2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[RnSource]{Main pass of renamer}
8 rnSrcDecls, addTcgDUs, rnTyClDecls, findSplice
11 #include "HsVersions.h"
13 import {-# SOURCE #-} RnExpr( rnLExpr )
15 import {-# SOURCE #-} TcSplice ( runQuasiQuoteDecl )
19 import RdrName ( RdrName, isRdrDataCon, elemLocalRdrEnv, rdrNameOcc )
20 import RdrHsSyn ( extractGenericPatTyVars, extractHsRhoRdrTyVars )
22 import RnTypes ( rnLHsType, rnLHsTypes, rnHsSigType, rnHsTypeFVs, rnContext, rnConDeclFields )
23 import RnBinds ( rnTopBindsLHS, rnTopBindsRHS, rnMethodBinds, renameSigs, mkSigTvFn,
25 import RnEnv ( lookupLocalDataTcNames, lookupLocatedOccRn,
26 lookupTopBndrRn, lookupLocatedTopBndrRn,
27 lookupOccRn, newLocalBndrsRn, bindLocalNamesFV,
28 bindLocatedLocalsFV, bindPatSigTyVarsFV,
29 bindTyVarsRn, bindTyVarsFV, extendTyVarEnvFVRn,
30 bindLocalNames, checkDupRdrNames, mapFvRn
32 import RnNames ( getLocalNonValBinders, extendGlobalRdrEnvRn )
33 import HscTypes ( GenAvailInfo(..), availsToNameSet )
34 import RnHsDoc ( rnHsDoc, rnMbLHsDoc )
37 import ForeignCall ( CCallTarget(..) )
39 import HscTypes ( Warnings(..), plusWarns )
40 import Class ( FunDep )
41 import Name ( Name, nameOccName )
47 import Util ( filterOut )
50 import HscTypes ( HscEnv, hsc_dflags )
51 import BasicTypes ( Boxity(..) )
52 import ListSetOps ( findDupsEq )
61 thenM :: Monad a => a b -> (b -> a c) -> a c
64 thenM_ :: Monad a => a b -> a c -> a c
68 @rnSourceDecl@ `renames' declarations.
69 It simultaneously performs dependency analysis and precedence parsing.
70 It also does the following error checks:
73 Checks that tyvars are used properly. This includes checking
74 for undefined tyvars, and tyvars in contexts that are ambiguous.
75 (Some of this checking has now been moved to module @TcMonoType@,
76 since we don't have functional dependency information at this point.)
78 Checks that all variable occurences are defined.
80 Checks the @(..)@ etc constraints in the export list.
85 -- Brings the binders of the group into scope in the appropriate places;
86 -- does NOT assume that anything is in scope already
87 rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name)
88 -- Rename a HsGroup; used for normal source files *and* hs-boot files
89 rnSrcDecls group@(HsGroup { hs_valds = val_decls,
90 hs_tyclds = tycl_decls,
91 hs_instds = inst_decls,
92 hs_derivds = deriv_decls,
94 hs_warnds = warn_decls,
96 hs_fords = foreign_decls,
97 hs_defds = default_decls,
98 hs_ruleds = rule_decls,
101 -- (A) Process the fixity declarations, creating a mapping from
102 -- FastStrings to FixItems.
103 -- Also checks for duplcates.
104 local_fix_env <- makeMiniFixityEnv fix_decls;
106 -- (B) Bring top level binders (and their fixities) into scope,
107 -- *except* for the value bindings, which get brought in below.
108 -- However *do* include class ops, data constructors
109 -- And for hs-boot files *do* include the value signatures
110 tc_avails <- getLocalNonValBinders group ;
111 tc_envs <- extendGlobalRdrEnvRn tc_avails local_fix_env ;
112 setEnvs tc_envs $ do {
114 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
116 -- (C) Extract the mapping from data constructors to field names and
117 -- extend the record field env.
118 -- This depends on the data constructors and field names being in
119 -- scope from (B) above
120 inNewEnv (extendRecordFieldEnv tycl_decls inst_decls) $ \ _ -> do {
122 -- (D) Rename the left-hand sides of the value bindings.
123 -- This depends on everything from (B) being in scope,
124 -- and on (C) for resolving record wild cards.
125 -- It uses the fixity env from (A) to bind fixities for view patterns.
126 new_lhs <- rnTopBindsLHS local_fix_env val_decls ;
127 -- bind the LHSes (and their fixities) in the global rdr environment
128 let { val_binders = collectHsValBinders new_lhs ;
129 val_bndr_set = mkNameSet val_binders ;
130 all_bndr_set = val_bndr_set `unionNameSets` availsToNameSet tc_avails ;
131 val_avails = map Avail val_binders
133 (tcg_env, tcl_env) <- extendGlobalRdrEnvRn val_avails local_fix_env ;
134 setEnvs (tcg_env, tcl_env) $ do {
136 -- Now everything is in scope, as the remaining renaming assumes.
138 -- (E) Rename type and class decls
139 -- (note that value LHSes need to be in scope for default methods)
141 -- You might think that we could build proper def/use information
142 -- for type and class declarations, but they can be involved
143 -- in mutual recursion across modules, and we only do the SCC
144 -- analysis for them in the type checker.
145 -- So we content ourselves with gathering uses only; that
146 -- means we'll only report a declaration as unused if it isn't
147 -- mentioned at all. Ah well.
