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 )
90 import {- Kind parts of -} Type
99 import Control.Monad ( unless )
104 %************************************************************************
106 Typecheck and rename a module
108 %************************************************************************
114 -> Bool -- True <=> save renamed syntax
115 -> Located (HsModule RdrName)
116 -> IO (Messages, Maybe TcGblEnv)
118 tcRnModule hsc_env hsc_src save_rn_syntax
119 (L loc (HsModule maybe_mod export_ies
120 import_decls local_decls mod_deprec _
121 module_info maybe_doc))
122 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
124 let { this_pkg = thisPackage (hsc_dflags hsc_env) ;
125 this_mod = case maybe_mod of
126 Nothing -> mAIN -- 'module M where' is omitted
127 Just (L _ mod) -> mkModule this_pkg mod } ;
130 initTc hsc_env hsc_src save_rn_syntax this_mod $
132 do { -- Deal with imports;
133 tcg_env <- tcRnImports hsc_env this_mod import_decls ;
134 setGblEnv tcg_env $ do {
136 -- Load the hi-boot interface for this module, if any
137 -- We do this now so that the boot_names can be passed
138 -- to tcTyAndClassDecls, because the boot_names are
139 -- automatically considered to be loop breakers
141 -- Do this *after* tcRnImports, so that we know whether
142 -- a module that we import imports us; and hence whether to
143 -- look for a hi-boot file
144 boot_iface <- tcHiBootIface hsc_src this_mod ;
146 -- Rename and type check the declarations
147 traceRn (text "rn1a") ;
148 tcg_env <- if isHsBoot hsc_src then
149 tcRnHsBootDecls local_decls
151 tcRnSrcDecls boot_iface local_decls ;
152 setGblEnv tcg_env $ do {
154 -- Report the use of any deprecated things
155 -- We do this *before* processsing the export list so
156 -- that we don't bleat about re-exporting a deprecated
157 -- thing (especially via 'module Foo' export item)
158 -- That is, only uses in the *body* of the module are complained about
159 traceRn (text "rn3") ;
160 failIfErrsM ; -- finishDeprecations crashes sometimes
161 -- as a result of typechecker repairs (e.g. unboundNames)
162 tcg_env <- finishDeprecations (hsc_dflags hsc_env) mod_deprec tcg_env ;
164 -- Process the export list
165 tcg_env <- rnExports (isJust maybe_mod) export_ies tcg_env ;
166 traceRn (text "rn4") ;
168 -- Compare the hi-boot iface (if any) with the real thing
169 -- Must be done after processing the exports
170 tcg_env <- checkHiBootIface tcg_env boot_iface ;
172 -- Make the new type env available to stuff slurped from interface files
173 -- Must do this after checkHiBootIface, because the latter might add new
174 -- bindings for boot_dfuns, which may be mentioned in imported unfoldings
175 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
177 -- Rename the Haddock documentation
178 tcg_env <- rnHaddock module_info maybe_doc tcg_env ;
180 -- Report unused names
181 reportUnusedNames export_ies tcg_env ;
183 -- Dump output and return
190 %************************************************************************
194 %************************************************************************
197 tcRnImports :: HscEnv -> Module -> [LImportDecl RdrName] -> TcM TcGblEnv
198 tcRnImports hsc_env this_mod import_decls
199 = do { (rn_imports, rdr_env, imports) <- rnImports import_decls ;
201 ; let { dep_mods :: ModuleNameEnv (ModuleName, IsBootInterface)
202 ; dep_mods = imp_dep_mods imports
204 -- We want instance declarations from all home-package
205 -- modules below this one, including boot modules, except
206 -- ourselves. The 'except ourselves' is so that we don't
207 -- get the instances from this module's hs-boot file
208 ; want_instances :: ModuleName -> Bool
209 ; want_instances mod = mod `elemUFM` dep_mods
210 && mod /= moduleName this_mod
211 ; home_insts = hptInstances hsc_env want_instances
214 -- Record boot-file info in the EPS, so that it's
215 -- visible to loadHiBootInterface in tcRnSrcDecls,
216 -- and any other incrementally-performed imports
217 ; updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
219 -- Update the gbl env
220 ; updGblEnv ( \ gbl ->
221 gbl { tcg_rdr_env = plusOccEnv (tcg_rdr_env gbl) rdr_env,
222 tcg_imports = tcg_imports gbl `plusImportAvails` imports,
223 tcg_rn_imports = fmap (const rn_imports) (tcg_rn_imports gbl),
224 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts
227 ; traceRn (text "rn1" <+> ppr (imp_dep_mods imports))
228 -- Fail if there are any errors so far
229 -- The error printing (if needed) takes advantage
230 -- of the tcg_env we have now set
231 -- ; traceIf (text "rdr_env: " <+> ppr rdr_env)
234 -- Load any orphan-module and family instance-module
235 -- interfaces, so that their rules and instance decls will be
237 ; loadOrphanModules (imp_orphs imports) False
238 ; loadOrphanModules (imp_finsts imports) True
240 -- Check type-familily consistency
241 ; traceRn (text "rn1: checking family instance consistency")
242 ; let { dir_imp_mods = map (\ (mod, _, _) -> mod)
246 ; checkFamInstConsistency (imp_finsts imports) dir_imp_mods ;
252 %************************************************************************
254 Type-checking external-core modules
256 %************************************************************************
259 tcRnExtCore :: HscEnv
261 -> IO (Messages, Maybe ModGuts)
262 -- Nothing => some error occurred
264 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
265 -- The decls are IfaceDecls; all names are original names
266 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
268 initTc hsc_env ExtCoreFile False this_mod $ do {
270 let { ldecls = map noLoc decls } ;
272 -- Deal with the type declarations; first bring their stuff
273 -- into scope, then rname them, then type check them
274 tcg_env <- importsFromLocalDecls (mkFakeGroup ldecls) ;
276 setGblEnv tcg_env $ do {
278 rn_decls <- rnTyClDecls ldecls ;
281 -- Dump trace of renaming part
282 rnDump (ppr rn_decls) ;
284 -- Typecheck them all together so that
285 -- any mutually recursive types are done right
286 tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails rn_decls) ;
287 -- Make the new type env available to stuff slurped from interface files
289 setGblEnv tcg_env $ do {
291 -- Now the core bindings
292 core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
296 bndrs = bindersOfBinds core_binds ;
297 my_exports = map (Avail . idName) bndrs ;
298 -- ToDo: export the data types also?
