2 % (c) The University of Glasgow 2006
3 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
5 \section[TcModule]{Typechecking a whole module}
9 -- The above warning supression flag is a temporary kludge.
10 -- While working on this module you are encouraged to remove it and fix
11 -- any warnings in the module. See
12 -- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
17 tcRnStmt, tcRnExpr, tcRnType,
28 #include "HsVersions.h"
32 import {-# SOURCE #-} TcSplice ( tcSpliceDecls )
95 import {- Kind parts of -} Type
97 import Foreign.Ptr( Ptr )
105 import Control.Monad ( unless )
106 import Data.Maybe ( isJust )
112 %************************************************************************
114 Typecheck and rename a module
116 %************************************************************************
122 -> Bool -- True <=> save renamed syntax
123 -> Located (HsModule RdrName)
124 -> IO (Messages, Maybe TcGblEnv)
126 tcRnModule hsc_env hsc_src save_rn_syntax
127 (L loc (HsModule maybe_mod export_ies
128 import_decls local_decls mod_deprec _
129 module_info maybe_doc))
130 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
132 let { this_pkg = thisPackage (hsc_dflags hsc_env) ;
133 this_mod = case maybe_mod of
134 Nothing -> mAIN -- 'module M where' is omitted
135 Just (L _ mod) -> mkModule this_pkg mod } ;
138 initTc hsc_env hsc_src save_rn_syntax this_mod $
140 do { -- Deal with imports;
141 tcg_env <- tcRnImports hsc_env this_mod import_decls ;
142 setGblEnv tcg_env $ do {
144 -- Load the hi-boot interface for this module, if any
145 -- We do this now so that the boot_names can be passed
146 -- to tcTyAndClassDecls, because the boot_names are
147 -- automatically considered to be loop breakers
149 -- Do this *after* tcRnImports, so that we know whether
150 -- a module that we import imports us; and hence whether to
151 -- look for a hi-boot file
152 boot_iface <- tcHiBootIface hsc_src this_mod ;
154 -- Rename and type check the declarations
155 traceRn (text "rn1a") ;
156 tcg_env <- if isHsBoot hsc_src then
157 tcRnHsBootDecls local_decls
159 tcRnSrcDecls boot_iface local_decls ;
160 setGblEnv tcg_env $ do {
162 -- Report the use of any deprecated things
163 -- We do this *before* processsing the export list so
164 -- that we don't bleat about re-exporting a deprecated
165 -- thing (especially via 'module Foo' export item)
166 -- That is, only uses in the *body* of the module are complained about
167 traceRn (text "rn3") ;
168 failIfErrsM ; -- finishDeprecations crashes sometimes
169 -- as a result of typechecker repairs (e.g. unboundNames)
170 tcg_env <- finishDeprecations (hsc_dflags hsc_env) mod_deprec tcg_env ;
172 -- Process the export list
173 traceRn (text "rn4a: before exports");
174 tcg_env <- rnExports (isJust maybe_mod) export_ies tcg_env ;
175 traceRn (text "rn4b: after exportss") ;
177 -- Compare the hi-boot iface (if any) with the real thing
178 -- Must be done after processing the exports
179 tcg_env <- checkHiBootIface tcg_env boot_iface ;
181 -- Make the new type env available to stuff slurped from interface files
182 -- Must do this after checkHiBootIface, because the latter might add new
183 -- bindings for boot_dfuns, which may be mentioned in imported unfoldings
184 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
186 -- Rename the Haddock documentation
187 tcg_env <- rnHaddock module_info maybe_doc tcg_env ;
189 -- Report unused names
190 reportUnusedNames export_ies tcg_env ;
192 -- Dump output and return
199 %************************************************************************
203 %************************************************************************
206 tcRnImports :: HscEnv -> Module -> [LImportDecl RdrName] -> TcM TcGblEnv
207 tcRnImports hsc_env this_mod import_decls
208 = do { (rn_imports, rdr_env, imports,hpc_info) <- rnImports import_decls ;
210 ; let { dep_mods :: ModuleNameEnv (ModuleName, IsBootInterface)
211 ; dep_mods = imp_dep_mods imports
213 -- We want instance declarations from all home-package
214 -- modules below this one, including boot modules, except
215 -- ourselves. The 'except ourselves' is so that we don't
216 -- get the instances from this module's hs-boot file
217 ; want_instances :: ModuleName -> Bool
218 ; want_instances mod = mod `elemUFM` dep_mods
219 && mod /= moduleName this_mod
220 ; (home_insts, home_fam_insts) = hptInstances hsc_env
224 -- Record boot-file info in the EPS, so that it's
225 -- visible to loadHiBootInterface in tcRnSrcDecls,
226 -- and any other incrementally-performed imports
227 ; updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
229 -- Update the gbl env
230 ; updGblEnv ( \ gbl ->
232 tcg_rdr_env = plusOccEnv (tcg_rdr_env gbl) rdr_env,
233 tcg_imports = tcg_imports gbl `plusImportAvails` imports,
234 tcg_rn_imports = fmap (const rn_imports) (tcg_rn_imports gbl),
235 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts,
236 tcg_fam_inst_env = extendFamInstEnvList (tcg_fam_inst_env gbl)
241 ; traceRn (text "rn1" <+> ppr (imp_dep_mods imports))
242 -- Fail if there are any errors so far
243 -- The error printing (if needed) takes advantage
244 -- of the tcg_env we have now set
245 -- ; traceIf (text "rdr_env: " <+> ppr rdr_env)
248 -- Load any orphan-module and family instance-module
249 -- interfaces, so that their rules and instance decls will be
251 ; loadOrphanModules (imp_orphs imports) False
252 ; loadOrphanModules (imp_finsts imports) True
254 -- Check type-familily consistency
255 ; traceRn (text "rn1: checking family instance consistency")
256 ; let { dir_imp_mods = map (\ (mod, _) -> mod)
260 ; checkFamInstConsistency (imp_finsts imports) dir_imp_mods ;
266 %************************************************************************
268 Type-checking external-core modules
270 %************************************************************************
273 tcRnExtCore :: HscEnv
275 -> IO (Messages, Maybe ModGuts)
276 -- Nothing => some error occurred
278 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
279 -- The decls are IfaceDecls; all names are original names
280 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
282 initTc hsc_env ExtCoreFile False this_mod $ do {
284 let { ldecls = map noLoc decls } ;
286 -- bring the type and class decls into scope
287 -- ToDo: check that this doesn't need to extract the val binds.