148 traceRn (text "Start rnTyClDecls") ;
149 (rn_tycl_decls, src_fvs1) <- rnList rnTyClDecl tycl_decls ;
151 -- (F) Rename Value declarations right-hand sides
152 traceRn (text "Start rnmono") ;
153 (rn_val_decls, bind_dus) <- rnTopBindsRHS val_bndr_set new_lhs ;
154 traceRn (text "finish rnmono" <+> ppr rn_val_decls) ;
156 -- (G) Rename Fixity and deprecations
158 -- Rename fixity declarations and error if we try to
159 -- fix something from another module (duplicates were checked in (A))
160 rn_fix_decls <- rnSrcFixityDecls all_bndr_set fix_decls ;
162 -- Rename deprec decls;
163 -- check for duplicates and ensure that deprecated things are defined locally
164 -- at the moment, we don't keep these around past renaming
165 rn_warns <- rnSrcWarnDecls all_bndr_set warn_decls ;
167 -- (H) Rename Everything else
169 (rn_inst_decls, src_fvs2) <- rnList rnSrcInstDecl inst_decls ;
170 (rn_rule_decls, src_fvs3) <- setOptM Opt_ScopedTypeVariables $
171 rnList rnHsRuleDecl rule_decls ;
172 -- Inside RULES, scoped type variables are on
173 (rn_foreign_decls, src_fvs4) <- rnList rnHsForeignDecl foreign_decls ;
174 (rn_ann_decls, src_fvs5) <- rnList rnAnnDecl ann_decls ;
175 (rn_default_decls, src_fvs6) <- rnList rnDefaultDecl default_decls ;
176 (rn_deriv_decls, src_fvs7) <- rnList rnSrcDerivDecl deriv_decls ;
177 -- Haddock docs; no free vars
178 rn_docs <- mapM (wrapLocM rnDocDecl) docs ;
180 -- (I) Compute the results and return
181 let {rn_group = HsGroup { hs_valds = rn_val_decls,
182 hs_tyclds = rn_tycl_decls,
183 hs_instds = rn_inst_decls,
184 hs_derivds = rn_deriv_decls,
185 hs_fixds = rn_fix_decls,
186 hs_warnds = [], -- warns are returned in the tcg_env
187 -- (see below) not in the HsGroup
188 hs_fords = rn_foreign_decls,
189 hs_annds = rn_ann_decls,
190 hs_defds = rn_default_decls,
191 hs_ruleds = rn_rule_decls,
192 hs_docs = rn_docs } ;
194 tycl_bndrs = hsTyClDeclsBinders rn_tycl_decls rn_inst_decls ;
195 ford_bndrs = hsForeignDeclsBinders rn_foreign_decls ;
196 other_def = (Just (mkNameSet tycl_bndrs `unionNameSets` mkNameSet ford_bndrs), emptyNameSet) ;
197 other_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3, src_fvs4,
198 src_fvs5, src_fvs6, src_fvs7] ;
199 -- It is tiresome to gather the binders from type and class decls
201 src_dus = [other_def] `plusDU` bind_dus `plusDU` usesOnly other_fvs ;
202 -- Instance decls may have occurrences of things bound in bind_dus
203 -- so we must put other_fvs last
205 final_tcg_env = let tcg_env' = (tcg_env `addTcgDUs` src_dus)
206 in -- we return the deprecs in the env, not in the HsGroup above
207 tcg_env' { tcg_warns = tcg_warns tcg_env' `plusWarns` rn_warns };
210 traceRn (text "finish rnSrc" <+> ppr rn_group) ;
211 traceRn (text "finish Dus" <+> ppr src_dus ) ;
212 return (final_tcg_env, rn_group)
215 -- some utils because we do this a bunch above
216 -- compute and install the new env
217 inNewEnv :: TcM TcGblEnv -> (TcGblEnv -> TcM a) -> TcM a
218 inNewEnv env cont = do e <- env
221 rnTyClDecls :: [LTyClDecl RdrName] -> RnM [LTyClDecl Name]
222 -- Used for external core
223 rnTyClDecls tycl_decls = do (decls', _fvs) <- rnList rnTyClDecl tycl_decls
226 addTcgDUs :: TcGblEnv -> DefUses -> TcGblEnv
227 -- This function could be defined lower down in the module hierarchy,
228 -- but there doesn't seem anywhere very logical to put it.
229 addTcgDUs tcg_env dus = tcg_env { tcg_dus = tcg_dus tcg_env `plusDU` dus }
231 rnList :: (a -> RnM (b, FreeVars)) -> [Located a] -> RnM ([Located b], FreeVars)
232 rnList f xs = mapFvRn (wrapLocFstM f) xs
236 %*********************************************************
240 %*********************************************************
243 rnDocDecl :: DocDecl -> RnM DocDecl
244 rnDocDecl (DocCommentNext doc) = do
245 rn_doc <- rnHsDoc doc
246 return (DocCommentNext rn_doc)
247 rnDocDecl (DocCommentPrev doc) = do
248 rn_doc <- rnHsDoc doc
249 return (DocCommentPrev rn_doc)
250 rnDocDecl (DocCommentNamed str doc) = do
251 rn_doc <- rnHsDoc doc
252 return (DocCommentNamed str rn_doc)
253 rnDocDecl (DocGroup lev doc) = do
254 rn_doc <- rnHsDoc doc
255 return (DocGroup lev rn_doc)
259 %*********************************************************
261 Source-code fixity declarations
263 %*********************************************************
266 rnSrcFixityDecls :: NameSet -> [LFixitySig RdrName] -> RnM [LFixitySig Name]
267 -- Rename the fixity decls, so we can put
268 -- the renamed decls in the renamed syntax tree
269 -- Errors if the thing being fixed is not defined locally.
271 -- The returned FixitySigs are not actually used for anything,
272 -- except perhaps the GHCi API
273 rnSrcFixityDecls bound_names fix_decls
274 = do fix_decls <- mapM rn_decl fix_decls
275 return (concat fix_decls)
277 rn_decl :: LFixitySig RdrName -> RnM [LFixitySig Name]
278 -- GHC extension: look up both the tycon and data con
279 -- for con-like things; hence returning a list
280 -- If neither are in scope, report an error; otherwise
281 -- return a fixity sig for each (slightly odd)
282 rn_decl (L loc (FixitySig (L name_loc rdr_name) fixity))
283 = setSrcSpan name_loc $
284 -- this lookup will fail if the definition isn't local
285 do names <- lookupLocalDataTcNames bound_names what rdr_name
286 return [ L loc (FixitySig (L name_loc name) fixity)
288 what = ptext (sLit "fixity signature")
292 %*********************************************************
294 Source-code deprecations declarations
296 %*********************************************************
298 Check that the deprecated names are defined, are defined locally, and
299 that there are no duplicate deprecations.
301 It's only imported deprecations, dealt with in RnIfaces, that we
302 gather them together.
