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
42 import RdrName ( RdrName, rdrNameOcc, setRdrNameOcc, mkRdrQual, mkRdrUnqual, isQual, isUnqual )
43 import OccName ( setOccNameSpace, dataName )
44 import SrcLoc ( SrcLoc )
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)
84 setModuleRn this_mod $
86 -- PROCESS LOCAL DECLS
87 -- Do these *first* so that the correct provenance gets
88 -- into the global name cache.
89 importsFromLocalDecls this_mod rec_exp_fn decls
90 `thenRn` \ (local_gbl_env, local_mod_avails) ->
92 -- PROCESS IMPORT DECLS
93 -- Do the non {- SOURCE -} ones first, so that we get a helpful
94 -- warning for {- SOURCE -} ones that are unnecessary
96 (source, ordinary) = partition is_source_import all_imports
97 is_source_import (ImportDecl _ ImportByUserSource _ _ _ _) = True
98 is_source_import other = False
100 mapAndUnzipRn (importsFromImportDecl rec_unqual_fn) ordinary
101 `thenRn` \ (imp_gbl_envs1, imp_avails_s1) ->
102 mapAndUnzipRn (importsFromImportDecl rec_unqual_fn) source
103 `thenRn` \ (imp_gbl_envs2, imp_avails_s2) ->
106 -- We put the local env second, so that a local provenance
107 -- "wins", even if a module imports itself.
109 gbl_env :: GlobalRdrEnv
110 imp_gbl_env = foldr plusGlobalRdrEnv emptyRdrEnv (imp_gbl_envs2 ++ imp_gbl_envs1)
111 gbl_env = imp_gbl_env `plusGlobalRdrEnv` local_gbl_env
113 all_avails :: ExportAvails
114 all_avails = foldr plusExportAvails local_mod_avails (imp_avails_s2 ++ imp_avails_s1)
115 (_, global_avail_env) = all_avails
118 -- TRY FOR EARLY EXIT
119 -- We can't go for an early exit before this because we have to check
120 -- for name clashes. Consider:
122 -- module A where module B where
126 -- Suppose I've compiled everything up, and then I add a
127 -- new definition to module B, that defines "f".
129 -- Then I must detect the name clash in A before going for an early
130 -- exit. The early-exit code checks what's actually needed from B
131 -- to compile A, and of course that doesn't include B.f. That's
132 -- why we wait till after the plusEnv stuff to do the early-exit.
134 -- Check For eacly exit
135 checkErrsRn `thenRn` \ no_errs_so_far ->
136 if not no_errs_so_far then
137 -- Found errors already, so exit now
140 checkEarlyExit this_mod `thenRn` \ (up_to_date, old_iface) ->
142 -- Interface files are sufficiently unchanged
143 putDocRn (text "Compilation IS NOT required") `thenRn_`
147 -- RECORD BETTER PROVENANCES IN THE CACHE
148 -- The names in the envirnoment have better provenances (e.g. imported on line x)
149 -- than the names in the name cache. We update the latter now, so that we
150 -- we start renaming declarations we'll get the good names
151 -- The isQual is because the qualified name is always in scope
152 updateProvenances (concat [names | (rdr_name, names) <- rdrEnvToList gbl_env,
153 isQual rdr_name]) `thenRn_`
155 -- PROCESS EXPORT LISTS
156 exportsFromAvail this_mod exports all_avails gbl_env `thenRn` \ export_avails ->
160 returnRn (Just (gbl_env, local_gbl_env, export_avails, global_avail_env, old_iface))
163 all_imports = prel_imports ++ imports
165 -- NB: opt_NoImplicitPrelude is slightly different to import Prelude ();
166 -- because the former doesn't even look at Prelude.hi for instance declarations,
167 -- whereas the latter does.
