\section[RnSource]{Main pass of renamer}
\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 RnTypes (
-- Type related stuff
rnHsType, rnLHsType, rnLHsTypes, rnContext,
import DynFlags
import HsSyn
import RdrHsSyn ( extractHsRhoRdrTyVars )
-import RnHsSyn ( extractHsTyNames, parrTyCon_name, tupleTyCon_name,
- listTyCon_name
- )
+import RnHsSyn ( extractHsTyNames )
import RnHsDoc ( rnLHsDoc )
-import RnEnv ( lookupOccRn, lookupBndrRn, lookupSyntaxName,
- lookupLocatedOccRn, lookupLocatedBndrRn,
- lookupLocatedGlobalOccRn, bindTyVarsRn,
- lookupFixityRn, lookupTyFixityRn, lookupConstructorFields,
- lookupRecordBndr, mapFvRn,
- newIPNameRn, bindPatSigTyVarsFV)
+import RnEnv
import TcRnMonad
import RdrName
-import PrelNames ( eqClassName, integralClassName, geName, eqName,
- negateName, minusName, lengthPName, indexPName,
- plusIntegerName, fromIntegerName, timesIntegerName,
- ratioDataConName, fromRationalName, fromStringName )
-import TypeRep ( funTyCon )
-import Constants ( mAX_TUPLE_SIZE )
+import PrelNames
+import TypeRep ( funTyConName )
import Name
import SrcLoc
import NameSet
-import Literal ( inIntRange, inCharRange )
import BasicTypes ( compareFixity, funTyFixity, negateFixity,
Fixity(..), FixityDirection(..) )
-import ListSetOps ( removeDups, minusList )
import Outputable
+import FastString
+import Control.Monad ( unless )
#include "HsVersions.h"
\end{code}
mapM_ (forAllWarn doc tau) warn_guys
rnForAll doc Explicit forall_tyvars ctxt tau
-rnHsType doc (HsTyVar tyvar) = do
+rnHsType _ (HsTyVar tyvar) = do
tyvar' <- lookupOccRn tyvar
return (HsTyVar tyvar')
+-- If we see (forall a . ty), without foralls on, the forall will give
+-- a sensible error message, but we don't want to complain about the dot too
+-- Hence the jiggery pokery with ty1
rnHsType doc ty@(HsOpTy ty1 (L loc op) ty2)
= setSrcSpan loc $
- do { ty_ops_ok <- doptM Opt_TypeOperators
- ; checkErr ty_ops_ok (opTyErr op ty)
- ; op' <- lookupOccRn op
+ do { ops_ok <- doptM Opt_TypeOperators
+ ; op' <- if ops_ok
+ then lookupOccRn op
+ else do { addErr (opTyErr op ty)
+ ; return (mkUnboundName op) } -- Avoid double complaint
; let l_op' = L loc op'
; fix <- lookupTyFixityRn l_op'
; ty1' <- rnLHsType doc ty1
; ty2' <- rnLHsType doc ty2
- ; mkHsOpTyRn (\t1 t2 -> HsOpTy t1 l_op' t2) (ppr op') fix ty1' ty2' }
+ ; mkHsOpTyRn (\t1 t2 -> HsOpTy t1 l_op' t2) op' fix ty1' ty2' }
rnHsType doc (HsParTy ty) = do
ty' <- rnLHsType doc ty
ty' <- rnLHsType doc ty
return (HsBangTy b ty')
-rnHsType doc (HsNumTy i)
+rnHsType _ (HsNumTy i)
| i == 1 = return (HsNumTy i)
| otherwise = addErr err_msg >> return (HsNumTy i)
where
- err_msg = ptext SLIT("Only unit numeric type pattern is valid")
+ err_msg = ptext (sLit "Only unit numeric type pattern is valid")
rnHsType doc (HsFunTy ty1 ty2) = do
-- when we find return :: forall m. Monad m -> forall a. a -> m a
-- Check for fixity rearrangements
- mkHsOpTyRn HsFunTy (ppr funTyCon) funTyFixity ty1' ty2'
+ mkHsOpTyRn HsFunTy funTyConName funTyFixity ty1' ty2'
rnHsType doc (HsListTy ty) = do
ty' <- rnLHsType doc ty
pred' <- rnPred doc pred
return (HsPredTy pred')
-rnHsType doc (HsSpliceTy _) = do
- addErr (ptext SLIT("Type splices are not yet implemented"))
- failM
+rnHsType _ (HsSpliceTy _) =
+ failWith (ptext (sLit "Type splices are not yet implemented"))
