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,
26 mkHsTyLam, mkHsDictLam, mkHsLet,
28 -- re-exported from TcEnv
33 zonkTopBinds, zonkId, zonkIdOcc,
34 zonkForeignExports, zonkRules
37 #include "HsVersions.h"
40 import HsSyn -- oodles of it
43 import Id ( idName, idType, setIdType, omitIfaceSigForId, Id )
44 import DataCon ( DataCon, splitProductType_maybe )
45 import TcEnv ( tcLookupValueMaybe, tcExtendGlobalValEnv, tcGetValueEnv,
46 ValueEnv, TcId, tcInstId
50 import TcType ( TcType, TcTyVar,
51 zonkTcTypeToType, zonkTcTyVarToTyVar, zonkTcTyVarBndr, zonkTcType
53 import TyCon ( isDataTyCon )
54 import Type ( mkTyVarTy, splitAlgTyConApp_maybe, isUnLiftedType, Type )
55 import Name ( isLocallyDefined )
57 import VarEnv ( TyVarEnv, emptyVarEnv, extendVarEnvList )
58 import VarSet ( isEmptyVarSet )
59 import CoreSyn ( Expr )
60 import BasicTypes ( RecFlag(..) )
70 The @Tc...@ datatypes are the ones that apply {\em during} type checking.
71 All the types in @Tc...@ things have mutable type-variables in them for
74 At the end of type checking we zonk everything to @Typechecked...@ datatypes,
75 which have immutable type variables in them.
78 type TcHsBinds = HsBinds TcId TcPat
79 type TcMonoBinds = MonoBinds TcId TcPat
80 type TcDictBinds = TcMonoBinds
81 type TcPat = OutPat TcId
82 type TcExpr = HsExpr TcId TcPat
83 type TcGRHSs = GRHSs TcId TcPat
84 type TcGRHS = GRHS TcId TcPat
85 type TcMatch = Match TcId TcPat
86 type TcStmt = Stmt TcId TcPat
87 type TcArithSeqInfo = ArithSeqInfo TcId TcPat
88 type TcRecordBinds = HsRecordBinds TcId TcPat
89 type TcHsModule = HsModule TcId TcPat
91 type TcCoreExpr = Expr TcId
92 type TcForeignExportDecl = ForeignDecl TcId
93 type TcRuleDecl = RuleDecl TcId TcPat
95 type TypecheckedPat = OutPat Id
96 type TypecheckedMonoBinds = MonoBinds Id TypecheckedPat
97 type TypecheckedDictBinds = TypecheckedMonoBinds
98 type TypecheckedHsBinds = HsBinds Id TypecheckedPat
99 type TypecheckedHsExpr = HsExpr Id TypecheckedPat
100 type TypecheckedArithSeqInfo = ArithSeqInfo Id TypecheckedPat
101 type TypecheckedStmt = Stmt Id TypecheckedPat
102 type TypecheckedMatch = Match Id TypecheckedPat
103 type TypecheckedGRHSs = GRHSs Id TypecheckedPat
104 type TypecheckedGRHS = GRHS Id TypecheckedPat
105 type TypecheckedRecordBinds = HsRecordBinds Id TypecheckedPat
106 type TypecheckedHsModule = HsModule Id TypecheckedPat
107 type TypecheckedForeignDecl = ForeignDecl Id
108 type TypecheckedRuleDecl = RuleDecl Id TypecheckedPat
112 mkHsTyApp expr [] = expr
113 mkHsTyApp expr tys = TyApp expr tys
115 mkHsDictApp expr [] = expr
116 mkHsDictApp expr dict_vars = DictApp expr dict_vars
118 mkHsTyLam [] expr = expr
119 mkHsTyLam tyvars expr = TyLam tyvars expr
121 mkHsDictLam [] expr = expr
122 mkHsDictLam dicts expr = DictLam dicts expr
124 mkHsLet EmptyMonoBinds expr = expr
125 mkHsLet mbinds expr = HsLet (MonoBind mbinds [] Recursive) expr
128 %************************************************************************
130 \subsection[BackSubst-HsBinds]{Running a substitution over @HsBinds@}
132 %************************************************************************
