2 % (c) The AQUA Project, Glasgow University, 1996-1998
4 \section[TcHsSyn]{Specialisations of the @HsSyn@ syntax for the typechecker}
6 This module is an extension of @HsSyn@ syntax, for use in the type
11 TcMonoBinds, TcHsBinds, TcPat,
12 TcExpr, TcGRHSs, TcGRHS, TcMatch,
13 TcStmt, TcArithSeqInfo, TcRecordBinds,
14 TcHsModule, TcCoreExpr, TcDictBinds,
17 TypecheckedHsBinds, TypecheckedRuleDecl,
18 TypecheckedMonoBinds, TypecheckedPat,
19 TypecheckedHsExpr, TypecheckedArithSeqInfo,
20 TypecheckedStmt, TypecheckedForeignDecl,
21 TypecheckedMatch, TypecheckedHsModule,
22 TypecheckedGRHSs, TypecheckedGRHS,
23 TypecheckedRecordBinds, TypecheckedDictBinds,
25 mkHsTyApp, mkHsDictApp, mkHsConApp,
26 mkHsTyLam, mkHsDictLam, mkHsLet,
29 -- re-exported from TcEnv
32 zonkTopBinds, zonkId, zonkIdOcc,
33 zonkForeignExports, zonkRules
36 #include "HsVersions.h"
39 import HsSyn -- oodles of it
42 import Id ( idName, idType, idUnfolding, setIdType, omitIfaceSigForId, isIP, Id )
43 import DataCon ( DataCon, dataConWrapId, splitProductType_maybe )
44 import TcEnv ( tcLookupValueMaybe, tcExtendGlobalValEnv, tcGetValueEnv,
45 ValueEnv, TcId, tcInstId
49 import TcType ( TcType, TcTyVar,
50 zonkTcTypeToType, zonkTcTyVarToTyVar, zonkTcType, zonkTcSigTyVars
52 import Name ( isLocallyDefined )
53 import CoreSyn ( Expr )
54 import CoreUnfold( unfoldingTemplate )
55 import BasicTypes ( RecFlag(..) )
64 The @Tc...@ datatypes are the ones that apply {\em during} type checking.
65 All the types in @Tc...@ things have mutable type-variables in them for
68 At the end of type checking we zonk everything to @Typechecked...@ datatypes,
69 which have immutable type variables in them.
72 type TcHsBinds = HsBinds TcId TcPat
73 type TcMonoBinds = MonoBinds TcId TcPat
74 type TcDictBinds = TcMonoBinds
75 type TcPat = OutPat TcId
76 type TcExpr = HsExpr TcId TcPat
77 type TcGRHSs = GRHSs TcId TcPat
78 type TcGRHS = GRHS TcId TcPat
79 type TcMatch = Match TcId TcPat
80 type TcStmt = Stmt TcId TcPat
81 type TcArithSeqInfo = ArithSeqInfo TcId TcPat
82 type TcRecordBinds = HsRecordBinds TcId TcPat
83 type TcHsModule = HsModule TcId TcPat
85 type TcCoreExpr = Expr TcId
86 type TcForeignExportDecl = ForeignDecl TcId
87 type TcRuleDecl = RuleDecl TcId TcPat
89 type TypecheckedPat = OutPat Id
90 type TypecheckedMonoBinds = MonoBinds Id TypecheckedPat
91 type TypecheckedDictBinds = TypecheckedMonoBinds
92 type TypecheckedHsBinds = HsBinds Id TypecheckedPat
93 type TypecheckedHsExpr = HsExpr Id TypecheckedPat
94 type TypecheckedArithSeqInfo = ArithSeqInfo Id TypecheckedPat
95 type TypecheckedStmt = Stmt Id TypecheckedPat
96 type TypecheckedMatch = Match Id TypecheckedPat