300 final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
302 mod_guts = ModGuts { mg_module = this_mod,
304 mg_usages = [], -- ToDo: compute usage
305 mg_dir_imps = [], -- ??
306 mg_deps = noDependencies, -- ??
307 mg_exports = my_exports,
308 mg_types = final_type_env,
309 mg_insts = tcg_insts tcg_env,
310 mg_fam_insts = tcg_fam_insts tcg_env,
311 mg_fam_inst_env = tcg_fam_inst_env tcg_env,
313 mg_binds = core_binds,
316 mg_rdr_env = emptyGlobalRdrEnv,
317 mg_fix_env = emptyFixityEnv,
318 mg_deprecs = NoDeprecs,
319 mg_foreign = NoStubs,
320 mg_hpc_info = noHpcInfo,
321 mg_dbg_sites = noDbgSites
324 tcCoreDump mod_guts ;
329 mkFakeGroup decls -- Rather clumsy; lots of unused fields
330 = emptyRdrGroup { hs_tyclds = decls }
334 %************************************************************************
336 Type-checking the top level of a module
338 %************************************************************************
341 tcRnSrcDecls :: ModDetails -> [LHsDecl RdrName] -> TcM TcGblEnv
342 -- Returns the variables free in the decls
343 -- Reason: solely to report unused imports and bindings
344 tcRnSrcDecls boot_iface decls
345 = do { -- Do all the declarations
346 (tc_envs, lie) <- getLIE $ tc_rn_src_decls boot_iface decls ;
348 -- Finish simplifying class constraints
350 -- tcSimplifyTop deals with constant or ambiguous InstIds.
351 -- How could there be ambiguous ones? They can only arise if a
352 -- top-level decl falls under the monomorphism restriction
353 -- and no subsequent decl instantiates its type.
355 -- We do this after checkMain, so that we use the type info
356 -- thaat checkMain adds
358 -- We do it with both global and local env in scope:
359 -- * the global env exposes the instances to tcSimplifyTop
360 -- * the local env exposes the local Ids to tcSimplifyTop,
361 -- so that we get better error messages (monomorphism restriction)
362 traceTc (text "Tc8") ;
363 inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
365 -- Backsubstitution. This must be done last.
366 -- Even tcSimplifyTop may do some unification.
367 traceTc (text "Tc9") ;
368 let { (tcg_env, _) = tc_envs
369 ; TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
370 tcg_rules = rules, tcg_fords = fords } = tcg_env
371 ; all_binds = binds `unionBags` inst_binds } ;
373 (bind_ids, binds', fords', rules') <- zonkTopDecls all_binds rules fords ;
375 let { final_type_env = extendTypeEnvWithIds type_env bind_ids
376 ; tcg_env' = tcg_env { tcg_type_env = final_type_env,
379 tcg_fords = fords' } } ;
381 return (tcg_env' { tcg_binds = tcg_binds tcg_env' })
384 tc_rn_src_decls :: ModDetails -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
385 -- Loops around dealing with each top level inter-splice group
386 -- in turn, until it's dealt with the entire module
387 tc_rn_src_decls boot_details ds
388 = do { let { (first_group, group_tail) = findSplice ds } ;
389 -- If ds is [] we get ([], Nothing)
391 -- Deal with decls up to, but not including, the first splice
392 (tcg_env, rn_decls) <- checkNoErrs $ rnTopSrcDecls first_group ;
393 -- checkNoErrs: stop if renaming fails
395 (tcg_env, tcl_env) <- setGblEnv tcg_env $
396 tcTopSrcDecls boot_details rn_decls ;
398 -- If there is no splice, we're nearly done
399 setEnvs (tcg_env, tcl_env) $
401 Nothing -> do { tcg_env <- checkMain ; -- Check for `main'
402 return (tcg_env, tcl_env)
405 -- If there's a splice, we must carry on
406 Just (SpliceDecl splice_expr, rest_ds) -> do {
408 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
411 -- Rename the splice expression, and get its supporting decls
412 (rn_splice_expr, splice_fvs) <- checkNoErrs (rnLExpr splice_expr) ;
413 -- checkNoErrs: don't typecheck if renaming failed
414 rnDump (ppr rn_splice_expr) ;
416 -- Execute the splice
417 spliced_decls <- tcSpliceDecls rn_splice_expr ;
419 -- Glue them on the front of the remaining decls and loop
420 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
421 tc_rn_src_decls boot_details (spliced_decls ++ rest_ds)
426 %************************************************************************
428 Compiling hs-boot source files, and
429 comparing the hi-boot interface with the real thing
431 %************************************************************************
434 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
435 tcRnHsBootDecls decls
436 = do { let { (first_group, group_tail) = findSplice decls }
439 Just stuff -> spliceInHsBootErr stuff
442 -- Rename the declarations
443 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
444 ; setGblEnv tcg_env $ do {
446 -- Todo: check no foreign decls, no rules, no default decls
448 -- Typecheck type/class decls
449 ; traceTc (text "Tc2")
450 ; let tycl_decls = hs_tyclds rn_group
451 ; tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails tycl_decls)
452 ; setGblEnv tcg_env $ do {
454 -- Typecheck instance decls
455 ; traceTc (text "Tc3")
456 ; (tcg_env, inst_infos, _deriv_binds)
457 <- tcInstDecls1 tycl_decls (hs_instds rn_group) (hs_derivds rn_group)
458 ; setGblEnv tcg_env $ do {
460 -- Typecheck value declarations
461 ; traceTc (text "Tc5")
462 ; val_ids <- tcHsBootSigs (hs_valds rn_group)
465 -- No simplification or zonking to do
466 ; traceTc (text "Tc7a")
467 ; gbl_env <- getGblEnv
469 -- Make the final type-env
470 -- Include the dfun_ids so that their type sigs
471 -- are written into the interface file
472 ; let { type_env0 = tcg_type_env gbl_env
473 ; type_env1 = extendTypeEnvWithIds type_env0 val_ids
474 ; type_env2 = extendTypeEnvWithIds type_env1 dfun_ids
475 ; dfun_ids = map iDFunId inst_infos }
476 ; return (gbl_env { tcg_type_env = type_env2 })
479 spliceInHsBootErr (SpliceDecl (L loc _), _)
480 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
483 Once we've typechecked the body of the module, we want to compare what
484 we've found (gathered in a TypeEnv) with the hi-boot details (if any).