168 prel_imports | this_mod == pRELUDE_Name ||
169 explicit_prelude_import ||
170 opt_NoImplicitPrelude
173 | otherwise = [ImportDecl pRELUDE_Name
175 False {- Not qualified -}
176 Nothing {- No "as" -}
177 Nothing {- No import list -}
180 explicit_prelude_import
181 = not (null [ () | (ImportDecl mod _ _ _ _ _) <- imports, mod == pRELUDE_Name ])
185 checkEarlyExit mod_name
186 = traceRn (text "Considering whether compilation is required...") `thenRn_`
188 -- Read the old interface file, if any, for the module being compiled
189 findAndReadIface doc_str mod_name False {- Not hi-boot -} `thenRn` \ maybe_iface ->
191 -- CHECK WHETHER WE HAVE IT ALREADY
193 Left err -> -- Old interface file not found, so we'd better bail out
194 traceRn (vcat [ptext SLIT("No old interface file for") <+> pprModuleName mod_name,
196 returnRn (outOfDate, Nothing)
199 | not opt_SourceUnchanged
200 -> -- Source code changed
201 traceRn (nest 4 (text "source file changed or recompilation check turned off")) `thenRn_`
202 returnRn (False, Just iface)
205 -> -- Source code unchanged and no errors yet... carry on
206 checkModUsage (pi_usages iface) `thenRn` \ up_to_date ->
207 returnRn (up_to_date, Just iface)
209 -- Only look in current directory, with suffix .hi
210 doc_str = sep [ptext SLIT("need usage info from"), pprModuleName mod_name]
214 importsFromImportDecl :: (Name -> Bool) -- OK to omit qualifier
216 -> RnMG (GlobalRdrEnv,
219 importsFromImportDecl is_unqual (ImportDecl imp_mod_name from qual_only as_mod import_spec iloc)
220 = pushSrcLocRn iloc $
221 getInterfaceExports imp_mod_name from `thenRn` \ (imp_mod, avails) ->
224 -- If there's an error in getInterfaceExports, (e.g. interface
225 -- file not found) we get lots of spurious errors from 'filterImports'
226 returnRn (emptyRdrEnv, mkEmptyExportAvails imp_mod_name)
229 filterImports imp_mod_name import_spec avails `thenRn` \ (filtered_avails, hides, explicits) ->
231 qualifyImports imp_mod_name
232 (not qual_only) -- Maybe want unqualified names
234 (improveAvails imp_mod iloc explicits
235 is_unqual filtered_avails)
238 improveAvails imp_mod iloc explicits is_unqual avails
239 -- We 'improve' the provenance by setting
240 -- (a) the import-reason field, so that the Name says how it came into scope
241 -- including whether it's explicitly imported
242 -- (b) the print-unqualified field
243 = map improve_avail avails
245 improve_avail (Avail n) = Avail (improve n)
246 improve_avail (AvailTC n ns) = AvailTC (improve n) (map improve ns)
248 improve name = setNameProvenance name
249 (NonLocalDef (UserImport imp_mod iloc (is_explicit name))
251 is_explicit name = name `elemNameSet` explicits
256 importsFromLocalDecls mod_name rec_exp_fn decls
257 = mapRn (getLocalDeclBinders newLocalName) decls `thenRn` \ avails_s ->
260 avails = concat avails_s
262 all_names :: [Name] -- All the defns; no dups eliminated
263 all_names = [name | avail <- avails, name <- availNames avail]
266 (_, dups) = removeDups compare all_names
268 -- Check for duplicate definitions
269 mapRn_ (addErrRn . dupDeclErr) dups `thenRn_`
271 -- Record that locally-defined things are available
272 recordLocalSlurps avails `thenRn_`
274 -- Build the environment
275 qualifyImports mod_name
276 True -- Want unqualified names
282 mod = mkThisModule mod_name
284 newLocalName rdr_name loc
285 = check_unqual rdr_name loc `thenRn_`
286 newTopBinder mod (rdrNameOcc rdr_name) `thenRn` \ name ->
287 returnRn (setNameProvenance name (LocalDef loc (rec_exp_fn name)))
289 -- There should never be a qualified name in a binding position (except in instance decls)
290 -- The parser doesn't check this because the same parser parses instance decls
291 check_unqual rdr_name loc
292 | isUnqual rdr_name = returnRn ()
293 | otherwise = qualNameErr (text "the binding for" <+> quotes (ppr rdr_name))
296 getLocalDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function
299 getLocalDeclBinders new_name (ValD binds)
300 = mapRn do_one (bagToList (collectTopBinders binds))
302 do_one (rdr_name, loc) = new_name rdr_name loc `thenRn` \ name ->
303 returnRn (Avail name)
305 getLocalDeclBinders new_name decl
306 = getDeclBinders new_name decl `thenRn` \ maybe_avail ->
308 Nothing -> returnRn [] -- Instance decls and suchlike
309 Just avail -> getDeclSysBinders new_sys_name decl `thenRn_`
312 -- The getDeclSysBinders is just to get the names of superclass selectors
313 -- etc, into the cache
314 new_sys_name rdr_name loc = newImplicitBinder (rdrNameOcc rdr_name) loc
317 %************************************************************************
319 \subsection{Filtering imports}
321 %************************************************************************
323 @filterImports@ takes the @ExportEnv@ telling what the imported module makes
324 available, and filters it through the import spec (if any).