97 type TypecheckedGRHSs = GRHSs Id TypecheckedPat
98 type TypecheckedGRHS = GRHS Id TypecheckedPat
99 type TypecheckedRecordBinds = HsRecordBinds Id TypecheckedPat
100 type TypecheckedHsModule = HsModule Id TypecheckedPat
101 type TypecheckedForeignDecl = ForeignDecl Id
102 type TypecheckedRuleDecl = RuleDecl Id TypecheckedPat
106 mkHsTyApp expr [] = expr
107 mkHsTyApp expr tys = TyApp expr tys
109 mkHsDictApp expr [] = expr
110 mkHsDictApp expr dict_vars = DictApp expr dict_vars
112 mkHsTyLam [] expr = expr
113 mkHsTyLam tyvars expr = TyLam tyvars expr
115 mkHsDictLam [] expr = expr
116 mkHsDictLam dicts expr = DictLam dicts expr
118 mkHsLet EmptyMonoBinds expr = expr
119 mkHsLet mbinds expr = HsLet (MonoBind mbinds [] Recursive) expr
121 mkHsConApp data_con tys args = foldl HsApp (HsVar (dataConWrapId data_con) `mkHsTyApp` tys) args
123 idsToMonoBinds :: [Id] -> TcMonoBinds
125 = andMonoBindList [ CoreMonoBind id (unfoldingTemplate (idUnfolding id))
130 %************************************************************************
132 \subsection[BackSubst-HsBinds]{Running a substitution over @HsBinds@}
134 %************************************************************************
136 This zonking pass runs over the bindings
138 a) to convert TcTyVars to TyVars etc, dereferencing any bindings etc
139 b) convert unbound TcTyVar to Void
140 c) convert each TcId to an Id by zonking its type
142 The type variables are converted by binding mutable tyvars to immutable ones
143 and then zonking as normal.
145 The Ids are converted by binding them in the normal Tc envt; that
146 way we maintain sharing; eg an Id is zonked at its binding site and they
147 all occurrences of that Id point to the common zonked copy
149 It's all pretty boring stuff, because HsSyn is such a large type, and
150 the environment manipulation is tiresome.
153 -- zonkId is used *during* typechecking just to zonk the Id's type
154 zonkId :: TcId -> NF_TcM s TcId
156 = zonkTcType (idType id) `thenNF_Tc` \ ty' ->
157 returnNF_Tc (setIdType id ty')
159 -- zonkIdBndr is used *after* typechecking to get the Id's type
160 -- to its final form. The TyVarEnv give
161 zonkIdBndr :: TcId -> NF_TcM s Id
163 = zonkTcTypeToType (idType id) `thenNF_Tc` \ ty' ->
164 returnNF_Tc (setIdType id ty')
166 zonkIdOcc :: TcId -> NF_TcM s Id
168 | not (isLocallyDefined id) || omitIfaceSigForId id || isIP id
169 -- The omitIfaceSigForId thing may look wierd but it's quite
170 -- sensible really. We're avoiding looking up superclass selectors
171 -- and constructors; zonking them is a no-op anyway, and the
172 -- superclass selectors aren't in the environment anyway.
