2 % (c) The University of Glasgow 2006
3 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
5 \section[TcModule]{Typechecking a whole module}
10 tcRnStmt, tcRnExpr, tcRnType,
22 #include "HsVersions.h"
26 import {-# SOURCE #-} TcSplice ( tcSpliceDecls )
89 import {- Kind parts of -} Type
98 import Control.Monad ( unless )
99 import Data.Maybe ( isJust )
100 import Foreign.Ptr ( Ptr )
106 %************************************************************************
108 Typecheck and rename a module
110 %************************************************************************
116 -> Bool -- True <=> save renamed syntax
117 -> Located (HsModule RdrName)
118 -> IO (Messages, Maybe TcGblEnv)
120 tcRnModule hsc_env hsc_src save_rn_syntax
121 (L loc (HsModule maybe_mod export_ies
122 import_decls local_decls mod_deprec _
123 module_info maybe_doc))
124 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
126 let { this_pkg = thisPackage (hsc_dflags hsc_env) ;
127 this_mod = case maybe_mod of
128 Nothing -> mAIN -- 'module M where' is omitted
129 Just (L _ mod) -> mkModule this_pkg mod } ;
132 initTc hsc_env hsc_src save_rn_syntax this_mod $
134 do { -- Deal with imports;
135 tcg_env <- tcRnImports hsc_env this_mod import_decls ;
136 setGblEnv tcg_env $ do {
138 -- Load the hi-boot interface for this module, if any
139 -- We do this now so that the boot_names can be passed
140 -- to tcTyAndClassDecls, because the boot_names are
141 -- automatically considered to be loop breakers
143 -- Do this *after* tcRnImports, so that we know whether
144 -- a module that we import imports us; and hence whether to
145 -- look for a hi-boot file
146 boot_iface <- tcHiBootIface hsc_src this_mod ;
148 -- Rename and type check the declarations
149 traceRn (text "rn1a") ;
150 tcg_env <- if isHsBoot hsc_src then
151 tcRnHsBootDecls local_decls
153 tcRnSrcDecls boot_iface local_decls ;
154 setGblEnv tcg_env $ do {
156 -- Report the use of any deprecated things
157 -- We do this *before* processsing the export list so
158 -- that we don't bleat about re-exporting a deprecated
159 -- thing (especially via 'module Foo' export item)
160 -- That is, only uses in the *body* of the module are complained about
161 traceRn (text "rn3") ;
162 failIfErrsM ; -- finishDeprecations crashes sometimes
163 -- as a result of typechecker repairs (e.g. unboundNames)
164 tcg_env <- finishDeprecations (hsc_dflags hsc_env) mod_deprec tcg_env ;
166 -- Process the export list
167 tcg_env <- rnExports (isJust maybe_mod) export_ies tcg_env ;
168 traceRn (text "rn4") ;
170 -- Compare the hi-boot iface (if any) with the real thing
171 -- Must be done after processing the exports
172 tcg_env <- checkHiBootIface tcg_env boot_iface ;
174 -- Make the new type env available to stuff slurped from interface files
175 -- Must do this after checkHiBootIface, because the latter might add new
176 -- bindings for boot_dfuns, which may be mentioned in imported unfoldings
177 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
179 -- Rename the Haddock documentation
180 tcg_env <- rnHaddock module_info maybe_doc tcg_env ;
182 -- Report unused names
183 reportUnusedNames export_ies tcg_env ;
185 -- Dump output and return
192 %************************************************************************
196 %************************************************************************
199 tcRnImports :: HscEnv -> Module -> [LImportDecl RdrName] -> TcM TcGblEnv
200 tcRnImports hsc_env this_mod import_decls
201 = do { (rn_imports, rdr_env, imports) <- rnImports import_decls ;
203 ; let { dep_mods :: ModuleNameEnv (ModuleName, IsBootInterface)
204 ; dep_mods = imp_dep_mods imports
206 -- We want instance declarations from all home-package
207 -- modules below this one, including boot modules, except
208 -- ourselves. The 'except ourselves' is so that we don't
209 -- get the instances from this module's hs-boot file
210 ; want_instances :: ModuleName -> Bool
211 ; want_instances mod = mod `elemUFM` dep_mods
212 && mod /= moduleName this_mod
213 ; home_insts = hptInstances hsc_env want_instances
216 -- Record boot-file info in the EPS, so that it's
217 -- visible to loadHiBootInterface in tcRnSrcDecls,
218 -- and any other incrementally-performed imports
219 ; updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
221 -- Update the gbl env
222 ; updGblEnv ( \ gbl ->
223 gbl { tcg_rdr_env = plusOccEnv (tcg_rdr_env gbl) rdr_env,
224 tcg_imports = tcg_imports gbl `plusImportAvails` imports,
225 tcg_rn_imports = fmap (const rn_imports) (tcg_rn_imports gbl),
226 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts
229 ; traceRn (text "rn1" <+> ppr (imp_dep_mods imports))
230 -- Fail if there are any errors so far
231 -- The error printing (if needed) takes advantage
232 -- of the tcg_env we have now set
233 -- ; traceIf (text "rdr_env: " <+> ppr rdr_env)
236 -- Load any orphan-module and family instance-module
237 -- interfaces, so that their rules and instance decls will be
239 ; loadOrphanModules (imp_orphs imports) False
240 ; loadOrphanModules (imp_finsts imports) True
242 -- Check type-familily consistency
243 ; traceRn (text "rn1: checking family instance consistency")
244 ; let { dir_imp_mods = map (\ (mod, _, _) -> mod)
248 ; checkFamInstConsistency (imp_finsts imports) dir_imp_mods ;
254 %************************************************************************
256 Type-checking external-core modules
258 %************************************************************************
261 tcRnExtCore :: HscEnv
263 -> IO (Messages, Maybe ModGuts)
264 -- Nothing => some error occurred
266 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
267 -- The decls are IfaceDecls; all names are original names
268 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
270 initTc hsc_env ExtCoreFile False this_mod $ do {
272 let { ldecls = map noLoc decls } ;
274 -- Deal with the type declarations; first bring their stuff
275 -- into scope, then rname them, then type check them
276 tcg_env <- importsFromLocalDecls (mkFakeGroup ldecls) ;
278 setGblEnv tcg_env $ do {
280 rn_decls <- rnTyClDecls ldecls ;
283 -- Dump trace of renaming part
284 rnDump (ppr rn_decls) ;
286 -- Typecheck them all together so that
287 -- any mutually recursive types are done right
288 tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails rn_decls) ;
289 -- Make the new type env available to stuff slurped from interface files
291 setGblEnv tcg_env $ do {
293 -- Now the core bindings
294 core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
298 bndrs = bindersOfBinds core_binds ;
299 my_exports = map (Avail . idName) bndrs ;
300 -- ToDo: export the data types also?
