2 % (c) The University of Glasgow 2006
3 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
6 Loading interface files
10 -- The above warning supression flag is a temporary kludge.
11 -- While working on this module you are encouraged to remove it and fix
12 -- any warnings in the module. See
13 -- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
17 loadInterface, loadInterfaceForName, loadWiredInHomeIface,
18 loadSrcInterface, loadSysInterface, loadOrphanModules,
19 findAndReadIface, readIface, -- Used when reading the module's old interface
20 loadDecls, -- Should move to TcIface and be renamed
21 initExternalPackageState,
23 ifaceStats, pprModIface, showIface
26 #include "HsVersions.h"
28 import {-# SOURCE #-} TcIface( tcIfaceDecl, tcIfaceRules, tcIfaceInst,
29 tcIfaceFamInst, tcIfaceVectInfo )
36 import BasicTypes hiding (SuccessFlag(..))
67 %************************************************************************
69 loadSrcInterface, loadOrphanModules, loadHomeInterface
71 These three are called from TcM-land
73 %************************************************************************
76 -- | Load the interface corresponding to an @import@ directive in
77 -- source code. On a failure, fail in the monad with an error message.
78 loadSrcInterface :: SDoc -> ModuleName -> IsBootInterface -> RnM ModIface
79 loadSrcInterface doc mod want_boot = do
80 -- We must first find which Module this import refers to. This involves
81 -- calling the Finder, which as a side effect will search the filesystem
82 -- and create a ModLocation. If successful, loadIface will read the
83 -- interface; it will call the Finder again, but the ModLocation will be
84 -- cached from the first search.
86 res <- ioToIOEnv $ findImportedModule hsc_env mod Nothing
89 mb_iface <- initIfaceTcRn $ loadInterface doc mod (ImportByUser want_boot)
91 Failed err -> failWithTc err
92 Succeeded iface -> return iface
94 let dflags = hsc_dflags hsc_env in
95 failWithTc (cannotFindInterface dflags mod err)
97 -- | Load interfaces for a collection of orphan modules.
98 loadOrphanModules :: [Module] -- the modules
99 -> Bool -- these are family instance-modules
101 loadOrphanModules mods isFamInstMod
102 | null mods = returnM ()
103 | otherwise = initIfaceTcRn $
104 do { traceIf (text "Loading orphan modules:" <+>
109 load mod = loadSysInterface (mk_doc mod) mod
111 | isFamInstMod = ppr mod <+> ptext SLIT("is a family-instance module")
112 | otherwise = ppr mod <+> ptext SLIT("is a orphan-instance module")
114 -- | Loads the interface for a given Name.
115 loadInterfaceForName :: SDoc -> Name -> TcRn ModIface
116 loadInterfaceForName doc name
119 -- Should not be called with a name from the module being compiled
120 this_mod <- getModule
121 ; ASSERT2( not (nameIsLocalOrFrom this_mod name), ppr name <+> parens doc )
123 initIfaceTcRn $ loadSysInterface doc (nameModule name)
126 -- | An 'IfM' function to load the home interface for a wired-in thing,
127 -- so that we're sure that we see its instance declarations and rules
128 -- See Note [Loading instances]
129 loadWiredInHomeIface :: Name -> IfM lcl ()
130 loadWiredInHomeIface name
131 = ASSERT( isWiredInName name )
132 do loadSysInterface doc (nameModule name); return ()
134 doc = ptext SLIT("Need home interface for wired-in thing") <+> ppr name
136 -- | A wrapper for 'loadInterface' that throws an exception if it fails
137 loadSysInterface :: SDoc -> Module -> IfM lcl ModIface
138 loadSysInterface doc mod_name
139 = do { mb_iface <- loadInterface doc mod_name ImportBySystem
141 Failed err -> ghcError (ProgramError (showSDoc err))
142 Succeeded iface -> return iface }
145 Note [Loading instances]
146 ~~~~~~~~~~~~~~~~~~~~~~~~
147 We need to make sure that we have at least *read* the interface files
148 for any module with an instance decl or RULE that we might want.
