2 module ParseIface ( parseIface, IfaceStuff(..) ) where
4 #include "HsVersions.h"
6 import HsSyn -- quite a bit of stuff
7 import RdrHsSyn -- oodles of synonyms
8 import HsTypes ( mkHsForAllTy )
10 import Const ( Literal(..), mkMachInt_safe )
11 import BasicTypes ( Fixity(..), FixityDirection(..),
12 NewOrData(..), Version
14 import CostCentre ( CostCentre(..), IsCafCC(..), IsDupdCC(..) )
15 import HsPragmas ( noDataPragmas, noClassPragmas )
16 import Type ( Kind, mkArrowKind, boxedTypeKind, openTypeKind, UsageAnn(..) )
17 import IdInfo ( ArityInfo, exactArity, CprInfo(..) )
20 import RnMonad ( ImportVersion, LocalVersion, ParsedIface(..), WhatsImported(..),
21 RdrNamePragma, ExportItem, RdrAvailInfo, GenAvailInfo(..), WhetherHasOrphans
23 import Bag ( emptyBag, unitBag, snocBag )
24 import FiniteMap ( emptyFM, unitFM, addToFM, plusFM, bagToFM, FiniteMap )
25 import RdrName ( RdrName, mkRdrUnqual, mkSysQual, mkSysUnqual )
26 import Name ( OccName, Provenance )
27 import OccName ( mkSysOccFS,
28 tcName, varName, dataName, clsName, tvName,
31 import Module ( ModuleName, mkSysModuleFS )
32 import PrelMods ( mkTupNameStr, mkUbxTupNameStr )
33 import PrelInfo ( mkTupConRdrName, mkUbxTupConRdrName )
34 import SrcLoc ( SrcLoc )
46 %tokentype { IfaceToken }
47 %monad { IfM }{ thenIf }{ returnIf }
48 %lexer { lexIface } { ITeof }
51 'case' { ITcase } -- Haskell keywords
54 'default' { ITdefault }
55 'deriving' { ITderiving }
64 'instance' { ITinstance }
67 'newtype' { ITnewtype }
73 'qualified' { ITqualified }
76 '__interface' { ITinterface } -- GHC-extension keywords
77 '__export' { ITexport }
78 '__depends' { ITdepends }
79 '__forall' { ITforall }
80 '__letrec' { ITletrec }
81 '__coerce' { ITcoerce }
82 '__inline_call'{ ITinlineCall }
83 '__inline_me' { ITinlineMe }
84 '__DEFAULT' { ITdefaultbranch }
86 '__integer' { ITinteger_lit }
87 '__float' { ITfloat_lit }
88 '__rational' { ITrational_lit }
89 '__addr' { ITaddr_lit }
90 '__litlit' { ITlit_lit }
91 '__string' { ITstring_lit }
92 '__ccall' { ITccall $$ }
94 '__sccC' { ITsccAllCafs }
100 '__P' { ITspecialise }
102 '__U' { ITunfold $$ }
103 '__S' { ITstrict $$ }
105 '__M' { ITcprinfo $$ }
107 '..' { ITdotdot } -- reserved symbols
120 '/\\' { ITbiglam } -- GHC-extension symbols
122 '{' { ITocurly } -- special symbols
133 VARID { ITvarid $$ } -- identifiers
135 VARSYM { ITvarsym $$ }
136 CONSYM { ITconsym $$ }
137 QVARID { ITqvarid $$ }
138 QCONID { ITqconid $$ }
139 QVARSYM { ITqvarsym $$ }
140 QCONSYM { ITqconsym $$ }
142 PRAGMA { ITpragma $$ }
145 STRING { ITstring $$ }
146 INTEGER { ITinteger $$ }
147 RATIONAL { ITrational $$ }
149 UNKNOWN { ITunknown $$ }
152 -- iface_stuff is the main production.