302 final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
304 mod_guts = ModGuts { mg_module = this_mod,
306 mg_usages = [], -- ToDo: compute usage
307 mg_dir_imps = [], -- ??
308 mg_deps = noDependencies, -- ??
309 mg_exports = my_exports,
310 mg_types = final_type_env,
311 mg_insts = tcg_insts tcg_env,
312 mg_fam_insts = tcg_fam_insts tcg_env,
313 mg_fam_inst_env = tcg_fam_inst_env tcg_env,
315 mg_binds = core_binds,
318 mg_rdr_env = emptyGlobalRdrEnv,
319 mg_fix_env = emptyFixityEnv,
320 mg_deprecs = NoDeprecs,
321 mg_foreign = NoStubs,
322 mg_hpc_info = noHpcInfo,
323 mg_modBreaks = emptyModBreaks
326 tcCoreDump mod_guts ;
331 mkFakeGroup decls -- Rather clumsy; lots of unused fields
332 = emptyRdrGroup { hs_tyclds = decls }
336 %************************************************************************
338 Type-checking the top level of a module
340 %************************************************************************
343 tcRnSrcDecls :: ModDetails -> [LHsDecl RdrName] -> TcM TcGblEnv
344 -- Returns the variables free in the decls
345 -- Reason: solely to report unused imports and bindings
346 tcRnSrcDecls boot_iface decls
347 = do { -- Do all the declarations
348 (tc_envs, lie) <- getLIE $ tc_rn_src_decls boot_iface decls ;
350 -- Finish simplifying class constraints
352 -- tcSimplifyTop deals with constant or ambiguous InstIds.
353 -- How could there be ambiguous ones? They can only arise if a
354 -- top-level decl falls under the monomorphism restriction
355 -- and no subsequent decl instantiates its type.
357 -- We do this after checkMain, so that we use the type info
358 -- thaat checkMain adds
360 -- We do it with both global and local env in scope:
361 -- * the global env exposes the instances to tcSimplifyTop
362 -- * the local env exposes the local Ids to tcSimplifyTop,
363 -- so that we get better error messages (monomorphism restriction)
364 traceTc (text "Tc8") ;
365 inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
367 -- Backsubstitution. This must be done last.
368 -- Even tcSimplifyTop may do some unification.
369 traceTc (text "Tc9") ;
370 let { (tcg_env, _) = tc_envs
371 ; TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
372 tcg_rules = rules, tcg_fords = fords } = tcg_env
373 ; all_binds = binds `unionBags` inst_binds } ;
375 (bind_ids, binds', fords', rules') <- zonkTopDecls all_binds rules fords ;
377 let { final_type_env = extendTypeEnvWithIds type_env bind_ids
378 ; tcg_env' = tcg_env { tcg_type_env = final_type_env,
381 tcg_fords = fords' } } ;
383 return (tcg_env' { tcg_binds = tcg_binds tcg_env' })
386 tc_rn_src_decls :: ModDetails -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
387 -- Loops around dealing with each top level inter-splice group
388 -- in turn, until it's dealt with the entire module
389 tc_rn_src_decls boot_details ds
390 = do { let { (first_group, group_tail) = findSplice ds } ;
391 -- If ds is [] we get ([], Nothing)
393 -- Deal with decls up to, but not including, the first splice
394 (tcg_env, rn_decls) <- checkNoErrs $ rnTopSrcDecls first_group ;
395 -- checkNoErrs: stop if renaming fails
397 (tcg_env, tcl_env) <- setGblEnv tcg_env $
398 tcTopSrcDecls boot_details rn_decls ;
400 -- If there is no splice, we're nearly done
401 setEnvs (tcg_env, tcl_env) $
403 Nothing -> do { tcg_env <- checkMain ; -- Check for `main'
404 return (tcg_env, tcl_env)
407 -- If there's a splice, we must carry on
408 Just (SpliceDecl splice_expr, rest_ds) -> do {
410 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
413 -- Rename the splice expression, and get its supporting decls
414 (rn_splice_expr, splice_fvs) <- checkNoErrs (rnLExpr splice_expr) ;
415 -- checkNoErrs: don't typecheck if renaming failed
416 rnDump (ppr rn_splice_expr) ;
418 -- Execute the splice
419 spliced_decls <- tcSpliceDecls rn_splice_expr ;
421 -- Glue them on the front of the remaining decls and loop
422 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
423 tc_rn_src_decls boot_details (spliced_decls ++ rest_ds)
428 %************************************************************************
430 Compiling hs-boot source files, and
431 comparing the hi-boot interface with the real thing
433 %************************************************************************
436 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
437 tcRnHsBootDecls decls
438 = do { let { (first_group, group_tail) = findSplice decls }
441 Just stuff -> spliceInHsBootErr stuff
444 -- Rename the declarations
445 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
446 ; setGblEnv tcg_env $ do {
448 -- Todo: check no foreign decls, no rules, no default decls
450 -- Typecheck type/class decls
451 ; traceTc (text "Tc2")
452 ; let tycl_decls = hs_tyclds rn_group
453 ; tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails tycl_decls)
454 ; setGblEnv tcg_env $ do {
456 -- Typecheck instance decls
457 ; traceTc (text "Tc3")
458 ; (tcg_env, inst_infos, _deriv_binds)
459 <- tcInstDecls1 tycl_decls (hs_instds rn_group) (hs_derivds rn_group)
460 ; setGblEnv tcg_env $ do {
462 -- Typecheck value declarations
463 ; traceTc (text "Tc5")
464 ; val_ids <- tcHsBootSigs (hs_valds rn_group)
467 -- No simplification or zonking to do
468 ; traceTc (text "Tc7a")
469 ; gbl_env <- getGblEnv
471 -- Make the final type-env
472 -- Include the dfun_ids so that their type sigs