487 checkHiBootIface :: TcGblEnv -> ModDetails -> TcM TcGblEnv
488 -- Compare the hi-boot file for this module (if there is one)
489 -- with the type environment we've just come up with
490 -- In the common case where there is no hi-boot file, the list
491 -- of boot_names is empty.
493 -- The bindings we return give bindings for the dfuns defined in the
494 -- hs-boot file, such as $fbEqT = $fEqT
497 tcg_env@(TcGblEnv { tcg_src = hs_src, tcg_binds = binds,
498 tcg_insts = local_insts, tcg_fam_insts = local_fam_insts,
499 tcg_type_env = local_type_env, tcg_exports = local_exports })
500 (ModDetails { md_insts = boot_insts, md_fam_insts = boot_fam_insts,
501 md_types = boot_type_env, md_exports = boot_exports })
502 | isHsBoot hs_src -- Current module is already a hs-boot file!
506 = do { traceTc (text "checkHiBootIface" <+> (ppr boot_type_env $$ ppr boot_insts $$
509 -- Check the exports of the boot module, one by one
510 ; mapM_ check_export boot_exports
512 -- Check instance declarations
513 ; mb_dfun_prs <- mapM check_inst boot_insts
514 ; let tcg_env' = tcg_env { tcg_binds = binds `unionBags` dfun_binds,
515 tcg_type_env = extendTypeEnvWithIds local_type_env boot_dfuns }
516 dfun_prs = catMaybes mb_dfun_prs
517 boot_dfuns = map fst dfun_prs
518 dfun_binds = listToBag [ noLoc $ VarBind boot_dfun (nlHsVar dfun)
519 | (boot_dfun, dfun) <- dfun_prs ]
521 -- Check for no family instances
522 ; unless (null boot_fam_insts) $
523 panic ("TcRnDriver.checkHiBootIface: Cannot handle family " ++
524 "instances in boot files yet...")
525 -- FIXME: Why? The actual comparison is not hard, but what would
526 -- be the equivalent to the dfun bindings returned for class
527 -- instances? We can't easily equate tycons...
531 check_export boot_avail -- boot_avail is exported by the boot iface
532 | name `elem` dfun_names = return ()
533 | isWiredInName name = return () -- No checking for wired-in names. In particular,
534 -- 'error' is handled by a rather gross hack
535 -- (see comments in GHC.Err.hs-boot)
537 -- Check that the actual module exports the same thing
538 | not (null missing_names)
539 = addErrTc (missingBootThing (head missing_names) "exported by")
541 -- If the boot module does not *define* the thing, we are done
542 -- (it simply re-exports it, and names match, so nothing further to do)
543 | isNothing mb_boot_thing = return ()
545 -- Check that the actual module also defines the thing, and
546 -- then compare the definitions
547 | Just real_thing <- lookupTypeEnv local_type_env name
548 = do { let boot_decl = tyThingToIfaceDecl (fromJust mb_boot_thing)
549 real_decl = tyThingToIfaceDecl real_thing
550 ; checkTc (checkBootDecl boot_decl real_decl)
551 (bootMisMatch real_thing boot_decl real_decl) }
552 -- The easiest way to check compatibility is to convert to
553 -- iface syntax, where we already have good comparison functions
556 = addErrTc (missingBootThing name "defined in")
558 name = availName boot_avail
559 mb_boot_thing = lookupTypeEnv boot_type_env name
560 missing_names = case lookupNameEnv local_export_env name of
562 Just avail -> availNames boot_avail `minusList` availNames avail
564 dfun_names = map getName boot_insts
566 local_export_env :: NameEnv AvailInfo
567 local_export_env = availsToNameEnv local_exports
569 check_inst :: Instance -> TcM (Maybe (Id, Id))
570 -- Returns a pair of the boot dfun in terms of the equivalent real dfun
572 = case [dfun | inst <- local_insts,
573 let dfun = instanceDFunId inst,
574 idType dfun `tcEqType` boot_inst_ty ] of
575 [] -> do { addErrTc (instMisMatch boot_inst); return Nothing }
576 (dfun:_) -> return (Just (local_boot_dfun, dfun))
578 boot_dfun = instanceDFunId boot_inst
579 boot_inst_ty = idType boot_dfun
580 local_boot_dfun = Id.mkExportedLocalId (idName boot_dfun) boot_inst_ty
584 missingBootThing thing what
585 = ppr thing <+> ptext SLIT("is exported by the hs-boot file, but not")
586 <+> text what <+> ptext SLIT("the module")
588 bootMisMatch thing boot_decl real_decl
589 = vcat [ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file"),
590 ptext SLIT("Main module:") <+> ppr real_decl,
591 ptext SLIT("Boot file: ") <+> ppr boot_decl]
595 2 (ptext SLIT("is defined in the hs-boot file, but not in the module itself"))
599 %************************************************************************
601 Type-checking the top level of a module
603 %************************************************************************
605 tcRnGroup takes a bunch of top-level source-code declarations, and
607 * gets supporting declarations from interface files
610 * and augments the TcGblEnv with the results
612 In Template Haskell it may be called repeatedly for each group of
613 declarations. It expects there to be an incoming TcGblEnv in the
614 monad; it augments it and returns the new TcGblEnv.