327 filterImports :: ModuleName -- The module being imported
328 -> Maybe (Bool, [RdrNameIE]) -- Import spec; True => hiding
329 -> [AvailInfo] -- What's available
330 -> RnMG ([AvailInfo], -- What's actually imported
331 [AvailInfo], -- What's to be hidden
332 -- (the unqualified version, that is)
333 -- (We need to return both the above sets, because
334 -- the qualified version is never hidden; so we can't
335 -- implement hiding by reducing what's imported.)
336 NameSet) -- What was imported explicitly
338 -- Complains if import spec mentions things that the module doesn't export
339 -- Warns/informs if import spec contains duplicates.
340 filterImports mod Nothing imports
341 = returnRn (imports, [], emptyNameSet)
343 filterImports mod (Just (want_hiding, import_items)) avails
344 = flatMapRn get_item import_items `thenRn` \ avails_w_explicits ->
346 (item_avails, explicits_s) = unzip avails_w_explicits
347 explicits = foldl addListToNameSet emptyNameSet explicits_s
351 -- All imported; item_avails to be hidden
352 returnRn (avails, item_avails, emptyNameSet)
354 -- Just item_avails imported; nothing to be hidden
355 returnRn (item_avails, [], explicits)
357 import_fm :: FiniteMap OccName AvailInfo
358 import_fm = listToFM [ (nameOccName name, avail)
360 name <- availNames avail]
361 -- Even though availNames returns data constructors too,
362 -- they won't make any difference because naked entities like T
363 -- in an import list map to TcOccs, not VarOccs.
365 bale_out item = addErrRn (badImportItemErr mod item) `thenRn_`
368 get_item item@(IEModuleContents _) = bale_out item
370 get_item item@(IEThingAll _)
371 = case check_item item of
372 Nothing -> bale_out item
373 Just avail@(AvailTC _ [n]) -> -- This occurs when you import T(..), but
374 -- only export T abstractly. The single [n]
375 -- in the AvailTC is the type or class itself
376 addWarnRn (dodgyImportWarn mod item) `thenRn_`
377 returnRn [(avail, [availName avail])]
378 Just avail -> returnRn [(avail, [availName avail])]
380 get_item item@(IEThingAbs n)
381 | want_hiding -- hiding( C )
382 -- Here the 'C' can be a data constructor *or* a type/class
383 = case catMaybes [check_item item, check_item (IEThingAbs data_n)] of
385 avails -> returnRn [(a, []) | a <- avails]
386 -- The 'explicits' list is irrelevant when hiding
388 data_n = setRdrNameOcc n (setOccNameSpace (rdrNameOcc n) dataName)
391 = case check_item item of
392 Nothing -> bale_out item
393 Just avail -> returnRn [(avail, availNames avail)]
396 | not (maybeToBool maybe_in_import_avails) ||
397 not (maybeToBool maybe_filtered_avail)
401 = Just filtered_avail
404 wanted_occ = rdrNameOcc (ieName item)
405 maybe_in_import_avails = lookupFM import_fm wanted_occ
407 Just avail = maybe_in_import_avails
408 maybe_filtered_avail = filterAvail item avail
409 Just filtered_avail = maybe_filtered_avail
414 %************************************************************************
416 \subsection{Qualifiying imports}
418 %************************************************************************
420 @qualifyImports@ takes the @ExportEnv@ after filtering through the import spec
421 of an import decl, and deals with producing an @RnEnv@ with the
422 right qualified names. It also turns the @Names@ in the @ExportEnv@ into
423 fully fledged @Names@.
426 qualifyImports :: ModuleName -- Imported module
427 -> Bool -- True <=> want unqualified import
428 -> Maybe ModuleName -- Optional "as M" part
429 -> [AvailInfo] -- What's to be hidden
430 -> Avails -- Whats imported and how
431 -> RnMG (GlobalRdrEnv, ExportAvails)
433 qualifyImports this_mod unqual_imp as_mod hides avails
435 -- Make the name environment. We're talking about a
436 -- single module here, so there must be no name clashes.