473 -- are written into the interface file
474 ; let { type_env0 = tcg_type_env gbl_env
475 ; type_env1 = extendTypeEnvWithIds type_env0 val_ids
476 ; type_env2 = extendTypeEnvWithIds type_env1 dfun_ids
477 ; dfun_ids = map iDFunId inst_infos }
478 ; return (gbl_env { tcg_type_env = type_env2 })
481 spliceInHsBootErr (SpliceDecl (L loc _), _)
482 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
485 Once we've typechecked the body of the module, we want to compare what
486 we've found (gathered in a TypeEnv) with the hi-boot details (if any).
489 checkHiBootIface :: TcGblEnv -> ModDetails -> TcM TcGblEnv
490 -- Compare the hi-boot file for this module (if there is one)
491 -- with the type environment we've just come up with
492 -- In the common case where there is no hi-boot file, the list
493 -- of boot_names is empty.
495 -- The bindings we return give bindings for the dfuns defined in the
496 -- hs-boot file, such as $fbEqT = $fEqT
499 tcg_env@(TcGblEnv { tcg_src = hs_src, tcg_binds = binds,
500 tcg_insts = local_insts, tcg_fam_insts = local_fam_insts,
501 tcg_type_env = local_type_env, tcg_exports = local_exports })
502 (ModDetails { md_insts = boot_insts, md_fam_insts = boot_fam_insts,
503 md_types = boot_type_env, md_exports = boot_exports })
504 | isHsBoot hs_src -- Current module is already a hs-boot file!
508 = do { traceTc (text "checkHiBootIface" <+> (ppr boot_type_env $$ ppr boot_insts $$
511 -- Check the exports of the boot module, one by one
512 ; mapM_ check_export boot_exports
514 -- Check instance declarations
515 ; mb_dfun_prs <- mapM check_inst boot_insts
516 ; let tcg_env' = tcg_env { tcg_binds = binds `unionBags` dfun_binds,
517 tcg_type_env = extendTypeEnvWithIds local_type_env boot_dfuns }
518 dfun_prs = catMaybes mb_dfun_prs
519 boot_dfuns = map fst dfun_prs
520 dfun_binds = listToBag [ noLoc $ VarBind boot_dfun (nlHsVar dfun)
521 | (boot_dfun, dfun) <- dfun_prs ]
523 -- Check for no family instances
524 ; unless (null boot_fam_insts) $
525 panic ("TcRnDriver.checkHiBootIface: Cannot handle family " ++
526 "instances in boot files yet...")
527 -- FIXME: Why? The actual comparison is not hard, but what would
528 -- be the equivalent to the dfun bindings returned for class
529 -- instances? We can't easily equate tycons...
533 check_export boot_avail -- boot_avail is exported by the boot iface
534 | name `elem` dfun_names = return ()
535 | isWiredInName name = return () -- No checking for wired-in names. In particular,
536 -- 'error' is handled by a rather gross hack
537 -- (see comments in GHC.Err.hs-boot)
539 -- Check that the actual module exports the same thing
540 | not (null missing_names)
541 = addErrTc (missingBootThing (head missing_names) "exported by")
543 -- If the boot module does not *define* the thing, we are done
544 -- (it simply re-exports it, and names match, so nothing further to do)
545 | isNothing mb_boot_thing = return ()
547 -- Check that the actual module also defines the thing, and
548 -- then compare the definitions
549 | Just real_thing <- lookupTypeEnv local_type_env name
550 = do { let boot_decl = tyThingToIfaceDecl (fromJust mb_boot_thing)
551 real_decl = tyThingToIfaceDecl real_thing
552 ; checkTc (checkBootDecl boot_decl real_decl)
553 (bootMisMatch real_thing boot_decl real_decl) }
554 -- The easiest way to check compatibility is to convert to
555 -- iface syntax, where we already have good comparison functions
558 = addErrTc (missingBootThing name "defined in")
560 name = availName boot_avail
561 mb_boot_thing = lookupTypeEnv boot_type_env name
562 missing_names = case lookupNameEnv local_export_env name of
564 Just avail -> availNames boot_avail `minusList` availNames avail
566 dfun_names = map getName boot_insts
568 local_export_env :: NameEnv AvailInfo
569 local_export_env = availsToNameEnv local_exports
571 check_inst :: Instance -> TcM (Maybe (Id, Id))
572 -- Returns a pair of the boot dfun in terms of the equivalent real dfun
574 = case [dfun | inst <- local_insts,
575 let dfun = instanceDFunId inst,
576 idType dfun `tcEqType` boot_inst_ty ] of
577 [] -> do { addErrTc (instMisMatch boot_inst); return Nothing }
578 (dfun:_) -> return (Just (local_boot_dfun, dfun))
580 boot_dfun = instanceDFunId boot_inst
581 boot_inst_ty = idType boot_dfun
582 local_boot_dfun = Id.mkExportedLocalId (idName boot_dfun) boot_inst_ty
586 missingBootThing thing what
587 = ppr thing <+> ptext SLIT("is exported by the hs-boot file, but not")
588 <+> text what <+> ptext SLIT("the module")
590 bootMisMatch thing boot_decl real_decl
591 = vcat [ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file"),
592 ptext SLIT("Main module:") <+> ppr real_decl,
593 ptext SLIT("Boot file: ") <+> ppr boot_decl]
597 2 (ptext SLIT("is defined in the hs-boot file, but not in the module itself"))
601 %************************************************************************
603 Type-checking the top level of a module
605 %************************************************************************
607 tcRnGroup takes a bunch of top-level source-code declarations, and
609 * gets supporting declarations from interface files
612 * and augments the TcGblEnv with the results
614 In Template Haskell it may be called repeatedly for each group of
615 declarations. It expects there to be an incoming TcGblEnv in the
616 monad; it augments it and returns the new TcGblEnv.
