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 msgs = Nothing
173 | otherwise = maybe_res } ;
175 return (pcs', final_res)
180 init_imports = emptyImportAvails { imp_unqual = 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 ;
406 Right r | errorsFound new_errs -> Nothing
407 | otherwise -> Just r)
410 tryTcLIE :: TcM a -> TcM (Messages, Maybe a)
411 -- Just like tryTc, except that it ensures that the LIE
412 -- for the thing is propagated only if there are no errors
413 -- Hence it's restricted to the type-check monad
414 tryTcLIE thing_inside
415 = do { ((errs, mb_r), lie) <- getLIE (tryTc thing_inside) ;
416 ifM (isJust mb_r) (extendLIEs lie) ;
417 return (errs, mb_r) }
419 tryTcLIE_ :: TcM r -> TcM r -> TcM r
420 -- (tryM_ r m) tries m; if it succeeds it returns it,
421 -- otherwise it returns r. Any error messages added by m are discarded,
422 -- whether or not m succeeds.
423 tryTcLIE_ recover main
424 = do { (_msgs, mb_res) <- tryTcLIE main ;
426 Just res -> return res
429 checkNoErrs :: TcM r -> TcM r
430 -- (checkNoErrs m) succeeds iff m succeeds and generates no errors
431 -- If m fails then (checkNoErrsTc m) fails.
432 -- If m succeeds, it checks whether m generated any errors messages
433 -- (it might have recovered internally)
434 -- If so, it fails too.
435 -- Regardless, any errors generated by m are propagated to the enclosing context.
437 = do { (msgs, mb_res) <- tryTcLIE main ;
444 ifErrsM :: TcRn m r -> TcRn m r -> TcRn m r
445 -- ifErrsM bale_out main
446 -- does 'bale_out' if there are errors in errors collection
447 -- otherwise does 'main'
448 ifErrsM bale_out normal
449 = do { errs_var <- getErrsVar ;
450 msgs <- readMutVar errs_var ;
451 if errorsFound msgs then
456 failIfErrsM :: TcRn m ()
457 -- Useful to avoid error cascades
458 failIfErrsM = ifErrsM failM (return ())
462 forkM :: SDoc -> TcM a -> TcM (Maybe a)
463 -- Run thing_inside in an interleaved thread. It gets a separate
466 -- but everything else is shared, so this is DANGEROUS.
468 -- It returns Nothing if the computation fails
470 -- It's used for lazily type-checking interface
471 -- signatures, which is pretty benign
473 forkM doc thing_inside
474 = do { us <- newUniqueSupply ;
476 do { us_var <- newMutVar us ;
477 (msgs, mb_res) <- tryTcLIE (setUsVar us_var thing_inside) ;
479 Just r -> return (Just r)
481 -- Bleat about errors in the forked thread
482 ioToTcRn (do { printErrs (hdr_doc defaultErrStyle) ;
483 printErrorsAndWarnings msgs }) ;
487 hdr_doc = text "forkM failed:" <+> doc
491 %************************************************************************
495 %************************************************************************
498 getUsVar :: TcRn m (TcRef UniqSupply)
499 getUsVar = do { env <- getTopEnv; return (top_us env) }
501 setUsVar :: TcRef UniqSupply -> TcRn m a -> TcRn m a
502 setUsVar v = updEnv (\ env@(Env { env_top = top_env }) ->
503 env { env_top = top_env { top_us = v }})
505 newUnique :: TcRn m Unique
506 newUnique = do { us <- newUniqueSupply ;
507 return (uniqFromSupply us) }
509 newUniqueSupply :: TcRn m UniqSupply
511 = do { u_var <- getUsVar ;