134 Some gruesome hackery for desugaring ccalls. It's here because if we put it
135 in Type.lhs we get irritating loops, and it's only used by TcInstDcls.lhs and
139 maybeBoxedPrimType :: Type -> Maybe (DataCon, Type)
140 maybeBoxedPrimType ty
141 = case splitProductType_maybe ty of -- Product data type
142 Just (tycon, tys_applied, data_con, [data_con_arg_ty]) -- constr has one arg
143 | isUnLiftedType data_con_arg_ty -- which is primitive
144 -> Just (data_con, data_con_arg_ty)
146 other_cases -> Nothing
149 %************************************************************************
151 \subsection[BackSubst-HsBinds]{Running a substitution over @HsBinds@}
153 %************************************************************************
155 This zonking pass runs over the bindings
157 a) to convert TcTyVars to TyVars etc, dereferencing any bindings etc
158 b) convert unbound TcTyVar to Void
159 c) convert each TcId to an Id by zonking its type
161 The type variables are converted by binding mutable tyvars to immutable ones
162 and then zonking as normal.
164 The Ids are converted by binding them in the normal Tc envt; that
165 way we maintain sharing; eg an Id is zonked at its binding site and they
166 all occurrences of that Id point to the common zonked copy
168 It's all pretty boring stuff, because HsSyn is such a large type, and
169 the environment manipulation is tiresome.
172 -- zonkId is used *during* typechecking just to zonk the Id's type
173 zonkId :: TcId -> NF_TcM s TcId
175 = zonkTcType (idType id) `thenNF_Tc` \ ty' ->
176 returnNF_Tc (setIdType id ty')
178 -- zonkIdBndr is used *after* typechecking to get the Id's type
179 -- to its final form. The TyVarEnv give
180 zonkIdBndr :: TcId -> NF_TcM s Id
182 = zonkTcTypeToType (idType id) `thenNF_Tc` \ ty' ->
183 returnNF_Tc (setIdType id ty')
185 zonkIdOcc :: TcId -> NF_TcM s Id
187 | not (isLocallyDefined id) || omitIfaceSigForId id
188 -- The omitIfaceSigForId thing may look wierd but it's quite
189 -- sensible really. We're avoiding looking up superclass selectors
190 -- and constructors; zonking them is a no-op anyway, and the
191 -- superclass selectors aren't in the environment anyway.
194 = tcLookupValueMaybe (idName id) `thenNF_Tc` \ maybe_id' ->
196 new_id = case maybe_id' of
198 Nothing -> pprTrace "zonkIdOcc: " (ppr id) id
205 zonkTopBinds :: TcMonoBinds -> NF_TcM s (TypecheckedMonoBinds, ValueEnv)
206 zonkTopBinds binds -- Top level is implicitly recursive
207 = fixNF_Tc (\ ~(_, new_ids) ->
208 tcExtendGlobalValEnv (bagToList new_ids) $
209 zonkMonoBinds binds `thenNF_Tc` \ (binds', new_ids) ->
210 tcGetValueEnv `thenNF_Tc` \ env ->
211 returnNF_Tc ((binds', env), new_ids)
212 ) `thenNF_Tc` \ (stuff, _) ->
215 zonkBinds :: TcHsBinds -> NF_TcM s (TypecheckedHsBinds, TcEnv)
218 = go binds (\ binds' -> tcGetEnv `thenNF_Tc` \ env ->
219 returnNF_Tc (binds', env))
222 -- -> (TypecheckedHsBinds
223 -- -> NF_TcM s (TypecheckedHsBinds, TcEnv)
225 -- -> NF_TcM s (TypecheckedHsBinds, TcEnv)
227 go (ThenBinds b1 b2) thing_inside = go b1 $ \ b1' ->
229 thing_inside (b1' `ThenBinds` b2')
231 go EmptyBinds thing_inside = thing_inside EmptyBinds
