2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[RnNames]{Extracting imported and top-level names in scope}
11 #include "HsVersions.h"
13 import CmdLineOpts ( opt_NoImplicitPrelude, opt_WarnDuplicateExports,
14 opt_SourceUnchanged, opt_WarnUnusedBinds
17 import HsSyn ( HsModule(..), HsDecl(..), TyClDecl(..),
19 ForeignDecl(..), ForKind(..), isDynamicExtName,
20 FixitySig(..), Sig(..), ImportDecl(..),
23 import RdrHsSyn ( RdrNameIE, RdrNameImportDecl,
24 RdrNameHsModule, RdrNameHsDecl
26 import RnIfaces ( getInterfaceExports, getDeclBinders, getDeclSysBinders,
27 recordLocalSlurps, checkModUsage, findAndReadIface, outOfDate
33 import PrelInfo ( pRELUDE_Name, mAIN_Name, main_RDR )
34 import UniqFM ( lookupUFM )
35 import Bag ( bagToList )
36 import Module ( ModuleName, mkThisModule, pprModuleName, WhereFrom(..) )
38 import Name ( Name, ExportFlag(..), ImportReason(..), Provenance(..),
39 isLocallyDefined, setNameProvenance,
40 nameOccName, getSrcLoc, pprProvenance, getNameProvenance,
43 import RdrName ( RdrName, rdrNameOcc, setRdrNameOcc, mkRdrQual, mkRdrUnqual, isQual, isUnqual )
44 import OccName ( setOccNameSpace, dataName )
45 import NameSet ( elemNameSet, emptyNameSet )
47 import Maybes ( maybeToBool, catMaybes, mapMaybe )
48 import UniqFM ( emptyUFM, listToUFM, plusUFM_C )
49 import Util ( removeDups, equivClassesByUniq, sortLt )
50 import List ( partition )
55 %************************************************************************
57 \subsection{Get global names}
59 %************************************************************************
62 getGlobalNames :: RdrNameHsModule
63 -> RnMG (Maybe (GlobalRdrEnv, -- Maps all in-scope things
64 GlobalRdrEnv, -- Maps just *local* things
65 Avails, -- The exported stuff
66 AvailEnv, -- Maps a name to its parent AvailInfo
67 -- Just for in-scope things only
68 Maybe ParsedIface -- The old interface file, if any
70 -- Nothing => no need to recompile
72 getGlobalNames (HsModule this_mod _ exports imports decls _ mod_loc)
73 = -- These two fix-loops are to get the right
74 -- provenance information into a Name
75 fixRn ( \ ~(Just (rec_gbl_env, _, rec_export_avails, _, _)) ->
78 rec_unqual_fn :: Name -> Bool -- Is this chap in scope unqualified?
79 rec_unqual_fn = unQualInScope rec_gbl_env
81 rec_exp_fn :: Name -> ExportFlag
82 rec_exp_fn = mk_export_fn (availsToNameSet rec_export_avails)
85 -- PROCESS LOCAL DECLS
86 -- Do these *first* so that the correct provenance gets
87 -- into the global name cache.
88 importsFromLocalDecls this_mod rec_exp_fn decls
89 `thenRn` \ (local_gbl_env, local_mod_avails) ->
91 -- PROCESS IMPORT DECLS
92 -- Do the non {- SOURCE -} ones first, so that we get a helpful
93 -- warning for {- SOURCE -} ones that are unnecessary
95 (source, ordinary) = partition is_source_import all_imports
96 is_source_import (ImportDecl _ ImportByUserSource _ _ _ _) = True
97 is_source_import other = False
99 mapAndUnzipRn (importsFromImportDecl rec_unqual_fn) ordinary
100 `thenRn` \ (imp_gbl_envs1, imp_avails_s1) ->
101 mapAndUnzipRn (importsFromImportDecl rec_unqual_fn) source
102 `thenRn` \ (imp_gbl_envs2, imp_avails_s2) ->
105 -- We put the local env second, so that a local provenance
106 -- "wins", even if a module imports itself.
