\begin{code}
module RnNames (
- rnImports, importsFromLocalDecls,
- rnExports,
+ rnImports, mkRdrEnvAndImports, importsFromLocalDecls,
+ rnExports, mkExportNameSet,
getLocalDeclBinders, extendRdrEnvRn,
- reportUnusedNames, reportDeprecations,
+ reportUnusedNames, reportDeprecations,
mkModDeps
) where
import DynFlags ( DynFlag(..), GhcMode(..) )
import HsSyn ( IE(..), ieName, ImportDecl(..), LImportDecl,
ForeignDecl(..), HsGroup(..), HsValBinds(..),
- Sig(..), collectHsBindLocatedBinders, tyClDeclNames
- )
+ Sig(..), collectHsBindLocatedBinders, tyClDeclNames,
+ LIE )
import RnEnv
import IfaceEnv ( ifaceExportNames )
import LoadIface ( loadSrcInterface )
-import TcRnMonad
+import TcRnMonad hiding (LIE)
import FiniteMap
import PrelNames ( pRELUDE, isUnboundName, main_RDR_Unqual )
%************************************************************************
\begin{code}
-rnImports :: [LImportDecl RdrName]
- -> RnM (GlobalRdrEnv, ImportAvails)
-
+rnImports :: [LImportDecl RdrName] -> RnM [LImportDecl Name]
rnImports imports
- = do { -- PROCESS IMPORT DECLS
- -- Do the non {- SOURCE -} ones first, so that we get a helpful
- -- warning for {- SOURCE -} ones that are unnecessary
- this_mod <- getModule
- ; implicit_prelude <- doptM Opt_ImplicitPrelude
- ; let
- all_imports = mk_prel_imports this_mod implicit_prelude ++ imports
- (source, ordinary) = partition is_source_import all_imports
- is_source_import (L _ (ImportDecl _ is_boot _ _ _)) = is_boot
-
- get_imports = importsFromImportDecl this_mod
-
- ; stuff1 <- mappM get_imports ordinary
- ; stuff2 <- mappM get_imports source
-
- -- COMBINE RESULTS
- ; let
- (imp_gbl_envs, imp_avails) = unzip (stuff1 ++ stuff2)
- gbl_env :: GlobalRdrEnv
- gbl_env = foldr plusGlobalRdrEnv emptyGlobalRdrEnv imp_gbl_envs
-
- all_avails :: ImportAvails
- all_avails = foldr plusImportAvails emptyImportAvails imp_avails
-
- -- ALL DONE
- ; return (gbl_env, all_avails) }
- where
- -- NB: opt_NoImplicitPrelude is slightly different to import Prelude ();
- -- because the former doesn't even look at Prelude.hi for instance
- -- declarations, whereas the latter does.
- mk_prel_imports this_mod implicit_prelude
- | this_mod == pRELUDE
- || explicit_prelude_import
- || not implicit_prelude
- = []
-
- | otherwise = [preludeImportDecl]
-
- explicit_prelude_import
- = notNull [ () | L _ (ImportDecl mod _ _ _ _) <- imports,
- unLoc mod == pRELUDE ]
-
+ -- PROCESS IMPORT DECLS
+ -- Do the non {- SOURCE -} ones first, so that we get a helpful
+ -- warning for {- SOURCE -} ones that are unnecessary
+ = do this_mod <- getModule
+ implicit_prelude <- doptM Opt_ImplicitPrelude
+ let all_imports = mk_prel_imports this_mod implicit_prelude ++ imports
+ (source, ordinary) = partition is_source_import all_imports
+ is_source_import (L _ (ImportDecl _ is_boot _ _ _)) = is_boot
+ get_imports = importsFromImportDeclDirect this_mod
+
+ stuff1 <- mapM get_imports ordinary
+ stuff2 <- mapM get_imports source
+ return (stuff1 ++ stuff2)
+ where
+-- NB: opt_NoImplicitPrelude is slightly different to import Prelude ();
+-- because the former doesn't even look at Prelude.hi for instance
+-- declarations, whereas the latter does.