305 -- checks that the deprecations are defined locally, and that there are no duplicates
306 rnSrcWarnDecls :: NameSet -> [LWarnDecl RdrName] -> RnM Warnings
307 rnSrcWarnDecls _bound_names []
310 rnSrcWarnDecls bound_names decls
311 = do { -- check for duplicates
312 ; mapM_ (\ (L loc rdr:lrdr':_) -> addErrAt loc (dupWarnDecl lrdr' rdr))
314 ; pairs_s <- mapM (addLocM rn_deprec) decls
315 ; return (WarnSome ((concat pairs_s))) }
317 rn_deprec (Warning rdr_name txt)
318 -- ensures that the names are defined locally
319 = lookupLocalDataTcNames bound_names what rdr_name `thenM` \ names ->
320 return [(nameOccName name, txt) | name <- names]
322 what = ptext (sLit "deprecation")
324 -- look for duplicates among the OccNames;
325 -- we check that the names are defined above
326 -- invt: the lists returned by findDupsEq always have at least two elements
327 warn_rdr_dups = findDupsEq (\ x -> \ y -> rdrNameOcc (unLoc x) == rdrNameOcc (unLoc y))
328 (map (\ (L loc (Warning rdr_name _)) -> L loc rdr_name) decls)
330 dupWarnDecl :: Located RdrName -> RdrName -> SDoc
331 -- Located RdrName -> DeprecDecl RdrName -> SDoc
332 dupWarnDecl (L loc _) rdr_name
333 = vcat [ptext (sLit "Multiple warning declarations for") <+> quotes (ppr rdr_name),
334 ptext (sLit "also at ") <+> ppr loc]
338 %*********************************************************
340 \subsection{Annotation declarations}
342 %*********************************************************
345 rnAnnDecl :: AnnDecl RdrName -> RnM (AnnDecl Name, FreeVars)
346 rnAnnDecl (HsAnnotation provenance expr) = do
347 (provenance', provenance_fvs) <- rnAnnProvenance provenance
348 (expr', expr_fvs) <- rnLExpr expr
349 return (HsAnnotation provenance' expr', provenance_fvs `plusFV` expr_fvs)
351 rnAnnProvenance :: AnnProvenance RdrName -> RnM (AnnProvenance Name, FreeVars)
352 rnAnnProvenance provenance = do
353 provenance' <- modifyAnnProvenanceNameM lookupTopBndrRn provenance
354 return (provenance', maybe emptyFVs unitFV (annProvenanceName_maybe provenance'))
357 %*********************************************************
359 \subsection{Default declarations}
361 %*********************************************************
364 rnDefaultDecl :: DefaultDecl RdrName -> RnM (DefaultDecl Name, FreeVars)
365 rnDefaultDecl (DefaultDecl tys)
366 = mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) ->
367 return (DefaultDecl tys', fvs)
369 doc_str = text "In a `default' declaration"
372 %*********************************************************
374 \subsection{Foreign declarations}
376 %*********************************************************
379 rnHsForeignDecl :: ForeignDecl RdrName -> RnM (ForeignDecl Name, FreeVars)
380 rnHsForeignDecl (ForeignImport name ty spec)
381 = getTopEnv `thenM` \ (topEnv :: HscEnv) ->
382 lookupLocatedTopBndrRn name `thenM` \ name' ->
383 rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
385 -- Mark any PackageTarget style imports as coming from the current package
386 let packageId = thisPackage $ hsc_dflags topEnv
387 spec' = patchForeignImport packageId spec
389 in return (ForeignImport name' ty' spec', fvs)
391 rnHsForeignDecl (ForeignExport name ty spec)
392 = lookupLocatedOccRn name `thenM` \ name' ->
393 rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
394 return (ForeignExport name' ty' spec, fvs `addOneFV` unLoc name')
395 -- NB: a foreign export is an *occurrence site* for name, so
396 -- we add it to the free-variable list. It might, for example,
397 -- be imported from another module
399 fo_decl_msg :: Located RdrName -> SDoc
400 fo_decl_msg name = ptext (sLit "In the foreign declaration for") <+> ppr name
403 -- | For Windows DLLs we need to know what packages imported symbols are from
404 -- to generate correct calls. Imported symbols are tagged with the current
405 -- package, so if they get inlined across a package boundry we'll still
406 -- know where they're from.
408 patchForeignImport :: PackageId -> ForeignImport -> ForeignImport
409 patchForeignImport packageId (CImport cconv safety fs spec)
410 = CImport cconv safety fs (patchCImportSpec packageId spec)
412 patchCImportSpec :: PackageId -> CImportSpec -> CImportSpec
413 patchCImportSpec packageId spec
415 CFunction callTarget -> CFunction $ patchCCallTarget packageId callTarget
418 patchCCallTarget :: PackageId -> CCallTarget -> CCallTarget
419 patchCCallTarget packageId callTarget
421 StaticTarget label Nothing
422 -> StaticTarget label (Just packageId)
430 %*********************************************************
432 \subsection{Instance declarations}
434 %*********************************************************
437 rnSrcInstDecl :: InstDecl RdrName -> RnM (InstDecl Name, FreeVars)
438 rnSrcInstDecl (InstDecl inst_ty mbinds uprags ats)
439 -- Used for both source and interface file decls
440 = rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' ->
442 -- Rename the bindings
443 -- The typechecker (not the renamer) checks that all
444 -- the bindings are for the right class
446 meth_names = collectMethodBinders mbinds
447 (inst_tyvars, _, cls,_) = splitHsInstDeclTy (unLoc inst_ty')
449 checkDupRdrNames meth_names `thenM_`
450 -- Check that the same method is not given twice in the
451 -- same instance decl instance C T where
455 -- We must use checkDupRdrNames because the Name of the
456 -- method is the Name of the class selector, whose SrcSpan
457 -- points to the class declaration
459 extendTyVarEnvForMethodBinds inst_tyvars (
460 -- (Slightly strangely) the forall-d tyvars scope over
461 -- the method bindings too
462 rnMethodBinds cls (\_ -> []) -- No scoped tyvars
464 ) `thenM` \ (mbinds', meth_fvs) ->
465 -- Rename the associated types
466 -- The typechecker (not the renamer) checks that all
467 -- the declarations are for the right class
469 at_names = map (head . hsTyClDeclBinders) ats
471 checkDupRdrNames at_names `thenM_`
472 -- See notes with checkDupRdrNames for methods, above
474 rnATInsts ats `thenM` \ (ats', at_fvs) ->
476 -- Rename the prags and signatures.