617 ------------------------------------------------
618 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
620 = do { -- Bring top level binders into scope
621 tcg_env <- importsFromLocalDecls group ;
622 setGblEnv tcg_env $ do {
624 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
626 -- Rename the source decls
627 (tcg_env, rn_decls) <- rnSrcDecls group ;
630 -- save the renamed syntax, if we want it
632 | Just grp <- tcg_rn_decls tcg_env
633 = tcg_env{ tcg_rn_decls = Just (appendGroups grp rn_decls) }
637 -- Dump trace of renaming part
638 rnDump (ppr rn_decls) ;
640 return (tcg_env', rn_decls)
643 ------------------------------------------------
644 tcTopSrcDecls :: ModDetails -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
645 tcTopSrcDecls boot_details
646 (HsGroup { hs_tyclds = tycl_decls,
647 hs_instds = inst_decls,
648 hs_derivds = deriv_decls,
649 hs_fords = foreign_decls,
650 hs_defds = default_decls,
651 hs_ruleds = rule_decls,
652 hs_valds = val_binds })
653 = do { -- Type-check the type and class decls, and all imported decls
654 -- The latter come in via tycl_decls
655 traceTc (text "Tc2") ;
657 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_details tycl_decls) ;
658 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
659 -- an error we'd better stop now, to avoid a cascade
661 -- Make these type and class decls available to stuff slurped from interface files
662 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
665 setGblEnv tcg_env $ do {
666 -- Source-language instances, including derivings,
667 -- and import the supporting declarations
668 traceTc (text "Tc3") ;
669 (tcg_env, inst_infos, deriv_binds)
670 <- tcInstDecls1 tycl_decls inst_decls deriv_decls;
671 setGblEnv tcg_env $ do {
673 -- Foreign import declarations next. No zonking necessary
674 -- here; we can tuck them straight into the global environment.
675 traceTc (text "Tc4") ;
676 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
677 tcExtendGlobalValEnv fi_ids $ do {
679 -- Default declarations
680 traceTc (text "Tc4a") ;
681 default_tys <- tcDefaults default_decls ;
682 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
684 -- Value declarations next
685 -- We also typecheck any extra binds that came out
686 -- of the "deriving" process (deriv_binds)
687 traceTc (text "Tc5") ;
688 (tc_val_binds, tcl_env) <- tcTopBinds (val_binds `plusHsValBinds` deriv_binds) ;
689 setLclTypeEnv tcl_env $ do {
691 -- Second pass over class and instance declarations,
692 traceTc (text "Tc6") ;
693 (inst_binds, tcl_env) <- tcInstDecls2 tycl_decls inst_infos ;
694 showLIE (text "after instDecls2") ;
697 -- They need to be zonked, so we return them
698 traceTc (text "Tc7") ;
699 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
702 rules <- tcRules rule_decls ;
705 traceTc (text "Tc7a") ;
706 tcg_env <- getGblEnv ;
707 let { all_binds = tc_val_binds `unionBags`
708 inst_binds `unionBags`
711 -- Extend the GblEnv with the (as yet un-zonked)
712 -- bindings, rules, foreign decls
713 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
714 tcg_rules = tcg_rules tcg_env ++ rules,
715 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
716 return (tcg_env', tcl_env)
721 %************************************************************************
725 %************************************************************************
728 checkMain :: TcM TcGblEnv
729 -- If we are in module Main, check that 'main' is defined.
731 = do { ghc_mode <- getGhcMode ;
732 tcg_env <- getGblEnv ;
734 let { main_mod = mainModIs dflags ;
735 main_fn = case mainFunIs dflags of {
736 Just fn -> mkRdrUnqual (mkVarOccFS (mkFastString fn)) ;
737 Nothing -> main_RDR_Unqual } } ;
739 check_main ghc_mode tcg_env main_mod main_fn
743 check_main ghc_mode tcg_env main_mod main_fn
745 = traceTc (text "checkMain not" <+> ppr main_mod <+> ppr mod) >>
749 = addErrCtxt mainCtxt $
750 do { mb_main <- lookupSrcOcc_maybe main_fn
751 -- Check that 'main' is in scope
752 -- It might be imported from another module!