108 gbl_env :: GlobalRdrEnv
109 imp_gbl_env = foldr plusGlobalRdrEnv emptyRdrEnv (imp_gbl_envs2 ++ imp_gbl_envs1)
110 gbl_env = imp_gbl_env `plusGlobalRdrEnv` local_gbl_env
112 all_avails :: ExportAvails
113 all_avails = foldr plusExportAvails local_mod_avails (imp_avails_s2 ++ imp_avails_s1)
114 (_, global_avail_env) = all_avails
117 -- TRY FOR EARLY EXIT
118 -- We can't go for an early exit before this because we have to check
119 -- for name clashes. Consider:
121 -- module A where module B where
125 -- Suppose I've compiled everything up, and then I add a
126 -- new definition to module B, that defines "f".
128 -- Then I must detect the name clash in A before going for an early
129 -- exit. The early-exit code checks what's actually needed from B
130 -- to compile A, and of course that doesn't include B.f. That's
131 -- why we wait till after the plusEnv stuff to do the early-exit.
133 -- Check For eacly exit
134 checkErrsRn `thenRn` \ no_errs_so_far ->
135 if not no_errs_so_far then
136 -- Found errors already, so exit now
139 checkEarlyExit this_mod `thenRn` \ (up_to_date, old_iface) ->
141 -- Interface files are sufficiently unchanged
142 putDocRn (text "Compilation IS NOT required") `thenRn_`
146 -- RECORD BETTER PROVENANCES IN THE CACHE
147 -- The names in the envirnoment have better provenances (e.g. imported on line x)
148 -- than the names in the name cache. We update the latter now, so that we
149 -- we start renaming declarations we'll get the good names
150 -- The isQual is because the qualified name is always in scope
151 updateProvenances (concat [names | (rdr_name, names) <- rdrEnvToList gbl_env,
152 isQual rdr_name]) `thenRn_`
154 -- PROCESS EXPORT LISTS
155 exportsFromAvail this_mod exports all_avails gbl_env `thenRn` \ export_avails ->
159 returnRn (Just (gbl_env, local_gbl_env, export_avails, global_avail_env, old_iface))
162 all_imports = prel_imports ++ imports
164 -- NB: opt_NoImplicitPrelude is slightly different to import Prelude ();
165 -- because the former doesn't even look at Prelude.hi for instance declarations,
166 -- whereas the latter does.
167 prel_imports | this_mod == pRELUDE_Name ||
168 explicit_prelude_import ||
169 opt_NoImplicitPrelude
172 | otherwise = [ImportDecl pRELUDE_Name
174 False {- Not qualified -}
175 Nothing {- No "as" -}
176 Nothing {- No import list -}
179 explicit_prelude_import
180 = not (null [ () | (ImportDecl mod _ _ _ _ _) <- imports, mod == pRELUDE_Name ])
184 checkEarlyExit mod_name
185 = traceRn (text "Considering whether compilation is required...") `thenRn_`
187 -- Read the old interface file, if any, for the module being compiled
188 findAndReadIface doc_str mod_name False {- Not hi-boot -} `thenRn` \ maybe_iface ->
190 -- CHECK WHETHER WE HAVE IT ALREADY
192 Left err -> -- Old interface file not found, so we'd better bail out
193 traceRn (vcat [ptext SLIT("No old interface file for") <+> pprModuleName mod_name,
195 returnRn (outOfDate, Nothing)
198 | not opt_SourceUnchanged
199 -> -- Source code changed
200 traceRn (nest 4 (text "source file changed or recompilation check turned off")) `thenRn_`
201 returnRn (False, Just iface)
204 -> -- Source code unchanged and no errors yet... carry on
205 checkModUsage (pi_usages iface) `thenRn` \ up_to_date ->
206 returnRn (up_to_date, Just iface)
208 -- Only look in current directory, with suffix .hi
209 doc_str = sep [ptext SLIT("need usage info from"), pprModuleName mod_name]
213 importsFromImportDecl :: (Name -> Bool) -- OK to omit qualifier
215 -> RnMG (GlobalRdrEnv,
218 importsFromImportDecl is_unqual (ImportDecl imp_mod_name from qual_only as_mod import_spec iloc)
219 = pushSrcLocRn iloc $
220 getInterfaceExports imp_mod_name from `thenRn` \ (imp_mod, avails) ->
