumFromName elt_ty
- ; return $ mkHsWrapCoI coi (ArithSeq enum_from (From expr')) }
+ ; return $ mkHsWrapCo coi (ArithSeq enum_from (From expr')) }
tcExpr (ArithSeq _ seq@(FromThen expr1 expr2)) res_ty
= do { (coi, elt_ty) <- matchExpectedListTy res_ty
; expr2' <- tcPolyExpr expr2 elt_ty
; enum_from_then <- newMethodFromName (ArithSeqOrigin seq)
enumFromThenName elt_ty
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(ArithSeq enum_from_then (FromThen expr1' expr2')) }
tcExpr (ArithSeq _ seq@(FromTo expr1 expr2)) res_ty
; expr2' <- tcPolyExpr expr2 elt_ty
; enum_from_to <- newMethodFromName (ArithSeqOrigin seq)
enumFromToName elt_ty
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(ArithSeq enum_from_to (FromTo expr1' expr2')) }
tcExpr (ArithSeq _ seq@(FromThenTo expr1 expr2 expr3)) res_ty
; expr3' <- tcPolyExpr expr3 elt_ty
; eft <- newMethodFromName (ArithSeqOrigin seq)
enumFromThenToName elt_ty
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(ArithSeq eft (FromThenTo expr1' expr2' expr3')) }
tcExpr (PArrSeq _ seq@(FromTo expr1 expr2)) res_ty
; expr2' <- tcPolyExpr expr2 elt_ty
; enum_from_to <- newMethodFromName (PArrSeqOrigin seq)
(enumFromToPName basePackageId) elt_ty -- !!!FIXME: chak
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(PArrSeq enum_from_to (FromTo expr1' expr2')) }
tcExpr (PArrSeq _ seq@(FromThenTo expr1 expr2 expr3)) res_ty
; expr3' <- tcPolyExpr expr3 elt_ty
; eft <- newMethodFromName (PArrSeqOrigin seq)
(enumFromThenToPName basePackageId) elt_ty -- !!!FIXME: chak
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(PArrSeq eft (FromThenTo expr1' expr2' expr3')) }
tcExpr (PArrSeq _ _) _
-- Typecheck the result, thereby propagating
-- info (if any) from result into the argument types
-- Both actual_res_ty and res_ty are deeply skolemised
- ; co_res <- addErrCtxt (funResCtxt fun) $
+ ; co_res <- addErrCtxtM (funResCtxt fun actual_res_ty res_ty) $
unifyType actual_res_ty res_ty
-- Typecheck the arguments
; args1 <- tcArgs fun args expected_arg_tys
-- Assemble the result
- ; let fun2 = mkLHsWrapCoI co_fun fun1
- app = mkLHsWrapCoI co_res (foldl mkHsApp fun2 args1)
+ ; let fun2 = mkLHsWrapCo co_fun fun1
+ app = mkLHsWrapCo co_res (foldl mkHsApp fun2 args1)
; return (unLoc app) }
; (co_fun, expected_arg_tys, actual_res_ty)
<- matchExpectedFunTys (mk_app_msg fun) (length args) fun_tau
; args1 <- tcArgs fun args expected_arg_tys
- ; let fun2 = mkLHsWrapCoI co_fun fun1
+ ; let fun2 = mkLHsWrapCo co_fun fun1
app = foldl mkHsApp fun2 args1
; return (unLoc app, actual_res_ty) }
----------------
unifyOpFunTys :: LHsExpr Name -> Arity -> TcRhoType
- -> TcM (CoercionI, [TcSigmaType], TcRhoType)
+ -> TcM (Coercion, [TcSigmaType], TcRhoType)
-- A wrapper for matchExpectedFunTys
unifyOpFunTys op arity ty = matchExpectedFunTys herald arity ty
where
; let theta' = substTheta subst theta
; traceTc "Instantiating" (ppr id <+> text "with" <+> (ppr tys $$ ppr theta'))
; wrap <- instCall orig tys theta'
- ; return (mkHsWrap wrap (HsVar id), substTy subst tau) }
+ ; return (mkHsWrap wrap (HsVar id), TcType.substTy subst tau) }
where
(tvs, theta, tau) = tcSplitSigmaTy (idType id)
\end{code}
; let fun' = L loc (HsWrap (WpTyApp rep_ty) (HsVar fun))
rep_ty = mkTyConApp rep_tc rep_args
- ; return (mkHsWrapCoI coi $ HsApp fun' arg') }
+ ; return (mkHsWrapCo coi $ HsApp fun' arg') }
where
doc1 = vcat [ ptext (sLit "Specify the type by giving a type signature")
, ptext (sLit "e.g. (tagToEnum# x) :: Bool") ]
doc3 = ptext (sLit "No family instance for this type")
get_rep_ty :: TcType -> TyCon -> [TcType]
- -> TcM (CoercionI, TyCon, [TcType])
+ -> TcM (Coercion, TyCon, [TcType])
-- Converts a family type (eg F [a]) to its rep type (eg FList a)
-- and returns a coercion between the two
get_rep_ty ty tc tc_args
| not (isFamilyTyCon tc)
- = return (IdCo ty, tc, tc_args)
+ = return (mkReflCo ty, tc, tc_args)
| otherwise
= do { mb_fam <- tcLookupFamInst tc tc_args
; case mb_fam of
Nothing -> failWithTc (tagToEnumError ty doc3)
Just (rep_tc, rep_args)
- -> return ( ACo (mkSymCoercion (mkTyConApp co_tc rep_args))
+ -> return ( mkSymCo (mkAxInstCo co_tc rep_args)
, rep_tc, rep_args )
where
co_tc = expectJust "tcTagToEnum" $
quotes (ppr fun) <> text ", namely"])
2 (quotes (ppr arg))
-funResCtxt :: LHsExpr Name -> SDoc
-funResCtxt fun
- = ptext (sLit "In the return type of a call of") <+> quotes (ppr fun)
+funResCtxt :: LHsExpr Name -> TcType -> TcType
+ -> TidyEnv -> TcM (TidyEnv, Message)
+-- When we have a mis-match in the return type of a function
+-- try to give a helpful message about too many/few arguments
+funResCtxt fun fun_res_ty res_ty env0
+ = do { fun_res' <- zonkTcType fun_res_ty
+ ; res' <- zonkTcType res_ty
+ ; let n_fun = length (fst (tcSplitFunTys fun_res'))
+ n_res = length (fst (tcSplitFunTys res'))
+ what | n_fun > n_res = ptext (sLit "few")
+ | otherwise = ptext (sLit "many")
+ extra | n_fun == n_res = empty
+ | otherwise = ptext (sLit "Probable cause:") <+> quotes (ppr fun)
+ <+> ptext (sLit "is applied to too") <+> what
+ <+> ptext (sLit "arguments")
+ msg = ptext (sLit "In the return type of a call of") <+> quotes (ppr fun)
+ ; return (env0, msg $$ extra) }
badFieldTypes :: [(Name,TcType)] -> SDoc
badFieldTypes prs
projects / ghc-hetmet.git / blobdiff