754 Nothing -> do { traceTc (text "checkMain fail" <+> ppr main_mod <+> ppr main_fn)
758 { traceTc (text "checkMain found" <+> ppr main_mod <+> ppr main_fn)
759 ; let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
760 -- :Main.main :: IO () = runMainIO main
762 ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
765 -- See Note [Root-main Id]
766 ; let { root_main_name = mkExternalName rootMainKey rOOT_MAIN
767 (mkVarOccFS FSLIT("main"))
768 (getSrcLoc main_name)
769 ; root_main_id = Id.mkExportedLocalId root_main_name ty
770 ; main_bind = noLoc (VarBind root_main_id main_expr) }
772 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
774 tcg_dus = tcg_dus tcg_env
775 `plusDU` usesOnly (unitFV main_name)
776 -- Record the use of 'main', so that we don't
777 -- complain about it being defined but not used
781 mod = tcg_mod tcg_env
783 complain_no_main | ghc_mode == Interactive = return ()
784 | otherwise = failWithTc noMainMsg
785 -- In interactive mode, don't worry about the absence of 'main'
786 -- In other modes, fail altogether, so that we don't go on
787 -- and complain a second time when processing the export list.
789 mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
790 noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
791 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
796 The function that the RTS invokes is always :Main.main, which we call
797 root_main_id. (Because GHC allows the user to have a module not
798 called Main as the main module, we can't rely on the main function
799 being called "Main.main". That's why root_main_id has a fixed module
802 This is unusual: it's a LocalId whose Name has a Module from another
803 module. Tiresomely, we must filter it out again in MkIface, les we
804 get two defns for 'main' in the interface file!
807 %*********************************************************
811 %*********************************************************
815 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
816 setInteractiveContext hsc_env icxt thing_inside
818 -- Initialise the tcg_inst_env with instances
819 -- from all home modules. This mimics the more selective
820 -- call to hptInstances in tcRnModule
821 dfuns = hptInstances hsc_env (\mod -> True)
823 updGblEnv (\env -> env {
824 tcg_rdr_env = ic_rn_gbl_env icxt,
825 tcg_type_env = ic_type_env icxt,
826 tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
828 updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
830 do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
837 -> InteractiveContext
839 -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
840 -- The returned [Name] is the same as the input except for
841 -- ExprStmt, in which case the returned [Name] is [itName]
843 -- The returned TypecheckedHsExpr is of type IO [ () ],
844 -- a list of the bound values, coerced to ().
846 tcRnStmt hsc_env ictxt rdr_stmt
847 = initTcPrintErrors hsc_env iNTERACTIVE $
848 setInteractiveContext hsc_env ictxt $ do {
850 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
851 (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
852 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
855 -- The real work is done here
856 (bound_ids, tc_expr) <- mkPlan rn_stmt ;
857 zonked_expr <- zonkTopLExpr tc_expr ;
858 zonked_ids <- zonkTopBndrs bound_ids ;
860 -- None of the Ids should be of unboxed type, because we
861 -- cast them all to HValues in the end!
862 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
864 traceTc (text "tcs 1") ;
865 let { -- (a) Make all the bound ids "global" ids, now that
866 -- they're notionally top-level bindings. This is
867 -- important: otherwise when we come to compile an expression
868 -- using these ids later, the byte code generator will consider
869 -- the occurrences to be free rather than global.
871 -- (b) Tidy their types; this is important, because :info may
872 -- ask to look at them, and :info expects the things it looks
873 -- up to have tidy types
874 global_ids = map globaliseAndTidy zonked_ids ;
876 -- Update the interactive context
877 rn_env = ic_rn_local_env ictxt ;
878 type_env = ic_type_env ictxt ;
880 bound_names = map idName global_ids ;
881 new_rn_env = extendLocalRdrEnv rn_env bound_names ;
883 {- ---------------------------------------------
884 At one stage I removed any shadowed bindings from the type_env;
885 they are inaccessible but might, I suppose, cause a space leak if we leave them there.
886 However, with Template Haskell they aren't necessarily inaccessible. Consider this
888 Prelude> let f n = n * 2 :: Int
889 Prelude> fName <- runQ [| f |]
890 Prelude> $(return $ AppE fName (LitE (IntegerL 7)))
892 Prelude> let f n = n * 3 :: Int
893 Prelude> $(return $ AppE fName (LitE (IntegerL 7)))
894 In the last line we use 'fName', which resolves to the *first* 'f'
895 in scope. If we delete it from the type env, GHCi crashes because
896 it doesn't expect that.
898 Hence this code is commented out
900 shadowed = [ n | name <- bound_names,
901 let rdr_name = mkRdrUnqual (nameOccName name),
902 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
903 filtered_type_env = delListFromNameEnv type_env shadowed ;
904 -------------------------------------------------- -}
906 new_type_env = extendTypeEnvWithIds type_env global_ids ;
907 new_ic = ictxt { ic_rn_local_env = new_rn_env,
908 ic_type_env = new_type_env }
911 dumpOptTcRn Opt_D_dump_tc
912 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
913 text "Typechecked expr" <+> ppr zonked_expr]) ;
915 returnM (new_ic, bound_names, zonked_expr)
918 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
919 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
921 globaliseAndTidy :: Id -> Id
923 -- Give the Id a Global Name, and tidy its type
924 = Id.setIdType (globaliseId VanillaGlobal id) tidy_type
926 tidy_type = tidyTopType (idType id)
929 Here is the grand plan, implemented in tcUserStmt
931 What you type The IO [HValue] that hscStmt returns
932 ------------- ------------------------------------
933 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
936 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
939 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
940 [NB: result not printed] bindings: [it]
942 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
943 result showable) bindings: [it]
945 expr (of non-IO type,
946 result not showable) ==> error
950 ---------------------------
951 type PlanResult = ([Id], LHsExpr Id)
952 type Plan = TcM PlanResult
954 runPlans :: [Plan] -> TcM PlanResult
955 -- Try the plans in order. If one fails (by raising an exn), try the next.
956 -- If one succeeds, take it.
