2 -----------------------------------------------------------------------------
3 $Id: Parser.y,v 1.113 2002/10/25 15:23:06 simonpj Exp $
7 Author(s): Simon Marlow, Sven Panne 1997, 1998, 1999
8 -----------------------------------------------------------------------------
12 module Parser ( parseModule, parseStmt, parseIdentifier, parseIface ) where
14 #include "HsVersions.h"
17 import HsTypes ( mkHsTupCon )
20 import HscTypes ( ParsedIface(..), IsBootInterface, noDependencies )
23 import PrelNames ( mAIN_Name, funTyConName, listTyConName,
24 parrTyConName, consDataConName, nilDataConName )
25 import TysWiredIn ( unitTyCon, unitDataCon, tupleTyCon, tupleCon )
26 import ForeignCall ( Safety(..), CExportSpec(..),
27 CCallConv(..), CCallTarget(..), defaultCCallConv,
29 import OccName ( UserFS, varName, tcName, dataName, tcClsName, tvName )
30 import TyCon ( DataConDetails(..) )
31 import SrcLoc ( SrcLoc )
33 import CmdLineOpts ( opt_SccProfilingOn, opt_InPackage )
34 import Type ( Kind, mkArrowKind, liftedTypeKind )
35 import BasicTypes ( Boxity(..), Fixity(..), FixityDirection(..), IPName(..),
36 NewOrData(..), StrictnessMark(..), Activation(..),
41 import CStrings ( CLabelString )
43 import Maybes ( orElse )
49 -----------------------------------------------------------------------------
50 Conflicts: 29 shift/reduce, [SDM 19/9/2002]
52 10 for abiguity in 'if x then y else z + 1' [State 136]
53 (shift parses as 'if x then y else (z + 1)', as per longest-parse rule)
54 10 because op might be: : - ! * . `x` VARSYM CONSYM QVARSYM QCONSYM
56 1 for ambiguity in 'if x then y else z with ?x=3' [State 136]
57 (shift parses as 'if x then y else (z with ?x=3)'
59 1 for ambiguity in 'if x then y else z :: T' [State 136]
60 (shift parses as 'if x then y else (z :: T)', as per longest-parse rule)
62 8 for ambiguity in 'e :: a `b` c'. Does this mean [States 160,246]
66 1 for ambiguity in 'let ?x ...' [State 268]
67 the parser can't tell whether the ?x is the lhs of a normal binding or
68 an implicit binding. Fortunately resolving as shift gives it the only
69 sensible meaning, namely the lhs of an implicit binding.
71 1 for ambiguity in '{-# RULES "name" [ ... #-} [State 332]
72 we don't know whether the '[' starts the activation or not: it
73 might be the start of the declaration with the activation being
76 1 for ambiguity in '{-# RULES "name" forall = ... #-}' [State 394]
77 since 'forall' is a valid variable name, we don't know whether
78 to treat a forall on the input as the beginning of a quantifier
79 or the beginning of the rule itself. Resolving to shift means
80 it's always treated as a quantifier, hence the above is disallowed.
81 This saves explicitly defining a grammar for the rule lhs that
82 doesn't include 'forall'.
84 6 for conflicts between `fdecl' and `fdeclDEPRECATED', [States 384,385]
85 which are resolved correctly, and moreover,
86 should go away when `fdeclDEPRECATED' is removed.
