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 ( dataConWrapId )
44 import TcEnv ( tcLookupGlobal_maybe, tcExtendGlobalValEnv,
49 import TcType ( zonkTcTypeToType, zonkTcTyVarToTyVar, zonkTcType, zonkTcSigTyVars
51 import Name ( isLocallyDefined )
52 import CoreSyn ( Expr )
53 import CoreUnfold( unfoldingTemplate )
54 import BasicTypes ( RecFlag(..) )
57 import HscTypes ( TyThing(..) )
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 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 Id
163 = zonkTcTypeToType (idType id) `thenNF_Tc` \ ty' ->
164 returnNF_Tc (setIdType id ty')
166 zonkIdOcc :: TcId -> NF_TcM 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 = tcLookupGlobal_maybe (idName id) `thenNF_Tc` \ maybe_id' ->
177 new_id = case maybe_id' of
178 Just (AnId id') -> id'
179 other -> pprTrace "zonkIdOcc: " (ppr id) id
186 zonkTopBinds :: TcMonoBinds -> NF_TcM (TypecheckedMonoBinds, TcEnv)
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 tcGetEnv `thenNF_Tc` \ env ->
192 returnNF_Tc ((binds', env), new_ids)
193 ) `thenNF_Tc` \ (stuff, _) ->
196 zonkBinds :: TcHsBinds -> NF_TcM (TypecheckedHsBinds, TcEnv)
199 = go binds (\ binds' -> tcGetEnv `thenNF_Tc` \ env ->
200 returnNF_Tc (binds', env))
203 -- -> (TypecheckedHsBinds
204 -- -> NF_TcM (TypecheckedHsBinds, TcEnv)
206 -- -> NF_TcM (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 (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 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 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 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 (HsRat f ty))
337 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
338 returnNF_Tc (HsLit (HsRat f new_ty))
340 zonkExpr (HsLit (HsLitLit lit ty))
341 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
342 returnNF_Tc (HsLit (HsLitLit lit new_ty))
345 = returnNF_Tc (HsLit lit)
347 -- HsOverLit doesn't appear in typechecker output
349 zonkExpr (HsLam match)
350 = zonkMatch match `thenNF_Tc` \ new_match ->
351 returnNF_Tc (HsLam new_match)
353 zonkExpr (HsApp e1 e2)
354 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
355 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
356 returnNF_Tc (HsApp new_e1 new_e2)
358 zonkExpr (OpApp e1 op fixity e2)
359 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
360 zonkExpr op `thenNF_Tc` \ new_op ->
361 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
362 returnNF_Tc (OpApp new_e1 new_op fixity new_e2)
364 zonkExpr (NegApp _ _) = panic "zonkExpr: NegApp"
365 zonkExpr (HsPar _) = panic "zonkExpr: HsPar"
367 zonkExpr (SectionL expr op)
368 = zonkExpr expr `thenNF_Tc` \ new_expr ->
369 zonkExpr op `thenNF_Tc` \ new_op ->
370 returnNF_Tc (SectionL new_expr new_op)
372 zonkExpr (SectionR op expr)
373 = zonkExpr op `thenNF_Tc` \ new_op ->
374 zonkExpr expr `thenNF_Tc` \ new_expr ->
375 returnNF_Tc (SectionR new_op new_expr)
377 zonkExpr (HsCase expr ms src_loc)
378 = zonkExpr expr `thenNF_Tc` \ new_expr ->
379 mapNF_Tc zonkMatch ms `thenNF_Tc` \ new_ms ->
380 returnNF_Tc (HsCase new_expr new_ms src_loc)
382 zonkExpr (HsIf e1 e2 e3 src_loc)
383 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
384 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
385 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
386 returnNF_Tc (HsIf new_e1 new_e2 new_e3 src_loc)
388 zonkExpr (HsLet binds expr)