153 -- It recognises (a) a whole interface file
154 -- (b) a type (so that type sigs can be parsed lazily)
155 -- (c) the IdInfo part of a signature (same reason)
157 iface_stuff :: { IfaceStuff }
158 iface_stuff : iface { let (nm, iff) = $1 in PIface nm iff }
160 | id_info { PIdInfo $1 }
161 | '__R' rules { PRules $2 }
164 iface :: { (ModuleName, ParsedIface) }
165 iface : '__interface' mod_fs INTEGER orphans checkVersion 'where'
171 { ( $2 -- Module name
173 pi_mod = fromInteger $3, -- Module version
175 pi_exports = $7, -- Exports
176 pi_usages = $8, -- Usages
177 pi_insts = $9, -- Local instances
178 pi_decls = $10, -- Decls
179 pi_rules = $11 -- Rules
182 --------------------------------------------------------------------------
184 import_part :: { [ImportVersion OccName] }
186 | import_part import_decl { $2 : $1 }
188 import_decl :: { ImportVersion OccName }
189 import_decl : 'import' mod_fs INTEGER orphans whats_imported ';'
190 { (mkSysModuleFS $2, fromInteger $3, $4, $5) }
191 -- import Foo 3 :: a 1 b 3 c 7 ; means import a,b,c from Foo
192 -- import Foo 3 ; means import all of Foo
193 -- import Foo 3 ! :: ...stuff... ; the ! means that Foo contains orphans
195 orphans :: { WhetherHasOrphans }
199 whats_imported :: { WhatsImported OccName }
200 whats_imported : { Everything }
201 | '::' name_version_pairs { Specifically $2 }
203 name_version_pairs :: { [LocalVersion OccName] }
204 name_version_pairs : { [] }
205 | name_version_pair name_version_pairs { $1 : $2 }
207 name_version_pair :: { LocalVersion OccName }
208 name_version_pair : var_occ INTEGER { ($1, fromInteger $2) }
209 | tc_occ INTEGER { ($1, fromInteger $2) }
212 --------------------------------------------------------------------------
214 exports_part :: { [ExportItem] }
215 exports_part : { [] }
216 | exports_part '__export'
217 mod_fs entities ';' { (mkSysModuleFS $3, $4) : $1 }
219 entities :: { [RdrAvailInfo] }
221 | entity entities { $1 : $2 }
223 entity :: { RdrAvailInfo }
224 entity : tc_occ { AvailTC $1 [$1] }
225 | var_occ { Avail $1 }
226 | tc_occ stuff_inside { AvailTC $1 ($1:$2) }
227 | tc_occ '|' stuff_inside { AvailTC $1 $3 }
229 stuff_inside :: { [OccName] }
230 stuff_inside : '{' val_occs '}' { $2 }
232 val_occ :: { OccName }
236 val_occs :: { [OccName] }
238 | val_occ val_occs { $1 : $2 }
241 --------------------------------------------------------------------------
243 fixity :: { FixityDirection }
244 fixity : 'infixl' { InfixL }
245 | 'infixr' { InfixR }
249 mb_fix : {-nothing-} { 9 }
250 | INTEGER { (fromInteger $1) }
252 -----------------------------------------------------------------------------
254 csigs :: { [RdrNameSig] }
256 | 'where' '{' csigs1 '}' { $3 }
258 csigs1 :: { [RdrNameSig] }
259 csigs1 : csig { [$1] }
260 | csig ';' csigs1 { $1 : $3 }
262 csig :: { RdrNameSig }
263 csig : src_loc var_name '::' type { mkClassOpSig False $2 $4 $1 }
264 | src_loc var_name '=' '::' type { mkClassOpSig True $2 $5 $1 }
266 --------------------------------------------------------------------------
268 instance_decl_part :: { [RdrNameInstDecl] }
269 instance_decl_part : {- empty -} { [] }
270 | instance_decl_part inst_decl { $2 : $1 }
272 inst_decl :: { RdrNameInstDecl }