619 ------------------------------------------------
620 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
622 = do { -- Bring top level binders into scope
623 tcg_env <- importsFromLocalDecls group ;
624 setGblEnv tcg_env $ do {
626 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
628 -- Rename the source decls
629 (tcg_env, rn_decls) <- rnSrcDecls group ;
632 -- save the renamed syntax, if we want it
634 | Just grp <- tcg_rn_decls tcg_env
635 = tcg_env{ tcg_rn_decls = Just (appendGroups grp rn_decls) }
639 -- Dump trace of renaming part
640 rnDump (ppr rn_decls) ;
642 return (tcg_env', rn_decls)
645 ------------------------------------------------
646 tcTopSrcDecls :: ModDetails -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
647 tcTopSrcDecls boot_details
648 (HsGroup { hs_tyclds = tycl_decls,
649 hs_instds = inst_decls,
650 hs_derivds = deriv_decls,
651 hs_fords = foreign_decls,
652 hs_defds = default_decls,
653 hs_ruleds = rule_decls,
654 hs_valds = val_binds })
655 = do { -- Type-check the type and class decls, and all imported decls
656 -- The latter come in via tycl_decls
657 traceTc (text "Tc2") ;
659 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_details tycl_decls) ;
660 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
661 -- an error we'd better stop now, to avoid a cascade
663 -- Make these type and class decls available to stuff slurped from interface files
664 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
667 setGblEnv tcg_env $ do {
668 -- Source-language instances, including derivings,
669 -- and import the supporting declarations
670 traceTc (text "Tc3") ;
671 (tcg_env, inst_infos, deriv_binds)
672 <- tcInstDecls1 tycl_decls inst_decls deriv_decls;
673 setGblEnv tcg_env $ do {
675 -- Foreign import declarations next. No zonking necessary
676 -- here; we can tuck them straight into the global environment.
677 traceTc (text "Tc4") ;
678 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
679 tcExtendGlobalValEnv fi_ids $ do {
681 -- Default declarations
682 traceTc (text "Tc4a") ;
683 default_tys <- tcDefaults default_decls ;
684 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
686 -- Value declarations next
687 -- We also typecheck any extra binds that came out
688 -- of the "deriving" process (deriv_binds)
689 traceTc (text "Tc5") ;
690 (tc_val_binds, tcl_env) <- tcTopBinds (val_binds `plusHsValBinds` deriv_binds) ;
691 setLclTypeEnv tcl_env $ do {
693 -- Second pass over class and instance declarations,
694 traceTc (text "Tc6") ;
695 (inst_binds, tcl_env) <- tcInstDecls2 tycl_decls inst_infos ;
696 showLIE (text "after instDecls2") ;
699 -- They need to be zonked, so we return them
700 traceTc (text "Tc7") ;
701 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
704 rules <- tcRules rule_decls ;
707 traceTc (text "Tc7a") ;
708 tcg_env <- getGblEnv ;
709 let { all_binds = tc_val_binds `unionBags`
710 inst_binds `unionBags`
713 -- Extend the GblEnv with the (as yet un-zonked)
714 -- bindings, rules, foreign decls
715 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
716 tcg_rules = tcg_rules tcg_env ++ rules,
717 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
718 return (tcg_env', tcl_env)
723 %************************************************************************
727 %************************************************************************
730 checkMain :: TcM TcGblEnv
731 -- If we are in module Main, check that 'main' is defined.
733 = do { tcg_env <- getGblEnv ;
735 let { main_mod = mainModIs dflags ;
736 main_fn = case mainFunIs dflags of {
737 Just fn -> mkRdrUnqual (mkVarOccFS (mkFastString fn)) ;
738 Nothing -> main_RDR_Unqual } } ;
740 check_main dflags tcg_env main_mod main_fn
744 check_main dflags tcg_env main_mod main_fn
746 = traceTc (text "checkMain not" <+> ppr main_mod <+> ppr mod) >>
750 = addErrCtxt mainCtxt $
751 do { mb_main <- lookupSrcOcc_maybe main_fn
752 -- Check that 'main' is in scope
753 -- It might be imported from another module!