477 -- Note that the type variables are not in scope here,
478 -- so that instance Eq a => Eq (T a) where
479 -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
482 -- But the (unqualified) method names are in scope
484 binders = collectHsBindsBinders mbinds'
485 bndr_set = mkNameSet binders
487 bindLocalNames binders
488 (renameSigs (Just bndr_set) okInstDclSig uprags) `thenM` \ uprags' ->
490 return (InstDecl inst_ty' mbinds' uprags' ats',
491 meth_fvs `plusFV` at_fvs
492 `plusFV` hsSigsFVs uprags'
493 `plusFV` extractHsTyNames inst_ty')
494 -- We return the renamed associated data type declarations so
495 -- that they can be entered into the list of type declarations
496 -- for the binding group, but we also keep a copy in the instance.
497 -- The latter is needed for well-formedness checks in the type
498 -- checker (eg, to ensure that all ATs of the instance actually
499 -- receive a declaration).
500 -- NB: Even the copies in the instance declaration carry copies of
501 -- the instance context after renaming. This is a bit
502 -- strange, but should not matter (and it would be more work
503 -- to remove the context).
506 Renaming of the associated types in instances.
509 rnATInsts :: [LTyClDecl RdrName] -> RnM ([LTyClDecl Name], FreeVars)
510 rnATInsts atDecls = rnList rnATInst atDecls
512 rnATInst tydecl@TyData {} = rnTyClDecl tydecl
513 rnATInst tydecl@TySynonym {} = rnTyClDecl tydecl
515 pprPanic "RnSource.rnATInsts: invalid AT instance"
516 (ppr (tcdName tydecl))
519 For the method bindings in class and instance decls, we extend the
520 type variable environment iff -fglasgow-exts
523 extendTyVarEnvForMethodBinds :: [LHsTyVarBndr Name]
524 -> RnM (Bag (LHsBind Name), FreeVars)
525 -> RnM (Bag (LHsBind Name), FreeVars)
526 extendTyVarEnvForMethodBinds tyvars thing_inside
527 = do { scoped_tvs <- xoptM Opt_ScopedTypeVariables
529 extendTyVarEnvFVRn (map hsLTyVarName tyvars) thing_inside
534 %*********************************************************
536 \subsection{Stand-alone deriving declarations}
538 %*********************************************************
541 rnSrcDerivDecl :: DerivDecl RdrName -> RnM (DerivDecl Name, FreeVars)
542 rnSrcDerivDecl (DerivDecl ty)
543 = do { standalone_deriv_ok <- xoptM Opt_StandaloneDeriving
544 ; unless standalone_deriv_ok (addErr standaloneDerivErr)
545 ; ty' <- rnLHsType (text "a deriving decl") ty
546 ; let fvs = extractHsTyNames ty'
547 ; return (DerivDecl ty', fvs) }
549 standaloneDerivErr :: SDoc
551 = hang (ptext (sLit "Illegal standalone deriving declaration"))
552 2 (ptext (sLit "Use -XStandaloneDeriving to enable this extension"))
555 %*********************************************************
559 %*********************************************************
562 rnHsRuleDecl :: RuleDecl RdrName -> RnM (RuleDecl Name, FreeVars)
563 rnHsRuleDecl (HsRule rule_name act vars lhs _fv_lhs rhs _fv_rhs)
564 = bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $
565 bindLocatedLocalsFV (map get_var vars) $ \ ids ->
566 do { (vars', fv_vars) <- mapFvRn rn_var (vars `zip` ids)
567 -- NB: The binders in a rule are always Ids
568 -- We don't (yet) support type variables
570 ; (lhs', fv_lhs') <- rnLExpr lhs
571 ; (rhs', fv_rhs') <- rnLExpr rhs
573 ; checkValidRule rule_name ids lhs' fv_lhs'
575 ; return (HsRule rule_name act vars' lhs' fv_lhs' rhs' fv_rhs',
576 fv_vars `plusFV` fv_lhs' `plusFV` fv_rhs') }
578 doc = text "In the transformation rule" <+> ftext rule_name
580 get_var (RuleBndr v) = v
581 get_var (RuleBndrSig v _) = v
583 rn_var (RuleBndr (L loc _), id)
584 = return (RuleBndr (L loc id), emptyFVs)
585 rn_var (RuleBndrSig (L loc _) t, id)
586 = rnHsTypeFVs doc t `thenM` \ (t', fvs) ->
587 return (RuleBndrSig (L loc id) t', fvs)
589 badRuleVar :: FastString -> Name -> SDoc
591 = sep [ptext (sLit "Rule") <+> doubleQuotes (ftext name) <> colon,
592 ptext (sLit "Forall'd variable") <+> quotes (ppr var) <+>
593 ptext (sLit "does not appear on left hand side")]
596 Note [Rule LHS validity checking]
597 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
598 Check the shape of a transformation rule LHS. Currently we only allow
599 LHSs of the form @(f e1 .. en)@, where @f@ is not one of the
600 @forall@'d variables.
602 We used restrict the form of the 'ei' to prevent you writing rules
603 with LHSs with a complicated desugaring (and hence unlikely to match);
604 (e.g. a case expression is not allowed: too elaborate.)
606 But there are legitimate non-trivial args ei, like sections and
607 lambdas. So it seems simmpler not to check at all, and that is why
608 check_e is commented out.
611 checkValidRule :: FastString -> [Name] -> LHsExpr Name -> NameSet -> RnM ()
612 checkValidRule rule_name ids lhs' fv_lhs'
613 = do { -- Check for the form of the LHS
614 case (validRuleLhs ids lhs') of
616 Just bad -> failWithTc (badRuleLhsErr rule_name lhs' bad)
618 -- Check that LHS vars are all bound
619 ; let bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs')]
620 ; mapM_ (addErr . badRuleVar rule_name) bad_vars }
622 validRuleLhs :: [Name] -> LHsExpr Name -> Maybe (HsExpr Name)
624 -- Just e => Not ok, and e is the offending expression
625 validRuleLhs foralls lhs
628 checkl (L _ e) = check e
630 check (OpApp e1 op _ e2) = checkl op `mplus` checkl_e e1 `mplus` checkl_e e2
631 check (HsApp e1 e2) = checkl e1 `mplus` checkl_e e2
632 check (HsVar v) | v `notElem` foralls = Nothing
633 check other = Just other -- Failure
636 checkl_e (L _ _e) = Nothing -- Was (check_e e); see Note [Rule LHS validity checking]
638 {- Commented out; see Note [Rule LHS validity checking] above
639 check_e (HsVar v) = Nothing
640 check_e (HsPar e) = checkl_e e
641 check_e (HsLit e) = Nothing
642 check_e (HsOverLit e) = Nothing
644 check_e (OpApp e1 op _ e2) = checkl_e e1 `mplus` checkl_e op `mplus` checkl_e e2
645 check_e (HsApp e1 e2) = checkl_e e1 `mplus` checkl_e e2
646 check_e (NegApp e _) = checkl_e e
647 check_e (ExplicitList _ es) = checkl_es es
648 check_e other = Just other -- Fails
650 checkl_es es = foldr (mplus . checkl_e) Nothing es
653 badRuleLhsErr :: FastString -> LHsExpr Name -> HsExpr Name -> SDoc
654 badRuleLhsErr name lhs bad_e
655 = sep [ptext (sLit "Rule") <+> ftext name <> colon,
656 nest 4 (vcat [ptext (sLit "Illegal expression:") <+> ppr bad_e,
657 ptext (sLit "in left-hand side:") <+> ppr lhs])]
659 ptext (sLit "LHS must be of form (f e1 .. en) where f is not forall'd")
663 %*********************************************************
665 \subsection{Type, class and iface sig declarations}
667 %*********************************************************
669 @rnTyDecl@ uses the `global name function' to create a new type
670 declaration in which local names have been replaced by their original
671 names, reporting any unknown names.