233 go (MonoBind bind sigs is_rec) thing_inside
234 = ASSERT( null sigs )
235 fixNF_Tc (\ ~(_, new_ids) ->
236 tcExtendGlobalValEnv (bagToList new_ids) $
237 zonkMonoBinds bind `thenNF_Tc` \ (new_bind, new_ids) ->
238 thing_inside (MonoBind new_bind [] is_rec) `thenNF_Tc` \ stuff ->
239 returnNF_Tc (stuff, new_ids)
240 ) `thenNF_Tc` \ (stuff, _) ->
245 -------------------------------------------------------------------------
246 zonkMonoBinds :: TcMonoBinds
247 -> NF_TcM s (TypecheckedMonoBinds, Bag Id)
249 zonkMonoBinds EmptyMonoBinds = returnNF_Tc (EmptyMonoBinds, emptyBag)
251 zonkMonoBinds (AndMonoBinds mbinds1 mbinds2)
252 = zonkMonoBinds mbinds1 `thenNF_Tc` \ (b1', ids1) ->
253 zonkMonoBinds mbinds2 `thenNF_Tc` \ (b2', ids2) ->
254 returnNF_Tc (b1' `AndMonoBinds` b2',
255 ids1 `unionBags` ids2)
257 zonkMonoBinds (PatMonoBind pat grhss locn)
258 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
259 zonkGRHSs grhss `thenNF_Tc` \ new_grhss ->
260 returnNF_Tc (PatMonoBind new_pat new_grhss locn, ids)
262 zonkMonoBinds (VarMonoBind var expr)
263 = zonkIdBndr var `thenNF_Tc` \ new_var ->
264 zonkExpr expr `thenNF_Tc` \ new_expr ->
265 returnNF_Tc (VarMonoBind new_var new_expr, unitBag new_var)
267 zonkMonoBinds (CoreMonoBind var core_expr)
268 = zonkIdBndr var `thenNF_Tc` \ new_var ->
269 returnNF_Tc (CoreMonoBind new_var core_expr, unitBag new_var)
271 zonkMonoBinds (FunMonoBind var inf ms locn)
272 = zonkIdBndr var `thenNF_Tc` \ new_var ->
273 mapNF_Tc zonkMatch ms `thenNF_Tc` \ new_ms ->
274 returnNF_Tc (FunMonoBind new_var inf new_ms locn, unitBag new_var)
277 zonkMonoBinds (AbsBinds tyvars dicts exports inlines val_bind)
278 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
279 -- No need to extend tyvar env: the effects are
280 -- propagated through binding the tyvars themselves
282 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
283 tcExtendGlobalValEnv new_dicts $
285 fixNF_Tc (\ ~(_, _, val_bind_ids) ->
286 tcExtendGlobalValEnv (bagToList val_bind_ids) $
287 zonkMonoBinds val_bind `thenNF_Tc` \ (new_val_bind, val_bind_ids) ->
288 mapNF_Tc zonkExport exports `thenNF_Tc` \ new_exports ->
289 returnNF_Tc (new_val_bind, new_exports, val_bind_ids)
290 ) `thenNF_Tc ` \ (new_val_bind, new_exports, _) ->
292 new_globals = listToBag [global | (_, global, local) <- new_exports]
294 returnNF_Tc (AbsBinds new_tyvars new_dicts new_exports inlines new_val_bind,
297 zonkExport (tyvars, global, local)
298 = mapNF_Tc zonkTcTyVarBndr tyvars `thenNF_Tc` \ new_tyvars ->
299 zonkIdBndr global `thenNF_Tc` \ new_global ->
300 zonkIdOcc local `thenNF_Tc` \ new_local ->
301 returnNF_Tc (new_tyvars, new_global, new_local)
304 %************************************************************************
306 \subsection[BackSubst-Match-GRHSs]{Match and GRHSs}
308 %************************************************************************
311 zonkMatch :: TcMatch -> NF_TcM s TypecheckedMatch
313 zonkMatch (Match _ pats _ grhss)
314 = zonkPats pats `thenNF_Tc` \ (new_pats, new_ids) ->
315 tcExtendGlobalValEnv (bagToList new_ids) $
316 zonkGRHSs grhss `thenNF_Tc` \ new_grhss ->