273 inst_decl : src_loc 'instance' type '=' var_name ';'
275 EmptyMonoBinds {- No bindings -}
276 [] {- No user pragmas -}
281 --------------------------------------------------------------------------
283 decls_part :: { [(Version, RdrNameHsDecl)] }
286 | decls_part version decl ';' { ($2,$3):$1 }
288 decl :: { RdrNameHsDecl }
289 decl : src_loc var_name '::' type maybe_idinfo
290 { SigD (IfaceSig $2 $4 ($5 $2) $1) }
291 | src_loc 'type' tc_name tv_bndrs '=' type
292 { TyClD (TySynonym $3 $4 $6 $1) }
293 | src_loc 'data' decl_context tc_name tv_bndrs constrs
294 { TyClD (TyData DataType $3 $4 $5 $6 Nothing noDataPragmas $1) }
295 | src_loc 'newtype' decl_context tc_name tv_bndrs newtype_constr
296 { TyClD (TyData NewType $3 $4 $5 $6 Nothing noDataPragmas $1) }
297 | src_loc 'class' decl_context tc_name tv_bndrs csigs
298 { TyClD (mkClassDecl $3 $4 $5 $6 EmptyMonoBinds
300 | src_loc fixity mb_fix var_or_data_name
301 { FixD (FixitySig $4 (Fixity $3 $2) $1) }
303 maybe_idinfo :: { RdrName -> [HsIdInfo RdrName] }
304 maybe_idinfo : {- empty -} { \_ -> [] }
305 | src_loc PRAGMA { \x ->
306 case parseIface $2 $1 of
307 Succeeded (PIdInfo id_info) -> id_info
308 Failed err -> pprPanic "IdInfo parse failed"
312 -----------------------------------------------------------------------------
314 rules_part :: { [RdrNameRuleDecl] }
315 rules_part : {- empty -} { [] }
316 | src_loc PRAGMA { case parseIface $2 $1 of
317 Succeeded (PRules rules) -> rules
318 Failed err -> pprPanic "Rules parse failed" err
321 rules :: { [RdrNameRuleDecl] }
323 | rule ';' rules { $1:$3 }
325 rule :: { RdrNameRuleDecl }
326 rule : src_loc STRING rule_forall qvar_name
327 core_args '=' core_expr { IfaceRuleDecl $4 (UfRuleBody $2 $3 $5 $7) $1 }
329 rule_forall :: { [UfBinder RdrName] }
330 rule_forall : '__forall' '{' core_bndrs '}' { $3 }
332 -----------------------------------------------------------------------------
334 version :: { Version }
335 version : INTEGER { fromInteger $1 }
337 decl_context :: { RdrNameContext }
338 decl_context : { [] }
339 | '{' context_list1 '}' '=>' { $2 }
341 ----------------------------------------------------------------
343 constrs :: { [RdrNameConDecl] {- empty for handwritten abstract -} }
345 | '=' constrs1 { $2 }
347 constrs1 :: { [RdrNameConDecl] }
348 constrs1 : constr { [$1] }
349 | constr '|' constrs1 { $1 : $3 }
351 constr :: { RdrNameConDecl }
352 constr : src_loc ex_stuff data_name batypes { mkConDecl $3 $2 (VanillaCon $4) $1 }
353 | src_loc ex_stuff data_name '{' fields1 '}' { mkConDecl $3 $2 (RecCon $5) $1 }
354 -- We use "data_fs" so as to include ()
356 newtype_constr :: { [RdrNameConDecl] {- Empty if handwritten abstract -} }
357 newtype_constr : { [] }
358 | src_loc '=' ex_stuff data_name atype { [mkConDecl $4 $3 (NewCon $5 Nothing) $1] }
359 | src_loc '=' ex_stuff data_name '{' var_name '::' atype '}'
360 { [mkConDecl $4 $3 (NewCon $8 (Just $6)) $1] }
362 ex_stuff :: { ([HsTyVar RdrName], RdrNameContext) }
363 ex_stuff : { ([],[]) }
364 | '__forall' forall context '=>' { ($2,$3) }
366 batypes :: { [RdrNameBangType] }
368 | batype batypes { $1 : $2 }
370 batype :: { RdrNameBangType }
371 batype : atype { Unbanged $1 }
372 | '!' atype { Banged $2 }
373 | '!' '!' atype { Unpacked $3 }