437 -- In practice there only ever will be if it's the module
440 -- Add the things that are available
441 name_env1 = foldl add_avail emptyRdrEnv avails
443 -- Delete things that are hidden
444 name_env2 = foldl del_avail name_env1 hides
446 -- Create the export-availability info
447 export_avails = mkExportAvails qual_mod unqual_imp name_env2 avails
449 returnRn (name_env2, export_avails)
452 qual_mod = case as_mod of
454 Just another_name -> another_name
456 add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv
457 add_avail env avail = foldl add_name env (availNames avail)
463 env1 = addOneToGlobalRdrEnv env (mkRdrQual qual_mod occ) name
464 env2 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) name
465 occ = nameOccName name
467 del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names
469 rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail)
472 mkEmptyExportAvails :: ModuleName -> ExportAvails
473 mkEmptyExportAvails mod_name = (unitFM mod_name [], emptyUFM)
475 mkExportAvails :: ModuleName -> Bool -> GlobalRdrEnv -> [AvailInfo] -> ExportAvails
476 mkExportAvails mod_name unqual_imp name_env avails
477 = (mod_avail_env, entity_avail_env)
479 mod_avail_env = unitFM mod_name unqual_avails
481 -- unqual_avails is the Avails that are visible in *unqualfied* form
482 -- (1.4 Report, Section 5.1.1)
484 -- import T hiding( f )
485 -- we delete f from avails
487 unqual_avails | not unqual_imp = [] -- Short cut when no unqualified imports
488 | otherwise = mapMaybe prune avails
490 prune (Avail n) | unqual_in_scope n = Just (Avail n)
491 prune (Avail n) | otherwise = Nothing
492 prune (AvailTC n ns) | null uqs = Nothing
493 | otherwise = Just (AvailTC n uqs)
495 uqs = filter unqual_in_scope ns
497 unqual_in_scope n = unQualInScope name_env n
499 entity_avail_env = listToUFM [ (name,avail) | avail <- avails,
500 name <- availNames avail]
502 plusExportAvails :: ExportAvails -> ExportAvails -> ExportAvails
503 plusExportAvails (m1, e1) (m2, e2)
504 = (plusFM_C (++) m1 m2, plusAvailEnv e1 e2)
505 -- ToDo: wasteful: we do this once for each constructor!
509 %************************************************************************
511 \subsection{Export list processing}
513 %************************************************************************
515 Processing the export list.
517 You might think that we should record things that appear in the export list
518 as ``occurrences'' (using @addOccurrenceName@), but you'd be wrong.
519 We do check (here) that they are in scope,
520 but there is no need to slurp in their actual declaration
521 (which is what @addOccurrenceName@ forces).
523 Indeed, doing so would big trouble when
524 compiling @PrelBase@, because it re-exports @GHC@, which includes @takeMVar#@,
525 whose type includes @ConcBase.StateAndSynchVar#@, and so on...
528 type ExportAccum -- The type of the accumulating parameter of
529 -- the main worker function in exportsFromAvail
530 = ([ModuleName], -- 'module M's seen so far
531 ExportOccMap, -- Tracks exported occurrence names
532 AvailEnv) -- The accumulated exported stuff, kept in an env
533 -- so we can common-up related AvailInfos
535 type ExportOccMap = FiniteMap OccName (Name, RdrNameIE)
536 -- Tracks what a particular exported OccName
537 -- in an export list refers to, and which item
538 -- it came from. It's illegal to export two distinct things
539 -- that have the same occurrence name
542 exportsFromAvail :: ModuleName
543 -> Maybe [RdrNameIE] -- Export spec
547 -- Complains if two distinct exports have same OccName
548 -- Warns about identical exports.
549 -- Complains about exports items not in scope
550 exportsFromAvail this_mod Nothing export_avails global_name_env
551 = exportsFromAvail this_mod true_exports export_avails global_name_env
553 true_exports = Just $ if this_mod == mAIN_Name
554 then [IEVar main_RDR]
555 -- export Main.main *only* unless otherwise specified,
556 else [IEModuleContents this_mod]
557 -- but for all other modules export everything.
559 exportsFromAvail this_mod (Just export_items)
560 (mod_avail_env, entity_avail_env)
562 = foldlRn exports_from_item
563 ([], emptyFM, emptyAvailEnv) export_items `thenRn` \ (_, _, export_avail_map) ->
565 export_avails :: [AvailInfo]
566 export_avails = nameEnvElts export_avail_map
568 returnRn export_avails
571 exports_from_item :: ExportAccum -> RdrNameIE -> RnMG ExportAccum
573 exports_from_item acc@(mods, occs, avails) ie@(IEModuleContents mod)
574 | mod `elem` mods -- Duplicate export of M
575 = warnCheckRn opt_WarnDuplicateExports
576 (dupModuleExport mod) `thenRn_`
580 = case lookupFM mod_avail_env mod of
581 Nothing -> failWithRn acc (modExportErr mod)
582 Just mod_avails -> foldlRn (check_occs ie) occs mod_avails
585 avails' = foldl addAvail avails mod_avails
587 returnRn (mod:mods, occs', avails')
589 exports_from_item acc@(mods, occs, avails) ie
590 | not (maybeToBool maybe_in_scope)
591 = failWithRn acc (unknownNameErr (ieName ie))
593 | not (null dup_names)
594 = addNameClashErrRn rdr_name (name:dup_names) `thenRn_`
598 -- I can't see why this should ever happen; if the thing is in scope
599 -- at all it ought to have some availability
600 | not (maybeToBool maybe_avail)
601 = pprTrace "exportsFromAvail: curious Nothing:" (ppr name)
606 = failWithRn acc (exportItemErr ie)
608 | otherwise -- Phew! It's OK! Now to check the occurrence stuff!