223 -- If there's an error in getInterfaceExports, (e.g. interface
224 -- file not found) we get lots of spurious errors from 'filterImports'
225 returnRn (emptyRdrEnv, mkEmptyExportAvails imp_mod_name)
228 filterImports imp_mod_name import_spec avails `thenRn` \ (filtered_avails, hides, explicits) ->
230 qualifyImports imp_mod_name
231 (not qual_only) -- Maybe want unqualified names
233 (improveAvails imp_mod iloc explicits
234 is_unqual filtered_avails)
237 improveAvails imp_mod iloc explicits is_unqual avails
238 -- We 'improve' the provenance by setting
239 -- (a) the import-reason field, so that the Name says how it came into scope
240 -- including whether it's explicitly imported
241 -- (b) the print-unqualified field
242 = map improve_avail avails
244 improve_avail (Avail n) = Avail (improve n)
245 improve_avail (AvailTC n ns) = AvailTC (improve n) (map improve ns)
247 improve name = setNameProvenance name
248 (NonLocalDef (UserImport imp_mod iloc (is_explicit name))
250 is_explicit name = name `elemNameSet` explicits
255 importsFromLocalDecls mod_name rec_exp_fn decls
256 = mapRn (getLocalDeclBinders mod rec_exp_fn) decls `thenRn` \ avails_s ->
259 avails = concat avails_s
261 all_names :: [Name] -- All the defns; no dups eliminated
262 all_names = [name | avail <- avails, name <- availNames avail]
265 (_, dups) = removeDups compare all_names
267 -- Check for duplicate definitions
268 mapRn_ (addErrRn . dupDeclErr) dups `thenRn_`
270 -- Record that locally-defined things are available
271 recordLocalSlurps avails `thenRn_`
273 -- Build the environment
274 qualifyImports mod_name
275 True -- Want unqualified names
281 mod = mkThisModule mod_name
283 getLocalDeclBinders :: Module -> (Name -> ExportFlag)
284 -> RdrNameHsDecl -> RnMG Avails
285 getLocalDeclBinders mod rec_exp_fn (ValD binds)
286 = mapRn do_one (bagToList (collectTopBinders binds))
288 do_one (rdr_name, loc) = newLocalName mod rec_exp_fn rdr_name loc `thenRn` \ name ->
289 returnRn (Avail name)
291 getLocalDeclBinders mod rec_exp_fn decl
292 = getDeclBinders (newLocalName mod rec_exp_fn) decl `thenRn` \ maybe_avail ->
294 Nothing -> returnRn [] -- Instance decls and suchlike
295 Just avail -> returnRn [avail]
297 newLocalName mod rec_exp_fn rdr_name loc
298 = check_unqual rdr_name loc `thenRn_`
299 newTopBinder mod (rdrNameOcc rdr_name) `thenRn` \ name ->
300 returnRn (setNameProvenance name (LocalDef loc (rec_exp_fn name)))
302 -- There should never be a qualified name in a binding position (except in instance decls)
303 -- The parser doesn't check this because the same parser parses instance decls
304 check_unqual rdr_name loc
305 | isUnqual rdr_name = returnRn ()
306 | otherwise = qualNameErr (text "the binding for" <+> quotes (ppr rdr_name))
311 %************************************************************************
313 \subsection{Filtering imports}
315 %************************************************************************
317 @filterImports@ takes the @ExportEnv@ telling what the imported module makes
318 available, and filters it through the import spec (if any).
321 filterImports :: ModuleName -- The module being imported
322 -> Maybe (Bool, [RdrNameIE]) -- Import spec; True => hiding
323 -> [AvailInfo] -- What's available
324 -> RnMG ([AvailInfo], -- What's actually imported
325 [AvailInfo], -- What's to be hidden
326 -- (the unqualified version, that is)
327 -- (We need to return both the above sets, because
328 -- the qualified version is never hidden; so we can't
329 -- implement hiding by reducing what's imported.)
330 NameSet) -- What was imported explicitly
332 -- Complains if import spec mentions things that the module doesn't export
333 -- Warns/informs if import spec contains duplicates.
