\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 PrelNames
import TypeRep ( funTyCon )
-import Constants ( mAX_TUPLE_SIZE )
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
#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
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
pred' <- rnPred doc pred
return (HsPredTy pred')
-rnHsType doc (HsSpliceTy _) = do
- addErr (ptext SLIT("Type splices are not yet implemented"))
+rnHsType _ (HsSpliceTy _) = do
+ addErr (ptext (sLit "Type splices are not yet implemented"))
failM
rnHsType doc (HsDocTy ty haddock_doc) = do
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
(\t1 t2 -> HsOpTy t1 op2 t2)
(ppr 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
-mkHsOpTyRn mk1 pp_op1 fix1 ty1 ty2 -- Default case, no rearrangment
+mkHsOpTyRn mk1 _ _ ty1 ty2 -- Default case, no rearrangment
= return (mk1 ty1 ty2)
---------------
---------------------------
-- e1 `op` - neg_arg
-mkOpAppRn e1 op1 fix1 e2@(L _ (NegApp neg_arg _)) -- NegApp can occur on the right
+mkOpAppRn e1 op1 fix1 e2@(L _ (NegApp _ _)) -- 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)
-- 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
; 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)
checkErr inf_ok (precParseErr infol infor)
-checkPrec op pat right
+checkPrec _ _ _
= return ()
-- Check precedence of (arg op) or (op arg) respectively
= case unLoc arg of
OpApp _ op fix _ -> go_for_it (ppr_op op) fix
NegApp _ _ -> go_for_it pp_prefix_minus negateFixity
- other -> return ()
+ _ -> return ()
where
L _ (HsVar op_name) = op
go_for_it pp_arg_op arg_fix@(Fixity arg_prec assoc) = do
Precedence-related error messages
\begin{code}
+precParseErr :: (SDoc, Fixity) -> (SDoc, Fixity) -> SDoc
precParseErr op1 op2
- = hang (ptext SLIT("precedence parsing error"))
- 4 (hsep [ptext SLIT("cannot mix"), ppr_opfix op1, ptext SLIT("and"),
+ = 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")])
+ ptext (sLit "in the same infix expression")])
+sectionPrecErr :: (SDoc, Fixity) -> (SDoc, Fixity) -> HsExpr RdrName -> SDoc
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))]
+ = 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 `-'")
+pp_prefix_minus :: SDoc
+pp_prefix_minus = ptext (sLit "prefix `-'")
+ppr_op :: Outputable a => a -> SDoc
ppr_op op = quotes (ppr op) -- Here, op can be a Name or a (Var n), where n is a Name
+ppr_opfix :: (SDoc, Fixity) -> SDoc
ppr_opfix (pp_op, fixity) = pp_op <+> brackets (ppr fixity)
\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
+ = ptext (sLit "Perhaps you intended to use -XRankNTypes or similar flag")
+ | 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}
projects / ghc-hetmet.git / blobdiff