7 #include "HsVersions.h"
9 import HsSyn ( MonoBinds(..) )
10 import HscTypes ( HscEnv(..), PersistentCompilerState(..),
11 emptyFixityEnv, emptyGlobalRdrEnv, TyThing,
12 ExternalPackageState(..), HomePackageTable,
13 ModDetails(..), HomeModInfo(..), Deprecations(..),
14 GlobalRdrEnv, LocalRdrEnv, NameCache, FixityEnv,
15 GhciMode, lookupType, unQualInScope )
17 import Module ( Module, moduleName, unitModuleEnv, foldModuleEnv )
18 import Name ( Name, isInternalName )
20 import NameEnv ( extendNameEnvList )
21 import InstEnv ( InstEnv, extendInstEnv )
22 import TysWiredIn ( integerTy, doubleTy )
24 import VarSet ( emptyVarSet )
25 import VarEnv ( TidyEnv, emptyTidyEnv )
26 import RdrName ( emptyRdrEnv )
27 import ErrUtils ( Message, Messages, emptyMessages, errorsFound,
28 addShortErrLocLine, addShortWarnLocLine, printErrorsAndWarnings )
29 import SrcLoc ( SrcLoc, noSrcLoc )
30 import NameEnv ( emptyNameEnv )
31 import Bag ( emptyBag )
33 import UniqSupply ( UniqSupply, mkSplitUniqSupply, uniqFromSupply, splitUniqSupply )
34 import Unique ( Unique )
35 import CmdLineOpts ( DynFlags, DynFlag(..), dopt, opt_PprStyle_Debug )
36 import BasicTypes ( FixitySig )
37 import Bag ( snocBag, unionBags )
39 import Maybe ( isJust )
41 import DATA_IOREF ( newIORef, readIORef )
44 %************************************************************************
46 Standard combinators, but specialised for this monad
49 6%************************************************************************
52 mappM :: (a -> TcRn m b) -> [a] -> TcRn m [b]
53 mappM_ :: (a -> TcRn m b) -> [a] -> TcRn m ()
54 -- Funny names to avoid clash with Prelude
55 sequenceM :: [TcRn m a] -> TcRn m [a]
56 foldlM :: (a -> b -> TcRn m a) -> a -> [b] -> TcRn m a
57 mapAndUnzipM :: (a -> TcRn m (b,c)) -> [a] -> TcRn m ([b],[c])
58 mapAndUnzip3M :: (a -> TcRn m (b,c,d)) -> [a] -> TcRn m ([b],[c],[d])
59 checkM :: Bool -> TcRn m () -> TcRn m () -- Perform arg if bool is False
60 ifM :: Bool -> TcRn m () -> TcRn m () -- Perform arg if bool is True
62 mappM f [] = return []
63 mappM f (x:xs) = do { r <- f x; rs <- mappM f xs; return (r:rs) }
65 mappM_ f [] = return ()
66 mappM_ f (x:xs) = f x >> mappM_ f xs
68 sequenceM [] = return []
69 sequenceM (x:xs) = do { r <- x; rs <- sequenceM xs; return (r:rs) }
71 foldlM k z [] = return z
72 foldlM k z (x:xs) = do { r <- k z x; foldlM k r xs }
74 mapAndUnzipM f [] = return ([],[])
75 mapAndUnzipM f (x:xs) = do { (r,s) <- f x;
76 (rs,ss) <- mapAndUnzipM f xs;
79 mapAndUnzip3M f [] = return ([],[], [])
80 mapAndUnzip3M f (x:xs) = do { (r,s,t) <- f x;
81 (rs,ss,ts) <- mapAndUnzip3M f xs;
82 return (r:rs, s:ss, t:ts) }
84 checkM True err = return ()
85 checkM False err = err
87 ifM True do_it = do_it
88 ifM False do_it = return ()
92 %************************************************************************
96 %************************************************************************
99 initTc :: HscEnv -> PersistentCompilerState
102 -> IO (PersistentCompilerState, Maybe r)
103 -- Nothing => error thrown by the thing inside
104 -- (error messages should have been printed already)
106 initTc (HscEnv { hsc_mode = ghci_mode,
108 hsc_dflags = dflags })
110 = do { us <- mkSplitUniqSupply 'a' ;
111 us_var <- newIORef us ;
112 errs_var <- newIORef (emptyBag, emptyBag) ;
113 tvs_var <- newIORef emptyVarSet ;
114 usg_var <- newIORef emptyUsages ;
115 nc_var <- newIORef (pcs_nc pcs) ;
116 eps_var <- newIORef eps ;
119 env = Env { env_top = top_env,
122 env_loc = noSrcLoc } ;
125 top_mode = ghci_mode,
131 top_errs = errs_var } ;
135 tcg_usages = usg_var,
136 tcg_rdr_env = emptyGlobalRdrEnv,
137 tcg_fix_env = emptyFixityEnv,
138 tcg_default = defaultDefaultTys,
139 tcg_type_env = emptyNameEnv,
140 tcg_ist = mkImpTypeEnv eps hpt,
141 tcg_inst_env = mkImpInstEnv dflags eps hpt,
143 tcg_imports = init_imports,
144 tcg_binds = EmptyMonoBinds,
145 tcg_deprecs = NoDeprecs,
152 tcl_level = topStage,
153 tcl_env = emptyNameEnv,
154 tcl_tyvars = tvs_var,
155 tcl_lie = panic "initTc:LIE" } ;
156 -- LIE only valid inside a getLIE
159 -- OK, here's the business end!