88 -----------------------------------------------------------------------------
92 '_' { ITunderscore } -- Haskell keywords
97 'default' { ITdefault }
98 'deriving' { ITderiving }
101 'hiding' { IThiding }
103 'import' { ITimport }
106 'infixl' { ITinfixl }
107 'infixr' { ITinfixr }
108 'instance' { ITinstance }
110 'module' { ITmodule }
111 'newtype' { ITnewtype }
113 'qualified' { ITqualified }
117 '_scc_' { ITscc } -- ToDo: remove
119 'forall' { ITforall } -- GHC extension keywords
120 'foreign' { ITforeign }
121 'export' { ITexport }
123 'dynamic' { ITdynamic }
125 'threadsafe' { ITthreadsafe }
126 'unsafe' { ITunsafe }
129 'stdcall' { ITstdcallconv }
130 'ccall' { ITccallconv }
131 'dotnet' { ITdotnet }
132 '_ccall_' { ITccall (False, False, PlayRisky) }
133 '_ccall_GC_' { ITccall (False, False, PlaySafe False) }
134 '_casm_' { ITccall (False, True, PlayRisky) }
135 '_casm_GC_' { ITccall (False, True, PlaySafe False) }
137 '{-# SPECIALISE' { ITspecialise_prag }
138 '{-# SOURCE' { ITsource_prag }
139 '{-# INLINE' { ITinline_prag }
140 '{-# NOINLINE' { ITnoinline_prag }
141 '{-# RULES' { ITrules_prag }
142 '{-# SCC' { ITscc_prag }
143 '{-# DEPRECATED' { ITdeprecated_prag }
144 '#-}' { ITclose_prag }
147 '__interface' { ITinterface } -- interface keywords
148 '__export' { IT__export }
149 '__instimport' { ITinstimport }
150 '__forall' { IT__forall }
151 '__letrec' { ITletrec }
152 '__coerce' { ITcoerce }
153 '__depends' { ITdepends }
154 '__inline' { ITinline }
155 '__DEFAULT' { ITdefaultbranch }
157 '__integer' { ITinteger_lit }
158 '__float' { ITfloat_lit }
159 '__rational' { ITrational_lit }
160 '__addr' { ITaddr_lit }
161 '__label' { ITlabel_lit }
162 '__litlit' { ITlit_lit }
163 '__string' { ITstring_lit }
164 '__ccall' { ITccall $$ }
166 '__sccC' { ITsccAllCafs }
169 '__P' { ITspecialise }
172 '__S' { ITstrict $$ }
173 '__M' { ITcprinfo $$ }
176 '..' { ITdotdot } -- reserved symbols
192 '{' { ITocurly } -- special symbols
196 vccurly { ITvccurly } -- virtual close curly (from layout)
209 VARID { ITvarid $$ } -- identifiers
211 VARSYM { ITvarsym $$ }
212 CONSYM { ITconsym $$ }
213 QVARID { ITqvarid $$ }
214 QCONID { ITqconid $$ }
215 QVARSYM { ITqvarsym $$ }
216 QCONSYM { ITqconsym $$ }
218 IPDUPVARID { ITdupipvarid $$ } -- GHC extension
219 IPSPLITVARID { ITsplitipvarid $$ } -- GHC extension
222 STRING { ITstring $$ }
223 INTEGER { ITinteger $$ }
224 RATIONAL { ITrational $$ }
226 PRIMCHAR { ITprimchar $$ }
227 PRIMSTRING { ITprimstring $$ }
228 PRIMINTEGER { ITprimint $$ }
229 PRIMFLOAT { ITprimfloat $$ }
230 PRIMDOUBLE { ITprimdouble $$ }
231 CLITLIT { ITlitlit $$ }
234 '[|' { ITopenExpQuote }
235 '[p|' { ITopenPatQuote }
236 '[t|' { ITopenTypQuote }
237 '[d|' { ITopenDecQuote }
238 '|]' { ITcloseQuote }
239 ID_SPLICE { ITidEscape $$ } -- $x
240 '$(' { ITparenEscape } -- $( exp )
241 REIFY_TYPE { ITreifyType }
242 REIFY_DECL { ITreifyDecl }
243 REIFY_FIXITY { ITreifyFixity }
245 %monad { P } { thenP } { returnP }
246 %lexer { lexer } { ITeof }
247 %name parseModule module
248 %name parseStmt maybe_stmt
249 %name parseIdentifier identifier
250 %name parseIface iface
254 -----------------------------------------------------------------------------
257 -- The place for module deprecation is really too restrictive, but if it
258 -- was allowed at its natural place just before 'module', we get an ugly
259 -- s/r conflict with the second alternative. Another solution would be the
260 -- introduction of a new pragma DEPRECATED_MODULE, but this is not very nice,
261 -- either, and DEPRECATED is only expected to be used by people who really
262 -- know what they are doing. :-)
264 module :: { RdrNameHsModule }
265 : srcloc 'module' modid maybemoddeprec maybeexports 'where' body
266 { HsModule (mkHomeModule $3) Nothing $5 (fst $7) (snd $7) $4 $1 }
268 { HsModule (mkHomeModule mAIN_Name) Nothing Nothing
269 (fst $2) (snd $2) Nothing $1 }
271 maybemoddeprec :: { Maybe DeprecTxt }
272 : '{-# DEPRECATED' STRING '#-}' { Just $2 }
273 | {- empty -} { Nothing }