755 Nothing -> do { traceTc (text "checkMain fail" <+> ppr main_mod <+> ppr main_fn)
759 { traceTc (text "checkMain found" <+> ppr main_mod <+> ppr main_fn)
760 ; let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
761 -- :Main.main :: IO () = runMainIO main
763 ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
766 -- See Note [Root-main Id]
767 ; let { root_main_name = mkExternalName rootMainKey rOOT_MAIN
768 (mkVarOccFS FSLIT("main"))
769 (getSrcLoc main_name)
770 ; root_main_id = Id.mkExportedLocalId root_main_name ty
771 ; main_bind = noLoc (VarBind root_main_id main_expr) }
773 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
775 tcg_dus = tcg_dus tcg_env
776 `plusDU` usesOnly (unitFV main_name)
777 -- Record the use of 'main', so that we don't
778 -- complain about it being defined but not used
782 mod = tcg_mod tcg_env
784 complain_no_main | ghcLink dflags == LinkInMemory = return ()
785 | otherwise = failWithTc noMainMsg
786 -- In interactive mode, don't worry about the absence of 'main'
787 -- In other modes, fail altogether, so that we don't go on
788 -- and complain a second time when processing the export list.
790 mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
791 noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
792 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
797 The function that the RTS invokes is always :Main.main, which we call
798 root_main_id. (Because GHC allows the user to have a module not
799 called Main as the main module, we can't rely on the main function
800 being called "Main.main". That's why root_main_id has a fixed module
803 This is unusual: it's a LocalId whose Name has a Module from another
804 module. Tiresomely, we must filter it out again in MkIface, les we
805 get two defns for 'main' in the interface file!
808 %*********************************************************
812 %*********************************************************
816 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
817 setInteractiveContext hsc_env icxt thing_inside
819 -- Initialise the tcg_inst_env with instances
820 -- from all home modules. This mimics the more selective
821 -- call to hptInstances in tcRnModule
822 dfuns = hptInstances hsc_env (\mod -> True)
824 updGblEnv (\env -> env {
825 tcg_rdr_env = ic_rn_gbl_env icxt,
826 tcg_type_env = ic_type_env icxt,
827 tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
829 updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
831 do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
838 -> InteractiveContext
840 -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
841 -- The returned [Name] is the same as the input except for
842 -- ExprStmt, in which case the returned [Name] is [itName]
844 -- The returned TypecheckedHsExpr is of type IO [ () ],
845 -- a list of the bound values, coerced to ().
847 tcRnStmt hsc_env ictxt rdr_stmt
848 = initTcPrintErrors hsc_env iNTERACTIVE $
849 setInteractiveContext hsc_env ictxt $ do {
851 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
852 (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
853 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
856 -- The real work is done here
857 (bound_ids, tc_expr) <- mkPlan rn_stmt ;
858 zonked_expr <- zonkTopLExpr tc_expr ;
859 zonked_ids <- zonkTopBndrs bound_ids ;
861 -- None of the Ids should be of unboxed type, because we
862 -- cast them all to HValues in the end!
863 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
865 traceTc (text "tcs 1") ;
866 let { -- (a) Make all the bound ids "global" ids, now that
867 -- they're notionally top-level bindings. This is
868 -- important: otherwise when we come to compile an expression
869 -- using these ids later, the byte code generator will consider
870 -- the occurrences to be free rather than global.
872 -- (b) Tidy their types; this is important, because :info may
873 -- ask to look at them, and :info expects the things it looks
874 -- up to have tidy types
875 global_ids = map globaliseAndTidy zonked_ids ;
877 -- Update the interactive context
878 rn_env = ic_rn_local_env ictxt ;
879 type_env = ic_type_env ictxt ;
881 bound_names = map idName global_ids ;
882 new_rn_env = extendLocalRdrEnv rn_env bound_names ;
884 {- ---------------------------------------------
885 At one stage I removed any shadowed bindings from the type_env;
886 they are inaccessible but might, I suppose, cause a space leak if we leave them there.
887 However, with Template Haskell they aren't necessarily inaccessible. Consider this
889 Prelude> let f n = n * 2 :: Int
890 Prelude> fName <- runQ [| f |]
891 Prelude> $(return $ AppE fName (LitE (IntegerL 7)))
893 Prelude> let f n = n * 3 :: Int
894 Prelude> $(return $ AppE fName (LitE (IntegerL 7)))
895 In the last line we use 'fName', which resolves to the *first* 'f'
896 in scope. If we delete it from the type env, GHCi crashes because
897 it doesn't expect that.
899 Hence this code is commented out
901 shadowed = [ n | name <- bound_names,
902 let rdr_name = mkRdrUnqual (nameOccName name),
903 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
904 filtered_type_env = delListFromNameEnv type_env shadowed ;
905 -------------------------------------------------- -}
907 new_type_env = extendTypeEnvWithIds type_env global_ids ;
908 new_ic = ictxt { ic_rn_local_env = new_rn_env,
909 ic_type_env = new_type_env }
912 dumpOptTcRn Opt_D_dump_tc
913 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
914 text "Typechecked expr" <+> ppr zonked_expr]) ;
916 returnM (new_ic, bound_names, zonked_expr)
919 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
920 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
922 globaliseAndTidy :: Id -> Id
924 -- Give the Id a Global Name, and tidy its type
925 = Id.setIdType (globaliseId VanillaGlobal id) tidy_type
927 tidy_type = tidyTopType (idType id)
930 Here is the grand plan, implemented in tcUserStmt
932 What you type The IO [HValue] that hscStmt returns
933 ------------- ------------------------------------
934 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
937 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
940 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
941 [NB: result not printed] bindings: [it]
943 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
944 result showable) bindings: [it]
946 expr (of non-IO type,
947 result not showable) ==> error
951 ---------------------------
952 type PlanResult = ([Id], LHsExpr Id)
953 type Plan = TcM PlanResult
955 runPlans :: [Plan] -> TcM PlanResult
956 -- Try the plans in order. If one fails (by raising an exn), try the next.
957 -- If one succeeds, take it.