160 maybe_res <- catch (do { res <- runTcRn env do_this ;
162 (\_ -> return Nothing) ;
164 -- Print any error messages
165 msgs <- readIORef errs_var ;
166 printErrorsAndWarnings msgs ;
168 -- Get final PCS and return
169 eps' <- readIORef eps_var ;
170 nc' <- readIORef nc_var ;
171 let { pcs' = PCS { pcs_EPS = eps', pcs_nc = nc' } ;
172 final_res | errorsFound dflags msgs = Nothing
173 | otherwise = maybe_res } ;
175 return (pcs', final_res)
180 init_imports = emptyImportAvails { imp_qual = unitModuleEnv mod emptyAvailEnv }
181 -- Initialise tcg_imports with an empty set of bindings for
182 -- this module, so that if we see 'module M' in the export
183 -- list, and there are no bindings in M, we don't bleat
184 -- "unknown module M".
186 defaultDefaultTys :: [Type]
187 defaultDefaultTys = [integerTy, doubleTy]
189 mkImpInstEnv :: DynFlags -> ExternalPackageState -> HomePackageTable -> InstEnv
190 mkImpInstEnv dflags eps hpt
191 = foldModuleEnv (add . md_insts . hm_details)
195 -- We shouldn't get instance conflict errors from
196 -- the package and home type envs
197 add dfuns inst_env = WARN( not (null errs), vcat (map snd errs) ) inst_env'
199 (inst_env', errs) = extendInstEnv dflags inst_env dfuns
201 -- mkImpTypeEnv makes the imported symbol table
202 mkImpTypeEnv :: ExternalPackageState -> HomePackageTable
203 -> Name -> Maybe TyThing
204 mkImpTypeEnv pcs hpt = lookup
207 lookup name | isInternalName name = Nothing
208 | otherwise = lookupType hpt pte name
212 %************************************************************************
216 %************************************************************************
219 getTopEnv :: TcRn m TopEnv
220 getTopEnv = do { env <- getEnv; return (env_top env) }
222 getGblEnv :: TcRn m TcGblEnv
223 getGblEnv = do { env <- getEnv; return (env_gbl env) }
225 updGblEnv :: (TcGblEnv -> TcGblEnv) -> TcRn m a -> TcRn m a
226 updGblEnv upd = updEnv (\ env@(Env { env_gbl = gbl }) ->
227 env { env_gbl = upd gbl })
229 setGblEnv :: TcGblEnv -> TcRn m a -> TcRn m a
230 setGblEnv gbl_env = updEnv (\ env -> env { env_gbl = gbl_env })
232 getLclEnv :: TcRn m m
233 getLclEnv = do { env <- getEnv; return (env_lcl env) }
235 updLclEnv :: (m -> m) -> TcRn m a -> TcRn m a
236 updLclEnv upd = updEnv (\ env@(Env { env_lcl = lcl }) ->
237 env { env_lcl = upd lcl })
239 setLclEnv :: m -> TcRn m a -> TcRn n a
240 setLclEnv lcl_env = updEnv (\ env -> env { env_lcl = lcl_env })
246 getDOpts :: TcRn m DynFlags
247 getDOpts = do { env <- getTopEnv; return (top_dflags env) }
249 doptM :: DynFlag -> TcRn m Bool
250 doptM flag = do { dflags <- getDOpts; return (dopt flag dflags) }
252 ifOptM :: DynFlag -> TcRn m () -> TcRn m () -- Do it flag is true
253 ifOptM flag thing_inside = do { b <- doptM flag;
254 if b then thing_inside else return () }
256 getGhciMode :: TcRn m GhciMode
257 getGhciMode = do { env <- getTopEnv; return (top_mode env) }
261 getSrcLocM :: TcRn m SrcLoc
262 -- Avoid clash with Name.getSrcLoc