317 returnNF_Tc (Match [] new_pats Nothing new_grhss)
319 -------------------------------------------------------------------------
321 -> NF_TcM s TypecheckedGRHSs
323 zonkGRHSs (GRHSs grhss binds (Just ty))
324 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
327 zonk_grhs (GRHS guarded locn)
328 = zonkStmts guarded `thenNF_Tc` \ new_guarded ->
329 returnNF_Tc (GRHS new_guarded locn)
331 mapNF_Tc zonk_grhs grhss `thenNF_Tc` \ new_grhss ->
332 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
333 returnNF_Tc (GRHSs new_grhss new_binds (Just new_ty))
336 %************************************************************************
338 \subsection[BackSubst-HsExpr]{Running a zonkitution over a TypeCheckedExpr}
340 %************************************************************************
343 zonkExpr :: TcExpr -> NF_TcM s TypecheckedHsExpr
346 = zonkIdOcc id `thenNF_Tc` \ id' ->
347 returnNF_Tc (HsVar id')
349 zonkExpr (HsLit _) = panic "zonkExpr:HsLit"
351 zonkExpr (HsLitOut lit ty)
352 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
353 returnNF_Tc (HsLitOut lit new_ty)
355 zonkExpr (HsLam match)
356 = zonkMatch match `thenNF_Tc` \ new_match ->
357 returnNF_Tc (HsLam new_match)
359 zonkExpr (HsApp e1 e2)
360 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
361 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
362 returnNF_Tc (HsApp new_e1 new_e2)
364 zonkExpr (OpApp e1 op fixity e2)
365 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
366 zonkExpr op `thenNF_Tc` \ new_op ->
367 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
368 returnNF_Tc (OpApp new_e1 new_op fixity new_e2)
370 zonkExpr (NegApp _ _) = panic "zonkExpr: NegApp"
371 zonkExpr (HsPar _) = panic "zonkExpr: HsPar"
373 zonkExpr (SectionL expr op)
374 = zonkExpr expr `thenNF_Tc` \ new_expr ->
375 zonkExpr op `thenNF_Tc` \ new_op ->
376 returnNF_Tc (SectionL new_expr new_op)
378 zonkExpr (SectionR op expr)
379 = zonkExpr op `thenNF_Tc` \ new_op ->
380 zonkExpr expr `thenNF_Tc` \ new_expr ->
381 returnNF_Tc (SectionR new_op new_expr)
383 zonkExpr (HsCase expr ms src_loc)
384 = zonkExpr expr `thenNF_Tc` \ new_expr ->
385 mapNF_Tc zonkMatch ms `thenNF_Tc` \ new_ms ->
386 returnNF_Tc (HsCase new_expr new_ms src_loc)
388 zonkExpr (HsIf e1 e2 e3 src_loc)
389 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
390 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
391 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
392 returnNF_Tc (HsIf new_e1 new_e2 new_e3 src_loc)
394 zonkExpr (HsLet binds expr)
395 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
397 zonkExpr expr `thenNF_Tc` \ new_expr ->
398 returnNF_Tc (HsLet new_binds new_expr)
400 zonkExpr (HsDo _ _ _) = panic "zonkExpr:HsDo"
402 zonkExpr (HsDoOut do_or_lc stmts return_id then_id zero_id ty src_loc)
403 = zonkStmts stmts `thenNF_Tc` \ new_stmts ->
404 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
405 zonkIdOcc return_id `thenNF_Tc` \ new_return_id ->
406 zonkIdOcc then_id `thenNF_Tc` \ new_then_id ->
407 zonkIdOcc zero_id `thenNF_Tc` \ new_zero_id ->
408 returnNF_Tc (HsDoOut do_or_lc new_stmts new_return_id new_then_id new_zero_id
