\section[RnEnv]{Environment manipulation for the renamer monad}
\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 RnEnv (
newTopSrcBinder, lookupFamInstDeclBndr,
- lookupLocatedBndrRn, lookupBndrRn, lookupBndrRn_maybe,
- lookupLocatedTopBndrRn, lookupTopBndrRn, lookupBndrRn_maybe,
+ lookupLocatedTopBndrRn, lookupTopBndrRn,
lookupLocatedOccRn, lookupOccRn,
lookupLocatedGlobalOccRn, lookupGlobalOccRn,
lookupLocalDataTcNames, lookupSrcOcc_maybe,
- lookupFixityRn, lookupTyFixityRn, lookupLocatedSigOccRn,
+ lookupSigOccRn,
+ lookupFixityRn, lookupTyFixityRn,
lookupInstDeclBndr, lookupRecordBndr, lookupConstructorFields,
lookupSyntaxName, lookupSyntaxTable, lookupImportedName,
lookupGreRn, lookupGreLocalRn, lookupGreRn_maybe,
getLookupOccRn,
newLocalsRn, newIPNameRn,
- bindLocalNames, bindLocalNamesFV, bindLocalNamesFV_WithFixities,
+ bindLocalNames, bindLocalNamesFV,
+ MiniFixityEnv, emptyFsEnv, extendFsEnv, lookupFsEnv,
+ bindLocalNamesFV_WithFixities,
bindLocatedLocalsFV, bindLocatedLocalsRn,
bindSigTyVarsFV, bindPatSigTyVars, bindPatSigTyVarsFV,
bindTyVarsRn, extendTyVarEnvFVRn,
- bindLocalFixities,
checkDupRdrNames, checkDupNames, checkShadowedNames,
checkDupAndShadowedRdrNames,
mapFvRn, mapFvRnCPS,
warnUnusedMatches, warnUnusedModules, warnUnusedImports,
warnUnusedTopBinds, warnUnusedLocalBinds,
- dataTcOccs, unknownNameErr,
+ dataTcOccs, unknownNameErr, perhapsForallMsg
) where
#include "HsVersions.h"
import LoadIface ( loadInterfaceForName, loadSrcInterface )
import IfaceEnv ( lookupOrig, newGlobalBinder, newIPName )
-import HsSyn ( FixitySig(..), HsExpr(..), SyntaxExpr, SyntaxTable,
- LHsTyVarBndr, LHsType,
- Fixity, hsLTyVarLocNames, replaceTyVarName )
+import HsSyn
import RdrHsSyn ( extractHsTyRdrTyVars )
import RdrName
import HscTypes ( availNames, ModIface(..), FixItem(..), lookupFixity)
-import TcEnv ( tcLookupDataCon )
+import TcEnv ( tcLookupDataCon, tcLookupField, isBrackStage )
import TcRnMonad
+import Id ( isRecordSelector )
import Name ( Name, nameIsLocalOrFrom, mkInternalName, isWiredInName,
nameSrcLoc, nameSrcSpan, nameOccName, nameModule, isExternalName )
import NameSet
import NameEnv
import LazyUniqFM
import DataCon ( dataConFieldLabels )
-import OccName ( OccName, tcName, isDataOcc, pprNonVarNameSpace, occNameSpace,
- reportIfUnused, occNameFS )
+import OccName
import Module ( Module, ModuleName )
-import PrelNames ( mkUnboundName, rOOT_MAIN, iNTERACTIVE, consDataConKey, hasKey )
+import PrelNames ( mkUnboundName, rOOT_MAIN, iNTERACTIVE,
+ consDataConKey, hasKey, forall_tv_RDR )
import UniqSupply
import BasicTypes ( IPName, mapIPName, Fixity )
-import SrcLoc ( SrcSpan, srcSpanStart, Located(..), eqLocated, unLoc,
- srcLocSpan, getLoc, combineSrcSpans, isOneLineSpan )
+import ErrUtils ( Message )
+import SrcLoc
import Outputable
import Util
import Maybes
(addErrAt loc (badQualBndrErr rdr_name))
-- Binders should not be qualified; if they are, and with a different
-- module name, we we get a confusing "M.T is not in scope" error later
- ; newGlobalBinder this_mod (rdrNameOcc rdr_name) loc }
+
+ ; stage <- getStage
+ ; if isBrackStage stage then
+ -- We are inside a TH bracket, so make an *Internal* name
+ -- See Note [Top-level Names in Template Haskell decl quotes] in RnNames
+ do { uniq <- newUnique
+ ; return (mkInternalName uniq (rdrNameOcc rdr_name) loc) }
+ else
+ -- Normal case
+ newGlobalBinder this_mod (rdrNameOcc rdr_name) loc }
\end{code}
%*********************************************************
Looking up a name in the RnEnv.