263 getSrcLocM = do { env <- getEnv; return (env_loc env) }
265 addSrcLoc :: SrcLoc -> TcRn m a -> TcRn m a
266 addSrcLoc loc = updEnv (\env -> env { env_loc = loc })
270 getEps :: TcRn m ExternalPackageState
271 getEps = do { env <- getTopEnv; readMutVar (top_eps env) }
273 setEps :: ExternalPackageState -> TcRn m ()
274 setEps eps = do { env <- getTopEnv; writeMutVar (top_eps env) eps }
276 getHpt :: TcRn m HomePackageTable
277 getHpt = do { env <- getTopEnv; return (top_hpt env) }
279 getModule :: TcRn m Module
280 getModule = do { env <- getGblEnv; return (tcg_mod env) }
282 getGlobalRdrEnv :: TcRn m GlobalRdrEnv
283 getGlobalRdrEnv = do { env <- getGblEnv; return (tcg_rdr_env env) }
285 getImports :: TcRn m ImportAvails
286 getImports = do { env <- getGblEnv; return (tcg_imports env) }
288 getFixityEnv :: TcRn m FixityEnv
289 getFixityEnv = do { env <- getGblEnv; return (tcg_fix_env env) }
291 extendFixityEnv :: [(Name,FixitySig Name)] -> RnM a -> RnM a
292 extendFixityEnv new_bit
293 = updGblEnv (\env@(TcGblEnv { tcg_fix_env = old_fix_env }) ->
294 env {tcg_fix_env = extendNameEnvList old_fix_env new_bit})
296 getDefaultTys :: TcRn m [Type]
297 getDefaultTys = do { env <- getGblEnv; return (tcg_default env) }
301 getUsageVar :: TcRn m (TcRef EntityUsage)
302 getUsageVar = do { env <- getGblEnv; return (tcg_usages env) }
304 getUsages :: TcRn m EntityUsage
305 getUsages = do { usg_var <- getUsageVar; readMutVar usg_var }
307 updUsages :: (EntityUsage -> EntityUsage) -> TcRn m ()
308 updUsages upd = do { usg_var <- getUsageVar ;
309 usg <- readMutVar usg_var ;
310 writeMutVar usg_var (upd usg) }
314 %************************************************************************
318 %************************************************************************
321 getErrsVar :: TcRn m (TcRef Messages)
322 getErrsVar = do { env <- getTopEnv; return (top_errs env) }
324 setErrsVar :: TcRef Messages -> TcRn m a -> TcRn m a
325 setErrsVar v = updEnv (\ env@(Env { env_top = top_env }) ->
326 env { env_top = top_env { top_errs = v }})
328 addErr :: Message -> TcRn m ()
329 addErr msg = do { loc <- getSrcLocM ; addErrAt loc msg }
331 addErrAt :: SrcLoc -> Message -> TcRn m ()
333 = do { errs_var <- getErrsVar ;
334 rdr_env <- getGlobalRdrEnv ;
335 let { err = addShortErrLocLine loc (unQualInScope rdr_env) msg } ;
336 (warns, errs) <- readMutVar errs_var ;
337 writeMutVar errs_var (warns, errs `snocBag` err) }
339 addErrs :: [(SrcLoc,Message)] -> TcRn m ()
340 addErrs msgs = mappM_ add msgs
342 add (loc,msg) = addErrAt loc msg
344 addWarn :: Message -> TcRn m ()
346 = do { errs_var <- getErrsVar ;
348 rdr_env <- getGlobalRdrEnv ;
349 let { warn = addShortWarnLocLine loc (unQualInScope rdr_env) msg } ;
350 (warns, errs) <- readMutVar errs_var ;
351 writeMutVar errs_var (warns `snocBag` warn, errs) }
353 checkErr :: Bool -> Message -> TcRn m ()
354 -- Add the error if the bool is False
355 checkErr ok msg = checkM ok (addErr msg)