275 body :: { ([RdrNameImportDecl], [RdrNameHsDecl]) }
277 | layout_on top close { $2 }
279 top :: { ([RdrNameImportDecl], [RdrNameHsDecl]) }
280 : importdecls { (reverse $1,[]) }
281 | importdecls ';' cvtopdecls { (reverse $1,$3) }
282 | cvtopdecls { ([],$1) }
284 cvtopdecls :: { [RdrNameHsDecl] }
285 : topdecls { cvTopDecls $1 }
287 -----------------------------------------------------------------------------
288 -- Interfaces (.hi-boot files)
290 iface :: { ParsedIface }
291 : 'module' modid 'where' ifacebody
294 pi_pkg = opt_InPackage,
295 pi_vers = 1, -- Module version
297 pi_exports = (1,[($2,mkIfaceExports $4)]),
298 pi_deps = noDependencies,
302 pi_decls = map (\x -> (1,x)) $4,
308 ifacebody :: { [RdrNameTyClDecl] }
309 : '{' ifacedecls '}' { $2 }
310 | layout_on ifacedecls close { $2 }
312 ifacedecls :: { [RdrNameTyClDecl] }
313 : ifacedecl ';' ifacedecls { $1 : $3 }
314 | ';' ifacedecls { $2 }
318 ifacedecl :: { RdrNameTyClDecl }
320 | srcloc var '::' sigtype { IfaceSig $2 $4 [] $1 }
322 -----------------------------------------------------------------------------
325 maybeexports :: { Maybe [RdrNameIE] }
326 : '(' exportlist ')' { Just $2 }
327 | {- empty -} { Nothing }
329 exportlist :: { [RdrNameIE] }
330 : exportlist ',' export { $3 : $1 }
331 | exportlist ',' { $1 }
335 -- No longer allow things like [] and (,,,) to be exported
336 -- They are built in syntax, always available
337 export :: { RdrNameIE }
339 | oqtycon { IEThingAbs $1 }
340 | oqtycon '(' '..' ')' { IEThingAll $1 }
341 | oqtycon '(' ')' { IEThingWith $1 [] }
342 | oqtycon '(' qcnames ')' { IEThingWith $1 (reverse $3) }
343 | 'module' modid { IEModuleContents $2 }
345 qcnames :: { [RdrName] }
346 : qcnames ',' qcname { $3 : $1 }
349 qcname :: { RdrName } -- Variable or data constructor
353 -----------------------------------------------------------------------------
354 -- Import Declarations
356 -- import decls can be *empty*, or even just a string of semicolons
357 -- whereas topdecls must contain at least one topdecl.
359 importdecls :: { [RdrNameImportDecl] }
360 : importdecls ';' importdecl { $3 : $1 }
361 | importdecls ';' { $1 }
362 | importdecl { [ $1 ] }
365 importdecl :: { RdrNameImportDecl }
366 : 'import' srcloc maybe_src optqualified modid maybeas maybeimpspec
367 { ImportDecl $5 $3 $4 $6 $7 $2 }
369 maybe_src :: { IsBootInterface }
370 : '{-# SOURCE' '#-}' { True }
371 | {- empty -} { False }
373 optqualified :: { Bool }
374 : 'qualified' { True }
375 | {- empty -} { False }
377 maybeas :: { Maybe ModuleName }
378 : 'as' modid { Just $2 }
379 | {- empty -} { Nothing }
381 maybeimpspec :: { Maybe (Bool, [RdrNameIE]) }
382 : impspec { Just $1 }
383 | {- empty -} { Nothing }
385 impspec :: { (Bool, [RdrNameIE]) }
386 : '(' exportlist ')' { (False, reverse $2) }
387 | 'hiding' '(' exportlist ')' { (True, reverse $3) }
389 -----------------------------------------------------------------------------
390 -- Fixity Declarations
394 | INTEGER {% checkPrecP (fromInteger $1) }
396 infix :: { FixityDirection }
398 | 'infixl' { InfixL }
399 | 'infixr' { InfixR }
402 : ops ',' op { $3 : $1 }
405 -----------------------------------------------------------------------------
406 -- Top-Level Declarations
408 topdecls :: { [RdrBinding] } -- Reversed
409 : topdecls ';' topdecl { $3 : $1 }
410 | topdecls ';' { $1 }
413 topdecl :: { RdrBinding }
414 : tycl_decl { RdrHsDecl (TyClD $1) }
415 | srcloc 'instance' inst_type where
416 { let (binds,sigs) = cvMonoBindsAndSigs $4
417 in RdrHsDecl (InstD (InstDecl $3 binds sigs Nothing $1)) }
418 | srcloc 'default' '(' comma_types0 ')' { RdrHsDecl (DefD (DefaultDecl $4 $1)) }
419 | 'foreign' fdecl { RdrHsDecl $2 }
420 | '{-# DEPRECATED' deprecations '#-}' { RdrBindings (reverse $2) }
421 | '{-# RULES' rules '#-}' { RdrBindings (reverse $2) }
422 | srcloc '$(' exp ')' { RdrHsDecl (SpliceD (SpliceDecl $3 $1)) }
425 tycl_decl :: { RdrNameTyClDecl }
426 : srcloc 'type' syn_hdr '=' ctype
427 -- Note ctype, not sigtype.