957 runPlans [] = panic "runPlans"
959 runPlans (p:ps) = tryTcLIE_ (runPlans ps) p
962 mkPlan :: LStmt Name -> TcM PlanResult
963 mkPlan (L loc (ExprStmt expr _ _)) -- An expression typed at the prompt
964 = do { uniq <- newUnique -- is treated very specially
965 ; let fresh_it = itName uniq
966 the_bind = L loc $ mkFunBind (L loc fresh_it) matches
967 matches = [mkMatch [] expr emptyLocalBinds]
968 let_stmt = L loc $ LetStmt (HsValBinds (ValBindsOut [(NonRecursive,unitBag the_bind)] []))
969 bind_stmt = L loc $ BindStmt (nlVarPat fresh_it) expr
970 (HsVar bindIOName) noSyntaxExpr
971 print_it = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
972 (HsVar thenIOName) placeHolderType
975 -- [it <- e; print it] but not if it::()
977 -- [let it = e; print it]
978 ; runPlans [ -- Plan A
979 do { stuff@([it_id], _) <- tcGhciStmts [bind_stmt, print_it]
980 ; it_ty <- zonkTcType (idType it_id)
981 ; ifM (isUnitTy it_ty) failM
984 -- Plan B; a naked bind statment
985 tcGhciStmts [bind_stmt],
987 -- Plan C; check that the let-binding is typeable all by itself.
988 -- If not, fail; if so, try to print it.
989 -- The two-step process avoids getting two errors: one from
990 -- the expression itself, and one from the 'print it' part
991 -- This two-step story is very clunky, alas
992 do { checkNoErrs (tcGhciStmts [let_stmt])
993 --- checkNoErrs defeats the error recovery of let-bindings
994 ; tcGhciStmts [let_stmt, print_it] }
997 mkPlan stmt@(L loc (BindStmt {}))
998 | [L _ v] <- collectLStmtBinders stmt -- One binder, for a bind stmt
999 = do { let print_v = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar v))
1000 (HsVar thenIOName) placeHolderType
1002 ; print_bind_result <- doptM Opt_PrintBindResult
1003 ; let print_plan = do
1004 { stuff@([v_id], _) <- tcGhciStmts [stmt, print_v]
1005 ; v_ty <- zonkTcType (idType v_id)
1006 ; ifM (isUnitTy v_ty || not (isTauTy v_ty)) failM
1010 -- [stmt; print v] but not if v::()
1012 ; runPlans ((if print_bind_result then [print_plan] else []) ++
1013 [tcGhciStmts [stmt]])
1017 = tcGhciStmts [stmt]
1019 ---------------------------
1020 tcGhciStmts :: [LStmt Name] -> TcM PlanResult
1022 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
1023 ret_id <- tcLookupId returnIOName ; -- return @ IO
1025 io_ty = mkTyConApp ioTyCon [] ;
1026 ret_ty = mkListTy unitTy ;
1027 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
1028 tc_io_stmts stmts = tcStmts DoExpr (tcDoStmt io_ty) stmts
1029 (emptyRefinement, io_ret_ty) ;
1031 names = map unLoc (collectLStmtsBinders stmts) ;
1033 -- mk_return builds the expression
1034 -- returnIO @ [()] [coerce () x, .., coerce () z]
1036 -- Despite the inconvenience of building the type applications etc,
1037 -- this *has* to be done in type-annotated post-typecheck form
1038 -- because we are going to return a list of *polymorphic* values
1039 -- coerced to type (). If we built a *source* stmt
1040 -- return [coerce x, ..., coerce z]
1041 -- then the type checker would instantiate x..z, and we wouldn't
1042 -- get their *polymorphic* values. (And we'd get ambiguity errs
1043 -- if they were overloaded, since they aren't applied to anything.)
1044 mk_return ids = nlHsApp (nlHsTyApp ret_id [ret_ty])
1045 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
1046 mk_item id = nlHsApp (nlHsTyApp unsafeCoerceId [idType id, unitTy])
1050 -- OK, we're ready to typecheck the stmts
1051 traceTc (text "tcs 2") ;
1052 ((tc_stmts, ids), lie) <- getLIE $ tc_io_stmts stmts $ \ _ ->
1053 mappM tcLookupId names ;
1054 -- Look up the names right in the middle,
1055 -- where they will all be in scope
1057 -- Simplify the context
1058 const_binds <- checkNoErrs (tcSimplifyInteractive lie) ;
1059 -- checkNoErrs ensures that the plan fails if context redn fails
1061 return (ids, mkHsDictLet const_binds $
1062 noLoc (HsDo DoExpr tc_stmts (mk_return ids) io_ret_ty))
1067 tcRnExpr just finds the type of an expression
1071 -> InteractiveContext
1074 tcRnExpr hsc_env ictxt rdr_expr
1075 = initTcPrintErrors hsc_env iNTERACTIVE $
1076 setInteractiveContext hsc_env ictxt $ do {
1078 (rn_expr, fvs) <- rnLExpr rdr_expr ;
1081 -- Now typecheck the expression;
1082 -- it might have a rank-2 type (e.g. :t runST)
1083 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
1084 ((qtvs, dict_insts, _), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
1085 tcSimplifyInteractive lie_top ;
1087 let { all_expr_ty = mkForAllTys qtvs $
1088 mkFunTys (map (idType . instToId) dict_insts) $
1090 zonkTcType all_expr_ty
1093 smpl_doc = ptext SLIT("main expression")
1096 tcRnType just finds the kind of a type
1100 -> InteractiveContext
1103 tcRnType hsc_env ictxt rdr_type
1104 = initTcPrintErrors hsc_env iNTERACTIVE $
1105 setInteractiveContext hsc_env ictxt $ do {
1107 rn_type <- rnLHsType doc rdr_type ;
1110 -- Now kind-check the type
1111 (ty', kind) <- kcHsType rn_type ;
1115 doc = ptext SLIT("In GHCi input")
1121 %************************************************************************
1123 More GHCi stuff, to do with browsing and getting info
1125 %************************************************************************
1129 -- ASSUMES that the module is either in the HomePackageTable or is
1130 -- a package module with an interface on disk. If neither of these is
1131 -- true, then the result will be an error indicating the interface
1132 -- could not be found.