357 warnIf :: Bool -> Message -> TcRn m ()
358 warnIf True msg = addWarn msg
359 warnIf False msg = return ()
361 addMessages :: Messages -> TcRn m ()
362 addMessages (m_warns, m_errs)
363 = do { errs_var <- getErrsVar ;
364 (warns, errs) <- readMutVar errs_var ;
365 writeMutVar errs_var (warns `unionBags` m_warns,
366 errs `unionBags` m_errs) }
368 checkGHCI :: Message -> TcRn m () -- Check that GHCI is on
369 -- otherwise add the error message
371 checkGHCI m = returnM ()
373 checkGHCI m = addErr m
379 recoverM :: TcRn m r -- Recovery action; do this if the main one fails
380 -> TcRn m r -- Main action: do this first
382 recoverM recover thing
383 = do { mb_res <- tryM thing ;
386 Right res -> returnM res }
388 tryTc :: TcRn m a -> TcRn m (Messages, Maybe a)
389 -- (tryTc m) executes m, and returns
390 -- Just r, if m succeeds (returning r) and caused no errors
391 -- Nothing, if m fails, or caused errors
392 -- It also returns all the errors accumulated by m
393 -- (even in the Just case, there might be warnings)
395 -- It always succeeds (never raises an exception)
397 = do { errs_var <- newMutVar emptyMessages ;
399 mb_r <- tryM (setErrsVar errs_var m) ;
401 new_errs <- readMutVar errs_var ;
408 Right r | errorsFound dflags new_errs -> Nothing
409 | otherwise -> Just r)
412 tryTcLIE :: TcM a -> TcM (Messages, Maybe a)
413 -- Just like tryTc, except that it ensures that the LIE
414 -- for the thing is propagated only if there are no errors
415 -- Hence it's restricted to the type-check monad
416 tryTcLIE thing_inside
417 = do { ((errs, mb_r), lie) <- getLIE (tryTc thing_inside) ;
418 ifM (isJust mb_r) (extendLIEs lie) ;
419 return (errs, mb_r) }
421 tryTcLIE_ :: TcM r -> TcM r -> TcM r
422 -- (tryM_ r m) tries m; if it succeeds it returns it,
423 -- otherwise it returns r. Any error messages added by m are discarded,
424 -- whether or not m succeeds.
425 tryTcLIE_ recover main
426 = do { (_msgs, mb_res) <- tryTcLIE main ;
428 Just res -> return res
431 checkNoErrs :: TcM r -> TcM r
432 -- (checkNoErrs m) succeeds iff m succeeds and generates no errors
433 -- If m fails then (checkNoErrsTc m) fails.
434 -- If m succeeds, it checks whether m generated any errors messages
435 -- (it might have recovered internally)
436 -- If so, it fails too.
437 -- Regardless, any errors generated by m are propagated to the enclosing context.
439 = do { (msgs, mb_res) <- tryTcLIE main ;
446 ifErrsM :: TcRn m r -> TcRn m r -> TcRn m r
447 -- ifErrsM bale_out main
448 -- does 'bale_out' if there are errors in errors collection
449 -- otherwise does 'main'
450 ifErrsM bale_out normal
451 = do { errs_var <- getErrsVar ;
452 msgs <- readMutVar errs_var ;
454 if errorsFound dflags msgs then
459 failIfErrsM :: TcRn m ()
460 -- Useful to avoid error cascades
461 failIfErrsM = ifErrsM failM (return ())
465 forkM :: SDoc -> TcM a -> TcM (Maybe a)
466 -- Run thing_inside in an interleaved thread. It gets a separate
469 -- but everything else is shared, so this is DANGEROUS.