411 zonkExpr (ExplicitList _) = panic "zonkExpr:ExplicitList"
413 zonkExpr (ExplicitListOut ty exprs)
414 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
415 mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
416 returnNF_Tc (ExplicitListOut new_ty new_exprs)
418 zonkExpr (ExplicitTuple exprs boxed)
419 = mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
420 returnNF_Tc (ExplicitTuple new_exprs boxed)
422 zonkExpr (HsCon data_con tys exprs)
423 = mapNF_Tc zonkTcTypeToType tys `thenNF_Tc` \ new_tys ->
424 mapNF_Tc zonkExpr exprs `thenNF_Tc` \ new_exprs ->
425 returnNF_Tc (HsCon data_con new_tys new_exprs)
427 zonkExpr (RecordConOut data_con con_expr rbinds)
428 = zonkExpr con_expr `thenNF_Tc` \ new_con_expr ->
429 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
430 returnNF_Tc (RecordConOut data_con new_con_expr new_rbinds)
432 zonkExpr (RecordUpd _ _) = panic "zonkExpr:RecordUpd"
434 zonkExpr (RecordUpdOut expr ty dicts rbinds)
435 = zonkExpr expr `thenNF_Tc` \ new_expr ->
436 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
437 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
438 zonkRbinds rbinds `thenNF_Tc` \ new_rbinds ->
439 returnNF_Tc (RecordUpdOut new_expr new_ty new_dicts new_rbinds)
441 zonkExpr (ExprWithTySig _ _) = panic "zonkExpr:ExprWithTySig"
442 zonkExpr (ArithSeqIn _) = panic "zonkExpr:ArithSeqIn"
444 zonkExpr (ArithSeqOut expr info)
445 = zonkExpr expr `thenNF_Tc` \ new_expr ->
446 zonkArithSeq info `thenNF_Tc` \ new_info ->
447 returnNF_Tc (ArithSeqOut new_expr new_info)
449 zonkExpr (CCall fun args may_gc is_casm result_ty)
450 = mapNF_Tc zonkExpr args `thenNF_Tc` \ new_args ->
451 zonkTcTypeToType result_ty `thenNF_Tc` \ new_result_ty ->
452 returnNF_Tc (CCall fun new_args may_gc is_casm new_result_ty)
454 zonkExpr (HsSCC lbl expr)
455 = zonkExpr expr `thenNF_Tc` \ new_expr ->
456 returnNF_Tc (HsSCC lbl new_expr)
458 zonkExpr (TyLam tyvars expr)
459 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
460 -- No need to extend tyvar env; see AbsBinds
462 zonkExpr expr `thenNF_Tc` \ new_expr ->
463 returnNF_Tc (TyLam new_tyvars new_expr)
465 zonkExpr (TyApp expr tys)
466 = zonkExpr expr `thenNF_Tc` \ new_expr ->
467 mapNF_Tc zonkTcTypeToType tys `thenNF_Tc` \ new_tys ->
468 returnNF_Tc (TyApp new_expr new_tys)
470 zonkExpr (DictLam dicts expr)
471 = mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
472 tcExtendGlobalValEnv new_dicts $
473 zonkExpr expr `thenNF_Tc` \ new_expr ->
474 returnNF_Tc (DictLam new_dicts new_expr)
476 zonkExpr (DictApp expr dicts)
477 = zonkExpr expr `thenNF_Tc` \ new_expr ->
478 mapNF_Tc zonkIdOcc dicts `thenNF_Tc` \ new_dicts ->
479 returnNF_Tc (DictApp new_expr new_dicts)
483 -------------------------------------------------------------------------
484 zonkArithSeq :: TcArithSeqInfo -> NF_TcM s TypecheckedArithSeqInfo
486 zonkArithSeq (From e)
487 = zonkExpr e `thenNF_Tc` \ new_e ->
488 returnNF_Tc (From new_e)
490 zonkArithSeq (FromThen e1 e2)
491 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
492 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
493 returnNF_Tc (FromThen new_e1 new_e2)