150 * If the instance decl is an orphan, we have a whole separate mechanism
153 * If the instance decl not an orphan, then the act of looking at the
154 TyCon or Class will force in the defining module for the
155 TyCon/Class, and hence the instance decl
157 * BUT, if the TyCon is a wired-in TyCon, we don't really need its interface;
158 but we must make sure we read its interface in case it has instances or
159 rules. That is what LoadIface.loadWiredInHomeInterface does. It's called
160 from TcIface.{tcImportDecl, checkWiredInTyCon, ifCHeckWiredInThing}
162 All of this is done by the type checker. The renamer plays no role.
163 (It used to, but no longer.)
167 %*********************************************************
171 The main function to load an interface
172 for an imported module, and put it in
173 the External Package State
175 %*********************************************************
178 loadInterface :: SDoc -> Module -> WhereFrom
179 -> IfM lcl (MaybeErr Message ModIface)
181 -- loadInterface looks in both the HPT and PIT for the required interface
182 -- If not found, it loads it, and puts it in the PIT (always).
184 -- If it can't find a suitable interface file, we
185 -- a) modify the PackageIfaceTable to have an empty entry
186 -- (to avoid repeated complaints)
187 -- b) return (Left message)
189 -- It's not necessarily an error for there not to be an interface
190 -- file -- perhaps the module has changed, and that interface
193 loadInterface doc_str mod from
194 = do { -- Read the state
195 (eps,hpt) <- getEpsAndHpt
197 ; traceIf (text "Considering whether to load" <+> ppr mod <+> ppr from)
199 -- Check whether we have the interface already
201 ; case lookupIfaceByModule dflags hpt (eps_PIT eps) mod of {
203 -> returnM (Succeeded iface) ; -- Already loaded
204 -- The (src_imp == mi_boot iface) test checks that the already-loaded
205 -- interface isn't a boot iface. This can conceivably happen,
206 -- if an earlier import had a before we got to real imports. I think.
209 let { hi_boot_file = case from of
210 ImportByUser usr_boot -> usr_boot
211 ImportBySystem -> sys_boot
213 ; mb_dep = lookupUFM (eps_is_boot eps) (moduleName mod)
214 ; sys_boot = case mb_dep of
215 Just (_, is_boot) -> is_boot
217 -- The boot-ness of the requested interface,
218 } -- based on the dependencies in directly-imported modules
220 -- READ THE MODULE IN
221 ; read_result <- findAndReadIface doc_str mod hi_boot_file
222 ; case read_result of {
224 { let fake_iface = emptyModIface mod
226 ; updateEps_ $ \eps ->
227 eps { eps_PIT = extendModuleEnv (eps_PIT eps) (mi_module fake_iface) fake_iface }
228 -- Not found, so add an empty iface to
229 -- the EPS map so that we don't look again
231 ; returnM (Failed err) } ;
234 Succeeded (iface, file_path) -- Sanity check:
235 | ImportBySystem <- from, -- system-importing...
236 modulePackageId (mi_module iface) == thisPackage dflags,
237 -- a home-package module...
238 Nothing <- mb_dep -- that we know nothing about
239 -> returnM (Failed (badDepMsg mod))
244 loc_doc = text file_path
246 initIfaceLcl mod loc_doc $ do
248 -- Load the new ModIface into the External Package State
249 -- Even home-package interfaces loaded by loadInterface
250 -- (which only happens in OneShot mode; in Batch/Interactive
251 -- mode, home-package modules are loaded one by one into the HPT)
252 -- are put in the EPS.
254 -- The main thing is to add the ModIface to the PIT, but
256 -- IfaceDecls, IfaceInst, IfaceFamInst, IfaceRules, IfaceVectInfo
257 -- out of the ModIface and put them into the big EPS pools
259 -- NB: *first* we do loadDecl, so that the provenance of all the locally-defined
260 --- names is done correctly (notably, whether this is an .hi file or .hi-boot file).