\begin{code}
-lookupLocatedBndrRn :: Located RdrName -> RnM (Located Name)
-lookupLocatedBndrRn = wrapLocM lookupBndrRn
-
-lookupBndrRn :: RdrName -> RnM Name
-lookupBndrRn n = do nopt <- lookupBndrRn_maybe n
- case nopt of
- Just n' -> return n'
- Nothing -> do traceRn $ text "lookupTopBndrRn"
- unboundName n
-
lookupTopBndrRn :: RdrName -> RnM Name
lookupTopBndrRn n = do nopt <- lookupTopBndrRn_maybe n
case nopt of
Nothing -> do traceRn $ text "lookupTopBndrRn"
unboundName n
-lookupBndrRn_maybe :: RdrName -> RnM (Maybe Name)
--- NOTE: assumes that the SrcSpan of the binder has already been setSrcSpan'd
-lookupBndrRn_maybe rdr_name
- = getLocalRdrEnv `thenM` \ local_env ->
- case lookupLocalRdrEnv local_env rdr_name of
- Just name -> returnM (Just name)
- Nothing -> lookupTopBndrRn_maybe rdr_name
-
lookupLocatedTopBndrRn :: Located RdrName -> RnM (Located Name)
lookupLocatedTopBndrRn = wrapLocM lookupTopBndrRn
Nothing -> returnM Nothing
Just gre -> returnM (Just $ gre_name gre) }
--- lookupLocatedSigOccRn is used for type signatures and pragmas
--- Is this valid?
--- module A
--- import M( f )
--- f :: Int -> Int
--- f x = x
--- It's clear that the 'f' in the signature must refer to A.f
--- The Haskell98 report does not stipulate this, but it will!
--- So we must treat the 'f' in the signature in the same way
--- as the binding occurrence of 'f', using lookupBndrRn
---
--- However, consider this case:
--- import M( f )
--- f :: Int -> Int
--- g x = x
--- We don't want to say 'f' is out of scope; instead, we want to
--- return the imported 'f', so that later on the reanamer will
--- correctly report "misplaced type sig".
-lookupLocatedSigOccRn :: Located RdrName -> RnM (Located Name)
-lookupLocatedSigOccRn = wrapLocM $ \ rdr_name -> do
- { local_env <- getLocalRdrEnv
- ; case lookupLocalRdrEnv local_env rdr_name of {
- Just n -> return n ;
- Nothing -> do
- { mb_gre <- lookupGreLocalRn rdr_name
- ; case mb_gre of
- Just gre -> return (gre_name gre)
- Nothing -> lookupGlobalOccRn rdr_name
- }}}
-----------------------------------------------
lookupInstDeclBndr :: Name -> Located RdrName -> RnM (Located Name)
-- an instance decl
lookupInstDeclBndr cls rdr = lookup_located_sub_bndr is_op doc rdr
where
- doc = ptext SLIT("method of class") <+> quotes (ppr cls)
- is_op gre@(GRE {gre_par = ParentIs n}) = n == cls
- is_op other = False
+ doc = ptext (sLit "method of class") <+> quotes (ppr cls)
+ is_op (GRE {gre_par = ParentIs n}) = n == cls
+ is_op _ = False
-----------------------------------------------
lookupRecordBndr :: Maybe (Located Name) -> Located RdrName -> RnM (Located Name)
-- Used for record construction and pattern matching
--- When the -fdisambiguate-record-fields flag is on, take account of the
+-- When the -XDisambiguateRecordFields flag is on, take account of the
-- constructor name to disambiguate which field to use; it's just the
-- same as for instance decls
+--
+-- NB: Consider this:
+-- module Foo where { data R = R { fld :: Int } }
+-- module Odd where { import Foo; fld x = x { fld = 3 } }
+-- Arguably this should work, because the reference to 'fld' is
+-- unambiguous because there is only one field id 'fld' in scope.