958 runPlans [] = panic "runPlans"
960 runPlans (p:ps) = tryTcLIE_ (runPlans ps) p
963 mkPlan :: LStmt Name -> TcM PlanResult
964 mkPlan (L loc (ExprStmt expr _ _)) -- An expression typed at the prompt
965 = do { uniq <- newUnique -- is treated very specially
966 ; let fresh_it = itName uniq
967 the_bind = L loc $ mkFunBind (L loc fresh_it) matches
968 matches = [mkMatch [] expr emptyLocalBinds]
969 let_stmt = L loc $ LetStmt (HsValBinds (ValBindsOut [(NonRecursive,unitBag the_bind)] []))
970 bind_stmt = L loc $ BindStmt (nlVarPat fresh_it) expr
971 (HsVar bindIOName) noSyntaxExpr
972 print_it = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
973 (HsVar thenIOName) placeHolderType
976 -- [it <- e; print it] but not if it::()
978 -- [let it = e; print it]
979 ; runPlans [ -- Plan A
980 do { stuff@([it_id], _) <- tcGhciStmts [bind_stmt, print_it]
981 ; it_ty <- zonkTcType (idType it_id)
982 ; ifM (isUnitTy it_ty) failM
985 -- Plan B; a naked bind statment
986 tcGhciStmts [bind_stmt],
988 -- Plan C; check that the let-binding is typeable all by itself.
989 -- If not, fail; if so, try to print it.
990 -- The two-step process avoids getting two errors: one from
991 -- the expression itself, and one from the 'print it' part
992 -- This two-step story is very clunky, alas
993 do { checkNoErrs (tcGhciStmts [let_stmt])
994 --- checkNoErrs defeats the error recovery of let-bindings
995 ; tcGhciStmts [let_stmt, print_it] }
998 mkPlan stmt@(L loc (BindStmt {}))
999 | [L _ v] <- collectLStmtBinders stmt -- One binder, for a bind stmt
1000 = do { let print_v = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar v))
1001 (HsVar thenIOName) placeHolderType
1003 ; print_bind_result <- doptM Opt_PrintBindResult
1004 ; let print_plan = do
1005 { stuff@([v_id], _) <- tcGhciStmts [stmt, print_v]
1006 ; v_ty <- zonkTcType (idType v_id)
1007 ; ifM (isUnitTy v_ty || not (isTauTy v_ty)) failM
1011 -- [stmt; print v] but not if v::()
1013 ; runPlans ((if print_bind_result then [print_plan] else []) ++
1014 [tcGhciStmts [stmt]])
1018 = tcGhciStmts [stmt]
1020 ---------------------------
1021 tcGhciStmts :: [LStmt Name] -> TcM PlanResult
1023 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
1024 ret_id <- tcLookupId returnIOName ; -- return @ IO
1026 io_ty = mkTyConApp ioTyCon [] ;
1027 ret_ty = mkListTy unitTy ;
1028 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
1029 tc_io_stmts stmts = tcStmts DoExpr (tcDoStmt io_ty) stmts
1030 (emptyRefinement, io_ret_ty) ;
1032 names = map unLoc (collectLStmtsBinders stmts) ;
1034 -- mk_return builds the expression
1035 -- returnIO @ [()] [coerce () x, .., coerce () z]
1037 -- Despite the inconvenience of building the type applications etc,
1038 -- this *has* to be done in type-annotated post-typecheck form
1039 -- because we are going to return a list of *polymorphic* values
1040 -- coerced to type (). If we built a *source* stmt
1041 -- return [coerce x, ..., coerce z]
1042 -- then the type checker would instantiate x..z, and we wouldn't
1043 -- get their *polymorphic* values. (And we'd get ambiguity errs
1044 -- if they were overloaded, since they aren't applied to anything.)
1045 mk_return ids = nlHsApp (nlHsTyApp ret_id [ret_ty])
1046 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
1047 mk_item id = nlHsApp (nlHsTyApp unsafeCoerceId [idType id, unitTy])
1051 -- OK, we're ready to typecheck the stmts
1052 traceTc (text "tcs 2") ;
1053 ((tc_stmts, ids), lie) <- getLIE $ tc_io_stmts stmts $ \ _ ->
1054 mappM tcLookupId names ;
1055 -- Look up the names right in the middle,
1056 -- where they will all be in scope
1058 -- Simplify the context
1059 const_binds <- checkNoErrs (tcSimplifyInteractive lie) ;
1060 -- checkNoErrs ensures that the plan fails if context redn fails
1062 return (ids, mkHsDictLet const_binds $
1063 noLoc (HsDo DoExpr tc_stmts (mk_return ids) io_ret_ty))
1068 tcRnExpr just finds the type of an expression
1072 -> InteractiveContext
1075 tcRnExpr hsc_env ictxt rdr_expr
1076 = initTcPrintErrors hsc_env iNTERACTIVE $
1077 setInteractiveContext hsc_env ictxt $ do {
1079 (rn_expr, fvs) <- rnLExpr rdr_expr ;
1082 -- Now typecheck the expression;
1083 -- it might have a rank-2 type (e.g. :t runST)
1084 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
1085 ((qtvs, dict_insts, _), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
1086 tcSimplifyInteractive lie_top ;
1088 let { all_expr_ty = mkForAllTys qtvs $
1089 mkFunTys (map (idType . instToId) dict_insts) $
1091 zonkTcType all_expr_ty
1094 smpl_doc = ptext SLIT("main expression")
1097 tcRnType just finds the kind of a type
1101 -> InteractiveContext
1104 tcRnType hsc_env ictxt rdr_type
1105 = initTcPrintErrors hsc_env iNTERACTIVE $
1106 setInteractiveContext hsc_env ictxt $ do {
1108 rn_type <- rnLHsType doc rdr_type ;
1111 -- Now kind-check the type
1112 (ty', kind) <- kcHsType rn_type ;
1116 doc = ptext SLIT("In GHCi input")
1122 %************************************************************************
1124 More GHCi stuff, to do with browsing and getting info
1126 %************************************************************************
1130 -- ASSUMES that the module is either in the HomePackageTable or is
1131 -- a package module with an interface on disk. If neither of these is
1132 -- true, then the result will be an error indicating the interface
1133 -- could not be found.