261 -- If we do loadExport first the wrong info gets into the cache (unless we
262 -- explicitly tag each export which seems a bit of a bore)
264 ; ignore_prags <- doptM Opt_IgnoreInterfacePragmas
265 ; new_eps_decls <- loadDecls ignore_prags (mi_decls iface)
266 ; new_eps_insts <- mapM tcIfaceInst (mi_insts iface)
267 ; new_eps_fam_insts <- mapM tcIfaceFamInst (mi_fam_insts iface)
268 ; new_eps_rules <- tcIfaceRules ignore_prags (mi_rules iface)
269 ; new_eps_vect_info <- tcIfaceVectInfo mod (mkNameEnv new_eps_decls)
272 ; let { final_iface = iface {
273 mi_decls = panic "No mi_decls in PIT",
274 mi_insts = panic "No mi_insts in PIT",
275 mi_fam_insts = panic "No mi_fam_insts in PIT",
276 mi_rules = panic "No mi_rules in PIT"
280 ; updateEps_ $ \ eps ->
282 eps_PIT = extendModuleEnv (eps_PIT eps) mod final_iface,
283 eps_PTE = addDeclsToPTE (eps_PTE eps) new_eps_decls,
284 eps_rule_base = extendRuleBaseList (eps_rule_base eps)
286 eps_inst_env = extendInstEnvList (eps_inst_env eps)
288 eps_fam_inst_env = extendFamInstEnvList (eps_fam_inst_env eps)
290 eps_vect_info = plusVectInfo (eps_vect_info eps)
295 extendFamInstEnvList emptyFamInstEnv
298 extendModuleEnv (eps_mod_fam_inst_env eps)
301 eps_stats = addEpsInStats (eps_stats eps)
302 (length new_eps_decls)
303 (length new_eps_insts) (length new_eps_rules) }
305 ; return (Succeeded final_iface)
309 = hang (ptext SLIT("Interface file inconsistency:"))
310 2 (sep [ptext SLIT("home-package module") <+> quotes (ppr mod) <+> ptext SLIT("is mentioned is needed,"),
311 ptext SLIT("but is not among the dependencies of interfaces directly imported by the module being compiled")])
313 -----------------------------------------------------
314 -- Loading type/class/value decls
315 -- We pass the full Module name here, replete with
316 -- its package info, so that we can build a Name for
317 -- each binder with the right package info in it
318 -- All subsequent lookups, including crucially lookups during typechecking
319 -- the declaration itself, will find the fully-glorious Name
321 -- We handle ATs specially. They are not main declarations, but also not
322 -- implict things (in particular, adding them to `implicitTyThings' would mess
323 -- things up in the renaming/type checking of source programs).
324 -----------------------------------------------------
326 addDeclsToPTE :: PackageTypeEnv -> [(Name,TyThing)] -> PackageTypeEnv
327 addDeclsToPTE pte things = extendNameEnvList pte things
330 -> [(Version, IfaceDecl)]
331 -> IfL [(Name,TyThing)]
332 loadDecls ignore_prags ver_decls
333 = do { mod <- getIfModule
334 ; thingss <- mapM (loadDecl ignore_prags mod) ver_decls
335 ; return (concat thingss)
338 loadDecl :: Bool -- Don't load pragmas into the decl pool
340 -> (Version, IfaceDecl)
341 -> IfL [(Name,TyThing)] -- The list can be poked eagerly, but the
342 -- TyThings are forkM'd thunks
343 loadDecl ignore_prags mod (_version, decl)
344 = do { -- Populate the name cache with final versions of all
345 -- the names associated with the decl
346 main_name <- lookupOrig mod (ifName decl)
347 -- ; traceIf (text "Loading decl for " <> ppr main_name)
348 ; implicit_names <- mapM (lookupOrig mod) (ifaceDeclSubBndrs decl)
350 -- Typecheck the thing, lazily
351 -- NB. Firstly, the laziness is there in case we never need the
352 -- declaration (in one-shot mode), and secondly it is there so that
353 -- we don't look up the occurrence of a name before calling mk_new_bndr
354 -- on the binder. This is important because we must get the right name
355 -- which includes its nameParent.
357 ; thing <- forkM doc $ do { bumpDeclStats main_name
358 ; tcIfaceDecl ignore_prags decl }
360 -- Populate the type environment with the implicitTyThings too.
362 -- Note [Tricky iface loop]
363 -- ~~~~~~~~~~~~~~~~~~~~~~~~
364 -- The delicate point here is that 'mini-env' should be
365 -- buildable from 'thing' without demanding any of the things 'forkM'd
366 -- by tcIfaceDecl. For example
367 -- class C a where { data T a; op :: T a -> Int }
368 -- We return the bindings
369 -- [("C", <cls>), ("T", lookup env "T"), ("op", lookup env "op")]
370 -- The call (lookup env "T") must return the tycon T without first demanding
371 -- op; because getting the latter will look up T, hence loop.