+ mk_prel_imports this_mod implicit_prelude
+ | this_mod == pRELUDE
+ || explicit_prelude_import
+ || not implicit_prelude
+ = []
+ | otherwise = [preludeImportDecl]
+ explicit_prelude_import
+ = notNull [ () | L _ (ImportDecl mod _ _ _ _) <- imports,
+ unLoc mod == pRELUDE ]
+
+preludeImportDecl :: LImportDecl RdrName
preludeImportDecl
= L loc $
ImportDecl (L loc pRELUDE)
Nothing {- No "as" -}
Nothing {- No import list -}
where
- loc = mkGeneralSrcSpan FSLIT("Implicit import declaration")
+ loc = mkGeneralSrcSpan FSLIT("Implicit import declaration")
+
+mkRdrEnvAndImports :: [LImportDecl Name] -> RnM (GlobalRdrEnv, ImportAvails)
+mkRdrEnvAndImports imports
+ = do this_mod <- getModule
+ let get_imports = importsFromImportDecl this_mod
+ stuff <- mapM get_imports imports
+ let (imp_gbl_envs, imp_avails) = unzip stuff
+ gbl_env :: GlobalRdrEnv
+ gbl_env = foldr plusGlobalRdrEnv emptyGlobalRdrEnv imp_gbl_envs
+
+ all_avails :: ImportAvails
+ all_avails = foldr plusImportAvails emptyImportAvails imp_avails
+ -- ALL DONE
+ return (gbl_env, all_avails)
+
\end{code}
\begin{code}
+rnImportDecl :: ModIface -> ImpDeclSpec -> ImportDecl RdrName -> NameSet -> RnM (ImportDecl Name)
+rnImportDecl iface decl_spec (ImportDecl loc_imp_mod_name want_boot qual_only as_mod Nothing) all_names
+ = return $ ImportDecl loc_imp_mod_name want_boot qual_only as_mod Nothing
+rnImportDecl iface decl_spec (ImportDecl loc_imp_mod_name want_boot qual_only as_mod (Just (want_hiding,import_items))) all_names
+ = do import_items_mbs <- mapM (srcSpanWrapper) import_items
+ let rn_import_items = concat . catMaybes $ import_items_mbs
+ return $ ImportDecl loc_imp_mod_name want_boot qual_only as_mod (Just (want_hiding,rn_import_items))
+ where
+ srcSpanWrapper (L span ieRdr)
+ = setSrcSpan span $
+ case get_item ieRdr of
+ Nothing
+ -> do addErr (badImportItemErr iface decl_spec ieRdr)
+ return Nothing
+ Just ieNames
+ -> return (Just [L span ie | ie <- ieNames])
+ occ_env :: OccEnv Name -- Maps OccName to corresponding Name
+ occ_env = mkOccEnv [(nameOccName n, n) | n <- nameSetToList all_names]
+ -- This env will have entries for data constructors too,
+ -- they won't make any difference because naked entities like T
+ -- in an import list map to TcOccs, not VarOccs.
+
+ sub_env :: NameEnv [Name]
+ sub_env = mkSubNameEnv all_names
+
+ get_item :: IE RdrName -> Maybe [IE Name]
+ -- Empty result for a bad item.
+ -- Singleton result is typical case.
+ -- Can have two when we are hiding, and mention C which might be
+ -- both a class and a data constructor.
+ get_item item@(IEModuleContents _)
+ = Nothing
+
+ get_item (IEThingAll tc)
+ = do name <- check_name tc
+ return [IEThingAll name]
+{-
+ -> -- This occurs when you import T(..), but
+ -- only export T abstractly. The single [n]
+ -- in the AvailTC is the type or class itself
+ ifOptM Opt_WarnDodgyImports (addWarn (dodgyImportWarn tc)) `thenM_`
+ return [ IEThingAll n ]
+
+ names -> return [ IEThingAll n | n <- names ]
+-}
+
+ get_item (IEThingAbs tc)
+ | want_hiding -- hiding ( C )
+ -- Here the 'C' can be a data constructor
+ -- *or* a type/class, or even both
+ = case catMaybes [check_name tc, check_name (setRdrNameSpace tc srcDataName)] of
+ [] -> Nothing
+ names -> return [ IEThingAbs n | n <- names ]
+ | otherwise
+ = do name <- check_name tc
+ return [IEThingAbs name]
+ get_item (IEThingWith n ns) -- import (C (A,B))
+ = do name <- check_name n
+ let env = mkOccEnv [(nameOccName s, s) | s <- subNames sub_env name]
+ mb_names = map (lookupOccEnv env . rdrNameOcc) ns
+ names <- sequence mb_names
+ return [IEThingWith name names]
+
+ get_item (IEVar n)
+ = do name <- check_name n
+ return [IEVar name]
+
+ check_name :: RdrName -> Maybe Name
+ check_name rdrName
+ = lookupOccEnv occ_env (rdrNameOcc rdrName)
+
+
+importsFromImportDeclDirect :: Module
+ -> LImportDecl RdrName
+ -> RnM (LImportDecl Name)
+importsFromImportDeclDirect this_mod