175 = tcLookupValueMaybe (idName id) `thenNF_Tc` \ maybe_id' ->
177 new_id = case maybe_id' of
179 Nothing -> pprTrace "zonkIdOcc: " (ppr id) id
186 zonkTopBinds :: TcMonoBinds -> NF_TcM s (TypecheckedMonoBinds, ValueEnv)
187 zonkTopBinds binds -- Top level is implicitly recursive
188 = fixNF_Tc (\ ~(_, new_ids) ->
189 tcExtendGlobalValEnv (bagToList new_ids) $
190 zonkMonoBinds binds `thenNF_Tc` \ (binds', new_ids) ->
191 tcGetValueEnv `thenNF_Tc` \ env ->
192 returnNF_Tc ((binds', env), new_ids)
193 ) `thenNF_Tc` \ (stuff, _) ->
196 zonkBinds :: TcHsBinds -> NF_TcM s (TypecheckedHsBinds, TcEnv)
199 = go binds (\ binds' -> tcGetEnv `thenNF_Tc` \ env ->
200 returnNF_Tc (binds', env))
203 -- -> (TypecheckedHsBinds
204 -- -> NF_TcM s (TypecheckedHsBinds, TcEnv)
206 -- -> NF_TcM s (TypecheckedHsBinds, TcEnv)
208 go (ThenBinds b1 b2) thing_inside = go b1 $ \ b1' ->
210 thing_inside (b1' `ThenBinds` b2')
212 go EmptyBinds thing_inside = thing_inside EmptyBinds
214 go (MonoBind bind sigs is_rec) thing_inside
215 = ASSERT( null sigs )
216 fixNF_Tc (\ ~(_, new_ids) ->
217 tcExtendGlobalValEnv (bagToList new_ids) $
218 zonkMonoBinds bind `thenNF_Tc` \ (new_bind, new_ids) ->
219 thing_inside (mkMonoBind new_bind [] is_rec) `thenNF_Tc` \ stuff ->
220 returnNF_Tc (stuff, new_ids)
221 ) `thenNF_Tc` \ (stuff, _) ->
226 -------------------------------------------------------------------------
227 zonkMonoBinds :: TcMonoBinds
228 -> NF_TcM s (TypecheckedMonoBinds, Bag Id)
230 zonkMonoBinds EmptyMonoBinds = returnNF_Tc (EmptyMonoBinds, emptyBag)
232 zonkMonoBinds (AndMonoBinds mbinds1 mbinds2)
233 = zonkMonoBinds mbinds1 `thenNF_Tc` \ (b1', ids1) ->
234 zonkMonoBinds mbinds2 `thenNF_Tc` \ (b2', ids2) ->
235 returnNF_Tc (b1' `AndMonoBinds` b2',
236 ids1 `unionBags` ids2)
238 zonkMonoBinds (PatMonoBind pat grhss locn)
239 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
240 zonkGRHSs grhss `thenNF_Tc` \ new_grhss ->
241 returnNF_Tc (PatMonoBind new_pat new_grhss locn, ids)
243 zonkMonoBinds (VarMonoBind var expr)
244 = zonkIdBndr var `thenNF_Tc` \ new_var ->
245 zonkExpr expr `thenNF_Tc` \ new_expr ->
246 returnNF_Tc (VarMonoBind new_var new_expr, unitBag new_var)
248 zonkMonoBinds (CoreMonoBind var core_expr)
249 = zonkIdBndr var `thenNF_Tc` \ new_var ->
250 returnNF_Tc (CoreMonoBind new_var core_expr, unitBag new_var)
252 zonkMonoBinds (FunMonoBind var inf ms locn)
253 = zonkIdBndr var `thenNF_Tc` \ new_var ->
254 mapNF_Tc zonkMatch ms `thenNF_Tc` \ new_ms ->
255 returnNF_Tc (FunMonoBind new_var inf new_ms locn, unitBag new_var)
258 zonkMonoBinds (AbsBinds tyvars dicts exports inlines val_bind)
259 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
260 -- No need to extend tyvar env: the effects are
261 -- propagated through binding the tyvars themselves
263 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
264 tcExtendGlobalValEnv new_dicts $
266 fixNF_Tc (\ ~(_, _, val_bind_ids) ->
267 tcExtendGlobalValEnv (bagToList val_bind_ids) $
268 zonkMonoBinds val_bind `thenNF_Tc` \ (new_val_bind, val_bind_ids) ->
269 mapNF_Tc zonkExport exports `thenNF_Tc` \ new_exports ->
270 returnNF_Tc (new_val_bind, new_exports, val_bind_ids)
271 ) `thenNF_Tc ` \ (new_val_bind, new_exports, _) ->
273 new_globals = listToBag [global | (_, global, local) <- new_exports]
275 returnNF_Tc (AbsBinds new_tyvars new_dicts new_exports inlines new_val_bind,
278 zonkExport (tyvars, global, local)
279 = zonkTcSigTyVars tyvars `thenNF_Tc` \ new_tyvars ->
280 -- This isn't the binding occurrence of these tyvars
281 -- but they should *be* tyvars. Hence zonkTcSigTyVars.