375 fields1 :: { [([RdrName], RdrNameBangType)] }
376 fields1 : field { [$1] }
377 | field ',' fields1 { $1 : $3 }
379 field :: { ([RdrName], RdrNameBangType) }
380 field : var_names1 '::' type { ($1, Unbanged $3) }
381 | var_names1 '::' '!' type { ($1, Banged $4) }
382 | var_names1 '::' '!' '!' type { ($1, Unpacked $5) }
383 --------------------------------------------------------------------------
385 type :: { RdrNameHsType }
386 type : '__forall' forall context '=>' type
387 { mkHsForAllTy $2 $3 $5 }
388 | btype '->' type { MonoFunTy $1 $3 }
391 forall :: { [HsTyVar RdrName] }
392 forall : '[' tv_bndrs ']' { $2 }
394 context :: { RdrNameContext }
396 | '{' context_list1 '}' { $2 }
398 context_list1 :: { RdrNameContext }
399 context_list1 : class { [$1] }
400 | class ',' context_list1 { $1 : $3 }
402 class :: { (RdrName, [RdrNameHsType]) }
403 class : qcls_name atypes { ($1, $2) }
405 types2 :: { [RdrNameHsType] {- Two or more -} }
406 types2 : type ',' type { [$1,$3] }
407 | type ',' types2 { $1 : $3 }
409 btype :: { RdrNameHsType }
411 | btype atype { MonoTyApp $1 $2 }
412 | '__o' atype { MonoUsgTy UsOnce $2 }
413 | '__m' atype { MonoUsgTy UsMany $2 }
415 atype :: { RdrNameHsType }
416 atype : qtc_name { MonoTyVar $1 }
417 | tv_name { MonoTyVar $1 }
418 | '(' types2 ')' { MonoTupleTy $2 True{-boxed-} }
419 | '(#' type '#)' { MonoTupleTy [$2] False{-unboxed-} }
420 | '(#' types2 '#)' { MonoTupleTy $2 False{-unboxed-} }
421 | '[' type ']' { MonoListTy $2 }
422 | '{' qcls_name atypes '}' { MonoDictTy $2 $3 }
423 | '(' type ')' { $2 }
425 -- This one is dealt with via qtc_name
426 -- | '(' ')' { MonoTupleTy [] True }
428 atypes :: { [RdrNameHsType] {- Zero or more -} }
430 | atype atypes { $1 : $2 }
431 ---------------------------------------------------------------------
432 mod_fs :: { EncodedFS }
435 mod_name :: { ModuleName }
436 : mod_fs { mkSysModuleFS $1 }
439 ---------------------------------------------------
440 var_fs :: { EncodedFS }
447 qvar_fs :: { (EncodedFS, EncodedFS) }
451 var_occ :: { OccName }
452 : var_fs { mkSysOccFS varName $1 }
454 var_name :: { RdrName }
455 var_name : var_occ { mkRdrUnqual $1 }
457 qvar_name :: { RdrName }
458 qvar_name : var_name { $1 }
459 | qvar_fs { mkSysQual varName $1 }
461 var_names :: { [RdrName] }
463 | var_name var_names { $1 : $2 }
465 var_names1 :: { [RdrName] }
466 var_names1 : var_name var_names { $1 : $2 }
468 ---------------------------------------------------
469 -- For some bizarre reason,
470 -- (,,,) is dealt with by the parser
471 -- Foo.(,,,) is dealt with by the lexer
474 data_fs :: { EncodedFS }
478 qdata_fs :: { (EncodedFS, EncodedFS) }
482 data_occ :: { OccName }
483 : data_fs { mkSysOccFS dataName $1 }
485 data_name :: { RdrName }
486 : data_occ { mkRdrUnqual $1 }
488 qdata_name :: { RdrName }
489 qdata_name : data_name { $1 }
490 | qdata_fs { mkSysQual dataName $1 }
492 qdata_names :: { [RdrName] }
494 | qdata_name qdata_names { $1 : $2 }
496 var_or_data_name :: { RdrName }
500 ---------------------------------------------------
501 tc_fs :: { EncodedFS }
504 tc_occ :: { OccName }
505 : tc_fs { mkSysOccFS tcName $1 }
507 tc_name :: { RdrName }
508 : tc_occ { mkRdrUnqual $1 }
510 qtc_name :: { RdrName }