288 -- It seems that only the type and class decls need to be in scope below because
289 -- (a) tcTyAndClassDecls doesn't need the val binds, and
290 -- (b) tcExtCoreBindings doesn't need anything
291 -- (in fact, it might not even need to be in the scope of
292 -- this tcg_env at all)
293 tcg_env <- importsFromLocalDecls False (mkFakeGroup ldecls)
294 emptyUFM {- no fixity decls -} ;
296 setGblEnv tcg_env $ do {
298 rn_decls <- rnTyClDecls ldecls ;
301 -- Dump trace of renaming part
302 rnDump (ppr rn_decls) ;
304 -- Typecheck them all together so that
305 -- any mutually recursive types are done right
306 tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails rn_decls) ;
307 -- Make the new type env available to stuff slurped from interface files
309 setGblEnv tcg_env $ do {
311 -- Now the core bindings
312 core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
316 bndrs = bindersOfBinds core_binds ;
317 my_exports = map (Avail . idName) bndrs ;
318 -- ToDo: export the data types also?
320 final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
322 mod_guts = ModGuts { mg_module = this_mod,
324 mg_usages = [], -- ToDo: compute usage
325 mg_dir_imps = [], -- ??
326 mg_deps = noDependencies, -- ??
327 mg_exports = my_exports,
328 mg_types = final_type_env,
329 mg_insts = tcg_insts tcg_env,
330 mg_fam_insts = tcg_fam_insts tcg_env,
331 mg_inst_env = tcg_inst_env tcg_env,
332 mg_fam_inst_env = tcg_fam_inst_env tcg_env,
334 mg_binds = core_binds,
337 mg_rdr_env = emptyGlobalRdrEnv,
338 mg_fix_env = emptyFixityEnv,
339 mg_deprecs = NoDeprecs,
340 mg_foreign = NoStubs,
341 mg_hpc_info = emptyHpcInfo False,
342 mg_modBreaks = emptyModBreaks,
343 mg_vect_info = noVectInfo
346 tcCoreDump mod_guts ;
351 mkFakeGroup decls -- Rather clumsy; lots of unused fields
352 = emptyRdrGroup { hs_tyclds = decls }
356 %************************************************************************
358 Type-checking the top level of a module
360 %************************************************************************
363 tcRnSrcDecls :: ModDetails -> [LHsDecl RdrName] -> TcM TcGblEnv
364 -- Returns the variables free in the decls
365 -- Reason: solely to report unused imports and bindings
366 tcRnSrcDecls boot_iface decls
367 = do { -- Do all the declarations
368 (tc_envs, lie) <- getLIE $ tc_rn_src_decls boot_iface decls ;
370 -- Finish simplifying class constraints
372 -- tcSimplifyTop deals with constant or ambiguous InstIds.
373 -- How could there be ambiguous ones? They can only arise if a
374 -- top-level decl falls under the monomorphism restriction
375 -- and no subsequent decl instantiates its type.
377 -- We do this after checkMain, so that we use the type info
378 -- thaat checkMain adds
380 -- We do it with both global and local env in scope:
381 -- * the global env exposes the instances to tcSimplifyTop
382 -- * the local env exposes the local Ids to tcSimplifyTop,
383 -- so that we get better error messages (monomorphism restriction)
384 traceTc (text "Tc8") ;
385 inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
387 -- Backsubstitution. This must be done last.
388 -- Even tcSimplifyTop may do some unification.
389 traceTc (text "Tc9") ;
390 let { (tcg_env, _) = tc_envs
391 ; TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
392 tcg_rules = rules, tcg_fords = fords } = tcg_env
393 ; all_binds = binds `unionBags` inst_binds } ;
395 (bind_ids, binds', fords', rules') <- zonkTopDecls all_binds rules fords ;
397 let { final_type_env = extendTypeEnvWithIds type_env bind_ids
398 ; tcg_env' = tcg_env { tcg_type_env = final_type_env,
401 tcg_fords = fords' } } ;
403 return (tcg_env' { tcg_binds = tcg_binds tcg_env' })
406 tc_rn_src_decls :: ModDetails -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
407 -- Loops around dealing with each top level inter-splice group
408 -- in turn, until it's dealt with the entire module
409 tc_rn_src_decls boot_details ds
410 = do { let { (first_group, group_tail) = findSplice ds } ;
411 -- If ds is [] we get ([], Nothing)
413 -- Deal with decls up to, but not including, the first splice
414 (tcg_env, rn_decls) <- checkNoErrs $ rnTopSrcDecls first_group ;
415 -- checkNoErrs: stop if renaming fails
417 (tcg_env, tcl_env) <- setGblEnv tcg_env $
418 tcTopSrcDecls boot_details rn_decls ;
420 -- If there is no splice, we're nearly done
421 setEnvs (tcg_env, tcl_env) $