+-- But currently it's rejected.
lookupRecordBndr Nothing rdr_name
= lookupLocatedGlobalOccRn rdr_name
lookupRecordBndr (Just (L _ data_con)) rdr_name
; lookup_located_sub_bndr is_field doc rdr_name
}}
where
- doc = ptext SLIT("field of constructor") <+> quotes (ppr data_con)
+ doc = ptext (sLit "field of constructor") <+> quotes (ppr data_con)
lookupConstructorFields :: Name -> RnM [Name]
lookupConstructorFields con_name
= do { this_mod <- getModule
; if nameIsLocalOrFrom this_mod con_name then
- do { field_env <- getRecFieldEnv
+ do { RecFields field_env _ <- getRecFieldEnv
; return (lookupNameEnv field_env con_name `orElse` []) }
else
do { con <- tcLookupDataCon con_name
lookup_located_sub_bndr is_good doc rdr_name
= wrapLocM (lookup_sub_bndr is_good doc) rdr_name
+lookup_sub_bndr :: (GlobalRdrElt -> Bool) -> SDoc -> RdrName -> RnM Name
lookup_sub_bndr is_good doc rdr_name
| isUnqual rdr_name -- Find all the things the rdr-name maps to
= do { -- and pick the one with the right parent name
lookupFamInstDeclBndr mod lrdr_name@(L _ rdr_name)
= do { mb_gre <- lookupGreRn_maybe rdr_name
; case mb_gre of
- Just gre -> returnM (gre_name gre) ;
+ Just gre -> returnM (gre_name gre)
Nothing -> newTopSrcBinder mod lrdr_name }
--------------------------------------------------
= lookupImportedName rdr_name
| otherwise
- = -- First look up the name in the normal environment.
- lookupGreRn_maybe rdr_name `thenM` \ mb_gre ->
+ = do
+ -- First look up the name in the normal environment.
+ mb_gre <- lookupGreRn_maybe rdr_name
case mb_gre of {
Just gre -> returnM (gre_name gre) ;
- Nothing ->
+ Nothing -> do
-- We allow qualified names on the command line to refer to
-- *any* name exported by any module in scope, just as if
-- there was an "import qualified M" declaration for every
-- module.
- getModule `thenM` \ mod ->
- if isQual rdr_name && mod == iNTERACTIVE then
- -- This test is not expensive,
- lookupQualifiedName rdr_name -- and only happens for failed lookups
- else do
- traceRn $ text "lookupGlobalOccRn"
- unboundName rdr_name }
+ allow_qual <- doptM Opt_ImplicitImportQualified
+ mod <- getModule
+ -- This test is not expensive,
+ -- and only happens for failed lookups
+ if isQual rdr_name && allow_qual && mod == iNTERACTIVE
+ then lookupQualifiedName rdr_name
+ else unboundName rdr_name
+ }
lookupImportedName :: RdrName -> TcRnIf m n Name
-- Lookup the occurrence of an imported name
= do { addErr (unknownNameErr rdr_name)
; env <- getGlobalRdrEnv;
; traceRn (vcat [unknownNameErr rdr_name,
- ptext SLIT("Global envt is:"),
+ ptext (sLit "Global envt is:"),
nest 3 (pprGlobalRdrEnv env)])
; returnM (mkUnboundName rdr_name) }
| Just (mod,occ) <- isQual_maybe rdr_name
-- Note: we want to behave as we would for a source file import here,
-- and respect hiddenness of modules/packages, hence loadSrcInterface.