334 filterImports mod Nothing imports
335 = returnRn (imports, [], emptyNameSet)
337 filterImports mod (Just (want_hiding, import_items)) avails
338 = flatMapRn get_item import_items `thenRn` \ avails_w_explicits ->
340 (item_avails, explicits_s) = unzip avails_w_explicits
341 explicits = foldl addListToNameSet emptyNameSet explicits_s
345 -- All imported; item_avails to be hidden
346 returnRn (avails, item_avails, emptyNameSet)
348 -- Just item_avails imported; nothing to be hidden
349 returnRn (item_avails, [], explicits)
351 import_fm :: FiniteMap OccName AvailInfo
352 import_fm = listToFM [ (nameOccName name, avail)
354 name <- availNames avail]
355 -- Even though availNames returns data constructors too,
356 -- they won't make any difference because naked entities like T
357 -- in an import list map to TcOccs, not VarOccs.
359 bale_out item = addErrRn (badImportItemErr mod item) `thenRn_`
362 get_item item@(IEModuleContents _) = bale_out item
364 get_item item@(IEThingAll _)
365 = case check_item item of
366 Nothing -> bale_out item
367 Just avail@(AvailTC _ [n]) -> -- This occurs when you import T(..), but
368 -- only export T abstractly. The single [n]
369 -- in the AvailTC is the type or class itself
370 addWarnRn (dodgyImportWarn mod item) `thenRn_`
371 returnRn [(avail, [availName avail])]
372 Just avail -> returnRn [(avail, [availName avail])]
374 get_item item@(IEThingAbs n)
375 | want_hiding -- hiding( C )
376 -- Here the 'C' can be a data constructor *or* a type/class
377 = case catMaybes [check_item item, check_item (IEThingAbs data_n)] of
379 avails -> returnRn [(a, []) | a <- avails]
380 -- The 'explicits' list is irrelevant when hiding
382 data_n = setRdrNameOcc n (setOccNameSpace (rdrNameOcc n) dataName)
385 = case check_item item of
386 Nothing -> bale_out item
387 Just avail -> returnRn [(avail, availNames avail)]
390 | not (maybeToBool maybe_in_import_avails) ||
391 not (maybeToBool maybe_filtered_avail)
395 = Just filtered_avail
398 wanted_occ = rdrNameOcc (ieName item)
399 maybe_in_import_avails = lookupFM import_fm wanted_occ
401 Just avail = maybe_in_import_avails
402 maybe_filtered_avail = filterAvail item avail
403 Just filtered_avail = maybe_filtered_avail
408 %************************************************************************
410 \subsection{Qualifiying imports}
412 %************************************************************************
414 @qualifyImports@ takes the @ExportEnv@ after filtering through the import spec
415 of an import decl, and deals with producing an @RnEnv@ with the
416 right qualified names. It also turns the @Names@ in the @ExportEnv@ into
417 fully fledged @Names@.
420 qualifyImports :: ModuleName -- Imported module
421 -> Bool -- True <=> want unqualified import
422 -> Maybe ModuleName -- Optional "as M" part
423 -> [AvailInfo] -- What's to be hidden
424 -> Avails -- Whats imported and how
425 -> RnMG (GlobalRdrEnv, ExportAvails)
427 qualifyImports this_mod unqual_imp as_mod hides avails
429 -- Make the name environment. We're talking about a
430 -- single module here, so there must be no name clashes.