373 -- Of course, there is no reason in principle why (lookup env "T") should demand
374 -- anything do to with op, but take care:
375 -- (a) implicitTyThings, and
376 -- (b) getOccName of all the things returned by implicitThings,
377 -- must not depend on any of the nested type-checks
379 -- All a bit too finely-balanced for my liking.
381 ; let mini_env = mkOccEnv [(getOccName t, t) | t <- implicitTyThings thing]
382 lookup n = case lookupOccEnv mini_env (getOccName n) of
385 pprPanic "loadDecl" (ppr main_name <+> ppr n $$ ppr (decl))
387 ; returnM $ (main_name, thing) : [(n, lookup n) | n <- implicit_names]
389 -- We build a list from the *known* names, with (lookup n) thunks
390 -- as the TyThings. That way we can extend the PTE without poking the
393 doc = ptext SLIT("Declaration for") <+> ppr (ifName decl)
395 bumpDeclStats :: Name -> IfL () -- Record that one more declaration has actually been used
397 = do { traceIf (text "Loading decl for" <+> ppr name)
398 ; updateEps_ (\eps -> let stats = eps_stats eps
399 in eps { eps_stats = stats { n_decls_out = n_decls_out stats + 1 } })
404 %*********************************************************
406 \subsection{Reading an interface file}
408 %*********************************************************
411 findAndReadIface :: SDoc -> Module
412 -> IsBootInterface -- True <=> Look for a .hi-boot file
413 -- False <=> Look for .hi file
414 -> TcRnIf gbl lcl (MaybeErr Message (ModIface, FilePath))
415 -- Nothing <=> file not found, or unreadable, or illegible
416 -- Just x <=> successfully found and parsed
418 -- It *doesn't* add an error to the monad, because
419 -- sometimes it's ok to fail... see notes with loadInterface
421 findAndReadIface doc_str mod hi_boot_file
422 = do { traceIf (sep [hsep [ptext SLIT("Reading"),
424 then ptext SLIT("[boot]")
426 ptext SLIT("interface for"),
428 nest 4 (ptext SLIT("reason:") <+> doc_str)])
430 -- Check for GHC.Prim, and return its static interface
433 then returnM (Succeeded (ghcPrimIface,
434 "<built in interface for GHC.Prim>"))
438 ; hsc_env <- getTopEnv
439 ; mb_found <- ioToIOEnv (findExactModule hsc_env mod)
442 err | notFound err -> do
443 { traceIf (ptext SLIT("...not found"))
445 ; returnM (Failed (cannotFindInterface dflags
446 (moduleName mod) err)) } ;
449 -- Found file, so read it
450 { let { file_path = addBootSuffix_maybe hi_boot_file (ml_hi_file loc) }
452 ; if thisPackage dflags == modulePackageId mod
453 && not (isOneShot (ghcMode dflags))
454 then returnM (Failed (homeModError mod loc))
457 ; traceIf (ptext SLIT("readIFace") <+> text file_path)
458 ; read_result <- readIface mod file_path hi_boot_file
459 ; case read_result of
460 Failed err -> returnM (Failed (badIfaceFile file_path err))
462 | mi_module iface /= mod ->
463 return (Failed (wrongIfaceModErr iface mod file_path))
465 returnM (Succeeded (iface, file_path))
466 -- Don't forget to fill in the package name...
469 notFound (Found _ _) = False
473 @readIface@ tries just the one file.
