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, zonkTcTyVarBndr, zonkTcType
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 = mapNF_Tc zonkTcTyVarBndr tyvars `thenNF_Tc` \ new_tyvars ->
280 zonkIdBndr global `thenNF_Tc` \ new_global ->
281 zonkIdOcc local `thenNF_Tc` \ new_local ->
282 returnNF_Tc (new_tyvars, new_global, new_local)
285 %************************************************************************
287 \subsection[BackSubst-Match-GRHSs]{Match and GRHSs}
289 %************************************************************************
292 zonkMatch :: TcMatch -> NF_TcM s TypecheckedMatch
294 zonkMatch (Match _ pats _ grhss)
295 = zonkPats pats `thenNF_Tc` \ (new_pats, new_ids) ->
296 tcExtendGlobalValEnv (bagToList new_ids) $
297 zonkGRHSs grhss `thenNF_Tc` \ new_grhss ->
298 returnNF_Tc (Match [] new_pats Nothing new_grhss)
300 -------------------------------------------------------------------------
302 -> NF_TcM s TypecheckedGRHSs
304 zonkGRHSs (GRHSs grhss binds (Just ty))
305 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
308 zonk_grhs (GRHS guarded locn)
309 = zonkStmts guarded `thenNF_Tc` \ new_guarded ->
310 returnNF_Tc (GRHS new_guarded locn)
312 mapNF_Tc zonk_grhs grhss `thenNF_Tc` \ new_grhss ->
313 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
314 returnNF_Tc (GRHSs new_grhss new_binds (Just new_ty))
317 %************************************************************************
319 \subsection[BackSubst-HsExpr]{Running a zonkitution over a TypeCheckedExpr}
321 %************************************************************************
324 zonkExpr :: TcExpr -> NF_TcM s TypecheckedHsExpr
327 = zonkIdOcc id `thenNF_Tc` \ id' ->
328 returnNF_Tc (HsVar id')
330 zonkExpr (HsIPVar id)
331 = zonkIdOcc id `thenNF_Tc` \ id' ->
332 returnNF_Tc (HsIPVar id')
334 zonkExpr (HsLit _) = panic "zonkExpr:HsLit"
336 zonkExpr (HsLitOut lit ty)
337 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
338 returnNF_Tc (HsLitOut lit new_ty)
340 zonkExpr (HsLam match)
341 = zonkMatch match `thenNF_Tc` \ new_match ->
342 returnNF_Tc (HsLam new_match)
344 zonkExpr (HsApp e1 e2)
345 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
346 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
347 returnNF_Tc (HsApp new_e1 new_e2)
349 zonkExpr (OpApp e1 op fixity e2)
350 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
351 zonkExpr op `thenNF_Tc` \ new_op ->
352 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
353 returnNF_Tc (OpApp new_e1 new_op fixity new_e2)
355 zonkExpr (NegApp _ _) = panic "zonkExpr: NegApp"
356 zonkExpr (HsPar _) = panic "zonkExpr: HsPar"
358 zonkExpr (SectionL expr op)
359 = zonkExpr expr `thenNF_Tc` \ new_expr ->
360 zonkExpr op `thenNF_Tc` \ new_op ->
361 returnNF_Tc (SectionL new_expr new_op)
363 zonkExpr (SectionR op expr)
364 = zonkExpr op `thenNF_Tc` \ new_op ->
365 zonkExpr expr `thenNF_Tc` \ new_expr ->
366 returnNF_Tc (SectionR new_op new_expr)
368 zonkExpr (HsCase expr ms src_loc)
369 = zonkExpr expr `thenNF_Tc` \ new_expr ->
370 mapNF_Tc zonkMatch ms `thenNF_Tc` \ new_ms ->
371 returnNF_Tc (HsCase new_expr new_ms src_loc)
373 zonkExpr (HsIf e1 e2 e3 src_loc)
374 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
375 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
376 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
377 returnNF_Tc (HsIf new_e1 new_e2 new_e3 src_loc)