512 | qdata_fs { mkSysQual tcName $1 }
514 ---------------------------------------------------
515 cls_name :: { RdrName }
516 : data_fs { mkSysUnqual clsName $1 }
518 qcls_name :: { RdrName }
520 | qdata_fs { mkSysQual clsName $1 }
522 ---------------------------------------------------
523 tv_name :: { RdrName }
524 : VARID { mkSysUnqual tvName $1 }
525 | VARSYM { mkSysUnqual tvName $1 {- Allow t2 as a tyvar -} }
527 tv_bndr :: { HsTyVar RdrName }
528 : tv_name '::' akind { IfaceTyVar $1 $3 }
529 | tv_name { IfaceTyVar $1 boxedTypeKind }
531 tv_bndrs :: { [HsTyVar RdrName] }
533 | tv_bndr tv_bndrs { $1 : $2 }
535 ---------------------------------------------------
538 | akind '->' kind { mkArrowKind $1 $3 }
541 : VARSYM { if $1 == SLIT("*") then
543 else if $1 == SLIT("?") then
545 else panic "ParseInterface: akind"
547 | '(' kind ')' { $2 }
549 --------------------------------------------------------------------------
551 id_info :: { [HsIdInfo RdrName] }
553 | id_info_item id_info { $1 : $2 }
554 | strict_info id_info { $1 ++ $2 }
556 id_info_item :: { HsIdInfo RdrName }
557 : '__A' arity_info { HsArity $2 }
558 | '__U' core_expr { HsUnfold $1 (Just $2) }
559 | '__U' { HsUnfold $1 Nothing }
560 | '__C' { HsNoCafRefs }
562 strict_info :: { [HsIdInfo RdrName] }
563 : cpr worker { ($1:$2) }
564 | strict worker { ($1:$2) }
565 | cpr strict worker { ($1:$2:$3) }
567 cpr :: { HsIdInfo RdrName }
568 : '__M' { HsCprInfo $1 }
570 strict :: { HsIdInfo RdrName }
571 : '__S' { HsStrictness (HsStrictnessInfo $1) }
573 worker :: { [HsIdInfo RdrName] }
574 : qvar_name { [HsWorker $1] }
575 | {- nothing -} { [] }
577 arity_info :: { ArityInfo }
578 : INTEGER { exactArity (fromInteger $1) }
580 -------------------------------------------------------
581 core_expr :: { UfExpr RdrName }
582 core_expr : '\\' core_bndrs '->' core_expr { foldr UfLam $4 $2 }
583 | 'case' core_expr 'of' var_name
584 '{' core_alts '}' { UfCase $2 $4 $6 }
586 | 'let' '{' core_val_bndr '=' core_expr
587 '}' 'in' core_expr { UfLet (UfNonRec $3 $5) $8 }
588 | '__letrec' '{' rec_binds '}'
589 'in' core_expr { UfLet (UfRec $3) $6 }
591 | con_or_primop '{' core_args '}' { UfCon $1 $3 }
592 | '__litlit' STRING atype { UfCon (UfLitLitCon $2 $3) [] }
594 | '__inline_me' core_expr { UfNote UfInlineMe $2 }
595 | '__inline_call' core_expr { UfNote UfInlineCall $2 }
596 | '__coerce' atype core_expr { UfNote (UfCoerce $2) $3 }
597 | scc core_expr { UfNote (UfSCC $1) $2 }
600 fexpr :: { UfExpr RdrName }
601 fexpr : fexpr core_arg { UfApp $1 $2 }
604 core_arg :: { UfExpr RdrName }
605 : '@' atype { UfType $2 }
608 core_args :: { [UfExpr RdrName] }
610 | core_arg core_args { $1 : $2 }
612 core_aexpr :: { UfExpr RdrName } -- Atomic expressions
613 core_aexpr : qvar_name { UfVar $1 }
615 | qdata_name { UfVar $1 }
616 -- This one means that e.g. "True" will parse as
617 -- (UfVar True_Id) rather than (UfCon True_Con []).
618 -- No big deal; it'll be inlined in a jiffy. I tried
619 -- parsing it to (Con con []) directly, but got bitten
620 -- when a real constructor Id showed up in an interface
621 -- file. As usual, a hack bites you in the end.
622 -- If you want to get a UfCon, then use the
623 -- curly-bracket notation (True {}).