282 zonkIdBndr global `thenNF_Tc` \ new_global ->
283 zonkIdOcc local `thenNF_Tc` \ new_local ->
284 returnNF_Tc (new_tyvars, new_global, new_local)
287 %************************************************************************
289 \subsection[BackSubst-Match-GRHSs]{Match and GRHSs}
291 %************************************************************************
294 zonkMatch :: TcMatch -> NF_TcM s TypecheckedMatch
296 zonkMatch (Match _ pats _ grhss)
297 = zonkPats pats `thenNF_Tc` \ (new_pats, new_ids) ->
298 tcExtendGlobalValEnv (bagToList new_ids) $
299 zonkGRHSs grhss `thenNF_Tc` \ new_grhss ->
300 returnNF_Tc (Match [] new_pats Nothing new_grhss)
302 -------------------------------------------------------------------------
304 -> NF_TcM s TypecheckedGRHSs
306 zonkGRHSs (GRHSs grhss binds (Just ty))
307 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
310 zonk_grhs (GRHS guarded locn)
311 = zonkStmts guarded `thenNF_Tc` \ new_guarded ->
312 returnNF_Tc (GRHS new_guarded locn)
314 mapNF_Tc zonk_grhs grhss `thenNF_Tc` \ new_grhss ->
315 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
316 returnNF_Tc (GRHSs new_grhss new_binds (Just new_ty))
319 %************************************************************************
321 \subsection[BackSubst-HsExpr]{Running a zonkitution over a TypeCheckedExpr}
323 %************************************************************************
326 zonkExpr :: TcExpr -> NF_TcM s TypecheckedHsExpr
329 = zonkIdOcc id `thenNF_Tc` \ id' ->
330 returnNF_Tc (HsVar id')
332 zonkExpr (HsIPVar id)
333 = zonkIdOcc id `thenNF_Tc` \ id' ->
334 returnNF_Tc (HsIPVar id')
336 zonkExpr (HsLit _) = panic "zonkExpr:HsLit"
338 zonkExpr (HsLitOut lit ty)
339 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
340 returnNF_Tc (HsLitOut lit new_ty)
342 zonkExpr (HsLam match)
343 = zonkMatch match `thenNF_Tc` \ new_match ->
344 returnNF_Tc (HsLam new_match)
346 zonkExpr (HsApp e1 e2)
347 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
348 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
349 returnNF_Tc (HsApp new_e1 new_e2)
351 zonkExpr (OpApp e1 op fixity e2)
352 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
353 zonkExpr op `thenNF_Tc` \ new_op ->
354 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
355 returnNF_Tc (OpApp new_e1 new_op fixity new_e2)
357 zonkExpr (NegApp _ _) = panic "zonkExpr: NegApp"
358 zonkExpr (HsPar _) = panic "zonkExpr: HsPar"
360 zonkExpr (SectionL expr op)
361 = zonkExpr expr `thenNF_Tc` \ new_expr ->
362 zonkExpr op `thenNF_Tc` \ new_op ->
363 returnNF_Tc (SectionL new_expr new_op)
365 zonkExpr (SectionR op expr)
366 = zonkExpr op `thenNF_Tc` \ new_op ->
367 zonkExpr expr `thenNF_Tc` \ new_expr ->
368 returnNF_Tc (SectionR new_op new_expr)
370 zonkExpr (HsCase expr ms src_loc)
371 = zonkExpr expr `thenNF_Tc` \ new_expr ->
372 mapNF_Tc zonkMatch ms `thenNF_Tc` \ new_ms ->
373 returnNF_Tc (HsCase new_expr new_ms src_loc)
375 zonkExpr (HsIf e1 e2 e3 src_loc)
376 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
377 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
378 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
379 returnNF_Tc (HsIf new_e1 new_e2 new_e3 src_loc)
381 zonkExpr (HsLet binds expr)
382 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
384 zonkExpr expr `thenNF_Tc` \ new_expr ->