673 Renaming type variables is a pain. Because they now contain uniques,
674 it is necessary to pass in an association list which maps a parsed
675 tyvar to its @Name@ representation.
676 In some cases (type signatures of values),
677 it is even necessary to go over the type first
678 in order to get the set of tyvars used by it, make an assoc list,
679 and then go over it again to rename the tyvars!
680 However, we can also do some scoping checks at the same time.
683 rnTyClDecl :: TyClDecl RdrName -> RnM (TyClDecl Name, FreeVars)
684 rnTyClDecl (ForeignType {tcdLName = name, tcdExtName = ext_name})
685 = lookupLocatedTopBndrRn name `thenM` \ name' ->
686 return (ForeignType {tcdLName = name', tcdExtName = ext_name},
689 -- all flavours of type family declarations ("type family", "newtype fanily",
690 -- and "data family")
691 rnTyClDecl tydecl@TyFamily {} = rnFamily tydecl bindTyVarsFV
693 -- "data", "newtype", "data instance, and "newtype instance" declarations
694 rnTyClDecl tydecl@TyData {tcdND = new_or_data, tcdCtxt = context,
695 tcdLName = tycon, tcdTyVars = tyvars,
696 tcdTyPats = typats, tcdCons = condecls,
697 tcdKindSig = sig, tcdDerivs = derivs}
698 = do { tycon' <- if isFamInstDecl tydecl
699 then lookupLocatedOccRn tycon -- may be imported family
700 else lookupLocatedTopBndrRn tycon
701 ; checkTc (h98_style || null (unLoc context))
702 (badGadtStupidTheta tycon)
703 ; ((tyvars', context', typats', derivs'), stuff_fvs)
704 <- bindTyVarsFV tyvars $ \ tyvars' -> do
705 -- Checks for distinct tyvars
706 { context' <- rnContext data_doc context
707 ; (typats', fvs1) <- rnTyPats data_doc tycon' typats
708 ; (derivs', fvs2) <- rn_derivs derivs
709 ; let fvs = fvs1 `plusFV` fvs2 `plusFV`
710 extractHsCtxtTyNames context'
711 ; return ((tyvars', context', typats', derivs'), fvs) }
713 -- For the constructor declarations, bring into scope the tyvars
714 -- bound by the header, but *only* in the H98 case
715 -- Reason: for GADTs, the type variables in the declaration
716 -- do not scope over the constructor signatures
717 -- data T a where { T1 :: forall b. b-> b }
718 ; let tc_tvs_in_scope | h98_style = hsLTyVarNames tyvars'
720 ; (condecls', con_fvs) <- bindLocalNamesFV tc_tvs_in_scope $
722 -- No need to check for duplicate constructor decls
723 -- since that is done by RnNames.extendGlobalRdrEnvRn
725 ; return (TyData {tcdND = new_or_data, tcdCtxt = context',
726 tcdLName = tycon', tcdTyVars = tyvars',
727 tcdTyPats = typats', tcdKindSig = sig,
728 tcdCons = condecls', tcdDerivs = derivs'},
729 con_fvs `plusFV` stuff_fvs)
732 h98_style = case condecls of -- Note [Stupid theta]
733 L _ (ConDecl { con_res = ResTyGADT {} }) : _ -> False
736 data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
738 rn_derivs Nothing = return (Nothing, emptyFVs)
739 rn_derivs (Just ds) = rnLHsTypes data_doc ds `thenM` \ ds' ->
740 return (Just ds', extractHsTyNames_s ds')
742 -- "type" and "type instance" declarations
743 rnTyClDecl tydecl@(TySynonym {tcdLName = name, tcdTyVars = tyvars,
744 tcdTyPats = typats, tcdSynRhs = ty})
745 = bindTyVarsFV tyvars $ \ tyvars' -> do
746 { -- Checks for distinct tyvars
747 name' <- if isFamInstDecl tydecl
748 then lookupLocatedOccRn name -- may be imported family
749 else lookupLocatedTopBndrRn name
750 ; (typats',fvs1) <- rnTyPats syn_doc name' typats
751 ; (ty', fvs2) <- rnHsTypeFVs syn_doc ty
752 ; return (TySynonym { tcdLName = name', tcdTyVars = tyvars'
753 , tcdTyPats = typats', tcdSynRhs = ty'},
754 fvs1 `plusFV` fvs2) }
756 syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name)
758 rnTyClDecl (ClassDecl {tcdCtxt = context, tcdLName = cname,
759 tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
760 tcdMeths = mbinds, tcdATs = ats, tcdDocs = docs})
761 = do { cname' <- lookupLocatedTopBndrRn cname
763 -- Tyvars scope over superclass context and method signatures
764 ; ((tyvars', context', fds', ats', sigs'), stuff_fvs)
765 <- bindTyVarsFV tyvars $ \ tyvars' -> do
766 -- Checks for distinct tyvars
767 { context' <- rnContext cls_doc context
768 ; fds' <- rnFds cls_doc fds
769 ; (ats', at_fvs) <- rnATs ats
770 ; sigs' <- renameSigs Nothing okClsDclSig sigs
771 ; let fvs = at_fvs `plusFV`
772 extractHsCtxtTyNames context' `plusFV`
774 -- The fundeps have no free variables
775 ; return ((tyvars', context', fds', ats', sigs'), fvs) }
777 -- No need to check for duplicate associated type decls
778 -- since that is done by RnNames.extendGlobalRdrEnvRn
780 -- Check the signatures
781 -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
782 ; let sig_rdr_names_w_locs = [op | L _ (TypeSig op _) <- sigs]
783 ; checkDupRdrNames sig_rdr_names_w_locs
784 -- Typechecker is responsible for checking that we only
785 -- give default-method bindings for things in this class.