428 -- We allow an explicit for-all but we don't insert one
429 -- in type Foo a = (b,b)
430 -- Instead we just say b is out of scope
431 { let (tc,tvs) = $3 in TySynonym tc tvs $5 $1 }
434 | srcloc 'data' tycl_hdr constrs deriving
435 { mkTyData DataType $3 (DataCons (reverse $4)) $5 $1 }
437 | srcloc 'newtype' tycl_hdr '=' newconstr deriving
438 { mkTyData NewType $3 (DataCons [$5]) $6 $1 }
440 | srcloc 'class' tycl_hdr fds where
442 (binds,sigs) = cvMonoBindsAndSigs $5
444 mkClassDecl $3 $4 (map cvClassOpSig sigs) (Just binds) $1 }
446 syn_hdr :: { (RdrName, [RdrNameHsTyVar]) } -- We don't retain the syntax of an infix
447 -- type synonym declaration. Oh well.
448 : tycon tv_bndrs { ($1, $2) }
449 | tv_bndr tyconop tv_bndr { ($2, [$1,$3]) }
451 -- tycl_hdr parses the header of a type or class decl,
452 -- which takes the form
455 -- (Eq a, Ord b) => T a b
456 -- Rather a lot of inlining here, else we get reduce/reduce errors
457 tycl_hdr :: { (RdrNameContext, RdrName, [RdrNameHsTyVar]) }
458 : context '=>' type {% checkTyClHdr $3 `thenP` \ (tc,tvs) ->
459 returnP ($1, tc, tvs) }
460 | type {% checkTyClHdr $1 `thenP` \ (tc,tvs) ->
461 returnP ([], tc, tvs) }
463 -----------------------------------------------------------------------------
464 -- Nested declarations
466 decls :: { [RdrBinding] } -- Reversed
467 : decls ';' decl { $3 : $1 }
473 decllist :: { [RdrBinding] } -- Reversed
474 : '{' decls '}' { $2 }
475 | layout_on decls close { $2 }
477 where :: { [RdrBinding] } -- Reversed
478 -- No implicit parameters
479 : 'where' decllist { $2 }
482 binds :: { RdrNameHsBinds } -- May have implicit parameters
483 : decllist { cvBinds $1 }
484 | '{' dbinds '}' { IPBinds $2 False{-not with-} }
485 | layout_on dbinds close { IPBinds $2 False{-not with-} }
487 wherebinds :: { RdrNameHsBinds } -- May have implicit parameters
488 : 'where' binds { $2 }
489 | {- empty -} { EmptyBinds }
493 -----------------------------------------------------------------------------
494 -- Transformation Rules
496 rules :: { [RdrBinding] } -- Reversed
497 : rules ';' rule { $3 : $1 }
502 rule :: { RdrBinding }
503 : STRING activation rule_forall infixexp '=' srcloc exp
504 { RdrHsDecl (RuleD (HsRule $1 $2 $3 $4 $7 $6)) }
506 activation :: { Activation } -- Omitted means AlwaysActive
507 : {- empty -} { AlwaysActive }
508 | explicit_activation { $1 }
510 inverse_activation :: { Activation } -- Omitted means NeverActive
511 : {- empty -} { NeverActive }
512 | explicit_activation { $1 }
514 explicit_activation :: { Activation } -- In brackets
515 : '[' INTEGER ']' { ActiveAfter (fromInteger $2) }
516 | '[' '~' INTEGER ']' { ActiveBefore (fromInteger $3) }
518 rule_forall :: { [RdrNameRuleBndr] }
519 : 'forall' rule_var_list '.' { $2 }
522 rule_var_list :: { [RdrNameRuleBndr] }
524 | rule_var rule_var_list { $1 : $2 }
526 rule_var :: { RdrNameRuleBndr }
527 : varid { RuleBndr $1 }
528 | '(' varid '::' ctype ')' { RuleBndrSig $2 $4 }
530 -----------------------------------------------------------------------------
531 -- Deprecations (c.f. rules)
533 deprecations :: { [RdrBinding] } -- Reversed
534 : deprecations ';' deprecation { $3 : $1 }
535 | deprecations ';' { $1 }
536 | deprecation { [$1] }
539 -- SUP: TEMPORARY HACK, not checking for `module Foo'