- = loadSrcInterface doc mod False `thenM` \ iface ->
+ = loadSrcInterface doc mod False Nothing `thenM` \ iface ->
case [ (mod,occ) |
(mod,avails) <- mi_exports iface,
| otherwise
= pprPanic "RnEnv.lookupQualifiedName" (ppr rdr_name)
where
- doc = ptext SLIT("Need to find") <+> ppr rdr_name
+ doc = ptext (sLit "Need to find") <+> ppr rdr_name
\end{code}
-%*********************************************************
-%* *
- Fixities
-%* *
-%*********************************************************
+lookupSigOccRn is used for type signatures and pragmas
+Is this valid?
+ module A
+ import M( f )
+ f :: Int -> Int
+ f x = x
+It's clear that the 'f' in the signature must refer to A.f
+The Haskell98 report does not stipulate this, but it will!
+So we must treat the 'f' in the signature in the same way
+as the binding occurrence of 'f', using lookupBndrRn
+
+However, consider this case:
+ import M( f )
+ f :: Int -> Int
+ g x = x
+We don't want to say 'f' is out of scope; instead, we want to
+return the imported 'f', so that later on the reanamer will
+correctly report "misplaced type sig".
\begin{code}
-lookupLocalDataTcNames :: RdrName -> RnM [Name]
+lookupSigOccRn :: Maybe NameSet -- Just ns => source file; these are the binders
+ -- in the same group
+ -- Nothing => hs-boot file; signatures without
+ -- binders are expected
+ -> Sig RdrName
+ -> Located RdrName -> RnM (Located Name)
+lookupSigOccRn mb_bound_names sig
+ = wrapLocM $ \ rdr_name ->
+ do { mb_name <- lookupBindGroupOcc mb_bound_names (hsSigDoc sig) rdr_name
+ ; case mb_name of
+ Left err -> do { addErr err; return (mkUnboundName rdr_name) }
+ Right name -> return name }
+
+lookupBindGroupOcc :: Maybe NameSet -- Just ns => source file; these are the binders
+ -- in the same group
+ -- Nothing => hs-boot file; signatures without
+ -- binders are expected
+ -> SDoc
+ -> RdrName -> RnM (Either Message Name)
+-- Looks up the RdrName, expecting it to resolve to one of the
+-- bound names passed in. If not, return an appropriate error message
+lookupBindGroupOcc mb_bound_names what rdr_name
+ = do { local_env <- getLocalRdrEnv
+ ; case lookupLocalRdrEnv local_env rdr_name of
+ Just n -> check_local_name n
+ Nothing -> do -- Not defined in a nested scope
+
+ { env <- getGlobalRdrEnv
+ ; let gres = lookupGlobalRdrEnv env (rdrNameOcc rdr_name)
+ ; case (filter isLocalGRE gres) of
+ (gre:_) -> check_local_name (gre_name gre)
+ -- If there is more than one local GRE for the
+ -- same OccName, that will be reported separately
+ [] | null gres -> bale_out_with empty
+ | otherwise -> bale_out_with import_msg
+ }}
+ where
+ check_local_name name -- The name is in scope, and not imported
+ = case mb_bound_names of
+ Just bound_names | not (name `elemNameSet` bound_names)
+ -> bale_out_with local_msg
+ _other -> return (Right name)
+
+ bale_out_with msg
+ = return (Left (sep [ ptext (sLit "The") <+> what
+ <+> ptext (sLit "for") <+> quotes (ppr rdr_name)
+ , nest 2 $ ptext (sLit "lacks an accompanying binding")]
+ $$ nest 2 msg))
+
+ local_msg = parens $ ptext (sLit "The") <+> what <+> ptext (sLit "must be given where")
+ <+> quotes (ppr rdr_name) <+> ptext (sLit "is declared")
+
+ import_msg = parens $ ptext (sLit "You cannot give a") <+> what
+ <+> ptext (sLit "for an imported value")
+
+---------------
+lookupLocalDataTcNames :: NameSet -> SDoc -> RdrName -> RnM [Name]
-- GHC extension: look up both the tycon and data con
-- for con-like things
-- Complain if neither is in scope
-lookupLocalDataTcNames rdr_name
+lookupLocalDataTcNames bound_names what rdr_name
| Just n <- isExact_maybe rdr_name
-- Special case for (:), which doesn't get into the GlobalRdrEnv
= return [n] -- For this we don't need to try the tycon too
| otherwise
- = do { mb_gres <- mapM lookupGreLocalRn (dataTcOccs rdr_name)
- ; case [gre_name gre | Just gre <- mb_gres] of
- [] -> do {
- -- run for error reporting
- ; unboundName rdr_name
- ; return [] }
- names -> return names
- }
+ = do { mb_gres <- mapM (lookupBindGroupOcc (Just bound_names) what)
+ (dataTcOccs rdr_name)
+ ; let (errs, names) = splitEithers mb_gres
+ ; when (null names) (addErr (head errs)) -- Bleat about one only
+ ; return names }
+
+dataTcOccs :: RdrName -> [RdrName]
+-- If the input is a data constructor, return both it and a type
+-- constructor. This is useful when we aren't sure which we are
+-- looking at.