476 readIface :: Module -> FilePath -> IsBootInterface
477 -> TcRnIf gbl lcl (MaybeErr Message ModIface)
478 -- Failed err <=> file not found, or unreadable, or illegible
479 -- Succeeded iface <=> successfully found and parsed
481 readIface wanted_mod file_path is_hi_boot_file
482 = do { dflags <- getDOpts
483 ; res <- tryMostM $ readBinIface file_path
486 | wanted_mod == actual_mod -> return (Succeeded iface)
487 | otherwise -> return (Failed err)
489 actual_mod = mi_module iface
490 err = hiModuleNameMismatchWarn wanted_mod actual_mod
492 Left exn -> return (Failed (text (showException exn)))
497 %*********************************************************
499 Wired-in interface for GHC.Prim
501 %*********************************************************
504 initExternalPackageState :: ExternalPackageState
505 initExternalPackageState
507 eps_is_boot = emptyUFM,
508 eps_PIT = emptyPackageIfaceTable,
509 eps_PTE = emptyTypeEnv,
510 eps_inst_env = emptyInstEnv,
511 eps_fam_inst_env = emptyFamInstEnv,
512 eps_rule_base = mkRuleBase builtinRules,
513 -- Initialise the EPS rule pool with the built-in rules
516 eps_vect_info = noVectInfo,
517 eps_stats = EpsStats { n_ifaces_in = 0, n_decls_in = 0, n_decls_out = 0
518 , n_insts_in = 0, n_insts_out = 0
519 , n_rules_in = length builtinRules, n_rules_out = 0 }
524 %*********************************************************
526 Wired-in interface for GHC.Prim
528 %*********************************************************
531 ghcPrimIface :: ModIface
533 = (emptyModIface gHC_PRIM) {
534 mi_exports = [(gHC_PRIM, ghcPrimExports)],
536 mi_fixities = fixities,
537 mi_fix_fn = mkIfaceFixCache fixities
540 fixities = [(getOccName seqId, Fixity 0 InfixR)]
544 %*********************************************************
546 \subsection{Statistics}
548 %*********************************************************
551 ifaceStats :: ExternalPackageState -> SDoc
553 = hcat [text "Renamer stats: ", msg]
555 stats = eps_stats eps
557 [int (n_ifaces_in stats) <+> text "interfaces read",
558 hsep [ int (n_decls_out stats), text "type/class/variable imported, out of",
559 int (n_decls_in stats), text "read"],
560 hsep [ int (n_insts_out stats), text "instance decls imported, out of",
561 int (n_insts_in stats), text "read"],
562 hsep [ int (n_rules_out stats), text "rule decls imported, out of",
563 int (n_rules_in stats), text "read"]
568 %************************************************************************
572 %************************************************************************
575 -- | Read binary interface, and print it out
576 showIface :: HscEnv -> FilePath -> IO ()
577 showIface hsc_env filename = do
578 -- skip the version check; we don't want to worry about profiled vs.
579 -- non-profiled interfaces, for example.
580 writeIORef v_IgnoreHiWay True
581 iface <- initTcRnIf 's' hsc_env () () $ readBinIface filename
582 printDump (pprModIface iface)
586 pprModIface :: ModIface -> SDoc
589 = vcat [ ptext SLIT("interface")
590 <+> ppr (mi_module iface) <+> pp_boot
591 <+> ppr (mi_mod_vers iface) <+> pp_sub_vers
592 <+> (if mi_orphan iface then ptext SLIT("[orphan module]") else empty)
593 <+> (if mi_finsts iface then ptext SLIT("[family instance module]") else empty)
594 <+> (if mi_hpc iface then ptext SLIT("[hpc]") else empty)
595 <+> integer opt_HiVersion
596 <+> ptext SLIT("where")
597 , vcat (map pprExport (mi_exports iface))
598 , pprDeps (mi_deps iface)
599 , vcat (map pprUsage (mi_usages iface))
600 , pprFixities (mi_fixities iface)
601 , vcat (map pprIfaceDecl (mi_decls iface))
602 , vcat (map ppr (mi_insts iface))
603 , vcat (map ppr (mi_fam_insts iface))
604 , vcat (map ppr (mi_rules iface))
605 , pprVectInfo (mi_vect_info iface)
606 , pprDeprecs (mi_deprecs iface)
609 pp_boot | mi_boot iface = ptext SLIT("[boot]")
612 exp_vers = mi_exp_vers iface
613 rule_vers = mi_rule_vers iface