540 deprecation :: { RdrBinding }
541 : srcloc depreclist STRING
543 [ RdrHsDecl (DeprecD (Deprecation n $3 $1)) | n <- $2 ] }
546 -----------------------------------------------------------------------------
547 -- Foreign import and export declarations
549 -- for the time being, the following accepts foreign declarations conforming
550 -- to the FFI Addendum, Version 1.0 as well as pre-standard declarations
552 -- * a flag indicates whether pre-standard declarations have been used and
553 -- triggers a deprecation warning further down the road
555 -- NB: The first two rules could be combined into one by replacing `safety1'
556 -- with `safety'. However, the combined rule conflicts with the
559 fdecl :: { RdrNameHsDecl }
560 fdecl : srcloc 'import' callconv safety1 fspec {% mkImport $3 $4 $5 $1 }
561 | srcloc 'import' callconv fspec {% mkImport $3 (PlaySafe False) $4 $1 }
562 | srcloc 'export' callconv fspec {% mkExport $3 $4 $1 }
563 -- the following syntax is DEPRECATED
564 | srcloc fdecl1DEPRECATED { ForD ($2 True $1) }
565 | srcloc fdecl2DEPRECATED { $2 $1 }
567 fdecl1DEPRECATED :: { Bool -> SrcLoc -> ForeignDecl RdrName }
569 ----------- DEPRECATED label decls ------------
570 : 'label' ext_name varid '::' sigtype
571 { ForeignImport $3 $5 (CImport defaultCCallConv (PlaySafe False) nilFS nilFS
572 (CLabel ($2 `orElse` mkExtName $3))) }
574 ----------- DEPRECATED ccall/stdcall decls ------------
576 -- NB: This business with the case expression below may seem overly
577 -- complicated, but it is necessary to avoid some conflicts.
579 -- DEPRECATED variant #1: lack of a calling convention specification
581 | 'import' {-no callconv-} ext_name safety varid_no_unsafe '::' sigtype
583 target = StaticTarget ($2 `orElse` mkExtName $4)
585 ForeignImport $4 $6 (CImport defaultCCallConv $3 nilFS nilFS
586 (CFunction target)) }
588 -- DEPRECATED variant #2: external name consists of two separate strings
589 -- (module name and function name) (import)
590 | 'import' callconv STRING STRING safety varid_no_unsafe '::' sigtype
592 DNCall -> parseError "Illegal format of .NET foreign import"
593 CCall cconv -> returnP $
595 imp = CFunction (StaticTarget $4)
597 ForeignImport $6 $8 (CImport cconv $5 nilFS nilFS imp) }
599 -- DEPRECATED variant #3: `unsafe' after entity
600 | 'import' callconv STRING 'unsafe' varid_no_unsafe '::' sigtype
602 DNCall -> parseError "Illegal format of .NET foreign import"
603 CCall cconv -> returnP $
605 imp = CFunction (StaticTarget $3)
607 ForeignImport $5 $7 (CImport cconv PlayRisky nilFS nilFS imp) }
609 -- DEPRECATED variant #4: use of the special identifier `dynamic' without
610 -- an explicit calling convention (import)
611 | 'import' {-no callconv-} 'dynamic' safety varid_no_unsafe '::' sigtype
612 { ForeignImport $4 $6 (CImport defaultCCallConv $3 nilFS nilFS
613 (CFunction DynamicTarget)) }
615 -- DEPRECATED variant #5: use of the special identifier `dynamic' (import)
616 | 'import' callconv 'dynamic' safety varid_no_unsafe '::' sigtype
618 DNCall -> parseError "Illegal format of .NET foreign import"
619 CCall cconv -> returnP $
620 ForeignImport $5 $7 (CImport cconv $4 nilFS nilFS
621 (CFunction DynamicTarget)) }
623 -- DEPRECATED variant #6: lack of a calling convention specification