471 -- It returns Nothing if the computation fails
473 -- It's used for lazily type-checking interface
474 -- signatures, which is pretty benign
476 forkM doc thing_inside
477 = do { us <- newUniqueSupply ;
479 do { us_var <- newMutVar us ;
480 (msgs, mb_res) <- tryTcLIE (setUsVar us_var thing_inside) ;
482 Just r -> return (Just r)
484 -- Bleat about errors in the forked thread
485 ioToTcRn (do { printErrs (hdr_doc defaultErrStyle) ;
486 printErrorsAndWarnings msgs }) ;
490 hdr_doc = text "forkM failed:" <+> doc
494 %************************************************************************
498 %************************************************************************
501 getUsVar :: TcRn m (TcRef UniqSupply)
502 getUsVar = do { env <- getTopEnv; return (top_us env) }
504 setUsVar :: TcRef UniqSupply -> TcRn m a -> TcRn m a
505 setUsVar v = updEnv (\ env@(Env { env_top = top_env }) ->
506 env { env_top = top_env { top_us = v }})
508 newUnique :: TcRn m Unique
509 newUnique = do { us <- newUniqueSupply ;
510 return (uniqFromSupply us) }
512 newUniqueSupply :: TcRn m UniqSupply
514 = do { u_var <- getUsVar ;
515 us <- readMutVar u_var ;
516 let { (us1, us2) = splitUniqSupply us } ;
517 writeMutVar u_var us1 ;
523 getNameCache :: TcRn m NameCache
524 getNameCache = do { TopEnv { top_nc = nc_var } <- getTopEnv;
527 setNameCache :: NameCache -> TcRn m ()
528 setNameCache nc = do { TopEnv { top_nc = nc_var } <- getTopEnv;
529 writeMutVar nc_var nc }
533 %************************************************************************
537 %************************************************************************
540 traceTc, traceRn :: SDoc -> TcRn a ()
541 traceRn = dumpOptTcRn Opt_D_dump_rn_trace
542 traceTc = dumpOptTcRn Opt_D_dump_tc_trace
543 traceSplice = dumpOptTcRn Opt_D_dump_splices
544 traceHiDiffs = dumpOptTcRn Opt_D_dump_hi_diffs
546 dumpOptTcRn :: DynFlag -> SDoc -> TcRn a ()
547 dumpOptTcRn flag doc = ifOptM flag (dumpTcRn doc)
549 dumpTcRn :: SDoc -> TcRn a ()
550 dumpTcRn doc = do { rdr_env <- getGlobalRdrEnv ;
551 ioToTcRn (printForUser stderr (unQualInScope rdr_env) doc) }
555 %************************************************************************
557 Context management and error message generation
560 %************************************************************************
563 setErrCtxtM, addErrCtxtM :: (TidyEnv -> TcM (TidyEnv, Message)) -> TcM a -> TcM a
564 setErrCtxtM msg = updCtxt (\ msgs -> [msg])
565 addErrCtxtM msg = updCtxt (\ msgs -> msg : msgs)
567 setErrCtxt, addErrCtxt :: Message -> TcM a -> TcM a
568 setErrCtxt msg = setErrCtxtM (\env -> returnM (env, msg))
569 addErrCtxt msg = addErrCtxtM (\env -> returnM (env, msg))
571 popErrCtxt :: TcM a -> TcM a
572 popErrCtxt = updCtxt (\ msgs -> case msgs of { [] -> []; (m:ms) -> ms })
574 getErrCtxt :: TcM ErrCtxt
575 getErrCtxt = do { env <- getLclEnv ; return (tcl_ctxt env) }
577 -- Helper function for the above
578 updCtxt :: (ErrCtxt -> ErrCtxt) -> TcM a -> TcM a
579 updCtxt upd = updLclEnv (\ env@(TcLclEnv { tcl_ctxt = ctxt }) ->
580 env { tcl_ctxt = upd ctxt })
582 getInstLoc :: InstOrigin -> TcM InstLoc
584 = do { loc <- getSrcLocM ; env <- getLclEnv ;