379 zonkExpr (HsLet binds expr)
380 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
382 zonkExpr expr `thenNF_Tc` \ new_expr ->
383 returnNF_Tc (HsLet new_binds new_expr)
385 zonkExpr (HsWith expr binds)
386 = zonkExpr expr `thenNF_Tc` \ new_expr ->
387 zonkIPBinds binds `thenNF_Tc` \ new_binds ->
388 returnNF_Tc (HsWith new_expr new_binds)
390 zonkIPBinds = mapNF_Tc zonkIPBind
392 zonkExpr e `thenNF_Tc` \ e' ->
395 zonkExpr (HsDo _ _ _) = panic "zonkExpr:HsDo"
397 zonkExpr (HsDoOut do_or_lc stmts return_id then_id zero_id ty src_loc)
398 = zonkStmts stmts `thenNF_Tc` \ new_stmts ->
399 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
400 zonkIdOcc return_id `thenNF_Tc` \ new_return_id ->
401 zonkIdOcc then_id `thenNF_Tc` \ new_then_id ->
402 zonkIdOcc zero_id `thenNF_Tc` \ new_zero_id ->
403 returnNF_Tc (HsDoOut do_or_lc new_stmts new_return_id new_then_id new_zero_id
406 zonkExpr (ExplicitList _) = panic "zonkExpr:ExplicitList"
408 zonkExpr (ExplicitListOut ty exprs)
409 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
410 mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
411 returnNF_Tc (ExplicitListOut new_ty new_exprs)
413 zonkExpr (ExplicitTuple exprs boxed)
414 = mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
415 returnNF_Tc (ExplicitTuple new_exprs boxed)
417 zonkExpr (RecordConOut data_con con_expr rbinds)
418 = zonkExpr con_expr `thenNF_Tc` \ new_con_expr ->
419 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
420 returnNF_Tc (RecordConOut data_con new_con_expr new_rbinds)
422 zonkExpr (RecordUpd _ _) = panic "zonkExpr:RecordUpd"
424 zonkExpr (RecordUpdOut expr ty dicts rbinds)
425 = zonkExpr expr `thenNF_Tc` \ new_expr ->
426 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
427 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
428 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
429 returnNF_Tc (RecordUpdOut new_expr new_ty new_dicts new_rbinds)
431 zonkExpr (ExprWithTySig _ _) = panic "zonkExpr:ExprWithTySig"
432 zonkExpr (ArithSeqIn _) = panic "zonkExpr:ArithSeqIn"
434 zonkExpr (ArithSeqOut expr info)
435 = zonkExpr expr `thenNF_Tc` \ new_expr ->
436 zonkArithSeq info `thenNF_Tc` \ new_info ->
437 returnNF_Tc (ArithSeqOut new_expr new_info)
439 zonkExpr (HsCCall fun args may_gc is_casm result_ty)
440 = mapNF_Tc zonkExpr args `thenNF_Tc` \ new_args ->
441 zonkTcTypeToType result_ty `thenNF_Tc` \ new_result_ty ->
442 returnNF_Tc (HsCCall fun new_args may_gc is_casm new_result_ty)
444 zonkExpr (HsSCC lbl expr)
445 = zonkExpr expr `thenNF_Tc` \ new_expr ->
446 returnNF_Tc (HsSCC lbl new_expr)
448 zonkExpr (TyLam tyvars expr)
449 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
450 -- No need to extend tyvar env; see AbsBinds
452 zonkExpr expr `thenNF_Tc` \ new_expr ->
453 returnNF_Tc (TyLam new_tyvars new_expr)
455 zonkExpr (TyApp expr tys)
456 = zonkExpr expr `thenNF_Tc` \ new_expr ->
457 mapNF_Tc zonkTcTypeToType tys `thenNF_Tc` \ new_tys ->
458 returnNF_Tc (TyApp new_expr new_tys)
460 zonkExpr (DictLam dicts expr)
461 = mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
462 tcExtendGlobalValEnv new_dicts $
463 zonkExpr expr `thenNF_Tc` \ new_expr ->
464 returnNF_Tc (DictLam new_dicts new_expr)
466 zonkExpr (DictApp expr dicts)
467 = zonkExpr expr `thenNF_Tc` \ new_expr ->
468 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
469 returnNF_Tc (DictApp new_expr new_dicts)