625 | core_lit { UfCon (UfLitCon $1) [] }
626 | '(' core_expr ')' { $2 }
627 | '(' comma_exprs2 ')' { UfTuple (mkTupConRdrName (length $2)) $2 }
628 | '(#' core_expr '#)' { UfTuple (mkUbxTupConRdrName 1) [$2] }
629 | '(#' comma_exprs2 '#)' { UfTuple (mkUbxTupConRdrName (length $2)) $2 }
631 -- This one is dealt with by qdata_name: see above comments
632 -- | '(' ')' { UfTuple (mkTupConRdrName 0) [] }
634 comma_exprs2 :: { [UfExpr RdrName] } -- Two or more
635 comma_exprs2 : core_expr ',' core_expr { [$1,$3] }
636 | core_expr ',' comma_exprs2 { $1 : $3 }
638 con_or_primop :: { UfCon RdrName }
639 con_or_primop : qdata_name { UfDataCon $1 }
640 | qvar_name { UfPrimOp $1 }
641 | '__ccall' ccall_string { let
642 (is_dyn, is_casm, may_gc) = $1
644 UfCCallOp $2 is_dyn is_casm may_gc
647 rec_binds :: { [(UfBinder RdrName, UfExpr RdrName)] }
649 | core_val_bndr '=' core_expr ';' rec_binds { ($1,$3) : $5 }
651 core_alts :: { [UfAlt RdrName] }
653 | core_alt ';' core_alts { $1 : $3 }
655 core_alt :: { UfAlt RdrName }
656 core_alt : core_pat '->' core_expr { (fst $1, snd $1, $3) }
658 core_pat :: { (UfCon RdrName, [RdrName]) }
659 core_pat : core_lit { (UfLitCon $1, []) }
660 | '__litlit' STRING atype { (UfLitLitCon $2 $3, []) }
661 | qdata_name var_names { (UfDataCon $1, $2) }
662 | '(' comma_var_names1 ')' { (UfDataCon (mkTupConRdrName (length $2)), $2) }
663 | '(#' comma_var_names1 '#)' { (UfDataCon (mkUbxTupConRdrName (length $2)), $2) }
664 | '__DEFAULT' { (UfDefault, []) }
665 | '(' core_pat ')' { $2 }
668 comma_var_names1 :: { [RdrName] } -- One or more
669 comma_var_names1 : var_name { [$1] }
670 | var_name ',' comma_var_names1 { $1 : $3 }
672 core_lit :: { Literal }
673 core_lit : INTEGER { mkMachInt_safe $1 }
674 | CHAR { MachChar $1 }
675 | STRING { MachStr $1 }
676 | '__string' STRING { NoRepStr $2 (panic "NoRepStr type") }
677 | RATIONAL { MachDouble $1 }
678 | '__float' RATIONAL { MachFloat $2 }
680 | '__integer' INTEGER { NoRepInteger $2 (panic "NoRepInteger type")
681 -- The type checker will add the types
684 | '__rational' INTEGER INTEGER { NoRepRational ($2 % $3)
685 (panic "NoRepRational type")
686 -- The type checker will add the type
689 | '__addr' INTEGER { MachAddr $2 }
691 core_bndr :: { UfBinder RdrName }
692 core_bndr : core_val_bndr { $1 }
693 | core_tv_bndr { $1 }
695 core_bndrs :: { [UfBinder RdrName] }
697 | core_bndr core_bndrs { $1 : $2 }
699 core_val_bndr :: { UfBinder RdrName }
700 core_val_bndr : var_name '::' atype { UfValBinder $1 $3 }
702 core_tv_bndr :: { UfBinder RdrName }
703 core_tv_bndr : '@' tv_name '::' akind { UfTyBinder $2 $4 }
704 | '@' tv_name { UfTyBinder $2 boxedTypeKind }
706 ccall_string :: { FAST_STRING }
711 ------------------------------------------------------------------------
712 scc :: { CostCentre }
713 : '__sccC' '{' mod_name STRING '}' { AllCafsCC $3 $4 }
714 | '__scc' '{' cc_name mod_name STRING cc_dup cc_caf '}'
715 { NormalCC { cc_name = $3, cc_mod = $4, cc_grp = $5,
716 cc_is_dupd = $6, cc_is_caf = $7 } }
718 cc_name :: { EncodedFS }
722 cc_dup :: { IsDupdCC }
723 cc_dup : { OriginalCC }
726 cc_caf :: { IsCafCC }
730 -------------------------------------------------------------------
732 src_loc :: { SrcLoc }
733 src_loc : {% getSrcLocIf }
735 checkVersion :: { () }
736 : {-empty-} {% checkVersion Nothing }
737 | INTEGER {% checkVersion (Just (fromInteger $1)) }
739 -------------------------------------------------------------------
744 data IfaceStuff = PIface EncodedFS{-.hi module name-} ParsedIface
745 | PIdInfo [HsIdInfo RdrName]
746 | PType RdrNameHsType
747 | PRules [RdrNameRuleDecl]
749 mkConDecl name (ex_tvs, ex_ctxt) details loc = ConDecl name ex_tvs ex_ctxt details loc