+dataTcOccs rdr_name
+ | Just n <- isExact_maybe rdr_name -- Ghastly special case
+ , n `hasKey` consDataConKey = [rdr_name] -- see note below
+ | isDataOcc occ = [rdr_name, rdr_name_tc]
+ | otherwise = [rdr_name]
+ where
+ occ = rdrNameOcc rdr_name
+ rdr_name_tc = setRdrNameSpace rdr_name tcName
+
+-- If the user typed "[]" or "(,,)", we'll generate an Exact RdrName,
+-- and setRdrNameSpace generates an Orig, which is fine
+-- But it's not fine for (:), because there *is* no corresponding type
+-- constructor. If we generate an Orig tycon for GHC.Base.(:), it'll
+-- appear to be in scope (because Orig's simply allocate a new name-cache
+-- entry) and then we get an error when we use dataTcOccs in
+-- TcRnDriver.tcRnGetInfo. Large sigh.
+\end{code}
+
+
+%*********************************************************
+%* *
+ Fixities
+%* *
+%*********************************************************
+\begin{code}
--------------------------------
-bindLocalFixities :: [FixitySig RdrName] -> (UniqFM (Located Fixity) -> RnM a) -> RnM a
--- Used for nested fixity decls:
--- bind the names that are in scope already;
--- pass the rest to the continuation for later
--- as a FastString->(Located Fixity) map
---
--- No need to worry about type constructors here,
--- Should check for duplicates?
-bindLocalFixities fixes thing_inside
- | null fixes = thing_inside emptyUFM
- | otherwise = do ls <- mappM rn_sig fixes
- let (now, later) = nowAndLater ls
- extendFixityEnv now $ thing_inside later
- where
- rn_sig (FixitySig lv@(L loc v) fix) = do
- vopt <- lookupBndrRn_maybe v
- case vopt of
- Just new_v -> returnM (Left (new_v, (FixItem (rdrNameOcc v) fix)))
- Nothing -> returnM (Right (occNameFS $ rdrNameOcc v, (L loc fix)))
-
- nowAndLater :: [Either (Name, FixItem) (FastString, Located Fixity)]
- -> ([(Name,FixItem)], UniqFM (Located Fixity))
- nowAndLater ls =
- foldr (\ cur -> \ (now, later) ->
- case cur of
- Left (n, f) -> ((n, f) : now, later)
- Right (fs, f) -> (now, addToUFM later fs f))
- ([], emptyUFM) ls
+type FastStringEnv a = UniqFM a -- Keyed by FastString
+
+
+emptyFsEnv :: FastStringEnv a
+lookupFsEnv :: FastStringEnv a -> FastString -> Maybe a
+extendFsEnv :: FastStringEnv a -> FastString -> a -> FastStringEnv a
+
+emptyFsEnv = emptyUFM
+lookupFsEnv = lookupUFM
+extendFsEnv = addToUFM
+
+--------------------------------
+type MiniFixityEnv = FastStringEnv (Located Fixity)
+ -- Mini fixity env for the names we're about
+ -- to bind, in a single binding group
+ --
+ -- It is keyed by the *FastString*, not the *OccName*, because
+ -- the single fixity decl infix 3 T
+ -- affects both the data constructor T and the type constrctor T
+ --
+ -- We keep the location so that if we find
+ -- a duplicate, we can report it sensibly
+--------------------------------
-- Used for nested fixity decls to bind names along with their fixities.