1133 getModuleExports :: HscEnv -> Module -> IO (Messages, Maybe [AvailInfo])
1134 getModuleExports hsc_env mod
1137 checkMods = ic_toplev_scope ic ++ ic_exports ic
1139 initTc hsc_env HsSrcFile False iNTERACTIVE (tcGetModuleExports mod checkMods)
1141 -- Get the export avail info and also load all orphan and family-instance
1142 -- modules. Finally, check that the family instances of all modules in the
1143 -- interactive context are consistent (these modules are in the second
1145 tcGetModuleExports :: Module -> [Module] -> TcM [AvailInfo]
1146 tcGetModuleExports mod directlyImpMods
1147 = do { let doc = ptext SLIT("context for compiling statements")
1148 ; iface <- initIfaceTcRn $ loadSysInterface doc mod
1150 -- Load any orphan-module and family instance-module
1151 -- interfaces, so their instances are visible.
1152 ; loadOrphanModules (dep_orphs (mi_deps iface)) False
1153 ; loadOrphanModules (dep_finsts (mi_deps iface)) True
1155 -- Check that the family instances of all directly loaded
1156 -- modules are consistent.
1157 ; checkFamInstConsistency (dep_finsts (mi_deps iface)) directlyImpMods
1159 ; ifaceExportNames (mi_exports iface)
1162 tcRnLookupRdrName :: HscEnv -> RdrName -> IO (Maybe [Name])
1163 tcRnLookupRdrName hsc_env rdr_name
1164 = initTcPrintErrors hsc_env iNTERACTIVE $
1165 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1166 lookup_rdr_name rdr_name
1168 lookup_rdr_name rdr_name = do {
1169 -- If the identifier is a constructor (begins with an
1170 -- upper-case letter), then we need to consider both
1171 -- constructor and type class identifiers.
1172 let { rdr_names = dataTcOccs rdr_name } ;
1174 -- results :: [Either Messages Name]
1175 results <- mapM (tryTcErrs . lookupOccRn) rdr_names ;
1177 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1178 -- The successful lookups will be (Just name)
1179 let { (warns_s, good_names) = unzip [ (msgs, name)
1180 | (msgs, Just name) <- results] ;
1181 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1183 -- Fail if nothing good happened, else add warnings
1184 if null good_names then
1185 -- No lookup succeeded, so
1186 -- pick the first error message and report it
1187 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1188 -- while the other is "X is not in scope",
1189 -- we definitely want the former; but we might pick the latter
1190 do { addMessages (head errs_s) ; failM }
1191 else -- Add deprecation warnings
1192 mapM_ addMessages warns_s ;
1197 tcRnRecoverDataCon :: HscEnv -> a -> IO (Maybe DataCon)
1198 tcRnRecoverDataCon hsc_env a
1199 = initTcPrintErrors hsc_env iNTERACTIVE $
1200 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1201 do name <- recoverDataCon a
1202 tcLookupDataCon name
1204 tcRnLookupName :: HscEnv -> Name -> IO (Maybe TyThing)
1205 tcRnLookupName hsc_env name
1206 = initTcPrintErrors hsc_env iNTERACTIVE $
1207 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1211 tcRnGetInfo :: HscEnv
1213 -> IO (Maybe (TyThing, Fixity, [Instance]))
1215 -- Used to implemnent :info in GHCi
1217 -- Look up a RdrName and return all the TyThings it might be
1218 -- A capitalised RdrName is given to us in the DataName namespace,
1219 -- but we want to treat it as *both* a data constructor
1220 -- *and* as a type or class constructor;
1221 -- hence the call to dataTcOccs, and we return up to two results
1222 tcRnGetInfo hsc_env name
1223 = initTcPrintErrors hsc_env iNTERACTIVE $
1224 let ictxt = hsc_IC hsc_env in
1225 setInteractiveContext hsc_env ictxt $ do
1227 -- Load the interface for all unqualified types and classes
1228 -- That way we will find all the instance declarations
1229 -- (Packages have not orphan modules, and we assume that
1230 -- in the home package all relevant modules are loaded.)
1231 loadUnqualIfaces ictxt
1233 thing <- tcLookupGlobal name
1234 fixity <- lookupFixityRn name
1235 ispecs <- lookupInsts (icPrintUnqual ictxt) thing
1236 return (thing, fixity, ispecs)
1238 lookupInsts :: PrintUnqualified -> TyThing -> TcM [Instance]
1239 -- Filter the instances by the ones whose tycons (or clases resp)
1240 -- are in scope unqualified. Otherwise we list a whole lot too many!