615 pp_sub_vers | exp_vers == initialVersion && rule_vers == initialVersion = empty
616 | otherwise = brackets (ppr exp_vers <+> ppr rule_vers)
619 When printing export lists, we print like this:
621 AvailTC C [C, x, y] C(x,y)
622 AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C
625 pprExport :: IfaceExport -> SDoc
626 pprExport (mod, items)
627 = hsep [ ptext SLIT("export"), ppr mod, hsep (map pp_avail items) ]
629 pp_avail :: GenAvailInfo OccName -> SDoc
630 pp_avail (Avail occ) = ppr occ
631 pp_avail (AvailTC _ []) = empty
632 pp_avail (AvailTC n (n':ns))
633 | n==n' = ppr n <> pp_export ns
634 | otherwise = ppr n <> char '|' <> pp_export (n':ns)
637 pp_export names = braces (hsep (map ppr names))
639 pprUsage :: Usage -> SDoc
641 = hsep [ptext SLIT("import"), ppr (usg_name usage),
643 pp_export_version (usg_exports usage),
644 int (usg_rules usage),
645 pp_versions (usg_entities usage) ]
647 pp_versions nvs = hsep [ ppr n <+> int v | (n,v) <- nvs ]
648 pp_export_version Nothing = empty
649 pp_export_version (Just v) = int v
651 pprDeps :: Dependencies -> SDoc
652 pprDeps (Deps { dep_mods = mods, dep_pkgs = pkgs, dep_orphs = orphs,
653 dep_finsts = finsts })
654 = vcat [ptext SLIT("module dependencies:") <+> fsep (map ppr_mod mods),
655 ptext SLIT("package dependencies:") <+> fsep (map ppr pkgs),
656 ptext SLIT("orphans:") <+> fsep (map ppr orphs),
657 ptext SLIT("family instance modules:") <+> fsep (map ppr finsts)
660 ppr_mod (mod_name, boot) = ppr mod_name <+> ppr_boot boot
661 ppr_boot True = text "[boot]"
662 ppr_boot False = empty
664 pprIfaceDecl :: (Version, IfaceDecl) -> SDoc
665 pprIfaceDecl (ver, decl)
666 = ppr_vers ver <+> ppr decl
668 -- Print the version for the decl
669 ppr_vers v | v == initialVersion = empty
672 pprFixities :: [(OccName, Fixity)] -> SDoc
673 pprFixities [] = empty
674 pprFixities fixes = ptext SLIT("fixities") <+> pprWithCommas pprFix fixes
676 pprFix (occ,fix) = ppr fix <+> ppr occ
678 pprVectInfo :: IfaceVectInfo -> SDoc
679 pprVectInfo (IfaceVectInfo { ifaceVectInfoVar = vars
680 , ifaceVectInfoTyCon = tycons
681 , ifaceVectInfoTyConReuse = tyconsReuse
684 [ ptext SLIT("vectorised variables:") <+> hsep (map ppr vars)
685 , ptext SLIT("vectorised tycons:") <+> hsep (map ppr tycons)
686 , ptext SLIT("vectorised reused tycons:") <+> hsep (map ppr tyconsReuse)
689 pprDeprecs NoDeprecs = empty
690 pprDeprecs (DeprecAll txt) = ptext SLIT("Deprecate all") <+> doubleQuotes (ftext txt)
691 pprDeprecs (DeprecSome prs) = ptext SLIT("Deprecate") <+> vcat (map pprDeprec prs)
693 pprDeprec (name, txt) = ppr name <+> doubleQuotes (ftext txt)
697 %*********************************************************
701 %*********************************************************
704 badIfaceFile file err
705 = vcat [ptext SLIT("Bad interface file:") <+> text file,
708 hiModuleNameMismatchWarn :: Module -> Module -> Message
709 hiModuleNameMismatchWarn requested_mod read_mod =
710 withPprStyle defaultUserStyle $
711 -- we want the Modules below to be qualified with package names,
712 -- so reset the PrintUnqualified setting.
713 hsep [ ptext SLIT("Something is amiss; requested module ")
715 , ptext SLIT("differs from name found in the interface file")
719 wrongIfaceModErr iface mod_name file_path
720 = sep [ptext SLIT("Interface file") <+> iface_file,
721 ptext SLIT("contains module") <+> quotes (ppr (mi_module iface)) <> comma,
722 ptext SLIT("but we were expecting module") <+> quotes (ppr mod_name),
723 sep [ptext SLIT("Probable cause: the source code which generated"),
725 ptext SLIT("has an incompatible module name")
728 where iface_file = doubleQuotes (text file_path)
730 homeModError mod location
731 = ptext SLIT("attempting to use module ") <> quotes (ppr mod)
732 <> (case ml_hs_file location of
733 Just file -> space <> parens (text file)
735 <+> ptext SLIT("which is not loaded")