423 Nothing -> do { tcg_env <- checkMain ; -- Check for `main'
424 return (tcg_env, tcl_env)
427 -- If there's a splice, we must carry on
428 Just (SpliceDecl splice_expr, rest_ds) -> do {
430 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
433 -- Rename the splice expression, and get its supporting decls
434 (rn_splice_expr, splice_fvs) <- checkNoErrs (rnLExpr splice_expr) ;
435 -- checkNoErrs: don't typecheck if renaming failed
436 rnDump (ppr rn_splice_expr) ;
438 -- Execute the splice
439 spliced_decls <- tcSpliceDecls rn_splice_expr ;
441 -- Glue them on the front of the remaining decls and loop
442 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
443 tc_rn_src_decls boot_details (spliced_decls ++ rest_ds)
448 %************************************************************************
450 Compiling hs-boot source files, and
451 comparing the hi-boot interface with the real thing
453 %************************************************************************
456 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
457 tcRnHsBootDecls decls
458 = do { let { (first_group, group_tail) = findSplice decls }
461 Just stuff -> spliceInHsBootErr stuff
464 -- Rename the declarations
465 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
466 ; setGblEnv tcg_env $ do {
468 -- Todo: check no foreign decls, no rules, no default decls
470 -- Typecheck type/class decls
471 ; traceTc (text "Tc2")
472 ; let tycl_decls = hs_tyclds rn_group
473 ; tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails tycl_decls)
474 ; setGblEnv tcg_env $ do {
476 -- Typecheck instance decls
477 ; traceTc (text "Tc3")
478 ; (tcg_env, inst_infos, _deriv_binds)
479 <- tcInstDecls1 tycl_decls (hs_instds rn_group) (hs_derivds rn_group)
480 ; setGblEnv tcg_env $ do {
482 -- Typecheck value declarations
483 ; traceTc (text "Tc5")
484 ; val_ids <- tcHsBootSigs (hs_valds rn_group)
487 -- No simplification or zonking to do
488 ; traceTc (text "Tc7a")
489 ; gbl_env <- getGblEnv
491 -- Make the final type-env
492 -- Include the dfun_ids so that their type sigs
493 -- are written into the interface file
494 ; let { type_env0 = tcg_type_env gbl_env
495 ; type_env1 = extendTypeEnvWithIds type_env0 val_ids
496 ; type_env2 = extendTypeEnvWithIds type_env1 dfun_ids
497 ; dfun_ids = map iDFunId inst_infos }
498 ; return (gbl_env { tcg_type_env = type_env2 })
501 spliceInHsBootErr (SpliceDecl (L loc _), _)
502 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
505 Once we've typechecked the body of the module, we want to compare what
506 we've found (gathered in a TypeEnv) with the hi-boot details (if any).
509 checkHiBootIface :: TcGblEnv -> ModDetails -> TcM TcGblEnv
510 -- Compare the hi-boot file for this module (if there is one)
511 -- with the type environment we've just come up with
512 -- In the common case where there is no hi-boot file, the list
513 -- of boot_names is empty.
515 -- The bindings we return give bindings for the dfuns defined in the
516 -- hs-boot file, such as $fbEqT = $fEqT
519 tcg_env@(TcGblEnv { tcg_src = hs_src, tcg_binds = binds,
520 tcg_insts = local_insts, tcg_fam_insts = local_fam_insts,
521 tcg_type_env = local_type_env, tcg_exports = local_exports })
522 (ModDetails { md_insts = boot_insts, md_fam_insts = boot_fam_insts,
523 md_types = boot_type_env, md_exports = boot_exports })
524 | isHsBoot hs_src -- Current module is already a hs-boot file!
528 = do { traceTc (text "checkHiBootIface" <+> (ppr boot_type_env $$ ppr boot_insts $$
531 -- Check the exports of the boot module, one by one
532 ; mapM_ check_export boot_exports
534 -- Check instance declarations
535 ; mb_dfun_prs <- mapM check_inst boot_insts
536 ; let tcg_env' = tcg_env { tcg_binds = binds `unionBags` dfun_binds,
537 tcg_type_env = extendTypeEnvWithIds local_type_env boot_dfuns }
538 dfun_prs = catMaybes mb_dfun_prs
539 boot_dfuns = map fst dfun_prs
540 dfun_binds = listToBag [ noLoc $ VarBind boot_dfun (nlHsVar dfun)
541 | (boot_dfun, dfun) <- dfun_prs ]
543 -- Check for no family instances
544 ; unless (null boot_fam_insts) $
545 panic ("TcRnDriver.checkHiBootIface: Cannot handle family " ++
546 "instances in boot files yet...")
547 -- FIXME: Why? The actual comparison is not hard, but what would
548 -- be the equivalent to the dfun bindings returned for class
549 -- instances? We can't easily equate tycons...