385 returnNF_Tc (HsLet new_binds new_expr)
387 zonkExpr (HsWith expr binds)
388 = zonkExpr expr `thenNF_Tc` \ new_expr ->
389 zonkIPBinds binds `thenNF_Tc` \ new_binds ->
390 returnNF_Tc (HsWith new_expr new_binds)
392 zonkIPBinds = mapNF_Tc zonkIPBind
394 zonkExpr e `thenNF_Tc` \ e' ->
397 zonkExpr (HsDo _ _ _) = panic "zonkExpr:HsDo"
399 zonkExpr (HsDoOut do_or_lc stmts return_id then_id zero_id ty src_loc)
400 = zonkStmts stmts `thenNF_Tc` \ new_stmts ->
401 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
402 zonkIdOcc return_id `thenNF_Tc` \ new_return_id ->
403 zonkIdOcc then_id `thenNF_Tc` \ new_then_id ->
404 zonkIdOcc zero_id `thenNF_Tc` \ new_zero_id ->
405 returnNF_Tc (HsDoOut do_or_lc new_stmts new_return_id new_then_id new_zero_id
408 zonkExpr (ExplicitList _) = panic "zonkExpr:ExplicitList"
410 zonkExpr (ExplicitListOut ty exprs)
411 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
412 mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
413 returnNF_Tc (ExplicitListOut new_ty new_exprs)
415 zonkExpr (ExplicitTuple exprs boxed)
416 = mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
417 returnNF_Tc (ExplicitTuple new_exprs boxed)
419 zonkExpr (RecordConOut data_con con_expr rbinds)
420 = zonkExpr con_expr `thenNF_Tc` \ new_con_expr ->
421 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
422 returnNF_Tc (RecordConOut data_con new_con_expr new_rbinds)
424 zonkExpr (RecordUpd _ _) = panic "zonkExpr:RecordUpd"
426 zonkExpr (RecordUpdOut expr ty dicts rbinds)
427 = zonkExpr expr `thenNF_Tc` \ new_expr ->
428 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
429 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
430 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
431 returnNF_Tc (RecordUpdOut new_expr new_ty new_dicts new_rbinds)
433 zonkExpr (ExprWithTySig _ _) = panic "zonkExpr:ExprWithTySig"
434 zonkExpr (ArithSeqIn _) = panic "zonkExpr:ArithSeqIn"
436 zonkExpr (ArithSeqOut expr info)
437 = zonkExpr expr `thenNF_Tc` \ new_expr ->
438 zonkArithSeq info `thenNF_Tc` \ new_info ->
439 returnNF_Tc (ArithSeqOut new_expr new_info)
441 zonkExpr (HsCCall fun args may_gc is_casm result_ty)
442 = mapNF_Tc zonkExpr args `thenNF_Tc` \ new_args ->
443 zonkTcTypeToType result_ty `thenNF_Tc` \ new_result_ty ->
444 returnNF_Tc (HsCCall fun new_args may_gc is_casm new_result_ty)
446 zonkExpr (HsSCC lbl expr)
447 = zonkExpr expr `thenNF_Tc` \ new_expr ->
448 returnNF_Tc (HsSCC lbl new_expr)
450 zonkExpr (TyLam tyvars expr)
451 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
452 -- No need to extend tyvar env; see AbsBinds
454 zonkExpr expr `thenNF_Tc` \ new_expr ->
455 returnNF_Tc (TyLam new_tyvars new_expr)
457 zonkExpr (TyApp expr tys)
458 = zonkExpr expr `thenNF_Tc` \ new_expr ->
459 mapNF_Tc zonkTcTypeToType tys `thenNF_Tc` \ new_tys ->
460 returnNF_Tc (TyApp new_expr new_tys)
462 zonkExpr (DictLam dicts expr)
463 = mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
464 tcExtendGlobalValEnv new_dicts $
465 zonkExpr expr `thenNF_Tc` \ new_expr ->
466 returnNF_Tc (DictLam new_dicts new_expr)
468 zonkExpr (DictApp expr dicts)
469 = zonkExpr expr `thenNF_Tc` \ new_expr ->
470 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
471 returnNF_Tc (DictApp new_expr new_dicts)
475 -------------------------------------------------------------------------