786 -- The renamer *could* check this for class decls, but can't
787 -- for instance decls.
789 -- The newLocals call is tiresome: given a generic class decl
792 -- op {| x+y |} (Inl a) = ...
793 -- op {| x+y |} (Inr b) = ...
794 -- op {| a*b |} (a*b) = ...
795 -- we want to name both "x" tyvars with the same unique, so that they are
796 -- easy to group together in the typechecker.
797 ; (mbinds', meth_fvs)
798 <- extendTyVarEnvForMethodBinds tyvars' $ do
799 { name_env <- getLocalRdrEnv
800 ; let gen_rdr_tyvars_w_locs = [ tv | tv <- extractGenericPatTyVars mbinds,
801 not (unLoc tv `elemLocalRdrEnv` name_env) ]
802 -- No need to check for duplicate method signatures
803 -- since that is done by RnNames.extendGlobalRdrEnvRn
804 -- and the methods are already in scope
805 ; gen_tyvars <- newLocalBndrsRn gen_rdr_tyvars_w_locs
806 ; rnMethodBinds (unLoc cname') (mkSigTvFn sigs') gen_tyvars mbinds }
809 ; docs' <- mapM (wrapLocM rnDocDecl) docs
811 ; return (ClassDecl { tcdCtxt = context', tcdLName = cname',
812 tcdTyVars = tyvars', tcdFDs = fds', tcdSigs = sigs',
813 tcdMeths = mbinds', tcdATs = ats', tcdDocs = docs'},
814 meth_fvs `plusFV` stuff_fvs) }
816 cls_doc = text "In the declaration for class" <+> ppr cname
818 badGadtStupidTheta :: Located RdrName -> SDoc
820 = vcat [ptext (sLit "No context is allowed on a GADT-style data declaration"),
821 ptext (sLit "(You can put a context on each contructor, though.)")]
826 Trac #3850 complains about a regression wrt 6.10 for
828 There is no reason not to allow the stupid theta if there are no data
829 constructors. It's still stupid, but does no harm, and I don't want
830 to cause programs to break unnecessarily (notably HList). So if there
831 are no data constructors we allow h98_style = True
834 %*********************************************************
836 \subsection{Support code for type/data declarations}
838 %*********************************************************
841 rnTyPats :: SDoc -> Located Name -> Maybe [LHsType RdrName] -> RnM (Maybe [LHsType Name], FreeVars)
842 -- Although, we are processing type patterns here, all type variables will
843 -- already be in scope (they are the same as in the 'tcdTyVars' field of the
844 -- type declaration to which these patterns belong)
846 = return (Nothing, emptyFVs)
847 rnTyPats doc tc (Just typats)
848 = do { typats' <- rnLHsTypes doc typats
849 ; let fvs = addOneFV (extractHsTyNames_s typats') (unLoc tc)
850 -- type instance => use, hence addOneFV
851 ; return (Just typats', fvs) }
853 rnConDecls :: [LConDecl RdrName] -> RnM ([LConDecl Name], FreeVars)
855 = do { condecls' <- mapM (wrapLocM rnConDecl) condecls
856 ; return (condecls', plusFVs (map conDeclFVs condecls')) }
858 rnConDecl :: ConDecl RdrName -> RnM (ConDecl Name)
859 rnConDecl decl@(ConDecl { con_name = name, con_qvars = tvs
860 , con_cxt = cxt, con_details = details
861 , con_res = res_ty, con_doc = mb_doc
862 , con_old_rec = old_rec, con_explicit = expl })
863 = do { addLocM checkConName name
864 ; when old_rec (addWarn (deprecRecSyntax decl))
865 ; new_name <- lookupLocatedTopBndrRn name
867 -- For H98 syntax, the tvs are the existential ones
868 -- For GADT syntax, the tvs are all the quantified tyvars
869 -- Hence the 'filter' in the ResTyH98 case only
870 ; rdr_env <- getLocalRdrEnv
871 ; let in_scope = (`elemLocalRdrEnv` rdr_env) . unLoc
872 arg_tys = hsConDeclArgTys details
873 implicit_tvs = case res_ty of
874 ResTyH98 -> filterOut in_scope (get_rdr_tvs arg_tys)
875 ResTyGADT ty -> get_rdr_tvs (ty : arg_tys)
876 new_tvs = case expl of
878 Implicit -> userHsTyVarBndrs implicit_tvs
880 ; mb_doc' <- rnMbLHsDoc mb_doc
882 ; bindTyVarsRn new_tvs $ \new_tyvars -> do
883 { new_context <- rnContext doc cxt
884 ; new_details <- rnConDeclDetails doc details
885 ; (new_details', new_res_ty) <- rnConResult doc new_details res_ty
886 ; return (decl { con_name = new_name, con_qvars = new_tyvars, con_cxt = new_context
887 , con_details = new_details', con_res = new_res_ty, con_doc = mb_doc' }) }}
889 doc = text "In the definition of data constructor" <+> quotes (ppr name)
890 get_rdr_tvs tys = extractHsRhoRdrTyVars cxt (noLoc (HsTupleTy Boxed tys))
893 -> HsConDetails (LHsType Name) [ConDeclField Name]
895 -> RnM (HsConDetails (LHsType Name) [ConDeclField Name],
897 rnConResult _ details ResTyH98 = return (details, ResTyH98)
898 rnConResult doc details (ResTyGADT ty)
899 = do { ty' <- rnLHsType doc ty
900 ; let (arg_tys, res_ty) = splitHsFunType ty'
901 -- We can finally split it up,
902 -- now the renamer has dealt with fixities
903 -- See Note [Sorting out the result type] in RdrHsSyn
905 details' = case details of
907 PrefixCon {} -> PrefixCon arg_tys
908 InfixCon {} -> pprPanic "rnConResult" (ppr ty)
909 -- See Note [Sorting out the result type] in RdrHsSyn
911 ; when (not (null arg_tys) && case details of { RecCon {} -> True; _ -> False })
912 (addErr (badRecResTy doc))
913 ; return (details', ResTyGADT res_ty) }
915 rnConDeclDetails :: SDoc
916 -> HsConDetails (LHsType RdrName) [ConDeclField RdrName]
917 -> RnM (HsConDetails (LHsType Name) [ConDeclField Name])
918 rnConDeclDetails doc (PrefixCon tys)
919 = mapM (rnLHsType doc) tys `thenM` \ new_tys ->
920 return (PrefixCon new_tys)
922 rnConDeclDetails doc (InfixCon ty1 ty2)
923 = rnLHsType doc ty1 `thenM` \ new_ty1 ->
924 rnLHsType doc ty2 `thenM` \ new_ty2 ->
925 return (InfixCon new_ty1 new_ty2)
927 rnConDeclDetails doc (RecCon fields)
928 = do { new_fields <- rnConDeclFields doc fields
929 -- No need to check for duplicate fields
930 -- since that is done by RnNames.extendGlobalRdrEnvRn
931 ; return (RecCon new_fields) }
933 -- Rename family declarations
935 -- * This function is parametrised by the routine handling the index
936 -- variables. On the toplevel, these are defining occurences, whereas they
937 -- are usage occurences for associated types.