+ (L loc importDecl@(ImportDecl loc_imp_mod_name want_boot qual_only as_mod imp_details))
+ = setSrcSpan loc $
+ do iface <- loadSrcInterface doc imp_mod_name want_boot
+ -- Compiler sanity check: if the import didn't say
+ -- {-# SOURCE #-} we should not get a hi-boot file
+ WARN( not want_boot && mi_boot iface, ppr imp_mod_name ) $ do
+ -- Issue a user warning for a redundant {- SOURCE -} import
+ -- NB that we arrange to read all the ordinary imports before
+ -- any of the {- SOURCE -} imports
+ warnIf (want_boot && not (mi_boot iface))
+ (warnRedundantSourceImport imp_mod_name)
+
+ let deprecs = mi_deprecs iface
+ is_orph = mi_orphan iface
+ deps = mi_deps iface
+ filtered_exports = filter not_this_mod (mi_exports iface)
+ not_this_mod (mod,_) = mod /= this_mod
+ imp_mod = mi_module iface
+
+ -- If the module exports anything defined in this module, just ignore it.
+ -- Reason: otherwise it looks as if there are two local definition sites
+ -- for the thing, and an error gets reported. Easiest thing is just to
+ -- filter them out up front. This situation only arises if a module
+ -- imports itself, or another module that imported it. (Necessarily,
+ -- this invoves a loop.)
+ --
+ -- Tiresome consequence: if you say
+ -- module A where
+ -- import B( AType )
+ -- type AType = ...
+ --
+ -- module B( AType ) where
+ -- import {-# SOURCE #-} A( AType )
+ --
+ -- then you'll get a 'B does not export AType' message. Oh well.
+
+ qual_mod_name = case as_mod of
+ Nothing -> imp_mod_name
+ Just another_name -> another_name
+ imp_spec = ImpDeclSpec { is_mod = imp_mod_name, is_qual = qual_only,
+ is_dloc = loc, is_as = qual_mod_name }
+
+ -- Get the total imports, and filter them according to the import list
+ total_avails <- ifaceExportNames filtered_exports
+ importDecl' <- rnImportDecl iface imp_spec importDecl total_avails
+ return (L loc importDecl')
+ where imp_mod_name = unLoc loc_imp_mod_name
+ doc = ppr imp_mod_name <+> ptext SLIT("is directly imported")
+
importsFromImportDecl :: Module
- -> LImportDecl RdrName
+ -> LImportDecl Name
-> RnM (GlobalRdrEnv, ImportAvails)
importsFromImportDecl this_mod
\begin{code}
filterImports :: ModIface
-> ImpDeclSpec -- The span for the entire import decl
- -> Maybe (Bool, [Located (IE RdrName)]) -- Import spec; True => hiding
+ -> Maybe (Bool, [LIE Name]) -- Import spec; True => hiding
-> NameSet -- What's available
-> RnM (NameSet, -- What's imported (qualified or unqualified)
GlobalRdrEnv) -- Same again, but in GRE form
imp_spec = ImpSpec { is_decl = decl_spec, is_item = ImpAll }
filterImports iface decl_spec Nothing all_names
- = returnM (all_names, mkGenericRdrEnv decl_spec all_names)
+ = return (all_names, mkGenericRdrEnv decl_spec all_names)
filterImports iface decl_spec (Just (want_hiding, import_items)) all_names
- = mappM (addLocM get_item) import_items `thenM` \ gres_s ->
- let
- gres = concat gres_s
- specified_names = mkNameSet (map gre_name gres)
- in
- if not want_hiding then
- return (specified_names, mkGlobalRdrEnv gres)
- else
- let
- keep n = not (n `elemNameSet` specified_names)
- pruned_avails = filterNameSet keep all_names
- in
- return (pruned_avails, mkGenericRdrEnv decl_spec pruned_avails)
-
+ = mapM (addLocM get_item) import_items >>= \gres_s ->
+ let gres = concat gres_s
+ specified_names = mkNameSet (map gre_name gres)
+ in if not want_hiding then
+ return (specified_names, mkGlobalRdrEnv gres)
+ else let keep n = not (n `elemNameSet` specified_names)
+ pruned_avails = filterNameSet keep all_names
+ in return (pruned_avails, mkGenericRdrEnv decl_spec pruned_avails)
where
- occ_env :: OccEnv Name -- Maps OccName to corresponding Name
- occ_env = mkOccEnv [(nameOccName n, n) | n <- nameSetToList all_names]
- -- This env will have entries for data constructors too,
- -- they won't make any difference because naked entities like T
- -- in an import list map to TcOccs, not VarOccs.