1241 lookupInsts print_unqual (AClass cls)
1242 = do { inst_envs <- tcGetInstEnvs
1244 | ispec <- classInstances inst_envs cls
1245 , plausibleDFun print_unqual (instanceDFunId ispec) ] }
1247 lookupInsts print_unqual (ATyCon tc)
1248 = do { eps <- getEps -- Load all instances for all classes that are
1249 -- in the type environment (which are all the ones
1250 -- we've seen in any interface file so far)
1251 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1253 | ispec <- instEnvElts home_ie ++ instEnvElts pkg_ie
1254 , let dfun = instanceDFunId ispec
1256 , plausibleDFun print_unqual dfun ] }
1258 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1259 tc_name = tyConName tc
1261 lookupInsts print_unqual other = return []
1263 plausibleDFun print_unqual dfun -- Dfun involving only names that print unqualified
1264 = all ok (nameSetToList (tyClsNamesOfType (idType dfun)))
1266 ok name | isBuiltInSyntax name = True
1267 | isExternalName name =
1268 isNothing $ fst print_unqual (nameModule name)
1272 loadUnqualIfaces :: InteractiveContext -> TcM ()
1273 -- Load the home module for everything that is in scope unqualified
1274 -- This is so that we can accurately report the instances for
1276 loadUnqualIfaces ictxt
1278 mapM_ (loadSysInterface doc) (moduleSetElts (mkModuleSet unqual_mods))
1280 unqual_mods = [ nameModule name
1281 | gre <- globalRdrEnvElts (ic_rn_gbl_env ictxt),
1282 let name = gre_name gre,
1283 not (isInternalName name),
1284 isTcOcc (nameOccName name), -- Types and classes only
1285 unQualOK gre ] -- In scope unqualified
1286 doc = ptext SLIT("Need interface for module whose export(s) are in scope unqualified")
1290 %************************************************************************
1294 %************************************************************************
1297 rnDump :: SDoc -> TcRn ()
1298 -- Dump, with a banner, if -ddump-rn
1299 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1301 tcDump :: TcGblEnv -> TcRn ()
1303 = do { dflags <- getDOpts ;
1305 -- Dump short output if -ddump-types or -ddump-tc
1306 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1307 (dumpTcRn short_dump) ;
1309 -- Dump bindings if -ddump-tc
1310 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1313 short_dump = pprTcGblEnv env
1314 full_dump = pprLHsBinds (tcg_binds env)
1315 -- NB: foreign x-d's have undefined's in their types;
1316 -- hence can't show the tc_fords
1319 = do { dflags <- getDOpts ;
1320 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1321 (dumpTcRn (pprModGuts mod_guts)) ;
1323 -- Dump bindings if -ddump-tc
1324 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1326 full_dump = pprCoreBindings (mg_binds mod_guts)
1328 -- It's unpleasant having both pprModGuts and pprModDetails here
1329 pprTcGblEnv :: TcGblEnv -> SDoc
1330 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1332 tcg_fam_insts = fam_insts,
1334 tcg_imports = imports })
1335 = vcat [ ppr_types insts type_env
1336 , ppr_tycons fam_insts type_env
1338 , ppr_fam_insts fam_insts
1339 , vcat (map ppr rules)
1340 , ppr_gen_tycons (typeEnvTyCons type_env)
1341 , ptext SLIT("Dependent modules:") <+> ppr (eltsUFM (imp_dep_mods imports))
1342 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1344 pprModGuts :: ModGuts -> SDoc
1345 pprModGuts (ModGuts { mg_types = type_env,
1347 = vcat [ ppr_types [] type_env,
1350 ppr_types :: [Instance] -> TypeEnv -> SDoc
1351 ppr_types insts type_env
1352 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1354 dfun_ids = map instanceDFunId insts
1355 ids = [id | id <- typeEnvIds type_env, want_sig id]
1356 want_sig id | opt_PprStyle_Debug = True
1357 | otherwise = isLocalId id &&
1358 isExternalName (idName id) &&
1359 not (id `elem` dfun_ids)
1360 -- isLocalId ignores data constructors, records selectors etc.
1361 -- The isExternalName ignores local dictionary and method bindings
1362 -- that the type checker has invented. Top-level user-defined things
1363 -- have External names.
1365 ppr_tycons :: [FamInst] -> TypeEnv -> SDoc
1366 ppr_tycons fam_insts type_env
1367 = text "TYPE CONSTRUCTORS" $$ nest 4 (ppr_tydecls tycons)
1369 fi_tycons = map famInstTyCon fam_insts
1370 tycons = [tycon | tycon <- typeEnvTyCons type_env, want_tycon tycon]
1371 want_tycon tycon | opt_PprStyle_Debug = True
1372 | otherwise = not (isImplicitTyCon tycon) &&
1373 isExternalName (tyConName tycon) &&
1374 not (tycon `elem` fi_tycons)
1376 ppr_insts :: [Instance] -> SDoc
1377 ppr_insts [] = empty
1378 ppr_insts ispecs = text "INSTANCES" $$ nest 2 (pprInstances ispecs)
1380 ppr_fam_insts :: [FamInst] -> SDoc
1381 ppr_fam_insts [] = empty
1382 ppr_fam_insts fam_insts =
1383 text "FAMILY INSTANCES" $$ nest 2 (pprFamInsts fam_insts)
1385 ppr_sigs :: [Var] -> SDoc
1387 -- Print type signatures; sort by OccName
1388 = vcat (map ppr_sig (sortLe le_sig ids))
1390 le_sig id1 id2 = getOccName id1 <= getOccName id2
1391 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1393 ppr_tydecls :: [TyCon] -> SDoc
1395 -- Print type constructor info; sort by OccName
1396 = vcat (map ppr_tycon (sortLe le_sig tycons))
1398 le_sig tycon1 tycon2 = getOccName tycon1 <= getOccName tycon2
1400 | isCoercionTyCon tycon = ptext SLIT("coercion") <+> ppr tycon
1401 | otherwise = ppr (tyThingToIfaceDecl (ATyCon tycon))
1403 ppr_rules :: [CoreRule] -> SDoc
1404 ppr_rules [] = empty
1405 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1406 nest 4 (pprRules rs),
1409 ppr_gen_tycons [] = empty
1410 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1411 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]