389 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
391 zonkExpr expr `thenNF_Tc` \ new_expr ->
392 returnNF_Tc (HsLet new_binds new_expr)
394 zonkExpr (HsWith expr binds)
395 = zonkIPBinds binds `thenNF_Tc` \ new_binds ->
396 tcExtendGlobalValEnv (map fst new_binds) $
397 zonkExpr expr `thenNF_Tc` \ new_expr ->
398 returnNF_Tc (HsWith new_expr new_binds)
400 zonkIPBinds = mapNF_Tc zonkIPBind
402 zonkIdBndr n `thenNF_Tc` \ n' ->
403 zonkExpr e `thenNF_Tc` \ e' ->
406 zonkExpr (HsDo _ _ _) = panic "zonkExpr:HsDo"
408 zonkExpr (HsDoOut do_or_lc stmts return_id then_id zero_id ty src_loc)
409 = zonkStmts stmts `thenNF_Tc` \ new_stmts ->
410 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
411 zonkIdOcc return_id `thenNF_Tc` \ new_return_id ->
412 zonkIdOcc then_id `thenNF_Tc` \ new_then_id ->
413 zonkIdOcc zero_id `thenNF_Tc` \ new_zero_id ->
414 returnNF_Tc (HsDoOut do_or_lc new_stmts new_return_id new_then_id new_zero_id
417 zonkExpr (ExplicitList _) = panic "zonkExpr:ExplicitList"
419 zonkExpr (ExplicitListOut ty exprs)
420 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
421 mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
422 returnNF_Tc (ExplicitListOut new_ty new_exprs)
424 zonkExpr (ExplicitTuple exprs boxed)
425 = mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
426 returnNF_Tc (ExplicitTuple new_exprs boxed)
428 zonkExpr (RecordConOut data_con con_expr rbinds)
429 = zonkExpr con_expr `thenNF_Tc` \ new_con_expr ->
430 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
431 returnNF_Tc (RecordConOut data_con new_con_expr new_rbinds)
433 zonkExpr (RecordUpd _ _) = panic "zonkExpr:RecordUpd"
435 zonkExpr (RecordUpdOut expr ty dicts rbinds)
436 = zonkExpr expr `thenNF_Tc` \ new_expr ->
437 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
438 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
439 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
440 returnNF_Tc (RecordUpdOut new_expr new_ty new_dicts new_rbinds)
442 zonkExpr (ExprWithTySig _ _) = panic "zonkExpr:ExprWithTySig"
443 zonkExpr (ArithSeqIn _) = panic "zonkExpr:ArithSeqIn"
445 zonkExpr (ArithSeqOut expr info)
446 = zonkExpr expr `thenNF_Tc` \ new_expr ->
447 zonkArithSeq info `thenNF_Tc` \ new_info ->
448 returnNF_Tc (ArithSeqOut new_expr new_info)
450 zonkExpr (HsCCall fun args may_gc is_casm result_ty)
451 = mapNF_Tc zonkExpr args `thenNF_Tc` \ new_args ->
452 zonkTcTypeToType result_ty `thenNF_Tc` \ new_result_ty ->
453 returnNF_Tc (HsCCall fun new_args may_gc is_casm new_result_ty)
455 zonkExpr (HsSCC lbl expr)
456 = zonkExpr expr `thenNF_Tc` \ new_expr ->
457 returnNF_Tc (HsSCC lbl new_expr)
459 zonkExpr (TyLam tyvars expr)
460 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
461 -- No need to extend tyvar env; see AbsBinds
463 zonkExpr expr `thenNF_Tc` \ new_expr ->
464 returnNF_Tc (TyLam new_tyvars new_expr)
466 zonkExpr (TyApp expr tys)
467 = zonkExpr expr `thenNF_Tc` \ new_expr ->
468 mapNF_Tc zonkTcTypeToType tys `thenNF_Tc` \ new_tys ->
469 returnNF_Tc (TyApp new_expr new_tys)
471 zonkExpr (DictLam dicts expr)
472 = mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
473 tcExtendGlobalValEnv new_dicts $
474 zonkExpr expr `thenNF_Tc` \ new_expr ->
475 returnNF_Tc (DictLam new_dicts new_expr)
477 zonkExpr (DictApp expr dicts)
478 = zonkExpr expr `thenNF_Tc` \ new_expr ->