553 check_export boot_avail -- boot_avail is exported by the boot iface
554 | name `elem` dfun_names = return ()
555 | isWiredInName name = return () -- No checking for wired-in names. In particular,
556 -- 'error' is handled by a rather gross hack
557 -- (see comments in GHC.Err.hs-boot)
559 -- Check that the actual module exports the same thing
560 | not (null missing_names)
561 = addErrTc (missingBootThing (head missing_names) "exported by")
563 -- If the boot module does not *define* the thing, we are done
564 -- (it simply re-exports it, and names match, so nothing further to do)
565 | isNothing mb_boot_thing = return ()
567 -- Check that the actual module also defines the thing, and
568 -- then compare the definitions
569 | Just real_thing <- lookupTypeEnv local_type_env name
570 = do { let boot_decl = tyThingToIfaceDecl (fromJust mb_boot_thing)
571 real_decl = tyThingToIfaceDecl real_thing
572 ; checkTc (checkBootDecl boot_decl real_decl)
573 (bootMisMatch real_thing boot_decl real_decl) }
574 -- The easiest way to check compatibility is to convert to
575 -- iface syntax, where we already have good comparison functions
578 = addErrTc (missingBootThing name "defined in")
580 name = availName boot_avail
581 mb_boot_thing = lookupTypeEnv boot_type_env name
582 missing_names = case lookupNameEnv local_export_env name of
584 Just avail -> availNames boot_avail `minusList` availNames avail
586 dfun_names = map getName boot_insts
588 local_export_env :: NameEnv AvailInfo
589 local_export_env = availsToNameEnv local_exports
591 check_inst :: Instance -> TcM (Maybe (Id, Id))
592 -- Returns a pair of the boot dfun in terms of the equivalent real dfun
594 = case [dfun | inst <- local_insts,
595 let dfun = instanceDFunId inst,
596 idType dfun `tcEqType` boot_inst_ty ] of
597 [] -> do { addErrTc (instMisMatch boot_inst); return Nothing }
598 (dfun:_) -> return (Just (local_boot_dfun, dfun))
600 boot_dfun = instanceDFunId boot_inst
601 boot_inst_ty = idType boot_dfun
602 local_boot_dfun = Id.mkExportedLocalId (idName boot_dfun) boot_inst_ty
606 missingBootThing thing what
607 = ppr thing <+> ptext SLIT("is exported by the hs-boot file, but not")
608 <+> text what <+> ptext SLIT("the module")
610 bootMisMatch thing boot_decl real_decl
611 = vcat [ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file"),
612 ptext SLIT("Main module:") <+> ppr real_decl,
613 ptext SLIT("Boot file: ") <+> ppr boot_decl]
617 2 (ptext SLIT("is defined in the hs-boot file, but not in the module itself"))
621 %************************************************************************
623 Type-checking the top level of a module
625 %************************************************************************
627 tcRnGroup takes a bunch of top-level source-code declarations, and
629 * gets supporting declarations from interface files
632 * and augments the TcGblEnv with the results
634 In Template Haskell it may be called repeatedly for each group of
635 declarations. It expects there to be an incoming TcGblEnv in the
636 monad; it augments it and returns the new TcGblEnv.
639 ------------------------------------------------
640 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
642 = do { -- Rename the source decls (with no shadowing; error on duplicates)
643 (tcg_env, rn_decls) <- rnSrcDecls False group ;
646 -- save the renamed syntax, if we want it
648 | Just grp <- tcg_rn_decls tcg_env
649 = tcg_env{ tcg_rn_decls = Just (appendGroups grp rn_decls) }
653 -- Dump trace of renaming part
654 rnDump (ppr rn_decls) ;
656 return (tcg_env', rn_decls)
659 ------------------------------------------------
660 tcTopSrcDecls :: ModDetails -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
661 tcTopSrcDecls boot_details
662 (HsGroup { hs_tyclds = tycl_decls,
663 hs_instds = inst_decls,
664 hs_derivds = deriv_decls,
665 hs_fords = foreign_decls,
666 hs_defds = default_decls,
667 hs_ruleds = rule_decls,
668 hs_valds = val_binds })
669 = do { -- Type-check the type and class decls, and all imported decls
670 -- The latter come in via tycl_decls
671 traceTc (text "Tc2") ;
673 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_details tycl_decls) ;
674 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
675 -- an error we'd better stop now, to avoid a cascade
677 -- Make these type and class decls available to stuff slurped from interface files
678 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
681 setGblEnv tcg_env $ do {
682 -- Source-language instances, including derivings,
683 -- and import the supporting declarations
684 traceTc (text "Tc3") ;
685 (tcg_env, inst_infos, deriv_binds)
686 <- tcInstDecls1 tycl_decls inst_decls deriv_decls;
687 setGblEnv tcg_env $ do {
689 -- Foreign import declarations next. No zonking necessary
690 -- here; we can tuck them straight into the global environment.
691 traceTc (text "Tc4") ;
692 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
693 tcExtendGlobalValEnv fi_ids $ do {
695 -- Default declarations
696 traceTc (text "Tc4a") ;
697 default_tys <- tcDefaults default_decls ;
698 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
700 -- Value declarations next
701 -- We also typecheck any extra binds that came out
702 -- of the "deriving" process (deriv_binds)
703 traceTc (text "Tc5") ;
704 (tc_val_binds, tcl_env) <- tcTopBinds val_binds ;
705 setLclTypeEnv tcl_env $ do {
707 -- Now GHC-generated derived bindings and generics.
708 -- Do not generate warnings from compiler-generated code.
709 (tc_deriv_binds, tcl_env) <- discardWarnings $
710 tcTopBinds deriv_binds ;
712 -- Second pass over class and instance declarations,
713 traceTc (text "Tc6") ;
714 (inst_binds, tcl_env) <- setLclTypeEnv tcl_env $ tcInstDecls2 tycl_decls inst_infos ;
715 showLIE (text "after instDecls2") ;
718 -- They need to be zonked, so we return them
719 traceTc (text "Tc7") ;
720 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
723 rules <- tcRules rule_decls ;
726 traceTc (text "Tc7a") ;
727 tcg_env <- getGblEnv ;
728 let { all_binds = tc_val_binds `unionBags`
729 tc_deriv_binds `unionBags`
730 inst_binds `unionBags`
733 -- Extend the GblEnv with the (as yet un-zonked)
734 -- bindings, rules, foreign decls
735 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
736 tcg_rules = tcg_rules tcg_env ++ rules,
737 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
738 return (tcg_env', tcl_env)
743 %************************************************************************
747 %************************************************************************
750 checkMain :: TcM TcGblEnv
751 -- If we are in module Main, check that 'main' is defined.
753 = do { tcg_env <- getGblEnv ;
755 check_main dflags tcg_env
758 check_main dflags tcg_env
760 = traceTc (text "checkMain not" <+> ppr main_mod <+> ppr mod) >>
764 = do { mb_main <- lookupSrcOcc_maybe main_fn
765 -- Check that 'main' is in scope
766 -- It might be imported from another module!