585 return (origin, loc, (tcl_ctxt env)) }
588 The addErrTc functions add an error message, but do not cause failure.
589 The 'M' variants pass a TidyEnv that has already been used to
590 tidy up the message; we then use it to tidy the context messages
593 addErrTc :: Message -> TcM ()
594 addErrTc err_msg = addErrTcM (emptyTidyEnv, err_msg)
596 addErrsTc :: [Message] -> TcM ()
597 addErrsTc err_msgs = mappM_ addErrTc err_msgs
599 addErrTcM :: (TidyEnv, Message) -> TcM ()
600 addErrTcM (tidy_env, err_msg)
601 = do { ctxt <- getErrCtxt ;
603 add_err_tcm tidy_env err_msg loc ctxt }
605 addInstErrTcM :: InstLoc -> (TidyEnv, Message) -> TcM ()
606 addInstErrTcM inst_loc@(_, loc, ctxt) (tidy_env, err_msg)
607 = add_err_tcm tidy_env err_msg loc full_ctxt
609 full_ctxt = (\env -> returnM (env, pprInstLoc inst_loc)) : ctxt
612 The failWith functions add an error message and cause failure
615 failWithTc :: Message -> TcM a -- Add an error message and fail
617 = addErrTc err_msg >> failM
619 failWithTcM :: (TidyEnv, Message) -> TcM a -- Add an error message and fail
620 failWithTcM local_and_msg
621 = addErrTcM local_and_msg >> failM
623 checkTc :: Bool -> Message -> TcM () -- Check that the boolean is true
624 checkTc True err = returnM ()
625 checkTc False err = failWithTc err
628 Warnings have no 'M' variant, nor failure
631 addWarnTc :: Message -> TcM ()
633 = do { ctxt <- getErrCtxt ;
634 ctxt_msgs <- do_ctxt emptyTidyEnv ctxt ;
635 addWarn (vcat (msg : ctxt_to_use ctxt_msgs)) }
637 warnTc :: Bool -> Message -> TcM ()
638 warnTc warn_if_true warn_msg
639 | warn_if_true = addWarnTc warn_msg
640 | otherwise = return ()
646 add_err_tcm tidy_env err_msg loc ctxt
647 = do { ctxt_msgs <- do_ctxt tidy_env ctxt ;
648 addErrAt loc (vcat (err_msg : ctxt_to_use ctxt_msgs)) }
652 do_ctxt tidy_env (c:cs)
653 = do { (tidy_env', m) <- c tidy_env ;
654 ms <- do_ctxt tidy_env' cs ;
657 ctxt_to_use ctxt | opt_PprStyle_Debug = ctxt
658 | otherwise = take 3 ctxt
661 %************************************************************************
663 Other stuff specific to type checker
665 %************************************************************************
668 getLIEVar :: TcM (TcRef LIE)
669 getLIEVar = do { env <- getLclEnv; return (tcl_lie env) }
671 setLIEVar :: TcRef LIE -> TcM a -> TcM a
672 setLIEVar lie_var = updLclEnv (\ env -> env { tcl_lie = lie_var })
674 getLIE :: TcM a -> TcM (a, [Inst])
675 -- (getLIE m) runs m, and returns the type constraints it generates
677 = do { lie_var <- newMutVar emptyLIE ;
678 res <- updLclEnv (\ env -> env { tcl_lie = lie_var })
680 lie <- readMutVar lie_var ;
681 return (res, lieToList lie) }
683 extendLIE :: Inst -> TcM ()
685 = do { lie_var <- getLIEVar ;
686 lie <- readMutVar lie_var ;
687 writeMutVar lie_var (inst `consLIE` lie) }
689 extendLIEs :: [Inst] -> TcM ()
693 = do { lie_var <- getLIEVar ;
694 lie <- readMutVar lie_var ;
695 writeMutVar lie_var (mkLIE insts `plusLIE` lie) }
700 getStage :: TcM Stage
701 getStage = do { env <- getLclEnv; return (tcl_level env) }
703 setStage :: Stage -> TcM a -> TcM a
704 setStage s = updLclEnv (\ env -> env { tcl_level = s })
706 setLclTypeEnv :: TcLclEnv -> TcM a -> TcM a
707 -- Set the local type envt, but do *not* disturb other fields,
708 -- notably the lie_var
709 setLclTypeEnv lcl_env thing_inside
710 = updLclEnv upd thing_inside
712 upd env = env { tcl_env = tcl_env lcl_env,
713 tcl_tyvars = tcl_tyvars lcl_env }
717 %************************************************************************
719 Stuff for the renamer's local env
721 %************************************************************************
724 initRn :: RnMode -> RnM a -> TcRn m a
725 initRn mode thing_inside
726 = do { env <- getGblEnv ;
727 let { lcl_env = RnLclEnv {
729 rn_lenv = emptyRdrEnv }} ;
730 setLclEnv lcl_env thing_inside }
734 getLocalRdrEnv :: RnM LocalRdrEnv
735 getLocalRdrEnv = do { env <- getLclEnv; return (rn_lenv env) }
737 setLocalRdrEnv :: LocalRdrEnv -> RnM a -> RnM a
738 setLocalRdrEnv rdr_env thing_inside
739 = updLclEnv (\env -> env {rn_lenv = rdr_env}) thing_inside
741 getModeRn :: RnM RnMode
742 getModeRn = do { env <- getLclEnv; return (rn_mode env) }