495 zonkArithSeq (FromTo e1 e2)
496 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
497 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
498 returnNF_Tc (FromTo new_e1 new_e2)
500 zonkArithSeq (FromThenTo e1 e2 e3)
501 = zonkExpr e1 `thenNF_Tc` \ new_e1 ->
502 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
503 zonkExpr e3 `thenNF_Tc` \ new_e3 ->
504 returnNF_Tc (FromThenTo new_e1 new_e2 new_e3)
506 -------------------------------------------------------------------------
507 zonkStmts :: [TcStmt]
508 -> NF_TcM s [TypecheckedStmt]
510 zonkStmts [] = returnNF_Tc []
512 zonkStmts [ReturnStmt expr]
513 = zonkExpr expr `thenNF_Tc` \ new_expr ->
514 returnNF_Tc [ReturnStmt new_expr]
516 zonkStmts (ExprStmt expr locn : stmts)
517 = zonkExpr expr `thenNF_Tc` \ new_expr ->
518 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
519 returnNF_Tc (ExprStmt new_expr locn : new_stmts)
521 zonkStmts (GuardStmt expr locn : stmts)
522 = zonkExpr expr `thenNF_Tc` \ new_expr ->
523 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
524 returnNF_Tc (GuardStmt new_expr locn : new_stmts)
526 zonkStmts (LetStmt binds : stmts)
527 = zonkBinds binds `thenNF_Tc` \ (new_binds, new_env) ->
529 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
530 returnNF_Tc (LetStmt new_binds : new_stmts)
532 zonkStmts (BindStmt pat expr locn : stmts)
533 = zonkExpr expr `thenNF_Tc` \ new_expr ->
534 zonkPat pat `thenNF_Tc` \ (new_pat, new_ids) ->
535 tcExtendGlobalValEnv (bagToList new_ids) $
536 zonkStmts stmts `thenNF_Tc` \ new_stmts ->
537 returnNF_Tc (BindStmt new_pat new_expr locn : new_stmts)
541 -------------------------------------------------------------------------
542 zonkRbinds :: TcRecordBinds -> NF_TcM s TypecheckedRecordBinds
545 = mapNF_Tc zonk_rbind rbinds
547 zonk_rbind (field, expr, pun)
548 = zonkExpr expr `thenNF_Tc` \ new_expr ->
549 zonkIdOcc field `thenNF_Tc` \ new_field ->
550 returnNF_Tc (new_field, new_expr, pun)
553 %************************************************************************
555 \subsection[BackSubst-Pats]{Patterns}
557 %************************************************************************
560 zonkPat :: TcPat -> NF_TcM s (TypecheckedPat, Bag Id)
563 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
564 returnNF_Tc (WildPat new_ty, emptyBag)
567 = zonkIdBndr v `thenNF_Tc` \ new_v ->
568 returnNF_Tc (VarPat new_v, unitBag new_v)
570 zonkPat (LazyPat pat)
571 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
572 returnNF_Tc (LazyPat new_pat, ids)
574 zonkPat (AsPat n pat)
575 = zonkIdBndr n `thenNF_Tc` \ new_n ->
576 zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
577 returnNF_Tc (AsPat new_n new_pat, new_n `consBag` ids)
579 zonkPat (ListPat ty pats)
580 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
581 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
582 returnNF_Tc (ListPat new_ty new_pats, ids)
584 zonkPat (TuplePat pats boxed)
585 = zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
586 returnNF_Tc (TuplePat new_pats boxed, ids)
588 zonkPat (ConPat n ty tvs dicts pats)
589 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