768 Nothing -> do { traceTc (text "checkMain fail" <+> ppr main_mod <+> ppr main_fn)
773 { traceTc (text "checkMain found" <+> ppr main_mod <+> ppr main_fn)
774 ; let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
775 -- :Main.main :: IO () = runMainIO main
777 ; (main_expr, ty) <- addErrCtxt mainCtxt $
778 setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
781 -- See Note [Root-main Id]
782 ; let { root_main_name = mkExternalName rootMainKey rOOT_MAIN
783 (mkVarOccFS FSLIT("main"))
784 (getSrcSpan main_name)
785 ; root_main_id = Id.mkExportedLocalId root_main_name ty
786 ; main_bind = noLoc (VarBind root_main_id main_expr) }
788 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
790 tcg_dus = tcg_dus tcg_env
791 `plusDU` usesOnly (unitFV main_name)
792 -- Record the use of 'main', so that we don't
793 -- complain about it being defined but not used
797 mod = tcg_mod tcg_env
798 main_mod = mainModIs dflags
799 main_is_flag = mainFunIs dflags
801 main_fn = case main_is_flag of
802 Just fn -> mkRdrUnqual (mkVarOccFS (mkFastString fn))
803 Nothing -> main_RDR_Unqual
805 complain_no_main | ghcLink dflags == LinkInMemory = return ()
806 | otherwise = failWithTc noMainMsg
807 -- In interactive mode, don't worry about the absence of 'main'
808 -- In other modes, fail altogether, so that we don't go on
809 -- and complain a second time when processing the export list.
811 mainCtxt = ptext SLIT("When checking the type of the") <+> pp_main_fn
812 noMainMsg = ptext SLIT("The") <+> pp_main_fn
813 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
814 pp_main_fn | isJust main_is_flag = ptext SLIT("main function") <+> quotes (ppr main_fn)
815 | otherwise = ptext SLIT("function") <+> quotes (ppr main_fn)
820 The function that the RTS invokes is always :Main.main, which we call
821 root_main_id. (Because GHC allows the user to have a module not
822 called Main as the main module, we can't rely on the main function
823 being called "Main.main". That's why root_main_id has a fixed module
826 This is unusual: it's a LocalId whose Name has a Module from another
827 module. Tiresomely, we must filter it out again in MkIface, les we
828 get two defns for 'main' in the interface file!
831 %*********************************************************
835 %*********************************************************
839 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
840 setInteractiveContext hsc_env icxt thing_inside
841 = let -- Initialise the tcg_inst_env with instances from all home modules.
842 -- This mimics the more selective call to hptInstances in tcRnModule.
843 (home_insts, home_fam_insts) = hptInstances hsc_env (\mod -> True)
845 updGblEnv (\env -> env {
846 tcg_rdr_env = ic_rn_gbl_env icxt,
847 tcg_inst_env = extendInstEnvList (tcg_inst_env env) home_insts,
848 tcg_fam_inst_env = extendFamInstEnvList (tcg_fam_inst_env env)
852 tcExtendGhciEnv (ic_tmp_ids icxt) $
853 -- tcExtendGhciEnv does lots:
854 -- - it extends the local type env (tcl_env) with the given Ids,
855 -- - it extends the local rdr env (tcl_rdr) with the Names from
857 -- - it adds the free tyvars of the Ids to the tcl_tyvars
860 -- later ids in ic_tmp_ids must shadow earlier ones with the same
861 -- OccName, and tcExtendIdEnv implements this behaviour.
863 do { traceTc (text "setIC" <+> ppr (ic_tmp_ids icxt))
870 -> InteractiveContext
872 -> IO (Maybe ([Id], LHsExpr Id))
873 -- The returned [Id] is the list of new Ids bound by
874 -- this statement. It can be used to extend the
875 -- InteractiveContext via extendInteractiveContext.
877 -- The returned TypecheckedHsExpr is of type IO [ () ],
878 -- a list of the bound values, coerced to ().
880 tcRnStmt hsc_env ictxt rdr_stmt
881 = initTcPrintErrors hsc_env iNTERACTIVE $
882 setInteractiveContext hsc_env ictxt $ do {
884 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
885 (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
886 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
888 rnDump (ppr rn_stmt) ;
890 -- The real work is done here
891 (bound_ids, tc_expr) <- mkPlan rn_stmt ;
892 zonked_expr <- zonkTopLExpr tc_expr ;
893 zonked_ids <- zonkTopBndrs bound_ids ;
895 -- None of the Ids should be of unboxed type, because we
896 -- cast them all to HValues in the end!
897 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
899 traceTc (text "tcs 1") ;
900 let { -- (a) Make all the bound ids "global" ids, now that
901 -- they're notionally top-level bindings. This is
902 -- important: otherwise when we come to compile an expression
903 -- using these ids later, the byte code generator will consider
904 -- the occurrences to be free rather than global.
906 -- (b) Tidy their types; this is important, because :info may
907 -- ask to look at them, and :info expects the things it looks
908 -- up to have tidy types
909 global_ids = map globaliseAndTidy zonked_ids ;
911 {- ---------------------------------------------
912 At one stage I removed any shadowed bindings from the type_env;
913 they are inaccessible but might, I suppose, cause a space leak if we leave them there.
914 However, with Template Haskell they aren't necessarily inaccessible. Consider this
916 Prelude> let f n = n * 2 :: Int
917 Prelude> fName <- runQ [| f |]
918 Prelude> $(return $ AppE fName (LitE (IntegerL 7)))
920 Prelude> let f n = n * 3 :: Int
921 Prelude> $(return $ AppE fName (LitE (IntegerL 7)))
922 In the last line we use 'fName', which resolves to the *first* 'f'
923 in scope. If we delete it from the type env, GHCi crashes because
924 it doesn't expect that.