-- the fixities are given as a UFM from an OccName's FastString to a fixity decl
-- Also check for unused binders
bindLocalNamesFV_WithFixities :: [Name]
- -> UniqFM (Located Fixity)
+ -> MiniFixityEnv
-> RnM (a, FreeVars) -> RnM (a, FreeVars)
bindLocalNamesFV_WithFixities names fixities thing_inside
= bindLocalNamesFV names $
boundFixities = foldr
(\ name -> \ acc ->
-- check whether this name has a fixity decl
- case lookupUFM fixities (occNameFS (nameOccName name)) of
+ case lookupFsEnv fixities (occNameFS (nameOccName name)) of
Just (L _ fix) -> (name, FixItem (nameOccName name) fix) : acc
Nothing -> acc) [] names
-- bind the names; extend the fixity env; do the thing inside
returnM (mi_fix_fn iface (nameOccName name))
}
where
- doc = ptext SLIT("Checking fixity for") <+> ppr name
+ doc = ptext (sLit "Checking fixity for") <+> ppr name
---------------
lookupTyFixityRn :: Located Name -> RnM Fixity
-lookupTyFixityRn (L loc n) = lookupFixityRn n
+lookupTyFixityRn (L _ n) = lookupFixityRn n
----------------
-dataTcOccs :: RdrName -> [RdrName]
--- If the input is a data constructor, return both it and a type
--- constructor. This is useful when we aren't sure which we are
--- looking at.
-dataTcOccs rdr_name
- | Just n <- isExact_maybe rdr_name -- Ghastly special case
- , n `hasKey` consDataConKey = [rdr_name] -- see note below
- | isDataOcc occ = [rdr_name_tc, rdr_name]
- | otherwise = [rdr_name]
- where
- occ = rdrNameOcc rdr_name
- rdr_name_tc = setRdrNameSpace rdr_name tcName
-
--- If the user typed "[]" or "(,,)", we'll generate an Exact RdrName,
--- and setRdrNameSpace generates an Orig, which is fine
--- But it's not fine for (:), because there *is* no corresponding type
--- constructor. If we generate an Orig tycon for GHC.Base.(:), it'll
--- appear to be in scope (because Orig's simply allocate a new name-cache
--- entry) and then we get an error when we use dataTcOccs in
--- TcRnDriver.tcRnGetInfo. Large sigh.
\end{code}
%************************************************************************
; mappM_ check_shadow loc_rdr_names }
where
check_shadow (loc, occ)
- | Just n <- mb_local = complain [ptext SLIT("bound at") <+> ppr loc]
- | not (null gres) = complain (map pprNameProvenance gres)
- | otherwise = return ()
+ | Just n <- mb_local = complain [ptext (sLit "bound at") <+> ppr (nameSrcLoc n)]
+ | otherwise = do { gres' <- filterM is_shadowed_gre gres
+ ; complain (map pprNameProvenance gres') }
where
+ complain [] = return ()
complain pp_locs = addWarnAt loc (shadowedNameWarn doc_str occ pp_locs)
mb_local = lookupLocalRdrOcc local_env occ
gres = lookupGRE_RdrName (mkRdrUnqual occ) global_env
-- Make an Unqualified RdrName and look that up, so that
-- we don't find any GREs that are in scope qualified-only
+
+ is_shadowed_gre :: GlobalRdrElt -> RnM Bool
+ -- Returns False for record selectors that are shadowed, when
+ -- punning or wild-cards are on (cf Trac #2723)
+ is_shadowed_gre gre@(GRE { gre_par = ParentIs _ })
+ = do { dflags <- getDOpts
+ ; if (dopt Opt_RecordPuns dflags || dopt Opt_RecordWildCards dflags)
+ then do { is_fld <- is_rec_fld gre; return (not is_fld) }
+ else return True }