rnHsType doc (HsDocTy ty haddock_doc) = do
ty' <- rnLHsType doc ty
haddock_doc' <- rnLHsDoc haddock_doc
return (HsDocTy ty' haddock_doc')
+rnLHsTypes :: SDoc -> [LHsType RdrName]
+ -> IOEnv (Env TcGblEnv TcLclEnv) [LHsType Name]
rnLHsTypes doc tys = mapM (rnLHsType doc) tys
\end{code}
rnForAll :: SDoc -> HsExplicitForAll -> [LHsTyVarBndr RdrName]
-> LHsContext RdrName -> LHsType RdrName -> RnM (HsType Name)
-rnForAll doc exp [] (L _ []) (L _ ty) = rnHsType doc ty
+rnForAll doc _ [] (L _ []) (L _ ty) = rnHsType doc ty
-- One reason for this case is that a type like Int#
-- starts off as (HsForAllTy Nothing [] Int), in case
-- there is some quantification. Now that we have quantified
rnLPred :: SDoc -> LHsPred RdrName -> RnM (LHsPred Name)
rnLPred doc = wrapLocM (rnPred doc)
+rnPred :: SDoc -> HsPred RdrName
+ -> IOEnv (Env TcGblEnv TcLclEnv) (HsPred Name)
rnPred doc (HsClassP clas tys)
= do { clas_name <- lookupOccRn clas
; tys' <- rnLHsTypes doc tys
---------------
-- Building (ty1 `op1` (ty21 `op2` ty22))
mkHsOpTyRn :: (LHsType Name -> LHsType Name -> HsType Name)
- -> SDoc -> Fixity -> LHsType Name -> LHsType Name
+ -> Name -> Fixity -> LHsType Name -> LHsType Name
-> RnM (HsType Name)
mkHsOpTyRn mk1 pp_op1 fix1 ty1 (L loc2 (HsOpTy ty21 op2 ty22))
= do { fix2 <- lookupTyFixityRn op2
; mk_hs_op_ty mk1 pp_op1 fix1 ty1
(\t1 t2 -> HsOpTy t1 op2 t2)
- (ppr op2) fix2 ty21 ty22 loc2 }
+ (unLoc op2) fix2 ty21 ty22 loc2 }
-mkHsOpTyRn mk1 pp_op1 fix1 ty1 ty2@(L loc2 (HsFunTy ty21 ty22))
+mkHsOpTyRn mk1 pp_op1 fix1 ty1 (L loc2 (HsFunTy ty21 ty22))
= mk_hs_op_ty mk1 pp_op1 fix1 ty1
- HsFunTy (ppr funTyCon) funTyFixity ty21 ty22 loc2
+ HsFunTy funTyConName funTyFixity ty21 ty22 loc2
-mkHsOpTyRn mk1 pp_op1 fix1 ty1 ty2 -- Default case, no rearrangment
+mkHsOpTyRn mk1 _ _ ty1 ty2 -- Default case, no rearrangment
= return (mk1 ty1 ty2)
---------------
mk_hs_op_ty :: (LHsType Name -> LHsType Name -> HsType Name)
- -> SDoc -> Fixity -> LHsType Name
+ -> Name -> Fixity -> LHsType Name
-> (LHsType Name -> LHsType Name -> HsType Name)
- -> SDoc -> Fixity -> LHsType Name -> LHsType Name -> SrcSpan
+ -> Name -> Fixity -> LHsType Name -> LHsType Name -> SrcSpan
-> RnM (HsType Name)
-mk_hs_op_ty mk1 pp_op1 fix1 ty1
- mk2 pp_op2 fix2 ty21 ty22 loc2
- | nofix_error = do { addErr (precParseErr (quotes pp_op1,fix1)
- (quotes pp_op2,fix2))
+mk_hs_op_ty mk1 op1 fix1 ty1
+ mk2 op2 fix2 ty21 ty22 loc2
+ | nofix_error = do { precParseErr (op1,fix1) (op2,fix2)
; return (mk1 ty1 (L loc2 (mk2 ty21 ty22))) }
| associate_right = return (mk1 ty1 (L loc2 (mk2 ty21 ty22)))
| otherwise = do { -- Rearrange to ((ty1 `op1` ty21) `op2` ty22)
- new_ty <- mkHsOpTyRn mk1 pp_op1 fix1 ty1 ty21
+ new_ty <- mkHsOpTyRn mk1 op1 fix1 ty1 ty21
; return (mk2 (noLoc new_ty) ty22) }
where
(nofix_error, associate_right) = compareFixity fix1 fix2
-- (e11 `op1` e12) `op2` e2
mkOpAppRn e1@(L _ (OpApp e11 op1 fix1 e12)) op2 fix2 e2
- | nofix_error = do
- addErr (precParseErr (ppr_op op1,fix1) (ppr_op op2,fix2))
- return (OpApp e1 op2 fix2 e2)
+ | nofix_error
+ = do precParseErr (get_op op1,fix1) (get_op op2,fix2)
+ return (OpApp e1 op2 fix2 e2)
| associate_right = do
new_e <- mkOpAppRn e12 op2 fix2 e2
---------------------------
-- (- neg_arg) `op` e2