926 Hence this code is commented out
928 -------------------------------------------------- -}
931 dumpOptTcRn Opt_D_dump_tc
932 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
933 text "Typechecked expr" <+> ppr zonked_expr]) ;
935 returnM (global_ids, zonked_expr)
938 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
939 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
941 globaliseAndTidy :: Id -> Id
943 -- Give the Id a Global Name, and tidy its type
944 = Id.setIdType (globaliseId VanillaGlobal id) tidy_type
946 tidy_type = tidyTopType (idType id)
949 Here is the grand plan, implemented in tcUserStmt
951 What you type The IO [HValue] that hscStmt returns
952 ------------- ------------------------------------
953 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
956 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
959 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
960 [NB: result not printed] bindings: [it]
962 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
963 result showable) bindings: [it]
965 expr (of non-IO type,
966 result not showable) ==> error
970 ---------------------------
971 type PlanResult = ([Id], LHsExpr Id)
972 type Plan = TcM PlanResult
974 runPlans :: [Plan] -> TcM PlanResult
975 -- Try the plans in order. If one fails (by raising an exn), try the next.
976 -- If one succeeds, take it.
977 runPlans [] = panic "runPlans"
979 runPlans (p:ps) = tryTcLIE_ (runPlans ps) p
982 mkPlan :: LStmt Name -> TcM PlanResult
983 mkPlan (L loc (ExprStmt expr _ _)) -- An expression typed at the prompt
984 = do { uniq <- newUnique -- is treated very specially
985 ; let fresh_it = itName uniq
986 the_bind = L loc $ mkFunBind (L loc fresh_it) matches
987 matches = [mkMatch [] expr emptyLocalBinds]
988 let_stmt = L loc $ LetStmt (HsValBinds (ValBindsOut [(NonRecursive,unitBag the_bind)] []))
989 bind_stmt = L loc $ BindStmt (nlVarPat fresh_it) expr
990 (HsVar bindIOName) noSyntaxExpr
991 print_it = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
992 (HsVar thenIOName) placeHolderType
995 -- [it <- e; print it] but not if it::()
997 -- [let it = e; print it]
998 ; runPlans [ -- Plan A
999 do { stuff@([it_id], _) <- tcGhciStmts [bind_stmt, print_it]
1000 ; it_ty <- zonkTcType (idType it_id)
1001 ; ifM (isUnitTy it_ty) failM
1004 -- Plan B; a naked bind statment
1005 tcGhciStmts [bind_stmt],
1007 -- Plan C; check that the let-binding is typeable all by itself.
1008 -- If not, fail; if so, try to print it.
1009 -- The two-step process avoids getting two errors: one from
1010 -- the expression itself, and one from the 'print it' part
1011 -- This two-step story is very clunky, alas
1012 do { checkNoErrs (tcGhciStmts [let_stmt])
1013 --- checkNoErrs defeats the error recovery of let-bindings
1014 ; tcGhciStmts [let_stmt, print_it] }
1017 mkPlan stmt@(L loc (BindStmt {}))
1018 | [L _ v] <- collectLStmtBinders stmt -- One binder, for a bind stmt
1019 = do { let print_v = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar v))
1020 (HsVar thenIOName) placeHolderType
1022 ; print_bind_result <- doptM Opt_PrintBindResult
1023 ; let print_plan = do
1024 { stuff@([v_id], _) <- tcGhciStmts [stmt, print_v]
1025 ; v_ty <- zonkTcType (idType v_id)
1026 ; ifM (isUnitTy v_ty || not (isTauTy v_ty)) failM
1030 -- [stmt; print v] but not if v::()
1032 ; runPlans ((if print_bind_result then [print_plan] else []) ++
1033 [tcGhciStmts [stmt]])
1037 = tcGhciStmts [stmt]
1039 ---------------------------
1040 tcGhciStmts :: [LStmt Name] -> TcM PlanResult
1042 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
1043 ret_id <- tcLookupId returnIOName ; -- return @ IO
1045 io_ty = mkTyConApp ioTyCon [] ;
1046 ret_ty = mkListTy unitTy ;
1047 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
1048 tc_io_stmts stmts = tcStmts DoExpr (tcDoStmt io_ty) stmts
1049 (emptyRefinement, io_ret_ty) ;
1051 names = map unLoc (collectLStmtsBinders stmts) ;
1053 -- mk_return builds the expression
1054 -- returnIO @ [()] [coerce () x, .., coerce () z]
1056 -- Despite the inconvenience of building the type applications etc,
1057 -- this *has* to be done in type-annotated post-typecheck form
1058 -- because we are going to return a list of *polymorphic* values
1059 -- coerced to type (). If we built a *source* stmt
1060 -- return [coerce x, ..., coerce z]
1061 -- then the type checker would instantiate x..z, and we wouldn't
1062 -- get their *polymorphic* values. (And we'd get ambiguity errs
1063 -- if they were overloaded, since they aren't applied to anything.)