476 zonkArithSeq :: TcArithSeqInfo -> NF_TcM s TypecheckedArithSeqInfo
478 zonkArithSeq (From e)
479 = zonkExpr e `thenNF_Tc` \ new_e ->
480 returnNF_Tc (From new_e)
482 zonkArithSeq (FromThen e1 e2)
483 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
484 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
485 returnNF_Tc (FromThen new_e1 new_e2)
487 zonkArithSeq (FromTo e1 e2)
488 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
489 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
490 returnNF_Tc (FromTo new_e1 new_e2)
492 zonkArithSeq (FromThenTo e1 e2 e3)
493 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
494 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
495 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
496 returnNF_Tc (FromThenTo new_e1 new_e2 new_e3)
498 -------------------------------------------------------------------------
499 zonkStmts :: [TcStmt]
500 -> NF_TcM s [TypecheckedStmt]
502 zonkStmts [] = returnNF_Tc []
504 zonkStmts [ReturnStmt expr]
505 = zonkExpr expr `thenNF_Tc` \ new_expr ->
506 returnNF_Tc [ReturnStmt new_expr]
508 zonkStmts (ExprStmt expr locn : stmts)
509 = zonkExpr expr `thenNF_Tc` \ new_expr ->
510 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
511 returnNF_Tc (ExprStmt new_expr locn : new_stmts)
513 zonkStmts (GuardStmt expr locn : stmts)
514 = zonkExpr expr `thenNF_Tc` \ new_expr ->
515 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
516 returnNF_Tc (GuardStmt new_expr locn : new_stmts)
518 zonkStmts (LetStmt binds : stmts)
519 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
521 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
522 returnNF_Tc (LetStmt new_binds : new_stmts)
524 zonkStmts (BindStmt pat expr locn : stmts)
525 = zonkExpr expr `thenNF_Tc` \ new_expr ->
526 zonkPat pat `thenNF_Tc` \ (new_pat, new_ids) ->
527 tcExtendGlobalValEnv (bagToList new_ids) $
528 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
529 returnNF_Tc (BindStmt new_pat new_expr locn : new_stmts)
533 -------------------------------------------------------------------------
534 zonkRbinds :: TcRecordBinds -> NF_TcM s TypecheckedRecordBinds
537 = mapNF_Tc zonk_rbind rbinds
539 zonk_rbind (field, expr, pun)
540 = zonkExpr expr `thenNF_Tc` \ new_expr ->
541 zonkIdOcc field `thenNF_Tc` \ new_field ->
542 returnNF_Tc (new_field, new_expr, pun)
545 %************************************************************************
547 \subsection[BackSubst-Pats]{Patterns}
549 %************************************************************************
552 zonkPat :: TcPat -> NF_TcM s (TypecheckedPat, Bag Id)
555 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
556 returnNF_Tc (WildPat new_ty, emptyBag)
559 = zonkIdBndr v `thenNF_Tc` \ new_v ->
560 returnNF_Tc (VarPat new_v, unitBag new_v)
562 zonkPat (LazyPat pat)
563 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
564 returnNF_Tc (LazyPat new_pat, ids)
566 zonkPat (AsPat n pat)
567 = zonkIdBndr n `thenNF_Tc` \ new_n ->
568 zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
569 returnNF_Tc (AsPat new_n new_pat, new_n `consBag` ids)
571 zonkPat (ListPat ty pats)
572 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
573 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
574 returnNF_Tc (ListPat new_ty new_pats, ids)
576 zonkPat (TuplePat pats boxed)
577 = zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