939 rnFamily :: TyClDecl RdrName
940 -> ([LHsTyVarBndr RdrName] ->
941 ([LHsTyVarBndr Name] -> RnM (TyClDecl Name, FreeVars)) ->
942 RnM (TyClDecl Name, FreeVars))
943 -> RnM (TyClDecl Name, FreeVars)
945 rnFamily (tydecl@TyFamily {tcdFlavour = flavour,
946 tcdLName = tycon, tcdTyVars = tyvars})
948 do { bindIdxVars tyvars $ \tyvars' -> do {
949 ; tycon' <- lookupLocatedTopBndrRn tycon
950 ; return (TyFamily {tcdFlavour = flavour, tcdLName = tycon',
951 tcdTyVars = tyvars', tcdKind = tcdKind tydecl},
954 rnFamily d _ = pprPanic "rnFamily" (ppr d)
956 -- Rename associated type declarations (in classes)
958 -- * This can be family declarations and (default) type instances
960 rnATs :: [LTyClDecl RdrName] -> RnM ([LTyClDecl Name], FreeVars)
961 rnATs ats = mapFvRn (wrapLocFstM rn_at) ats
963 rn_at (tydecl@TyFamily {}) = rnFamily tydecl lookupIdxVars
964 rn_at (tydecl@TySynonym {}) =
966 unless (isNothing (tcdTyPats tydecl)) $ addErr noPatterns
968 rn_at _ = panic "RnSource.rnATs: invalid TyClDecl"
970 lookupIdxVars tyvars cont =
971 do { checkForDups tyvars
972 ; tyvars' <- mapM lookupIdxVar tyvars
975 -- Type index variables must be class parameters, which are the only
976 -- type variables in scope at this point.
977 lookupIdxVar (L l tyvar) =
979 name' <- lookupOccRn (hsTyVarName tyvar)
980 return $ L l (replaceTyVarName tyvar name')
982 -- Type variable may only occur once.
984 checkForDups [] = return ()
985 checkForDups (L loc tv:ltvs) =
986 do { setSrcSpan loc $
987 when (hsTyVarName tv `ltvElem` ltvs) $
988 addErr (repeatedTyVar tv)
992 _ `ltvElem` [] = False
993 rdrName `ltvElem` (L _ tv:ltvs)
994 | rdrName == hsTyVarName tv = True
995 | otherwise = rdrName `ltvElem` ltvs
997 deprecRecSyntax :: ConDecl RdrName -> SDoc
999 = vcat [ ptext (sLit "Declaration of") <+> quotes (ppr (con_name decl))
1000 <+> ptext (sLit "uses deprecated syntax")
1001 , ptext (sLit "Instead, use the form")
1002 , nest 2 (ppr decl) ] -- Pretty printer uses new form
1004 badRecResTy :: SDoc -> SDoc
1005 badRecResTy doc = ptext (sLit "Malformed constructor signature") $$ doc
1008 noPatterns = text "Default definition for an associated synonym cannot have"
1009 <+> text "type pattern"
1011 repeatedTyVar :: HsTyVarBndr RdrName -> SDoc
1012 repeatedTyVar tv = ptext (sLit "Illegal repeated type variable") <+>
1015 -- This data decl will parse OK
1017 -- treating "a" as the constructor.
1018 -- It is really hard to make the parser spot this malformation.
1019 -- So the renamer has to check that the constructor is legal
1021 -- We can get an operator as the constructor, even in the prefix form:
1022 -- data T = :% Int Int
1023 -- from interface files, which always print in prefix form
1025 checkConName :: RdrName -> TcRn ()
1026 checkConName name = checkErr (isRdrDataCon name) (badDataCon name)
1028 badDataCon :: RdrName -> SDoc
1030 = hsep [ptext (sLit "Illegal data constructor name"), quotes (ppr name)]
1034 %*********************************************************
1036 \subsection{Support code for type/data declarations}
1038 %*********************************************************
1040 Get the mapping from constructors to fields for this module.
1041 It's convenient to do this after the data type decls have been renamed
1043 extendRecordFieldEnv :: [LTyClDecl RdrName] -> [LInstDecl RdrName] -> TcM TcGblEnv
1044 extendRecordFieldEnv tycl_decls inst_decls
1045 = do { tcg_env <- getGblEnv
1046 ; field_env' <- foldrM get_con (tcg_field_env tcg_env) all_data_cons
1047 ; return (tcg_env { tcg_field_env = field_env' }) }
1049 -- we want to lookup:
1050 -- (a) a datatype constructor
1051 -- (b) a record field
1052 -- knowing that they're from this module.
1053 -- lookupLocatedTopBndrRn does this, because it does a lookupGreLocalRn,
1054 -- which keeps only the local ones.