mkOpAppRn e1@(L _ (NegApp neg_arg neg_name)) op2 fix2 e2
- | nofix_error = do
- addErr (precParseErr (pp_prefix_minus,negateFixity) (ppr_op op2,fix2))
- return (OpApp e1 op2 fix2 e2)
+ | nofix_error
+ = do precParseErr (negateName,negateFixity) (get_op op2,fix2)
+ return (OpApp e1 op2 fix2 e2)
- | associate_right = do
- new_e <- mkOpAppRn neg_arg op2 fix2 e2
- return (NegApp (L loc' new_e) neg_name)
+ | associate_right
+ = do new_e <- mkOpAppRn neg_arg op2 fix2 e2
+ return (NegApp (L loc' new_e) neg_name)
where
loc' = combineLocs neg_arg e2
(nofix_error, associate_right) = compareFixity negateFixity fix2
---------------------------
-- e1 `op` - neg_arg
-mkOpAppRn e1 op1 fix1 e2@(L _ (NegApp neg_arg _)) -- NegApp can occur on the right
- | not associate_right= do -- We *want* right association
- addErr (precParseErr (ppr_op op1, fix1) (pp_prefix_minus, negateFixity))
- return (OpApp e1 op1 fix1 e2)
+mkOpAppRn e1 op1 fix1 e2@(L _ (NegApp _ _)) -- NegApp can occur on the right
+ | not associate_right -- We *want* right association
+ = do precParseErr (get_op op1, fix1) (negateName, negateFixity)
+ return (OpApp e1 op1 fix1 e2)
where
(_, associate_right) = compareFixity fix1 negateFixity
)
return (OpApp e1 op fix e2)
+----------------------------
+get_op :: LHsExpr Name -> Name
+get_op (L _ (HsVar n)) = n
+get_op other = pprPanic "get_op" (ppr other)
+
-- Parser left-associates everything, but
-- derived instances may have correctly-associated things to
-- in the right operarand. So we just check that the right operand is OK
+right_op_ok :: Fixity -> HsExpr Name -> Bool
right_op_ok fix1 (OpApp _ _ fix2 _)
= not error_please && associate_right
where
(error_please, associate_right) = compareFixity fix1 fix2
-right_op_ok fix1 other
+right_op_ok _ _
= True
-- Parser initially makes negation bind more tightly than any other operator
= ASSERT( not_op_app (unLoc neg_arg) )
return (NegApp neg_arg neg_name)
+not_op_app :: HsExpr id -> Bool
not_op_app (OpApp _ _ _ _) = False
-not_op_app other = True
+not_op_app _ = True
---------------------------
mkOpFormRn :: LHsCmdTop Name -- Left operand; already rearranged
-- (e11 `op1` e12) `op2` e2
mkOpFormRn a1@(L loc (HsCmdTop (L _ (HsArrForm op1 (Just fix1) [a11,a12])) _ _ _))
op2 fix2 a2
- | nofix_error = do
- addErr (precParseErr (ppr_op op1,fix1) (ppr_op op2,fix2))
- return (HsArrForm op2 (Just fix2) [a1, a2])
-
- | associate_right = do
- new_c <- mkOpFormRn a12 op2 fix2 a2
- return (HsArrForm op1 (Just fix1)
- [a11, L loc (HsCmdTop (L loc new_c) [] placeHolderType [])])
+ | nofix_error
+ = do precParseErr (get_op op1,fix1) (get_op op2,fix2)
+ return (HsArrForm op2 (Just fix2) [a1, a2])
+
+ | associate_right
+ = do new_c <- mkOpFormRn a12 op2 fix2 a2
+ return (HsArrForm op1 (Just fix1)
+ [a11, L loc (HsCmdTop (L loc new_c) [] placeHolderType [])])
-- TODO: locs are wrong
where
(nofix_error, associate_right) = compareFixity fix1 fix2
; let (nofix_error, associate_right) = compareFixity fix1 fix2
; if nofix_error then do
- { addErr (precParseErr (ppr_op op1,fix1) (ppr_op op2,fix2))
+ { precParseErr (unLoc op1,fix1) (unLoc op2,fix2)
; return (ConPatIn op2 (InfixCon p1 p2)) }
else if associate_right then do
; return (ConPatIn op1 (InfixCon p11 (L loc new_p))) } -- XXX loc right?