431 -- In practice there only ever will be if it's the module
434 -- Add the things that are available
435 name_env1 = foldl add_avail emptyRdrEnv avails
437 -- Delete things that are hidden
438 name_env2 = foldl del_avail name_env1 hides
440 -- Create the export-availability info
441 export_avails = mkExportAvails qual_mod unqual_imp name_env2 avails
443 returnRn (name_env2, export_avails)
446 qual_mod = case as_mod of
448 Just another_name -> another_name
450 add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv
451 add_avail env avail = foldl add_name env (availNames avail)
457 env1 = addOneToGlobalRdrEnv env (mkRdrQual qual_mod occ) name
458 env2 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) name
459 occ = nameOccName name
461 del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names
463 rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail)
466 mkEmptyExportAvails :: ModuleName -> ExportAvails
467 mkEmptyExportAvails mod_name = (unitFM mod_name [], emptyUFM)
469 mkExportAvails :: ModuleName -> Bool -> GlobalRdrEnv -> [AvailInfo] -> ExportAvails
470 mkExportAvails mod_name unqual_imp name_env avails
471 = (mod_avail_env, entity_avail_env)
473 mod_avail_env = unitFM mod_name unqual_avails
475 -- unqual_avails is the Avails that are visible in *unqualfied* form
476 -- (1.4 Report, Section 5.1.1)
478 -- import T hiding( f )
479 -- we delete f from avails
481 unqual_avails | not unqual_imp = [] -- Short cut when no unqualified imports
482 | otherwise = mapMaybe prune avails
484 prune (Avail n) | unqual_in_scope n = Just (Avail n)
485 prune (Avail n) | otherwise = Nothing
486 prune (AvailTC n ns) | null uqs = Nothing
487 | otherwise = Just (AvailTC n uqs)
489 uqs = filter unqual_in_scope ns
491 unqual_in_scope n = unQualInScope name_env n
493 entity_avail_env = listToUFM [ (name,avail) | avail <- avails,
494 name <- availNames avail]
496 plusExportAvails :: ExportAvails -> ExportAvails -> ExportAvails
497 plusExportAvails (m1, e1) (m2, e2)
498 = (plusFM_C (++) m1 m2, plusAvailEnv e1 e2)
499 -- ToDo: wasteful: we do this once for each constructor!
503 %************************************************************************
505 \subsection{Export list processing}
507 %************************************************************************
509 Processing the export list.
511 You might think that we should record things that appear in the export list
512 as ``occurrences'' (using @addOccurrenceName@), but you'd be wrong.
513 We do check (here) that they are in scope,
514 but there is no need to slurp in their actual declaration
515 (which is what @addOccurrenceName@ forces).
517 Indeed, doing so would big trouble when
518 compiling @PrelBase@, because it re-exports @GHC@, which includes @takeMVar#@,
519 whose type includes @ConcBase.StateAndSynchVar#@, and so on...
522 type ExportAccum -- The type of the accumulating parameter of
523 -- the main worker function in exportsFromAvail
524 = ([ModuleName], -- 'module M's seen so far
525 ExportOccMap, -- Tracks exported occurrence names
526 AvailEnv) -- The accumulated exported stuff, kept in an env
527 -- so we can common-up related AvailInfos
529 type ExportOccMap = FiniteMap OccName (Name, RdrNameIE)
530 -- Tracks what a particular exported OccName
531 -- in an export list refers to, and which item
532 -- it came from. It's illegal to export two distinct things
533 -- that have the same occurrence name
536 exportsFromAvail :: ModuleName
537 -> Maybe [RdrNameIE] -- Export spec
541 -- Complains if two distinct exports have same OccName
542 -- Warns about identical exports.
543 -- Complains about exports items not in scope
544 exportsFromAvail this_mod Nothing export_avails global_name_env
545 = exportsFromAvail this_mod true_exports export_avails global_name_env
547 true_exports = Just $ if this_mod == mAIN_Name
548 then [IEVar main_RDR]
549 -- export Main.main *only* unless otherwise specified,
550 else [IEModuleContents this_mod]
551 -- but for all other modules export everything.
553 exportsFromAvail this_mod (Just export_items)
554 (mod_avail_env, entity_avail_env)
556 = foldlRn exports_from_item
557 ([], emptyFM, emptyAvailEnv) export_items `thenRn` \ (_, _, export_avail_map) ->
559 export_avails :: [AvailInfo]
560 export_avails = nameEnvElts export_avail_map
562 returnRn export_avails
565 exports_from_item :: ExportAccum -> RdrNameIE -> RnMG ExportAccum
567 exports_from_item acc@(mods, occs, avails) ie@(IEModuleContents mod)
568 | mod `elem` mods -- Duplicate export of M
569 = warnCheckRn opt_WarnDuplicateExports
570 (dupModuleExport mod) `thenRn_`
574 = case lookupFM mod_avail_env mod of
575 Nothing -> failWithRn acc (modExportErr mod)
576 Just mod_avails -> foldlRn (check_occs ie) occs mod_avails
579 avails' = foldl addAvail avails mod_avails
581 returnRn (mod:mods, occs', avails')
583 exports_from_item acc@(mods, occs, avails) ie
584 | not (maybeToBool maybe_in_scope)
585 = failWithRn acc (unknownNameErr (ieName ie))
587 | not (null dup_names)
588 = addNameClashErrRn rdr_name (name:dup_names) `thenRn_`
592 -- I can't see why this should ever happen; if the thing is in scope
593 -- at all it ought to have some availability
594 | not (maybeToBool maybe_avail)
595 = pprTrace "exportsFromAvail: curious Nothing:" (ppr name)
600 = failWithRn acc (exportItemErr ie)
602 | otherwise -- Phew! It's OK! Now to check the occurrence stuff!