479 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
480 returnNF_Tc (DictApp new_expr new_dicts)
484 -------------------------------------------------------------------------
485 zonkArithSeq :: TcArithSeqInfo -> NF_TcM TypecheckedArithSeqInfo
487 zonkArithSeq (From e)
488 = zonkExpr e `thenNF_Tc` \ new_e ->
489 returnNF_Tc (From new_e)
491 zonkArithSeq (FromThen e1 e2)
492 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
493 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
494 returnNF_Tc (FromThen new_e1 new_e2)
496 zonkArithSeq (FromTo e1 e2)
497 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
498 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
499 returnNF_Tc (FromTo new_e1 new_e2)
501 zonkArithSeq (FromThenTo e1 e2 e3)
502 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
503 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
504 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
505 returnNF_Tc (FromThenTo new_e1 new_e2 new_e3)
507 -------------------------------------------------------------------------
508 zonkStmts :: [TcStmt]
509 -> NF_TcM [TypecheckedStmt]
511 zonkStmts [] = returnNF_Tc []
513 zonkStmts [ReturnStmt expr]
514 = zonkExpr expr `thenNF_Tc` \ new_expr ->
515 returnNF_Tc [ReturnStmt new_expr]
517 zonkStmts (ExprStmt expr locn : stmts)
518 = zonkExpr expr `thenNF_Tc` \ new_expr ->
519 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
520 returnNF_Tc (ExprStmt new_expr locn : new_stmts)
522 zonkStmts (GuardStmt expr locn : stmts)
523 = zonkExpr expr `thenNF_Tc` \ new_expr ->
524 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
525 returnNF_Tc (GuardStmt new_expr locn : new_stmts)
527 zonkStmts (LetStmt binds : stmts)
528 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
530 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
531 returnNF_Tc (LetStmt new_binds : new_stmts)
533 zonkStmts (BindStmt pat expr locn : stmts)
534 = zonkExpr expr `thenNF_Tc` \ new_expr ->
535 zonkPat pat `thenNF_Tc` \ (new_pat, new_ids) ->
536 tcExtendGlobalValEnv (bagToList new_ids) $
537 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
538 returnNF_Tc (BindStmt new_pat new_expr locn : new_stmts)
542 -------------------------------------------------------------------------
543 zonkRbinds :: TcRecordBinds -> NF_TcM TypecheckedRecordBinds
546 = mapNF_Tc zonk_rbind rbinds
548 zonk_rbind (field, expr, pun)
549 = zonkExpr expr `thenNF_Tc` \ new_expr ->
550 zonkIdOcc field `thenNF_Tc` \ new_field ->
551 returnNF_Tc (new_field, new_expr, pun)
554 %************************************************************************
556 \subsection[BackSubst-Pats]{Patterns}
558 %************************************************************************
561 zonkPat :: TcPat -> NF_TcM (TypecheckedPat, Bag Id)
564 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
565 returnNF_Tc (WildPat new_ty, emptyBag)
568 = zonkIdBndr v `thenNF_Tc` \ new_v ->
569 returnNF_Tc (VarPat new_v, unitBag new_v)
571 zonkPat (LazyPat pat)
572 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
573 returnNF_Tc (LazyPat new_pat, ids)
575 zonkPat (AsPat n pat)
576 = zonkIdBndr n `thenNF_Tc` \ new_n ->
577 zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
578 returnNF_Tc (AsPat new_n new_pat, new_n `consBag` ids)
580 zonkPat (ListPat ty pats)
581 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