1064 mk_return ids = nlHsApp (nlHsTyApp ret_id [ret_ty])
1065 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
1066 mk_item id = nlHsApp (nlHsTyApp unsafeCoerceId [idType id, unitTy])
1070 -- OK, we're ready to typecheck the stmts
1071 traceTc (text "TcRnDriver.tcGhciStmts: tc stmts") ;
1072 ((tc_stmts, ids), lie) <- getLIE $ tc_io_stmts stmts $ \ _ ->
1073 mappM tcLookupId names ;
1074 -- Look up the names right in the middle,
1075 -- where they will all be in scope
1077 -- Simplify the context
1078 traceTc (text "TcRnDriver.tcGhciStmts: simplify ctxt") ;
1079 const_binds <- checkNoErrs (tcSimplifyInteractive lie) ;
1080 -- checkNoErrs ensures that the plan fails if context redn fails
1082 traceTc (text "TcRnDriver.tcGhciStmts: done") ;
1083 return (ids, mkHsDictLet const_binds $
1084 noLoc (HsDo DoExpr tc_stmts (mk_return ids) io_ret_ty))
1089 tcRnExpr just finds the type of an expression
1093 -> InteractiveContext
1096 tcRnExpr hsc_env ictxt rdr_expr
1097 = initTcPrintErrors hsc_env iNTERACTIVE $
1098 setInteractiveContext hsc_env ictxt $ do {
1100 (rn_expr, fvs) <- rnLExpr rdr_expr ;
1103 -- Now typecheck the expression;
1104 -- it might have a rank-2 type (e.g. :t runST)
1105 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
1106 ((qtvs, dict_insts, _), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
1107 tcSimplifyInteractive lie_top ;
1109 let { all_expr_ty = mkForAllTys qtvs $
1110 mkFunTys (map (idType . instToId) dict_insts) $
1112 zonkTcType all_expr_ty
1115 smpl_doc = ptext SLIT("main expression")
1118 tcRnType just finds the kind of a type
1122 -> InteractiveContext
1125 tcRnType hsc_env ictxt rdr_type
1126 = initTcPrintErrors hsc_env iNTERACTIVE $
1127 setInteractiveContext hsc_env ictxt $ do {
1129 rn_type <- rnLHsType doc rdr_type ;
1132 -- Now kind-check the type
1133 (ty', kind) <- kcHsType rn_type ;
1137 doc = ptext SLIT("In GHCi input")
1143 %************************************************************************
1145 More GHCi stuff, to do with browsing and getting info
1147 %************************************************************************
1151 -- ASSUMES that the module is either in the HomePackageTable or is
1152 -- a package module with an interface on disk. If neither of these is
1153 -- true, then the result will be an error indicating the interface
1154 -- could not be found.
1155 getModuleExports :: HscEnv -> Module -> IO (Messages, Maybe [AvailInfo])
1156 getModuleExports hsc_env mod
1159 checkMods = ic_toplev_scope ic ++ ic_exports ic
1161 initTc hsc_env HsSrcFile False iNTERACTIVE (tcGetModuleExports mod checkMods)
1163 -- Get the export avail info and also load all orphan and family-instance
1164 -- modules. Finally, check that the family instances of all modules in the
1165 -- interactive context are consistent (these modules are in the second
1167 tcGetModuleExports :: Module -> [Module] -> TcM [AvailInfo]
1168 tcGetModuleExports mod directlyImpMods
1169 = do { let doc = ptext SLIT("context for compiling statements")
1170 ; iface <- initIfaceTcRn $ loadSysInterface doc mod
1172 -- Load any orphan-module and family instance-module
1173 -- interfaces, so their instances are visible.
1174 ; loadOrphanModules (dep_orphs (mi_deps iface)) False
1175 ; loadOrphanModules (dep_finsts (mi_deps iface)) True
1177 -- Check that the family instances of all directly loaded
1178 -- modules are consistent.
1179 ; checkFamInstConsistency (dep_finsts (mi_deps iface)) directlyImpMods
1181 ; ifaceExportNames (mi_exports iface)
1184 tcRnLookupRdrName :: HscEnv -> RdrName -> IO (Maybe [Name])
1185 tcRnLookupRdrName hsc_env rdr_name
1186 = initTcPrintErrors hsc_env iNTERACTIVE $
1187 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1188 lookup_rdr_name rdr_name
1190 lookup_rdr_name rdr_name = do {
1191 -- If the identifier is a constructor (begins with an
1192 -- upper-case letter), then we need to consider both
1193 -- constructor and type class identifiers.
1194 let { rdr_names = dataTcOccs rdr_name } ;
1196 -- results :: [Either Messages Name]
1197 results <- mapM (tryTcErrs . lookupOccRn) rdr_names ;
1199 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1200 -- The successful lookups will be (Just name)
1201 let { (warns_s, good_names) = unzip [ (msgs, name)
1202 | (msgs, Just name) <- results] ;
1203 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1205 -- Fail if nothing good happened, else add warnings
1206 if null good_names then
1207 -- No lookup succeeded, so
1208 -- pick the first error message and report it
1209 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1210 -- while the other is "X is not in scope",
1211 -- we definitely want the former; but we might pick the latter
1212 do { addMessages (head errs_s) ; failM }
1213 else -- Add deprecation warnings
1214 mapM_ addMessages warns_s ;
1219 tcRnLookupName :: HscEnv -> Name -> IO (Maybe TyThing)
1220 tcRnLookupName hsc_env name
1221 = initTcPrintErrors hsc_env iNTERACTIVE $
1222 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1223 tcRnLookupName' name
1225 -- To look up a name we have to look in the local environment (tcl_lcl)
1226 -- as well as the global environment, which is what tcLookup does.
1227 -- But we also want a TyThing, so we have to convert:
1229 tcRnLookupName' :: Name -> TcRn TyThing
1230 tcRnLookupName' name = do
1231 tcthing <- tcLookup name
1233 AGlobal thing -> return thing
1234 ATcId{tct_id=id} -> return (AnId id)
1235 _ -> panic "tcRnLookupName'"
1237 tcRnGetInfo :: HscEnv
1239 -> IO (Maybe (TyThing, Fixity, [Instance]))
1241 -- Used to implemnent :info in GHCi
1243 -- Look up a RdrName and return all the TyThings it might be
1244 -- A capitalised RdrName is given to us in the DataName namespace,
1245 -- but we want to treat it as *both* a data constructor
1246 -- *and* as a type or class constructor;
1247 -- hence the call to dataTcOccs, and we return up to two results
1248 tcRnGetInfo hsc_env name
1249 = initTcPrintErrors hsc_env iNTERACTIVE $
1250 let ictxt = hsc_IC hsc_env in
1251 setInteractiveContext hsc_env ictxt $ do
1253 -- Load the interface for all unqualified types and classes
1254 -- That way we will find all the instance declarations
1255 -- (Packages have not orphan modules, and we assume that
1256 -- in the home package all relevant modules are loaded.)