578 returnNF_Tc (TuplePat new_pats boxed, ids)
580 zonkPat (ConPat n ty tvs dicts pats)
581 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
582 mapNF_Tc zonkTcTyVarToTyVar tvs `thenNF_Tc` \ new_tvs ->
583 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
584 tcExtendGlobalValEnv new_dicts $
585 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
586 returnNF_Tc (ConPat n new_ty new_tvs new_dicts new_pats,
587 listToBag new_dicts `unionBags` ids)
589 zonkPat (RecPat n ty tvs dicts rpats)
590 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
591 mapNF_Tc zonkTcTyVarToTyVar tvs `thenNF_Tc` \ new_tvs ->
592 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
593 tcExtendGlobalValEnv new_dicts $
594 mapAndUnzipNF_Tc zonk_rpat rpats `thenNF_Tc` \ (new_rpats, ids_s) ->
595 returnNF_Tc (RecPat n new_ty new_tvs new_dicts new_rpats,
596 listToBag new_dicts `unionBags` unionManyBags ids_s)
598 zonk_rpat (f, pat, pun)
599 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
600 returnNF_Tc ((f, new_pat, pun), ids)
602 zonkPat (LitPat lit ty)
603 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
604 returnNF_Tc (LitPat lit new_ty, emptyBag)
606 zonkPat (NPat lit ty expr)
607 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
608 zonkExpr expr `thenNF_Tc` \ new_expr ->
609 returnNF_Tc (NPat lit new_ty new_expr, emptyBag)
611 zonkPat (NPlusKPat n k ty e1 e2)
612 = zonkIdBndr n `thenNF_Tc` \ new_n ->
613 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
614 zonkExpr e1 `thenNF_Tc` \ new_e1 ->
615 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
616 returnNF_Tc (NPlusKPat new_n k new_ty new_e1 new_e2, unitBag new_n)
618 zonkPat (DictPat ds ms)
619 = mapNF_Tc zonkIdBndr ds `thenNF_Tc` \ new_ds ->
620 mapNF_Tc zonkIdBndr ms `thenNF_Tc` \ new_ms ->
621 returnNF_Tc (DictPat new_ds new_ms,
622 listToBag new_ds `unionBags` listToBag new_ms)
626 = returnNF_Tc ([], emptyBag)
629 = zonkPat pat `thenNF_Tc` \ (pat', ids1) ->
630 zonkPats pats `thenNF_Tc` \ (pats', ids2) ->
631 returnNF_Tc (pat':pats', ids1 `unionBags` ids2)
634 %************************************************************************
636 \subsection[BackSubst-Foreign]{Foreign exports}
638 %************************************************************************
642 zonkForeignExports :: [TcForeignExportDecl] -> NF_TcM s [TypecheckedForeignDecl]
643 zonkForeignExports ls = mapNF_Tc zonkForeignExport ls
645 zonkForeignExport :: TcForeignExportDecl -> NF_TcM s (TypecheckedForeignDecl)
646 zonkForeignExport (ForeignDecl i imp_exp hs_ty ext_nm cconv src_loc) =
647 zonkIdOcc i `thenNF_Tc` \ i' ->
648 returnNF_Tc (ForeignDecl i' imp_exp undefined ext_nm cconv src_loc)
652 zonkRules :: [TcRuleDecl] -> NF_TcM s [TypecheckedRuleDecl]
653 zonkRules rs = mapNF_Tc zonkRule rs
655 zonkRule (HsRule name tyvars vars lhs rhs loc)
656 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
657 mapNF_Tc zonkIdBndr [v | RuleBndr v <- vars] `thenNF_Tc` \ new_bndrs ->
658 tcExtendGlobalValEnv new_bndrs $
659 zonkExpr lhs `thenNF_Tc` \ new_lhs ->
660 zonkExpr rhs `thenNF_Tc` \ new_rhs ->
661 returnNF_Tc (HsRule name new_tyvars (map RuleBndr new_bndrs) new_lhs new_rhs loc)
662 -- I hate this map RuleBndr stuff
664 zonkRule (IfaceRuleOut fun rule)
665 = zonkIdOcc fun `thenNF_Tc` \ fun' ->
666 returnNF_Tc (IfaceRuleOut fun' rule)