625 | 'export' {-no callconv-} ext_name varid '::' sigtype
626 { ForeignExport $3 $5 (CExport (CExportStatic ($2 `orElse` mkExtName $3)
629 -- DEPRECATED variant #7: external name consists of two separate strings
630 -- (module name and function name) (export)
631 | 'export' callconv STRING STRING varid '::' sigtype
633 DNCall -> parseError "Illegal format of .NET foreign import"
634 CCall cconv -> returnP $
636 (CExport (CExportStatic $4 cconv)) }
638 -- DEPRECATED variant #8: use of the special identifier `dynamic' without
639 -- an explicit calling convention (export)
640 | 'export' {-no callconv-} 'dynamic' varid '::' sigtype
641 { ForeignImport $3 $5 (CImport defaultCCallConv (PlaySafe False) nilFS nilFS
644 -- DEPRECATED variant #9: use of the special identifier `dynamic' (export)
645 | 'export' callconv 'dynamic' varid '::' sigtype
647 DNCall -> parseError "Illegal format of .NET foreign import"
648 CCall cconv -> returnP $
649 ForeignImport $4 $6 (CImport cconv (PlaySafe False) nilFS nilFS CWrapper) }
651 ----------- DEPRECATED .NET decls ------------
652 -- NB: removed the .NET call declaration, as it is entirely subsumed
653 -- by the new standard FFI declarations
655 fdecl2DEPRECATED :: { SrcLoc -> RdrNameHsDecl }
657 : 'import' 'dotnet' 'type' ext_name tycon
658 { \loc -> TyClD (ForeignType $5 $4 DNType loc) }
659 -- left this one unchanged for the moment as type imports are not
660 -- covered currently by the FFI standard -=chak
663 callconv :: { CallConv }
664 : 'stdcall' { CCall StdCallConv }
665 | 'ccall' { CCall CCallConv }
666 | 'dotnet' { DNCall }
669 : 'unsafe' { PlayRisky }
670 | 'safe' { PlaySafe False }
671 | 'threadsafe' { PlaySafe True }
672 | {- empty -} { PlaySafe False }
674 safety1 :: { Safety }
675 : 'unsafe' { PlayRisky }
676 | 'safe' { PlaySafe False }
677 | 'threadsafe' { PlaySafe True }
678 -- only needed to avoid conflicts with the DEPRECATED rules
680 fspec :: { (FastString, RdrName, RdrNameHsType) }
681 : STRING var '::' sigtype { ($1 , $2, $4) }
682 | var '::' sigtype { (nilFS, $1, $3) }
683 -- if the entity string is missing, it defaults to the empty string;
684 -- the meaning of an empty entity string depends on the calling
688 ext_name :: { Maybe CLabelString }
690 | STRING STRING { Just $2 } -- Ignore "module name" for now
691 | {- empty -} { Nothing }
694 -----------------------------------------------------------------------------
697 opt_sig :: { Maybe RdrNameHsType }
698 : {- empty -} { Nothing }
699 | '::' sigtype { Just $2 }
701 opt_asig :: { Maybe RdrNameHsType }
702 : {- empty -} { Nothing }
703 | '::' atype { Just $2 }
705 sigtypes :: { [RdrNameHsType] }
707 | sigtypes ',' sigtype { $3 : $1 }
709 sigtype :: { RdrNameHsType }
710 : ctype { mkHsForAllTy Nothing [] $1 }
712 sig_vars :: { [RdrName] }
713 : sig_vars ',' var { $3 : $1 }
716 -----------------------------------------------------------------------------
719 -- A ctype is a for-all type
720 ctype :: { RdrNameHsType }
721 : 'forall' tv_bndrs '.' ctype { mkHsForAllTy (Just $2) [] $4 }
722 | context '=>' type { mkHsForAllTy Nothing $1 $3 }
723 -- A type of form (context => type) is an *implicit* HsForAllTy
726 -- We parse a context as a btype so that we don't get reduce/reduce
727 -- errors in ctype. The basic problem is that