473 -------------------------------------------------------------------------
474 zonkArithSeq :: TcArithSeqInfo -> NF_TcM s TypecheckedArithSeqInfo
476 zonkArithSeq (From e)
477 = zonkExpr e `thenNF_Tc` \ new_e ->
478 returnNF_Tc (From new_e)
480 zonkArithSeq (FromThen e1 e2)
481 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
482 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
483 returnNF_Tc (FromThen new_e1 new_e2)
485 zonkArithSeq (FromTo e1 e2)
486 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
487 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
488 returnNF_Tc (FromTo new_e1 new_e2)
490 zonkArithSeq (FromThenTo e1 e2 e3)
491 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
492 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
493 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
494 returnNF_Tc (FromThenTo new_e1 new_e2 new_e3)
496 -------------------------------------------------------------------------
497 zonkStmts :: [TcStmt]
498 -> NF_TcM s [TypecheckedStmt]
500 zonkStmts [] = returnNF_Tc []
502 zonkStmts [ReturnStmt expr]
503 = zonkExpr expr `thenNF_Tc` \ new_expr ->
504 returnNF_Tc [ReturnStmt new_expr]
506 zonkStmts (ExprStmt expr locn : stmts)
507 = zonkExpr expr `thenNF_Tc` \ new_expr ->
508 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
509 returnNF_Tc (ExprStmt new_expr locn : new_stmts)
511 zonkStmts (GuardStmt expr locn : stmts)
512 = zonkExpr expr `thenNF_Tc` \ new_expr ->
513 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
514 returnNF_Tc (GuardStmt new_expr locn : new_stmts)
516 zonkStmts (LetStmt binds : stmts)
517 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
519 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
520 returnNF_Tc (LetStmt new_binds : new_stmts)
522 zonkStmts (BindStmt pat expr locn : stmts)
523 = zonkExpr expr `thenNF_Tc` \ new_expr ->
524 zonkPat pat `thenNF_Tc` \ (new_pat, new_ids) ->
525 tcExtendGlobalValEnv (bagToList new_ids) $
526 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
527 returnNF_Tc (BindStmt new_pat new_expr locn : new_stmts)
531 -------------------------------------------------------------------------
532 zonkRbinds :: TcRecordBinds -> NF_TcM s TypecheckedRecordBinds
535 = mapNF_Tc zonk_rbind rbinds
537 zonk_rbind (field, expr, pun)
538 = zonkExpr expr `thenNF_Tc` \ new_expr ->
539 zonkIdOcc field `thenNF_Tc` \ new_field ->
540 returnNF_Tc (new_field, new_expr, pun)
543 %************************************************************************
545 \subsection[BackSubst-Pats]{Patterns}
547 %************************************************************************
550 zonkPat :: TcPat -> NF_TcM s (TypecheckedPat, Bag Id)
553 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
554 returnNF_Tc (WildPat new_ty, emptyBag)
557 = zonkIdBndr v `thenNF_Tc` \ new_v ->
558 returnNF_Tc (VarPat new_v, unitBag new_v)
560 zonkPat (LazyPat pat)
561 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
562 returnNF_Tc (LazyPat new_pat, ids)
564 zonkPat (AsPat n pat)
565 = zonkIdBndr n `thenNF_Tc` \ new_n ->
566 zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
567 returnNF_Tc (AsPat new_n new_pat, new_n `consBag` ids)
569 zonkPat (ListPat ty pats)
570 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
571 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
572 returnNF_Tc (ListPat new_ty new_pats, ids)
574 zonkPat (TuplePat pats boxed)