-
- sub_env :: NameEnv [Name]
+ sub_env :: NameEnv [Name] -- Classify each name by its parent
sub_env = mkSubNameEnv all_names
- bale_out item = addErr (badImportItemErr iface decl_spec item) `thenM_`
- returnM []
-
succeed_with :: Bool -> [Name] -> RnM [GlobalRdrElt]
succeed_with all_explicit names
= do { loc <- getSrcSpanM
item_spec = ImpSome { is_explicit = explicit, is_iloc = loc }
explicit = all_explicit || isNothing (nameParent_maybe name)
- get_item :: IE RdrName -> RnM [GlobalRdrElt]
+ get_item :: IE Name -> RnM [GlobalRdrElt]
-- Empty result for a bad item.
-- Singleton result is typical case.
-- Can have two when we are hiding, and mention C which might be
-- both a class and a data constructor.
get_item item@(IEModuleContents _)
- = bale_out item
+ -- This case should be filtered out by 'rnImports'.
+ = panic "filterImports: IEModuleContents?"
- get_item item@(IEThingAll tc)
- = case check_item item of
- [] -> bale_out item
+ get_item (IEThingAll name)
+ = case subNames sub_env name of
+ [] -> do ifOptM Opt_WarnDodgyImports (addWarn (dodgyImportWarn name))
+ succeed_with False [name]
+ names -> succeed_with False (name:names)
- [n] -> -- This occurs when you import T(..), but
- -- only export T abstractly. The single [n]
- -- in the AvailTC is the type or class itself
- ifOptM Opt_WarnDodgyImports (addWarn (dodgyImportWarn tc)) `thenM_`
- succeed_with False [n]
+ get_item (IEThingAbs name)
+ = succeed_with True [name]
- names -> succeed_with False names
+ get_item (IEThingWith name names)
+ = succeed_with True (name:names)
+ get_item (IEVar name)
+ = succeed_with True [name]
- get_item item@(IEThingAbs n)
- | want_hiding -- hiding( C )
- -- Here the 'C' can be a data constructor
- -- *or* a type/class, or even both
- = case concat [check_item item, check_item (IEVar data_n)] of
- [] -> bale_out item
- names -> succeed_with True names
- where
- data_n = setRdrNameSpace n srcDataName
-
- get_item item
- = case check_item item of
- [] -> bale_out item
- names -> succeed_with True names
-
- check_item :: IE RdrName -> [Name]
- check_item item
- = case lookupOccEnv occ_env (rdrNameOcc (ieName item)) of
- Nothing -> []
- Just name -> filterAvail item name sub_env
\end{code}
NameSet) -- The accumulated exported stuff
emptyExportAccum = ([], emptyOccEnv, emptyNameSet)
-type ExportOccMap = OccEnv (Name, IE RdrName)
+type ExportOccMap = OccEnv (Name, IE Name)
-- Tracks what a particular exported OccName
-- in an export list refers to, and which item
-- it came from. It's illegal to export two distinct things
-- that have the same occurrence name
-
-rnExports :: Bool -- False => no 'module M(..) where' header at all
- -> Maybe [Located (IE RdrName)] -- Nothing => no explicit export list
- -> RnM NameSet
+rnExports :: Maybe [LIE RdrName]
+ -> RnM (Maybe [LIE Name])
+rnExports Nothing = return Nothing
+rnExports (Just exports)
+ = do TcGblEnv { tcg_imports = ImportAvails { imp_env = imp_env } } <- getGblEnv
+ let sub_env :: NameEnv [Name] -- Classify each name by its parent
+ sub_env = mkSubNameEnv (foldModuleEnv unionNameSets emptyNameSet imp_env)
+ inLoc fn (L span x)
+ = do x' <- fn x
+ return (L span x')
+ rnExport (IEVar rdrName)
+ = do name <- lookupGlobalOccRn rdrName
+ return (IEVar name)
+ rnExport (IEThingAbs rdrName)
+ = do name <- lookupGlobalOccRn rdrName
+ return (IEThingAbs name)
+ rnExport (IEThingAll rdrName)
+ = do name <- lookupGlobalOccRn rdrName
+ return (IEThingAll name)
+ rnExport (IEThingWith rdrName rdrNames)
+ = do name <- lookupGlobalOccRn rdrName
+ let env = mkOccEnv [(nameOccName s, s) | s <- subNames sub_env name]
+ mb_names = map (lookupOccEnv env . rdrNameOcc) rdrNames
+ if any isNothing mb_names
+ then -- The export error will be reporting in 'mkExportNameSet'
+ return (IEThingWith name [])
+ else return (IEThingWith name (catMaybes mb_names))
+ rnExport (IEModuleContents mod)
+ = return (IEModuleContents mod)
+ rn_exports <- mapM (inLoc rnExport) exports
+ return (Just rn_exports)
+
+mkExportNameSet :: Bool -- False => no 'module M(..) where' header at all
+ -> Maybe [LIE Name] -- Nothing => no explicit export list
+ -> RnM NameSet
-- Complains if two distinct exports have same OccName
-- Warns about identical exports.