512 us <- readMutVar u_var ;
513 let { (us1, us2) = splitUniqSupply us } ;
514 writeMutVar u_var us1 ;
520 getNameCache :: TcRn m NameCache
521 getNameCache = do { TopEnv { top_nc = nc_var } <- getTopEnv;
524 setNameCache :: NameCache -> TcRn m ()
525 setNameCache nc = do { TopEnv { top_nc = nc_var } <- getTopEnv;
526 writeMutVar nc_var nc }
530 %************************************************************************
534 %************************************************************************
537 traceTc, traceRn :: SDoc -> TcRn a ()
538 traceRn = dumpOptTcRn Opt_D_dump_rn_trace
539 traceTc = dumpOptTcRn Opt_D_dump_tc_trace
540 traceSplice = dumpOptTcRn Opt_D_dump_splices
541 traceHiDiffs = dumpOptTcRn Opt_D_dump_hi_diffs
543 dumpOptTcRn :: DynFlag -> SDoc -> TcRn a ()
544 dumpOptTcRn flag doc = ifOptM flag (dumpTcRn doc)
546 dumpTcRn :: SDoc -> TcRn a ()
547 dumpTcRn doc = do { rdr_env <- getGlobalRdrEnv ;
548 ioToTcRn (printForUser stderr (unQualInScope rdr_env) doc) }
552 %************************************************************************
554 Context management and error message generation
557 %************************************************************************
560 setErrCtxtM, addErrCtxtM :: (TidyEnv -> TcM (TidyEnv, Message)) -> TcM a -> TcM a
561 setErrCtxtM msg = updCtxt (\ msgs -> [msg])
562 addErrCtxtM msg = updCtxt (\ msgs -> msg : msgs)
564 setErrCtxt, addErrCtxt :: Message -> TcM a -> TcM a
565 setErrCtxt msg = setErrCtxtM (\env -> returnM (env, msg))
566 addErrCtxt msg = addErrCtxtM (\env -> returnM (env, msg))
568 popErrCtxt :: TcM a -> TcM a
569 popErrCtxt = updCtxt (\ msgs -> case msgs of { [] -> []; (m:ms) -> ms })
571 getErrCtxt :: TcM ErrCtxt
572 getErrCtxt = do { env <- getLclEnv ; return (tcl_ctxt env) }
574 -- Helper function for the above
575 updCtxt :: (ErrCtxt -> ErrCtxt) -> TcM a -> TcM a
576 updCtxt upd = updLclEnv (\ env@(TcLclEnv { tcl_ctxt = ctxt }) ->
577 env { tcl_ctxt = upd ctxt })
579 getInstLoc :: InstOrigin -> TcM InstLoc
581 = do { loc <- getSrcLocM ; env <- getLclEnv ;
582 return (origin, loc, (tcl_ctxt env)) }
585 The addErrTc functions add an error message, but do not cause failure.
586 The 'M' variants pass a TidyEnv that has already been used to
587 tidy up the message; we then use it to tidy the context messages
590 addErrTc :: Message -> TcM ()
591 addErrTc err_msg = addErrTcM (emptyTidyEnv, err_msg)
593 addErrsTc :: [Message] -> TcM ()
594 addErrsTc err_msgs = mappM_ addErrTc err_msgs
596 addErrTcM :: (TidyEnv, Message) -> TcM ()
597 addErrTcM (tidy_env, err_msg)
598 = do { ctxt <- getErrCtxt ;
600 add_err_tcm tidy_env err_msg loc ctxt }
602 addInstErrTcM :: InstLoc -> (TidyEnv, Message) -> TcM ()
603 addInstErrTcM inst_loc@(_, loc, ctxt) (tidy_env, err_msg)
604 = add_err_tcm tidy_env err_msg loc full_ctxt
606 full_ctxt = (\env -> returnM (env, pprInstLoc inst_loc)) : ctxt
609 The failWith functions add an error message and cause failure
612 failWithTc :: Message -> TcM a -- Add an error message and fail
614 = addErrTc err_msg >> failM
616 failWithTcM :: (TidyEnv, Message) -> TcM a -- Add an error message and fail