590 mapNF_Tc zonkTcTyVarToTyVar tvs `thenNF_Tc` \ new_tvs ->
591 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
592 tcExtendGlobalValEnv new_dicts $
593 zonkPats pats `thenNF_Tc` \ (new_pats, ids) ->
594 returnNF_Tc (ConPat n new_ty new_tvs new_dicts new_pats,
595 listToBag new_dicts `unionBags` ids)
597 zonkPat (RecPat n ty tvs dicts rpats)
598 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
599 mapNF_Tc zonkTcTyVarToTyVar tvs `thenNF_Tc` \ new_tvs ->
600 mapNF_Tc zonkIdBndr dicts `thenNF_Tc` \ new_dicts ->
601 tcExtendGlobalValEnv new_dicts $
602 mapAndUnzipNF_Tc zonk_rpat rpats `thenNF_Tc` \ (new_rpats, ids_s) ->
603 returnNF_Tc (RecPat n new_ty new_tvs new_dicts new_rpats,
604 listToBag new_dicts `unionBags` unionManyBags ids_s)
606 zonk_rpat (f, pat, pun)
607 = zonkPat pat `thenNF_Tc` \ (new_pat, ids) ->
608 returnNF_Tc ((f, new_pat, pun), ids)
610 zonkPat (LitPat lit ty)
611 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
612 returnNF_Tc (LitPat lit new_ty, emptyBag)
614 zonkPat (NPat lit ty expr)
615 = zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
616 zonkExpr expr `thenNF_Tc` \ new_expr ->
617 returnNF_Tc (NPat lit new_ty new_expr, emptyBag)
619 zonkPat (NPlusKPat n k ty e1 e2)
620 = zonkIdBndr n `thenNF_Tc` \ new_n ->
621 zonkTcTypeToType ty `thenNF_Tc` \ new_ty ->
622 zonkExpr e1 `thenNF_Tc` \ new_e1 ->
623 zonkExpr e2 `thenNF_Tc` \ new_e2 ->
624 returnNF_Tc (NPlusKPat new_n k new_ty new_e1 new_e2, unitBag new_n)
626 zonkPat (DictPat ds ms)
627 = mapNF_Tc zonkIdBndr ds `thenNF_Tc` \ new_ds ->
628 mapNF_Tc zonkIdBndr ms `thenNF_Tc` \ new_ms ->
629 returnNF_Tc (DictPat new_ds new_ms,
630 listToBag new_ds `unionBags` listToBag new_ms)
634 = returnNF_Tc ([], emptyBag)
637 = zonkPat pat `thenNF_Tc` \ (pat', ids1) ->
638 zonkPats pats `thenNF_Tc` \ (pats', ids2) ->
639 returnNF_Tc (pat':pats', ids1 `unionBags` ids2)
642 %************************************************************************
644 \subsection[BackSubst-Foreign]{Foreign exports}
646 %************************************************************************
650 zonkForeignExports :: [TcForeignExportDecl] -> NF_TcM s [TypecheckedForeignDecl]
651 zonkForeignExports ls = mapNF_Tc zonkForeignExport ls
653 zonkForeignExport :: TcForeignExportDecl -> NF_TcM s (TypecheckedForeignDecl)
654 zonkForeignExport (ForeignDecl i imp_exp hs_ty ext_nm cconv src_loc) =
655 zonkIdOcc i `thenNF_Tc` \ i' ->
656 returnNF_Tc (ForeignDecl i' imp_exp undefined ext_nm cconv src_loc)
660 zonkRules :: [TcRuleDecl] -> NF_TcM s [TypecheckedRuleDecl]
661 zonkRules rs = mapNF_Tc zonkRule rs
663 zonkRule (RuleDecl name tyvars vars lhs rhs loc)
664 = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars ->
665 mapNF_Tc zonkIdBndr [v | RuleBndr v <- vars] `thenNF_Tc` \ new_bndrs ->
666 tcExtendGlobalValEnv new_bndrs $
667 zonkExpr lhs `thenNF_Tc` \ new_lhs ->
668 zonkExpr rhs `thenNF_Tc` \ new_rhs ->
669 returnNF_Tc (RuleDecl name new_tyvars (map RuleBndr new_bndrs) new_lhs new_rhs loc)
670 -- I hate this map RuleBndr stuff
672 zonkRule (IfaceRuleDecl fun rule loc)
673 = returnNF_Tc (IfaceRuleDecl fun rule loc)