-- Complains about exports items not in scope
-rnExports explicit_mod exports
- = do { TcGblEnv { tcg_rdr_env = rdr_env,
- tcg_imports = imports } <- getGblEnv ;
+mkExportNameSet explicit_mod exports
+ = do TcGblEnv { tcg_rdr_env = rdr_env,
+ tcg_imports = imports } <- getGblEnv
-- If the module header is omitted altogether, then behave
-- as if the user had written "module Main(main) where..."
-- written "module Main where ..."
-- Reason: don't want to complain about 'main' not in scope
-- in interactive mode
- ghci_mode <- getGhciMode ;
- let { real_exports
- | explicit_mod = exports
- | ghci_mode == Interactive = Nothing
- | otherwise = Just [noLoc (IEVar main_RDR_Unqual)] } ;
+ ghci_mode <- getGhciMode
+ real_exports <- case () of
+ () | explicit_mod
+ -> return exports
+ | ghci_mode == Interactive
+ -> return Nothing
+ | otherwise
+ -> do mainName <- lookupGlobalOccRn main_RDR_Unqual
+ return (Just [noLoc (IEVar mainName)])
-- ToDo: the 'noLoc' here is unhelpful if 'main' turns out to be out of scope
- exports_from_avail real_exports rdr_env imports }
+ exports_from_avail real_exports rdr_env imports
exports_from_avail Nothing rdr_env imports
isLocalGRE gre ])
exports_from_avail (Just items) rdr_env (ImportAvails { imp_env = imp_env })
- = foldlM do_litem emptyExportAccum items `thenM` \ (_, _, exports) ->
- returnM exports
+ = do (_, _, exports) <- foldlM do_litem emptyExportAccum items
+ return exports
where
sub_env :: NameEnv [Name] -- Classify each name by its parent
sub_env = mkSubNameEnv (foldModuleEnv unionNameSets emptyNameSet imp_env)
- do_litem :: ExportAccum -> Located (IE RdrName) -> RnM ExportAccum
+ do_litem :: ExportAccum -> LIE Name -> RnM ExportAccum
do_litem acc = addLocM (exports_from_item acc)
- exports_from_item :: ExportAccum -> IE RdrName -> RnM ExportAccum
+ exports_from_item :: ExportAccum -> IE Name -> RnM ExportAccum
exports_from_item acc@(mods, occs, exports) ie@(IEModuleContents mod)
| mod `elem` mods -- Duplicate export of M
= do { warn_dup_exports <- doptM Opt_WarnDuplicateExports ;
| otherwise
= case lookupModuleEnv imp_env mod of
- Nothing -> addErr (modExportErr mod) `thenM_`
- returnM acc
- Just names
- -> let
- new_exports = filterNameSet (inScopeUnqual rdr_env) names
- in
-
- -- This check_occs not only finds conflicts between this item
- -- and others, but also internally within this item. That is,
- -- if 'M.x' is in scope in several ways, we'll have several
- -- members of mod_avails with the same OccName.