+ is_shadowed_gre _other = return True
+
+ is_rec_fld gre -- Return True for record selector ids
+ | isLocalGRE gre = do { RecFields _ fld_set <- getRecFieldEnv
+ ; return (gre_name gre `elemNameSet` fld_set) }
+ | otherwise = do { sel_id <- tcLookupField (gre_name gre)
+ ; return (isRecordSelector sel_id) }
\end{code}
\begin{code}
-- A useful utility
-mapFvRn f xs = mappM f xs `thenM` \ stuff ->
- let
- (ys, fvs_s) = unzip stuff
- in
- returnM (ys, plusFVs fvs_s)
+mapFvRn :: (a -> RnM (b, FreeVars)) -> [a] -> RnM ([b], FreeVars)
+mapFvRn f xs = do stuff <- mappM f xs
+ case unzip stuff of
+ (ys, fvs_s) -> returnM (ys, plusFVs fvs_s)
-- because some of the rename functions are CPSed:
-- maps the function across the list from left to right;
= ifOptM Opt_WarnUnusedImports (mappM_ bleat mods)
where
bleat (mod,loc) = addWarnAt loc (mk_warn mod)
- mk_warn m = vcat [ptext SLIT("Module") <+> quotes (ppr m)
+ mk_warn m = vcat [ptext (sLit "Module") <+> quotes (ppr m)
<+> text "is imported, but nothing from it is used,",
- nest 2 (ptext SLIT("except perhaps instances visible in")
+ nest 2 (ptext (sLit "except perhaps instances visible in")
<+> quotes (ppr m)),
- ptext SLIT("To suppress this warning, use:")
- <+> ptext SLIT("import") <+> ppr m <> parens empty ]
+ ptext (sLit "To suppress this warning, use:")
+ <+> ptext (sLit "import") <+> ppr m <> parens empty ]
warnUnusedImports, warnUnusedTopBinds :: [GlobalRdrElt] -> RnM ()
warnUnusedImports gres = ifOptM Opt_WarnUnusedImports (warnUnusedGREs gres)
warnUnusedTopBinds gres = ifOptM Opt_WarnUnusedBinds (warnUnusedGREs gres)
-warnUnusedLocalBinds, warnUnusedMatches :: [Name] -> RnM (a, FreeVars) -> RnM (a, FreeVars)
+warnUnusedLocalBinds, warnUnusedMatches :: [Name] -> FreeVars -> RnM ()
warnUnusedLocalBinds = check_unused Opt_WarnUnusedBinds
warnUnusedMatches = check_unused Opt_WarnUnusedMatches
-check_unused :: DynFlag -> [Name] -> RnM (a, FreeVars) -> RnM (a, FreeVars)
-check_unused flag names thing_inside
- = do { (res, res_fvs) <- thing_inside
-
- -- Warn about unused names
- ; ifOptM flag (warnUnusedLocals (filterOut (`elemNameSet` res_fvs) names))
-
- -- And return
- ; return (res, res_fvs) }
+check_unused :: DynFlag -> [Name] -> FreeVars -> RnM ()
+check_unused flag bound_names used_names
+ = ifOptM flag (warnUnusedLocals (filterOut (`elemNameSet` used_names) bound_names))
-------------------------
-- Helpers
+warnUnusedGREs :: [GlobalRdrElt] -> RnM ()
warnUnusedGREs gres
= warnUnusedBinds [(n,p) | GRE {gre_name = n, gre_prov = p} <- gres]
+warnUnusedLocals :: [Name] -> RnM ()
warnUnusedLocals names
= warnUnusedBinds [(n,LocalDef) | n<-names]
warnUnusedName :: (Name, Provenance) -> RnM ()
warnUnusedName (name, LocalDef)
= addUnusedWarning name (srcLocSpan (nameSrcLoc name))
- (ptext SLIT("Defined but not used"))
+ (ptext (sLit "Defined but not used"))
warnUnusedName (name, Imported is)
= mapM_ warn is
where
span = importSpecLoc spec
pp_mod = quotes (ppr (importSpecModule spec))
- msg = ptext SLIT("Imported from") <+> pp_mod <+> ptext SLIT("but not used")
+ msg = ptext (sLit "Imported from") <+> pp_mod <+> ptext (sLit "but not used")
+addUnusedWarning :: Name -> SrcSpan -> SDoc -> RnM ()