611 = warnCheckRn (ok_item ie avail) (dodgyExportWarn ie) `thenRn_`
612 check_occs ie occs export_avail `thenRn` \ occs' ->
613 returnRn (mods, occs', addAvail avails export_avail)
617 maybe_in_scope = lookupFM global_name_env rdr_name
618 Just (name:dup_names) = maybe_in_scope
619 maybe_avail = lookupUFM entity_avail_env name
620 Just avail = maybe_avail
621 maybe_export_avail = filterAvail ie avail
622 enough_avail = maybeToBool maybe_export_avail
623 Just export_avail = maybe_export_avail
625 ok_item (IEThingAll _) (AvailTC _ [n]) = False
626 -- This occurs when you import T(..), but
627 -- only export T abstractly. The single [n]
628 -- in the AvailTC is the type or class itself
631 check_occs :: RdrNameIE -> ExportOccMap -> AvailInfo -> RnMG ExportOccMap
632 check_occs ie occs avail
633 = foldlRn check occs (availNames avail)
636 = case lookupFM occs name_occ of
637 Nothing -> returnRn (addToFM occs name_occ (name, ie))
639 | name == name' -> -- Duplicate export
640 warnCheckRn opt_WarnDuplicateExports
641 (dupExportWarn name_occ ie ie')
642 `thenRn_` returnRn occs
644 | otherwise -> -- Same occ name but different names: an error
645 failWithRn occs (exportClashErr name_occ ie ie')
647 name_occ = nameOccName name
649 mk_export_fn :: NameSet -> (Name -> ExportFlag)
650 mk_export_fn exported_names
651 = \name -> if name `elemNameSet` exported_names
656 %************************************************************************
660 %************************************************************************
663 badImportItemErr mod ie
664 = sep [ptext SLIT("Module"), quotes (pprModuleName mod),
665 ptext SLIT("does not export"), quotes (ppr ie)]
667 dodgyImportWarn mod item = dodgyMsg (ptext SLIT("import")) item
668 dodgyExportWarn item = dodgyMsg (ptext SLIT("export")) item
670 dodgyMsg kind item@(IEThingAll tc)
671 = sep [ ptext SLIT("The") <+> kind <+> ptext SLIT("item") <+> quotes (ppr item),
672 ptext SLIT("suggests that") <+> quotes (ppr tc) <+> ptext SLIT("has constructor or class methods"),
673 ptext SLIT("but it has none; it is a type synonym or abstract type or class") ]
676 = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (pprModuleName mod)]
678 exportItemErr export_item
679 = sep [ ptext SLIT("The export item") <+> quotes (ppr export_item),
680 ptext SLIT("attempts to export constructors or class methods that are not visible here") ]
682 exportClashErr occ_name ie1 ie2
683 = hsep [ptext SLIT("The export items"), quotes (ppr ie1)
684 ,ptext SLIT("and"), quotes (ppr ie2)
685 ,ptext SLIT("create conflicting exports for"), quotes (ppr occ_name)]
688 = vcat [ptext SLIT("Multiple declarations of") <+> quotes (ppr n),
689 nest 4 (vcat (map pp sorted_ns))]
691 sorted_ns = sortLt occ'ed_before (n:ns)
693 occ'ed_before a b = LT == compare (getSrcLoc a) (getSrcLoc b)
695 pp n = pprProvenance (getNameProvenance n)
697 dupExportWarn occ_name ie1 ie2
698 = hsep [quotes (ppr occ_name),
699 ptext SLIT("is exported by"), quotes (ppr ie1),
700 ptext SLIT("and"), quotes (ppr ie2)]
703 = hsep [ptext SLIT("Duplicate"),
704 quotes (ptext SLIT("Module") <+> pprModuleName mod),
705 ptext SLIT("in export list")]