- check_occs ie occs (nameSetToList new_exports) `thenM` \ occs' ->
- returnM (mod:mods, occs', exports `unionNameSets` new_exports)
+ Nothing -> do addErr (modExportErr mod)
+ return acc
+ Just names
+ -> do let new_exports = filterNameSet (inScopeUnqual rdr_env) names
+ -- This check_occs not only finds conflicts between this item
+ -- and others, but also internally within this item. That is,
+ -- if 'M.x' is in scope in several ways, we'll have several
+ -- members of mod_avails with the same OccName.
+ occs' <- check_occs ie occs (nameSetToList new_exports)
+ return (mod:mods, occs', exports `unionNameSets` new_exports)
exports_from_item acc@(mods, occs, exports) ie
- = lookupGlobalOccRn (ieName ie) `thenM` \ name ->
- if isUnboundName name then
- returnM acc -- Avoid error cascade
- else let
- new_exports = filterAvail ie name sub_env
- in
- checkErr (not (null new_exports)) (exportItemErr ie) `thenM_`
- checkForDodgyExport ie new_exports `thenM_`
- check_occs ie occs new_exports `thenM` \ occs' ->
- returnM (mods, occs', addListToNameSet exports new_exports)
+ = if isUnboundName (ieName ie)
+ then return acc -- Avoid error cascade
+ else let new_exports = filterAvail ie sub_env in
+ do checkErr (not (null new_exports)) (exportItemErr ie)
+ checkForDodgyExport ie new_exports
+ occs' <- check_occs ie occs new_exports
+ return (mods, occs', addListToNameSet exports new_exports)
-------------------------------
-filterAvail :: IE RdrName -- Wanted
- -> Name -- The Name of the ieName of the item
+filterAvail :: IE Name -- Wanted
-> NameEnv [Name] -- Maps type/class names to their sub-names
- -> [Name] -- Empty if even one thing reqd is missing
-
-filterAvail (IEVar _) n subs = [n]
-filterAvail (IEThingAbs _) n subs = [n]
-filterAvail (IEThingAll _) n subs = n : subNames subs n
-filterAvail (IEThingWith _ rdrs) n subs
- | any isNothing mb_names = []
- | otherwise = n : catMaybes mb_names
- where
- env = mkOccEnv [(nameOccName s, s) | s <- subNames subs n]
- mb_names = map (lookupOccEnv env . rdrNameOcc) rdrs
-filterAvail (IEModuleContents _) _ _ = panic "filterAvail"
+ -> [Name]
+
+filterAvail (IEVar n) subs = [n]
+filterAvail (IEThingAbs n) subs = [n]
+filterAvail (IEThingAll n) subs = n : subNames subs n
+filterAvail (IEThingWith n ns) subs = n : ns
+filterAvail (IEModuleContents _) _ = panic "filterAvail"
subNames :: NameEnv [Name] -> Name -> [Name]
subNames env n = lookupNameEnv env n `orElse` []
inScopeUnqual env n = any unQualOK (lookupGRE_Name env n)
-------------------------------
-checkForDodgyExport :: IE RdrName -> [Name] -> RnM ()
+checkForDodgyExport :: IE Name -> [Name] -> RnM ()
checkForDodgyExport ie@(IEThingAll tc) [n]
| isTcOcc (nameOccName n) = addWarn (dodgyExportWarn tc)
-- This occurs when you export T(..), but
checkForDodgyExport _ _ = return ()
-------------------------------
-check_occs :: IE RdrName -> ExportOccMap -> [Name] -> RnM ExportOccMap
+check_occs :: IE Name -> ExportOccMap -> [Name] -> RnM ExportOccMap
check_occs ie occs names
= foldlM check occs names
where
%*********************************************************
\begin{code}
-reportUnusedNames :: Maybe [Located (IE RdrName)] -- Export list
+reportUnusedNames :: Maybe [LIE RdrName] -- Export list
-> TcGblEnv -> RnM ()
reportUnusedNames export_decls gbl_env
= do { traceRn ((text "RUN") <+> (ppr (tcg_dus gbl_env)))
= ptext SLIT("import") <+> ppr mod_name <>
parens (fsep (punctuate comma (map ppr ies)))
- to_ies (mod, avail_env) = mappM to_ie (availEnvElts avail_env) `thenM` \ ies ->
- returnM (mod, ies)
+ to_ies (mod, avail_env) = do ies <- mapM to_ie (availEnvElts avail_env)
+ returnM (mod, ies)
to_ie :: AvailInfo -> RnM (IE Name)
-- The main trick here is that if we're importing all the constructors
projects / ghc-hetmet.git / commitdiff