1055 lookup x = do { x' <- lookupLocatedTopBndrRn x
1056 ; return $ unLoc x'}
1058 all_data_cons :: [ConDecl RdrName]
1059 all_data_cons = [con | L _ (TyData { tcdCons = cons }) <- all_tycl_decls
1061 all_tycl_decls = at_tycl_decls ++ tycl_decls
1062 at_tycl_decls = instDeclATs inst_decls -- Do not forget associated types!
1064 get_con (ConDecl { con_name = con, con_details = RecCon flds })
1065 (RecFields env fld_set)
1066 = do { con' <- lookup con
1067 ; flds' <- mapM lookup (map cd_fld_name flds)
1068 ; let env' = extendNameEnv env con' flds'
1069 fld_set' = addListToNameSet fld_set flds'
1070 ; return $ (RecFields env' fld_set') }
1071 get_con _ env = return env
1074 %*********************************************************
1076 \subsection{Support code to rename types}
1078 %*********************************************************
1081 rnFds :: SDoc -> [Located (FunDep RdrName)] -> RnM [Located (FunDep Name)]
1084 = mapM (wrapLocM rn_fds) fds
1087 = rnHsTyVars doc tys1 `thenM` \ tys1' ->
1088 rnHsTyVars doc tys2 `thenM` \ tys2' ->
1089 return (tys1', tys2')
1091 rnHsTyVars :: SDoc -> [RdrName] -> RnM [Name]
1092 rnHsTyVars doc tvs = mapM (rnHsTyVar doc) tvs
1094 rnHsTyVar :: SDoc -> RdrName -> RnM Name
1095 rnHsTyVar _doc tyvar = lookupOccRn tyvar
1099 %*********************************************************
1103 %*********************************************************
1105 This code marches down the declarations, looking for the first
1106 Template Haskell splice. As it does so it
1107 a) groups the declarations into a HsGroup
1108 b) runs any top-level quasi-quotes
1111 findSplice :: [LHsDecl RdrName] -> RnM (HsGroup RdrName, Maybe (SpliceDecl RdrName, [LHsDecl RdrName]))
1112 findSplice ds = addl emptyRdrGroup ds
1114 addl :: HsGroup RdrName -> [LHsDecl RdrName]
1115 -> RnM (HsGroup RdrName, Maybe (SpliceDecl RdrName, [LHsDecl RdrName]))
1116 -- This stuff reverses the declarations (again) but it doesn't matter
1117 addl gp [] = return (gp, Nothing)
1118 addl gp (L l d : ds) = add gp l d ds
1121 add :: HsGroup RdrName -> SrcSpan -> HsDecl RdrName -> [LHsDecl RdrName]
1122 -> RnM (HsGroup RdrName, Maybe (SpliceDecl RdrName, [LHsDecl RdrName]))
1124 add gp loc (SpliceD splice@(SpliceDecl _ flag)) ds
1125 = do { -- We've found a top-level splice. If it is an *implicit* one
1126 -- (i.e. a naked top level expression)
1128 Explicit -> return ()
1129 Implicit -> do { th_on <- xoptM Opt_TemplateHaskell
1130 ; unless th_on $ setSrcSpan loc $
1131 failWith badImplicitSplice }
1133 ; return (gp, Just (splice, ds)) }
1135 badImplicitSplice = ptext (sLit "Parse error: naked expression at top level")
1138 add _ _ (QuasiQuoteD qq) _
1139 = pprPanic "Can't do QuasiQuote declarations without GHCi" (ppr qq)
1141 add gp _ (QuasiQuoteD qq) ds -- Expand quasiquotes
1142 = do { ds' <- runQuasiQuoteDecl qq
1143 ; addl gp (ds' ++ ds) }
1146 -- Class declarations: pull out the fixity signatures to the top
1147 add gp@(HsGroup {hs_tyclds = ts, hs_fixds = fs}) l (TyClD d) ds
1149 = let fsigs = [ L l f | L l (FixSig f) <- tcdSigs d ] in
1150 addl (gp { hs_tyclds = L l d : ts, hs_fixds = fsigs ++ fs}) ds
1152 = addl (gp { hs_tyclds = L l d : ts }) ds
1154 -- Signatures: fixity sigs go a different place than all others
1155 add gp@(HsGroup {hs_fixds = ts}) l (SigD (FixSig f)) ds
1156 = addl (gp {hs_fixds = L l f : ts}) ds
1157 add gp@(HsGroup {hs_valds = ts}) l (SigD d) ds
1158 = addl (gp {hs_valds = add_sig (L l d) ts}) ds
1160 -- Value declarations: use add_bind
1161 add gp@(HsGroup {hs_valds = ts}) l (ValD d) ds
1162 = addl (gp { hs_valds = add_bind (L l d) ts }) ds
1164 -- The rest are routine
1165 add gp@(HsGroup {hs_instds = ts}) l (InstD d) ds
1166 = addl (gp { hs_instds = L l d : ts }) ds
1167 add gp@(HsGroup {hs_derivds = ts}) l (DerivD d) ds
1168 = addl (gp { hs_derivds = L l d : ts }) ds
1169 add gp@(HsGroup {hs_defds = ts}) l (DefD d) ds
1170 = addl (gp { hs_defds = L l d : ts }) ds
1171 add gp@(HsGroup {hs_fords = ts}) l (ForD d) ds
1172 = addl (gp { hs_fords = L l d : ts }) ds
1173 add gp@(HsGroup {hs_warnds = ts}) l (WarningD d) ds
1174 = addl (gp { hs_warnds = L l d : ts }) ds
1175 add gp@(HsGroup {hs_annds = ts}) l (AnnD d) ds
1176 = addl (gp { hs_annds = L l d : ts }) ds
1177 add gp@(HsGroup {hs_ruleds = ts}) l (RuleD d) ds
1178 = addl (gp { hs_ruleds = L l d : ts }) ds
1179 add gp l (DocD d) ds
1180 = addl (gp { hs_docs = (L l d) : (hs_docs gp) }) ds
1182 add_bind :: LHsBind a -> HsValBinds a -> HsValBinds a
1183 add_bind b (ValBindsIn bs sigs) = ValBindsIn (bs `snocBag` b) sigs
1184 add_bind _ (ValBindsOut {}) = panic "RdrHsSyn:add_bind"
1186 add_sig :: LSig a -> HsValBinds a -> HsValBinds a
1187 add_sig s (ValBindsIn bs sigs) = ValBindsIn bs (s:sigs)
1188 add_sig _ (ValBindsOut {}) = panic "RdrHsSyn:add_sig"