1134 getModuleExports :: HscEnv -> Module -> IO (Messages, Maybe [AvailInfo])
1135 getModuleExports hsc_env mod
1138 checkMods = ic_toplev_scope ic ++ ic_exports ic
1140 initTc hsc_env HsSrcFile False iNTERACTIVE (tcGetModuleExports mod checkMods)
1142 -- Get the export avail info and also load all orphan and family-instance
1143 -- modules. Finally, check that the family instances of all modules in the
1144 -- interactive context are consistent (these modules are in the second
1146 tcGetModuleExports :: Module -> [Module] -> TcM [AvailInfo]
1147 tcGetModuleExports mod directlyImpMods
1148 = do { let doc = ptext SLIT("context for compiling statements")
1149 ; iface <- initIfaceTcRn $ loadSysInterface doc mod
1151 -- Load any orphan-module and family instance-module
1152 -- interfaces, so their instances are visible.
1153 ; loadOrphanModules (dep_orphs (mi_deps iface)) False
1154 ; loadOrphanModules (dep_finsts (mi_deps iface)) True
1156 -- Check that the family instances of all directly loaded
1157 -- modules are consistent.
1158 ; checkFamInstConsistency (dep_finsts (mi_deps iface)) directlyImpMods
1160 ; ifaceExportNames (mi_exports iface)
1163 tcRnLookupRdrName :: HscEnv -> RdrName -> IO (Maybe [Name])
1164 tcRnLookupRdrName hsc_env rdr_name
1165 = initTcPrintErrors hsc_env iNTERACTIVE $
1166 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1167 lookup_rdr_name rdr_name
1169 lookup_rdr_name rdr_name = do {
1170 -- If the identifier is a constructor (begins with an
1171 -- upper-case letter), then we need to consider both
1172 -- constructor and type class identifiers.
1173 let { rdr_names = dataTcOccs rdr_name } ;
1175 -- results :: [Either Messages Name]
1176 results <- mapM (tryTcErrs . lookupOccRn) rdr_names ;
1178 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1179 -- The successful lookups will be (Just name)
1180 let { (warns_s, good_names) = unzip [ (msgs, name)
1181 | (msgs, Just name) <- results] ;
1182 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1184 -- Fail if nothing good happened, else add warnings
1185 if null good_names then
1186 -- No lookup succeeded, so
1187 -- pick the first error message and report it
1188 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1189 -- while the other is "X is not in scope",
1190 -- we definitely want the former; but we might pick the latter
1191 do { addMessages (head errs_s) ; failM }
1192 else -- Add deprecation warnings
1193 mapM_ addMessages warns_s ;
1198 tcRnRecoverDataCon :: HscEnv -> Ptr () -> IO (Maybe DataCon)
1199 tcRnRecoverDataCon hsc_env ptr
1200 = initTcPrintErrors hsc_env iNTERACTIVE $
1201 setInteractiveContext hsc_env (hsc_IC hsc_env) $ do
1202 name <- dataConInfoPtrToName ptr
1203 tcLookupDataCon name
1205 tcRnLookupName :: HscEnv -> Name -> IO (Maybe TyThing)
1206 tcRnLookupName hsc_env name
1207 = initTcPrintErrors hsc_env iNTERACTIVE $
1208 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1212 tcRnGetInfo :: HscEnv
1214 -> IO (Maybe (TyThing, Fixity, [Instance]))
1216 -- Used to implemnent :info in GHCi
1218 -- Look up a RdrName and return all the TyThings it might be
1219 -- A capitalised RdrName is given to us in the DataName namespace,
1220 -- but we want to treat it as *both* a data constructor
1221 -- *and* as a type or class constructor;
1222 -- hence the call to dataTcOccs, and we return up to two results
1223 tcRnGetInfo hsc_env name
1224 = initTcPrintErrors hsc_env iNTERACTIVE $
1225 let ictxt = hsc_IC hsc_env in
1226 setInteractiveContext hsc_env ictxt $ do
1228 -- Load the interface for all unqualified types and classes
1229 -- That way we will find all the instance declarations
1230 -- (Packages have not orphan modules, and we assume that
1231 -- in the home package all relevant modules are loaded.)
1232 loadUnqualIfaces ictxt
1234 thing <- tcLookupGlobal name
1235 fixity <- lookupFixityRn name
1236 ispecs <- lookupInsts (icPrintUnqual ictxt) thing
1237 return (thing, fixity, ispecs)
1239 lookupInsts :: PrintUnqualified -> TyThing -> TcM [Instance]
1240 -- Filter the instances by the ones whose tycons (or clases resp)
1241 -- are in scope unqualified. Otherwise we list a whole lot too many!