else return (ConPatIn op2 (InfixCon p1 p2)) }
-mkConOpPatRn op fix p1 p2 -- Default case, no rearrangment
+mkConOpPatRn op _ p1 p2 -- Default case, no rearrangment
= ASSERT( not_op_pat (unLoc p2) )
return (ConPatIn op (InfixCon p1 p2))
+not_op_pat :: Pat Name -> Bool
not_op_pat (ConPatIn _ (InfixCon _ _)) = False
-not_op_pat other = True
+not_op_pat _ = True
--------------------------------------
checkPrecMatch :: Bool -> Name -> MatchGroup Name -> RnM ()
-- True indicates an infix lhs
-- See comments with rnExpr (OpApp ...) about "deriving"
-checkPrecMatch False fn match
+checkPrecMatch False _ _
= return ()
checkPrecMatch True op (MatchGroup ms _)
= mapM_ check ms
-- until the type checker). So we don't want to crash on the
-- second eqn.
+checkPrec :: Name -> Pat Name -> Bool -> IOEnv (Env TcGblEnv TcLclEnv) ()
checkPrec op (ConPatIn op1 (InfixCon _ _)) right = do
op_fix@(Fixity op_prec op_dir) <- lookupFixityRn op
op1_fix@(Fixity op1_prec op1_dir) <- lookupFixityRn (unLoc op1)
(op1_dir == InfixR && op_dir == InfixR && right ||
op1_dir == InfixL && op_dir == InfixL && not right))
- info = (ppr_op op, op_fix)
- info1 = (ppr_op op1, op1_fix)
+ info = (op, op_fix)
+ info1 = (unLoc op1, op1_fix)
(infol, infor) = if right then (info, info1) else (info1, info)
+ unless inf_ok (precParseErr infol infor)
- checkErr inf_ok (precParseErr infol infor)
-
-checkPrec op pat right
+checkPrec _ _ _
= return ()
-- Check precedence of (arg op) or (op arg) respectively
-> LHsExpr Name -> LHsExpr Name -> RnM ()
checkSectionPrec direction section op arg
= case unLoc arg of
- OpApp _ op fix _ -> go_for_it (ppr_op op) fix
- NegApp _ _ -> go_for_it pp_prefix_minus negateFixity
- other -> return ()
+ OpApp _ op fix _ -> go_for_it (get_op op) fix
+ NegApp _ _ -> go_for_it negateName negateFixity
+ _ -> return ()
where
- L _ (HsVar op_name) = op
- go_for_it pp_arg_op arg_fix@(Fixity arg_prec assoc) = do
+ op_name = get_op op
+ go_for_it arg_op arg_fix@(Fixity arg_prec assoc) = do
op_fix@(Fixity op_prec _) <- lookupFixityRn op_name
- checkErr (op_prec < arg_prec
- || op_prec == arg_prec && direction == assoc)
- (sectionPrecErr (ppr_op op_name, op_fix)
- (pp_arg_op, arg_fix) section)
+ unless (op_prec < arg_prec
+ || (op_prec == arg_prec && direction == assoc))
+ (sectionPrecErr (op_name, op_fix)
+ (arg_op, arg_fix) section)
\end{code}
Precedence-related error messages
\begin{code}
-precParseErr op1 op2
- = hang (ptext SLIT("precedence parsing error"))
- 4 (hsep [ptext SLIT("cannot mix"), ppr_opfix op1, ptext SLIT("and"),
+precParseErr :: (Name, Fixity) -> (Name, Fixity) -> RnM ()
+precParseErr op1@(n1,_) op2@(n2,_)
+ | isUnboundName n1 || isUnboundName n2
+ = return () -- Avoid error cascade
+ | otherwise
+ = addErr $ hang (ptext (sLit "Precedence parsing error"))