582 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
583 returnNF_Tc (ListPat new_ty new_pats, ids)
585 zonkPat (TuplePat pats boxed)
586 = zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
587 returnNF_Tc (TuplePat new_pats boxed, ids)
589 zonkPat (ConPat n ty tvs dicts pats)
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 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
595 returnNF_Tc (ConPat n new_ty new_tvs new_dicts new_pats,
596 listToBag new_dicts `unionBags` ids)
598 zonkPat (RecPat n ty tvs dicts rpats)
599 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
600 mapNF_Tc zonkTcTyVarToTyVar tvs `thenNF_Tc` \ new_tvs ->
601 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
602 tcExtendGlobalValEnv new_dicts $
603 mapAndUnzipNF_Tc zonk_rpat rpats `thenNF_Tc` \ (new_rpats, ids_s) ->
604 returnNF_Tc (RecPat n new_ty new_tvs new_dicts new_rpats,
605 listToBag new_dicts `unionBags` unionManyBags ids_s)
607 zonk_rpat (f, pat, pun)
608 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
609 returnNF_Tc ((f, new_pat, pun), ids)
611 zonkPat (LitPat lit ty)
612 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
613 returnNF_Tc (LitPat lit new_ty, emptyBag)
615 zonkPat (NPat lit ty expr)
616 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
617 zonkExpr expr `thenNF_Tc` \ new_expr ->
618 returnNF_Tc (NPat lit new_ty new_expr, emptyBag)
620 zonkPat (NPlusKPat n k ty e1 e2)
621 = zonkIdBndr n `thenNF_Tc` \ new_n ->
622 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
623 zonkExpr e1 `thenNF_Tc` \ new_e1 ->
624 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
625 returnNF_Tc (NPlusKPat new_n k new_ty new_e1 new_e2, unitBag new_n)
627 zonkPat (DictPat ds ms)
628 = mapNF_Tc zonkIdBndr ds `thenNF_Tc` \ new_ds ->
629 mapNF_Tc zonkIdBndr ms `thenNF_Tc` \ new_ms ->
630 returnNF_Tc (DictPat new_ds new_ms,
631 listToBag new_ds `unionBags` listToBag new_ms)
635 = returnNF_Tc ([], emptyBag)
638 = zonkPat pat `thenNF_Tc` \ (pat', ids1) ->
639 zonkPats pats `thenNF_Tc` \ (pats', ids2) ->
640 returnNF_Tc (pat':pats', ids1 `unionBags` ids2)
643 %************************************************************************
645 \subsection[BackSubst-Foreign]{Foreign exports}
647 %************************************************************************
651 zonkForeignExports :: [TcForeignExportDecl] -> NF_TcM [TypecheckedForeignDecl]
652 zonkForeignExports ls = mapNF_Tc zonkForeignExport ls
654 zonkForeignExport :: TcForeignExportDecl -> NF_TcM (TypecheckedForeignDecl)
655 zonkForeignExport (ForeignDecl i imp_exp hs_ty ext_nm cconv src_loc) =
656 zonkIdOcc i `thenNF_Tc` \ i' ->
657 returnNF_Tc (ForeignDecl i' imp_exp undefined ext_nm cconv src_loc)
661 zonkRules :: [TcRuleDecl] -> NF_TcM [TypecheckedRuleDecl]
662 zonkRules rs = mapNF_Tc zonkRule rs
664 zonkRule (HsRule name tyvars vars lhs rhs loc)
665 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
666 mapNF_Tc zonkIdBndr [v | RuleBndr v <- vars] `thenNF_Tc` \ new_bndrs ->
667 tcExtendGlobalValEnv new_bndrs $
668 zonkExpr lhs `thenNF_Tc` \ new_lhs ->
669 zonkExpr rhs `thenNF_Tc` \ new_rhs ->
670 returnNF_Tc (HsRule name new_tyvars (map RuleBndr new_bndrs) new_lhs new_rhs loc)
671 -- I hate this map RuleBndr stuff
673 zonkRule (IfaceRuleOut fun rule)
674 = zonkIdOcc fun `thenNF_Tc` \ fun' ->
675 returnNF_Tc (IfaceRuleOut fun' rule)