1242 lookupInsts print_unqual (AClass cls)
1243 = do { inst_envs <- tcGetInstEnvs
1245 | ispec <- classInstances inst_envs cls
1246 , plausibleDFun print_unqual (instanceDFunId ispec) ] }
1248 lookupInsts print_unqual (ATyCon tc)
1249 = do { eps <- getEps -- Load all instances for all classes that are
1250 -- in the type environment (which are all the ones
1251 -- we've seen in any interface file so far)
1252 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1254 | ispec <- instEnvElts home_ie ++ instEnvElts pkg_ie
1255 , let dfun = instanceDFunId ispec
1257 , plausibleDFun print_unqual dfun ] }
1259 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1260 tc_name = tyConName tc
1262 lookupInsts print_unqual other = return []
1264 plausibleDFun print_unqual dfun -- Dfun involving only names that print unqualified
1265 = all ok (nameSetToList (tyClsNamesOfType (idType dfun)))
1267 ok name | isBuiltInSyntax name = True
1268 | isExternalName name =
1269 isNothing $ fst print_unqual (nameModule name)
1273 loadUnqualIfaces :: InteractiveContext -> TcM ()
1274 -- Load the home module for everything that is in scope unqualified
1275 -- This is so that we can accurately report the instances for
1277 loadUnqualIfaces ictxt
1279 mapM_ (loadSysInterface doc) (moduleSetElts (mkModuleSet unqual_mods))
1281 unqual_mods = [ nameModule name
1282 | gre <- globalRdrEnvElts (ic_rn_gbl_env ictxt),
1283 let name = gre_name gre,
1284 not (isInternalName name),
1285 isTcOcc (nameOccName name), -- Types and classes only
1286 unQualOK gre ] -- In scope unqualified
1287 doc = ptext SLIT("Need interface for module whose export(s) are in scope unqualified")
1291 %************************************************************************
1295 %************************************************************************
1298 rnDump :: SDoc -> TcRn ()
1299 -- Dump, with a banner, if -ddump-rn
1300 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1302 tcDump :: TcGblEnv -> TcRn ()
1304 = do { dflags <- getDOpts ;
1306 -- Dump short output if -ddump-types or -ddump-tc
1307 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1308 (dumpTcRn short_dump) ;
1310 -- Dump bindings if -ddump-tc
1311 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1314 short_dump = pprTcGblEnv env
1315 full_dump = pprLHsBinds (tcg_binds env)
1316 -- NB: foreign x-d's have undefined's in their types;
1317 -- hence can't show the tc_fords
1320 = do { dflags <- getDOpts ;
1321 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1322 (dumpTcRn (pprModGuts mod_guts)) ;
1324 -- Dump bindings if -ddump-tc
1325 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1327 full_dump = pprCoreBindings (mg_binds mod_guts)
1329 -- It's unpleasant having both pprModGuts and pprModDetails here
1330 pprTcGblEnv :: TcGblEnv -> SDoc
1331 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1333 tcg_fam_insts = fam_insts,
1335 tcg_imports = imports })
1336 = vcat [ ppr_types insts type_env
1337 , ppr_tycons fam_insts type_env
1339 , ppr_fam_insts fam_insts
1340 , vcat (map ppr rules)
1341 , ppr_gen_tycons (typeEnvTyCons type_env)
1342 , ptext SLIT("Dependent modules:") <+> ppr (eltsUFM (imp_dep_mods imports))
1343 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1345 pprModGuts :: ModGuts -> SDoc
1346 pprModGuts (ModGuts { mg_types = type_env,
1348 = vcat [ ppr_types [] type_env,
1351 ppr_types :: [Instance] -> TypeEnv -> SDoc
1352 ppr_types insts type_env
1353 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1355 dfun_ids = map instanceDFunId insts
1356 ids = [id | id <- typeEnvIds type_env, want_sig id]
1357 want_sig id | opt_PprStyle_Debug = True
1358 | otherwise = isLocalId id &&
1359 isExternalName (idName id) &&
1360 not (id `elem` dfun_ids)
1361 -- isLocalId ignores data constructors, records selectors etc.
1362 -- The isExternalName ignores local dictionary and method bindings
1363 -- that the type checker has invented. Top-level user-defined things
1364 -- have External names.
1366 ppr_tycons :: [FamInst] -> TypeEnv -> SDoc
1367 ppr_tycons fam_insts type_env
1368 = text "TYPE CONSTRUCTORS" $$ nest 4 (ppr_tydecls tycons)
1370 fi_tycons = map famInstTyCon fam_insts
1371 tycons = [tycon | tycon <- typeEnvTyCons type_env, want_tycon tycon]
1372 want_tycon tycon | opt_PprStyle_Debug = True
1373 | otherwise = not (isImplicitTyCon tycon) &&
1374 isExternalName (tyConName tycon) &&
1375 not (tycon `elem` fi_tycons)
1377 ppr_insts :: [Instance] -> SDoc
1378 ppr_insts [] = empty
1379 ppr_insts ispecs = text "INSTANCES" $$ nest 2 (pprInstances ispecs)
1381 ppr_fam_insts :: [FamInst] -> SDoc
1382 ppr_fam_insts [] = empty
1383 ppr_fam_insts fam_insts =
1384 text "FAMILY INSTANCES" $$ nest 2 (pprFamInsts fam_insts)
1386 ppr_sigs :: [Var] -> SDoc
1388 -- Print type signatures; sort by OccName
1389 = vcat (map ppr_sig (sortLe le_sig ids))
1391 le_sig id1 id2 = getOccName id1 <= getOccName id2
1392 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1394 ppr_tydecls :: [TyCon] -> SDoc
1396 -- Print type constructor info; sort by OccName
1397 = vcat (map ppr_tycon (sortLe le_sig tycons))
1399 le_sig tycon1 tycon2 = getOccName tycon1 <= getOccName tycon2
1401 | isCoercionTyCon tycon = ptext SLIT("coercion") <+> ppr tycon
1402 | otherwise = ppr (tyThingToIfaceDecl (ATyCon tycon))
1404 ppr_rules :: [CoreRule] -> SDoc
1405 ppr_rules [] = empty
1406 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1407 nest 4 (pprRules rs),
1410 ppr_gen_tycons [] = empty
1411 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1412 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]