+ 4 (hsep [ptext (sLit "cannot mix"), ppr_opfix op1, ptext (sLit "and"),
ppr_opfix op2,
- ptext SLIT("in the same infix expression")])
-
-sectionPrecErr op arg_op section
- = vcat [ptext SLIT("The operator") <+> ppr_opfix op <+> ptext SLIT("of a section"),
- nest 4 (ptext SLIT("must have lower precedence than the operand") <+> ppr_opfix arg_op),
- nest 4 (ptext SLIT("in the section:") <+> quotes (ppr section))]
-
-pp_prefix_minus = ptext SLIT("prefix `-'")
-ppr_op op = quotes (ppr op) -- Here, op can be a Name or a (Var n), where n is a Name
-ppr_opfix (pp_op, fixity) = pp_op <+> brackets (ppr fixity)
+ ptext (sLit "in the same infix expression")])
+
+sectionPrecErr :: (Name, Fixity) -> (Name, Fixity) -> HsExpr RdrName -> RnM ()
+sectionPrecErr op@(n1,_) arg_op@(n2,_) section
+ | isUnboundName n1 || isUnboundName n2
+ = return () -- Avoid error cascade
+ | otherwise
+ = addErr $ vcat [ptext (sLit "The operator") <+> ppr_opfix op <+> ptext (sLit "of a section"),
+ nest 4 (sep [ptext (sLit "must have lower precedence than that of the operand,"),
+ nest 2 (ptext (sLit "namely") <+> ppr_opfix arg_op)]),
+ nest 4 (ptext (sLit "in the section:") <+> quotes (ppr section))]
+
+ppr_opfix :: (Name, Fixity) -> SDoc
+ppr_opfix (op, fixity) = pp_op <+> brackets (ppr fixity)
+ where
+ pp_op | op == negateName = ptext (sLit "prefix `-'")
+ | otherwise = quotes (ppr op)
\end{code}
%*********************************************************
%*********************************************************
\begin{code}
+forAllWarn :: SDoc -> LHsType RdrName -> Located RdrName
+ -> TcRnIf TcGblEnv TcLclEnv ()
forAllWarn doc ty (L loc tyvar)
= ifOptM Opt_WarnUnusedMatches $
- addWarnAt loc (sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
- nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ addWarnAt loc (sep [ptext (sLit "The universally quantified type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext (sLit "does not appear in the type") <+> quotes (ppr ty))]
$$
doc)
-opTyErr op ty
- = hang (ptext SLIT("Illegal operator") <+> quotes (ppr op) <+> ptext SLIT("in type") <+> quotes (ppr ty))
- 2 (parens (ptext SLIT("Use -XTypeOperators to allow operators in types")))
+opTyErr :: RdrName -> HsType RdrName -> SDoc
+opTyErr op ty@(HsOpTy ty1 _ _)
+ = hang (ptext (sLit "Illegal operator") <+> quotes (ppr op) <+> ptext (sLit "in type") <+> quotes (ppr ty))
+ 2 extra
+ where
+ extra | op == dot_tv_RDR && forall_head ty1
+ = perhapsForallMsg
+ | otherwise
+ = ptext (sLit "Use -XTypeOperators to allow operators in types")
+
+ forall_head (L _ (HsTyVar tv)) = tv == forall_tv_RDR
+ forall_head (L _ (HsAppTy ty _)) = forall_head ty
+ forall_head _other = False
+opTyErr _ ty = pprPanic "opTyErr: Not an op" (ppr ty)
\end{code}