1257 loadUnqualIfaces ictxt
1259 thing <- tcRnLookupName' name
1260 fixity <- lookupFixityRn name
1261 ispecs <- lookupInsts thing
1262 return (thing, fixity, ispecs)
1264 lookupInsts :: TyThing -> TcM [Instance]
1265 lookupInsts (AClass cls)
1266 = do { inst_envs <- tcGetInstEnvs
1267 ; return (classInstances inst_envs cls) }
1269 lookupInsts (ATyCon tc)
1270 = do { eps <- getEps -- Load all instances for all classes that are
1271 -- in the type environment (which are all the ones
1272 -- we've seen in any interface file so far)
1273 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1275 | ispec <- instEnvElts home_ie ++ instEnvElts pkg_ie
1276 , let dfun = instanceDFunId ispec
1279 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1280 tc_name = tyConName tc
1282 lookupInsts other = return []
1284 loadUnqualIfaces :: InteractiveContext -> TcM ()
1285 -- Load the home module for everything that is in scope unqualified
1286 -- This is so that we can accurately report the instances for
1288 loadUnqualIfaces ictxt
1290 mapM_ (loadSysInterface doc) (moduleSetElts (mkModuleSet unqual_mods))
1292 unqual_mods = [ nameModule name
1293 | gre <- globalRdrEnvElts (ic_rn_gbl_env ictxt),
1294 let name = gre_name gre,
1295 not (isInternalName name),
1296 isTcOcc (nameOccName name), -- Types and classes only
1297 unQualOK gre ] -- In scope unqualified
1298 doc = ptext SLIT("Need interface for module whose export(s) are in scope unqualified")
1302 %************************************************************************
1306 %************************************************************************
1309 rnDump :: SDoc -> TcRn ()
1310 -- Dump, with a banner, if -ddump-rn
1311 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1313 tcDump :: TcGblEnv -> TcRn ()
1315 = do { dflags <- getDOpts ;
1317 -- Dump short output if -ddump-types or -ddump-tc
1318 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1319 (dumpTcRn short_dump) ;
1321 -- Dump bindings if -ddump-tc
1322 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1325 short_dump = pprTcGblEnv env
1326 full_dump = pprLHsBinds (tcg_binds env)
1327 -- NB: foreign x-d's have undefined's in their types;
1328 -- hence can't show the tc_fords
1331 = do { dflags <- getDOpts ;
1332 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1333 (dumpTcRn (pprModGuts mod_guts)) ;
1335 -- Dump bindings if -ddump-tc
1336 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1338 full_dump = pprCoreBindings (mg_binds mod_guts)
1340 -- It's unpleasant having both pprModGuts and pprModDetails here
1341 pprTcGblEnv :: TcGblEnv -> SDoc
1342 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1344 tcg_fam_insts = fam_insts,
1346 tcg_imports = imports })
1347 = vcat [ ppr_types insts type_env
1348 , ppr_tycons fam_insts type_env
1350 , ppr_fam_insts fam_insts
1351 , vcat (map ppr rules)
1352 , ppr_gen_tycons (typeEnvTyCons type_env)
1353 , ptext SLIT("Dependent modules:") <+> ppr (eltsUFM (imp_dep_mods imports))
1354 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1356 pprModGuts :: ModGuts -> SDoc
1357 pprModGuts (ModGuts { mg_types = type_env,
1359 = vcat [ ppr_types [] type_env,
1362 ppr_types :: [Instance] -> TypeEnv -> SDoc
1363 ppr_types insts type_env
1364 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1366 dfun_ids = map instanceDFunId insts
1367 ids = [id | id <- typeEnvIds type_env, want_sig id]
1368 want_sig id | opt_PprStyle_Debug = True
1369 | otherwise = isLocalId id &&
1370 isExternalName (idName id) &&
1371 not (id `elem` dfun_ids)
1372 -- isLocalId ignores data constructors, records selectors etc.
1373 -- The isExternalName ignores local dictionary and method bindings
1374 -- that the type checker has invented. Top-level user-defined things
1375 -- have External names.
1377 ppr_tycons :: [FamInst] -> TypeEnv -> SDoc
1378 ppr_tycons fam_insts type_env
1379 = text "TYPE CONSTRUCTORS" $$ nest 4 (ppr_tydecls tycons)
1381 fi_tycons = map famInstTyCon fam_insts
1382 tycons = [tycon | tycon <- typeEnvTyCons type_env, want_tycon tycon]
1383 want_tycon tycon | opt_PprStyle_Debug = True
1384 | otherwise = not (isImplicitTyCon tycon) &&
1385 isExternalName (tyConName tycon) &&
1386 not (tycon `elem` fi_tycons)
1388 ppr_insts :: [Instance] -> SDoc
1389 ppr_insts [] = empty
1390 ppr_insts ispecs = text "INSTANCES" $$ nest 2 (pprInstances ispecs)
1392 ppr_fam_insts :: [FamInst] -> SDoc
1393 ppr_fam_insts [] = empty
1394 ppr_fam_insts fam_insts =
1395 text "FAMILY INSTANCES" $$ nest 2 (pprFamInsts fam_insts)
1397 ppr_sigs :: [Var] -> SDoc
1399 -- Print type signatures; sort by OccName
1400 = vcat (map ppr_sig (sortLe le_sig ids))
1402 le_sig id1 id2 = getOccName id1 <= getOccName id2
1403 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1405 ppr_tydecls :: [TyCon] -> SDoc
1407 -- Print type constructor info; sort by OccName
1408 = vcat (map ppr_tycon (sortLe le_sig tycons))
1410 le_sig tycon1 tycon2 = getOccName tycon1 <= getOccName tycon2
1412 | isCoercionTyCon tycon = ptext SLIT("coercion") <+> ppr tycon
1413 | otherwise = ppr (tyThingToIfaceDecl (ATyCon tycon))
1415 ppr_rules :: [CoreRule] -> SDoc
1416 ppr_rules [] = empty
1417 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1418 nest 4 (pprRules rs),
1421 ppr_gen_tycons [] = empty
1422 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1423 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]