575 = zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
576 returnNF_Tc (TuplePat new_pats boxed, ids)
578 zonkPat (ConPat n ty tvs dicts pats)
579 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
580 mapNF_Tc zonkTcTyVarToTyVar tvs `thenNF_Tc` \ new_tvs ->
581 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
582 tcExtendGlobalValEnv new_dicts $
583 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
584 returnNF_Tc (ConPat n new_ty new_tvs new_dicts new_pats,
585 listToBag new_dicts `unionBags` ids)
587 zonkPat (RecPat n ty tvs dicts rpats)
588 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
589 mapNF_Tc zonkTcTyVarToTyVar tvs `thenNF_Tc` \ new_tvs ->
590 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
591 tcExtendGlobalValEnv new_dicts $
592 mapAndUnzipNF_Tc zonk_rpat rpats `thenNF_Tc` \ (new_rpats, ids_s) ->
593 returnNF_Tc (RecPat n new_ty new_tvs new_dicts new_rpats,
594 listToBag new_dicts `unionBags` unionManyBags ids_s)
596 zonk_rpat (f, pat, pun)
597 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
598 returnNF_Tc ((f, new_pat, pun), ids)
600 zonkPat (LitPat lit ty)
601 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
602 returnNF_Tc (LitPat lit new_ty, emptyBag)
604 zonkPat (NPat lit ty expr)
605 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
606 zonkExpr expr `thenNF_Tc` \ new_expr ->
607 returnNF_Tc (NPat lit new_ty new_expr, emptyBag)
609 zonkPat (NPlusKPat n k ty e1 e2)
610 = zonkIdBndr n `thenNF_Tc` \ new_n ->
611 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
612 zonkExpr e1 `thenNF_Tc` \ new_e1 ->
613 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
614 returnNF_Tc (NPlusKPat new_n k new_ty new_e1 new_e2, unitBag new_n)
616 zonkPat (DictPat ds ms)
617 = mapNF_Tc zonkIdBndr ds `thenNF_Tc` \ new_ds ->
618 mapNF_Tc zonkIdBndr ms `thenNF_Tc` \ new_ms ->
619 returnNF_Tc (DictPat new_ds new_ms,
620 listToBag new_ds `unionBags` listToBag new_ms)
624 = returnNF_Tc ([], emptyBag)
627 = zonkPat pat `thenNF_Tc` \ (pat', ids1) ->
628 zonkPats pats `thenNF_Tc` \ (pats', ids2) ->
629 returnNF_Tc (pat':pats', ids1 `unionBags` ids2)
632 %************************************************************************
634 \subsection[BackSubst-Foreign]{Foreign exports}
636 %************************************************************************
640 zonkForeignExports :: [TcForeignExportDecl] -> NF_TcM s [TypecheckedForeignDecl]
641 zonkForeignExports ls = mapNF_Tc zonkForeignExport ls
643 zonkForeignExport :: TcForeignExportDecl -> NF_TcM s (TypecheckedForeignDecl)
644 zonkForeignExport (ForeignDecl i imp_exp hs_ty ext_nm cconv src_loc) =
645 zonkIdOcc i `thenNF_Tc` \ i' ->
646 returnNF_Tc (ForeignDecl i' imp_exp undefined ext_nm cconv src_loc)
650 zonkRules :: [TcRuleDecl] -> NF_TcM s [TypecheckedRuleDecl]
651 zonkRules rs = mapNF_Tc zonkRule rs
653 zonkRule (HsRule name tyvars vars lhs rhs loc)
654 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
655 mapNF_Tc zonkIdBndr [v | RuleBndr v <- vars] `thenNF_Tc` \ new_bndrs ->
656 tcExtendGlobalValEnv new_bndrs $
657 zonkExpr lhs `thenNF_Tc` \ new_lhs ->
658 zonkExpr rhs `thenNF_Tc` \ new_rhs ->
659 returnNF_Tc (HsRule name new_tyvars (map RuleBndr new_bndrs) new_lhs new_rhs loc)
660 -- I hate this map RuleBndr stuff
662 zonkRule (IfaceRuleOut fun rule)
663 = zonkIdOcc fun `thenNF_Tc` \ fun' ->
664 returnNF_Tc (IfaceRuleOut fun' rule)