617 failWithTcM local_and_msg
618 = addErrTcM local_and_msg >> failM
620 checkTc :: Bool -> Message -> TcM () -- Check that the boolean is true
621 checkTc True err = returnM ()
622 checkTc False err = failWithTc err
625 Warnings have no 'M' variant, nor failure
628 addWarnTc :: Message -> TcM ()
630 = do { ctxt <- getErrCtxt ;
631 ctxt_msgs <- do_ctxt emptyTidyEnv ctxt ;
632 addWarn (vcat (msg : ctxt_to_use ctxt_msgs)) }
634 warnTc :: Bool -> Message -> TcM ()
635 warnTc warn_if_true warn_msg
636 | warn_if_true = addWarnTc warn_msg
637 | otherwise = return ()
643 add_err_tcm tidy_env err_msg loc ctxt
644 = do { ctxt_msgs <- do_ctxt tidy_env ctxt ;
645 addErrAt loc (vcat (err_msg : ctxt_to_use ctxt_msgs)) }
649 do_ctxt tidy_env (c:cs)
650 = do { (tidy_env', m) <- c tidy_env ;
651 ms <- do_ctxt tidy_env' cs ;
654 ctxt_to_use ctxt | opt_PprStyle_Debug = ctxt
655 | otherwise = take 3 ctxt
658 %************************************************************************
660 Other stuff specific to type checker
662 %************************************************************************
665 getLIEVar :: TcM (TcRef LIE)
666 getLIEVar = do { env <- getLclEnv; return (tcl_lie env) }
668 setLIEVar :: TcRef LIE -> TcM a -> TcM a
669 setLIEVar lie_var = updLclEnv (\ env -> env { tcl_lie = lie_var })
671 getLIE :: TcM a -> TcM (a, [Inst])
672 -- (getLIE m) runs m, and returns the type constraints it generates
674 = do { lie_var <- newMutVar emptyLIE ;
675 res <- updLclEnv (\ env -> env { tcl_lie = lie_var })
677 lie <- readMutVar lie_var ;
678 return (res, lieToList lie) }
680 extendLIE :: Inst -> TcM ()
682 = do { lie_var <- getLIEVar ;
683 lie <- readMutVar lie_var ;
684 writeMutVar lie_var (inst `consLIE` lie) }
686 extendLIEs :: [Inst] -> TcM ()
690 = do { lie_var <- getLIEVar ;
691 lie <- readMutVar lie_var ;
692 writeMutVar lie_var (mkLIE insts `plusLIE` lie) }
697 getStage :: TcM Stage
698 getStage = do { env <- getLclEnv; return (tcl_level env) }
700 setStage :: Stage -> TcM a -> TcM a
701 setStage s = updLclEnv (\ env -> env { tcl_level = s })
703 setLclTypeEnv :: TcLclEnv -> TcM a -> TcM a
704 -- Set the local type envt, but do *not* disturb other fields,
705 -- notably the lie_var
706 setLclTypeEnv lcl_env thing_inside
707 = updLclEnv upd thing_inside
709 upd env = env { tcl_env = tcl_env lcl_env,
710 tcl_tyvars = tcl_tyvars lcl_env }
714 %************************************************************************
716 Stuff for the renamer's local env
718 %************************************************************************
721 initRn :: RnMode -> RnM a -> TcRn m a
722 initRn mode thing_inside
723 = do { env <- getGblEnv ;
724 let { lcl_env = RnLclEnv {
726 rn_lenv = emptyRdrEnv }} ;
727 setLclEnv lcl_env thing_inside }
731 getLocalRdrEnv :: RnM LocalRdrEnv
732 getLocalRdrEnv = do { env <- getLclEnv; return (rn_lenv env) }
734 setLocalRdrEnv :: LocalRdrEnv -> RnM a -> RnM a
735 setLocalRdrEnv rdr_env thing_inside
736 = updLclEnv (\env -> env {rn_lenv = rdr_env}) thing_inside
738 getModeRn :: RnM RnMode
739 getModeRn = do { env <- getLclEnv; return (rn_mode env) }