605 = warnCheckRn (ok_item ie avail) (dodgyExportWarn ie) `thenRn_`
606 check_occs ie occs export_avail `thenRn` \ occs' ->
607 returnRn (mods, occs', addAvail avails export_avail)
611 maybe_in_scope = lookupFM global_name_env rdr_name
612 Just (name:dup_names) = maybe_in_scope
613 maybe_avail = lookupUFM entity_avail_env name
614 Just avail = maybe_avail
615 maybe_export_avail = filterAvail ie avail
616 enough_avail = maybeToBool maybe_export_avail
617 Just export_avail = maybe_export_avail
619 ok_item (IEThingAll _) (AvailTC _ [n]) = False
620 -- This occurs when you import T(..), but
621 -- only export T abstractly. The single [n]
622 -- in the AvailTC is the type or class itself
625 check_occs :: RdrNameIE -> ExportOccMap -> AvailInfo -> RnMG ExportOccMap
626 check_occs ie occs avail
627 = foldlRn check occs (availNames avail)
630 = case lookupFM occs name_occ of
631 Nothing -> returnRn (addToFM occs name_occ (name, ie))
633 | name == name' -> -- Duplicate export
634 warnCheckRn opt_WarnDuplicateExports
635 (dupExportWarn name_occ ie ie')
636 `thenRn_` returnRn occs
638 | otherwise -> -- Same occ name but different names: an error
639 failWithRn occs (exportClashErr name_occ ie ie')
641 name_occ = nameOccName name
643 mk_export_fn :: NameSet -> (Name -> ExportFlag)
644 mk_export_fn exported_names
645 = \name -> if name `elemNameSet` exported_names
650 %************************************************************************
654 %************************************************************************
657 badImportItemErr mod ie
658 = sep [ptext SLIT("Module"), quotes (pprModuleName mod),
659 ptext SLIT("does not export"), quotes (ppr ie)]
661 dodgyImportWarn mod item = dodgyMsg (ptext SLIT("import")) item
662 dodgyExportWarn item = dodgyMsg (ptext SLIT("export")) item
664 dodgyMsg kind item@(IEThingAll tc)
665 = sep [ ptext SLIT("The") <+> kind <+> ptext SLIT("item") <+> quotes (ppr item),
666 ptext SLIT("suggests that") <+> quotes (ppr tc) <+> ptext SLIT("has constructor or class methods"),
667 ptext SLIT("but it has none; it is a type synonym or abstract type or class") ]
670 = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (pprModuleName mod)]
672 exportItemErr export_item
673 = sep [ ptext SLIT("The export item") <+> quotes (ppr export_item),
674 ptext SLIT("attempts to export constructors or class methods that are not visible here") ]
676 exportClashErr occ_name ie1 ie2
677 = hsep [ptext SLIT("The export items"), quotes (ppr ie1)
678 ,ptext SLIT("and"), quotes (ppr ie2)
679 ,ptext SLIT("create conflicting exports for"), quotes (ppr occ_name)]
682 = vcat [ptext SLIT("Multiple declarations of") <+> quotes (ppr n),
683 nest 4 (vcat (map pp sorted_ns))]
685 sorted_ns = sortLt occ'ed_before (n:ns)
687 occ'ed_before a b = LT == compare (getSrcLoc a) (getSrcLoc b)
689 pp n = pprProvenance (getNameProvenance n)
691 dupExportWarn occ_name ie1 ie2
692 = hsep [quotes (ppr occ_name),
693 ptext SLIT("is exported by"), quotes (ppr ie1),
694 ptext SLIT("and"), quotes (ppr ie2)]
697 = hsep [ptext SLIT("Duplicate"),
698 quotes (ptext SLIT("Module") <+> pprModuleName mod),
699 ptext SLIT("in export list")]