addUnusedWarning name span msg
= addWarnAt span $
sep [msg <> colon,
\end{code}
\begin{code}
+addNameClashErrRn :: RdrName -> [GlobalRdrElt] -> RnM ()
addNameClashErrRn rdr_name names
- = addErr (vcat [ptext SLIT("Ambiguous occurrence") <+> quotes (ppr rdr_name),
- ptext SLIT("It could refer to") <+> vcat (msg1 : msgs)])
+ = addErr (vcat [ptext (sLit "Ambiguous occurrence") <+> quotes (ppr rdr_name),
+ ptext (sLit "It could refer to") <+> vcat (msg1 : msgs)])
where
(np1:nps) = names
- msg1 = ptext SLIT("either") <+> mk_ref np1
- msgs = [ptext SLIT(" or") <+> mk_ref np | np <- nps]
+ msg1 = ptext (sLit "either") <+> mk_ref np1
+ msgs = [ptext (sLit " or") <+> mk_ref np | np <- nps]
mk_ref gre = quotes (ppr (gre_name gre)) <> comma <+> pprNameProvenance gre
+shadowedNameWarn :: SDoc -> OccName -> [SDoc] -> SDoc
shadowedNameWarn doc occ shadowed_locs
- = sep [ptext SLIT("This binding for") <+> quotes (ppr occ)
- <+> ptext SLIT("shadows the existing binding") <> plural shadowed_locs,
+ = sep [ptext (sLit "This binding for") <+> quotes (ppr occ)
+ <+> ptext (sLit "shadows the existing binding") <> plural shadowed_locs,
nest 2 (vcat shadowed_locs)]
$$ doc
+unknownNameErr :: RdrName -> SDoc
unknownNameErr rdr_name
- = sep [ptext SLIT("Not in scope:"),
- nest 2 $ pprNonVarNameSpace (occNameSpace (rdrNameOcc rdr_name))
- <+> quotes (ppr rdr_name)]
+ = vcat [ hang (ptext (sLit "Not in scope:"))
+ 2 (pprNonVarNameSpace (occNameSpace (rdrNameOcc rdr_name))
+ <+> quotes (ppr rdr_name))
+ , extra ]
+ where
+ extra | rdr_name == forall_tv_RDR = perhapsForallMsg
+ | otherwise = empty
+
+perhapsForallMsg :: SDoc
+perhapsForallMsg
+ = vcat [ ptext (sLit "Perhaps you intended to use -XRankNTypes or similar flag")
+ , ptext (sLit "to enable explicit-forall syntax: forall <tvs>. <type>")]
+unknownSubordinateErr :: SDoc -> RdrName -> SDoc
unknownSubordinateErr doc op -- Doc is "method of class" or
-- "field of constructor"
- = quotes (ppr op) <+> ptext SLIT("is not a (visible)") <+> doc
+ = quotes (ppr op) <+> ptext (sLit "is not a (visible)") <+> doc
+badOrigBinding :: RdrName -> SDoc
badOrigBinding name
- = ptext SLIT("Illegal binding of built-in syntax:") <+> ppr (rdrNameOcc name)
+ = ptext (sLit "Illegal binding of built-in syntax:") <+> ppr (rdrNameOcc name)
-- The rdrNameOcc is because we don't want to print Prelude.(,)
dupNamesErr :: Outputable n => (n -> SrcSpan) -> SDoc -> [n] -> RnM ()
dupNamesErr get_loc descriptor names
= addErrAt big_loc $
- vcat [ptext SLIT("Conflicting definitions for") <+> quotes (ppr (head names)),
+ vcat [ptext (sLit "Conflicting definitions for") <+> quotes (ppr (head names)),
locations, descriptor]
where
locs = map get_loc names
big_loc = foldr1 combineSrcSpans locs
one_line = isOneLineSpan big_loc
locations | one_line = empty
- | otherwise = ptext SLIT("Bound at:") <+>
+ | otherwise = ptext (sLit "Bound at:") <+>
vcat (map ppr (sortLe (<=) locs))
+badQualBndrErr :: RdrName -> SDoc
badQualBndrErr rdr_name
- = ptext SLIT("Qualified name in binding position:") <+> ppr rdr_name
+ = ptext (sLit "Qualified name in binding position:") <+> ppr rdr_name
\end{code}
projects / ghc-hetmet.git / blobdiff