729 -- looks so much like a tuple type. We can't tell until we find the =>
730 context :: { RdrNameContext }
731 : btype {% checkContext $1 }
733 type :: { RdrNameHsType }
734 : ipvar '::' gentype { mkHsIParamTy $1 $3 }
737 gentype :: { RdrNameHsType }
739 | btype qtyconop gentype { HsOpTy $1 (HsTyOp $2) $3 }
740 | btype '`' tyvar '`' gentype { HsOpTy $1 (HsTyOp $3) $5 }
741 | btype '->' gentype { HsOpTy $1 HsArrow $3 }
743 btype :: { RdrNameHsType }
744 : btype atype { HsAppTy $1 $2 }
747 atype :: { RdrNameHsType }
748 : gtycon { HsTyVar $1 }
749 | tyvar { HsTyVar $1 }
750 | '(' type ',' comma_types1 ')' { HsTupleTy (mkHsTupCon tcName Boxed ($2:$4)) ($2:$4) }
751 | '(#' comma_types1 '#)' { HsTupleTy (mkHsTupCon tcName Unboxed $2) $2 }
752 | '[' type ']' { HsListTy $2 }
753 | '[:' type ':]' { HsPArrTy $2 }
754 | '(' ctype ')' { HsParTy $2 }
755 | '(' ctype '::' kind ')' { HsKindSig $2 $4 }
757 | INTEGER { HsNumTy $1 }
759 -- An inst_type is what occurs in the head of an instance decl
760 -- e.g. (Foo a, Gaz b) => Wibble a b
761 -- It's kept as a single type, with a MonoDictTy at the right
762 -- hand corner, for convenience.
763 inst_type :: { RdrNameHsType }
764 : ctype {% checkInstType $1 }
766 comma_types0 :: { [RdrNameHsType] }
767 : comma_types1 { $1 }
770 comma_types1 :: { [RdrNameHsType] }
772 | type ',' comma_types1 { $1 : $3 }
774 tv_bndrs :: { [RdrNameHsTyVar] }
775 : tv_bndr tv_bndrs { $1 : $2 }
778 tv_bndr :: { RdrNameHsTyVar }
779 : tyvar { UserTyVar $1 }
780 | '(' tyvar '::' kind ')' { IfaceTyVar $2 $4 }
782 fds :: { [([RdrName], [RdrName])] }
784 | '|' fds1 { reverse $2 }
786 fds1 :: { [([RdrName], [RdrName])] }
787 : fds1 ',' fd { $3 : $1 }
790 fd :: { ([RdrName], [RdrName]) }
791 : varids0 '->' varids0 { (reverse $1, reverse $3) }
793 varids0 :: { [RdrName] }
795 | varids0 tyvar { $2 : $1 }
797 -----------------------------------------------------------------------------
802 | akind '->' kind { mkArrowKind $1 $3 }
805 : '*' { liftedTypeKind }
806 | '(' kind ')' { $2 }
809 -----------------------------------------------------------------------------
810 -- Datatype declarations
812 newconstr :: { RdrNameConDecl }
813 : srcloc conid atype { ConDecl $2 [] [] (PrefixCon [unbangedType $3]) $1 }
814 | srcloc conid '{' var '::' ctype '}'
815 { ConDecl $2 [] [] (RecCon [($4, unbangedType $6)]) $1 }
817 constrs :: { [RdrNameConDecl] }
818 : {- empty; a GHC extension -} { [] }
819 | '=' constrs1 { $2 }
821 constrs1 :: { [RdrNameConDecl] }
822 : constrs1 '|' constr { $3 : $1 }
825 constr :: { RdrNameConDecl }
826 : srcloc forall context '=>' constr_stuff
827 { ConDecl (fst $5) $2 $3 (snd $5) $1 }
828 | srcloc forall constr_stuff
829 { ConDecl (fst $3) $2 [] (snd $3) $1 }
831 forall :: { [RdrNameHsTyVar] }
832 : 'forall' tv_bndrs '.' { $2 }
835 constr_stuff :: { (RdrName, RdrNameConDetails) }
836 : btype {% mkPrefixCon $1 [] }
837 | btype '!' atype satypes {% mkPrefixCon $1 (BangType MarkedUserStrict $3 : $4) }
838 | oqtycon '{' '}' {% mkRecCon $1 [] }
839 | oqtycon '{' fielddecls '}' {% mkRecCon $1 $3 }
840 | sbtype conop sbtype { ($2, InfixCon $1 $3) }
842 satypes :: { [RdrNameBangType] }
843 : atype satypes { unbangedType $1 : $2 }
844 | '!' atype satypes { BangType MarkedUserStrict $2 : $3 }
847 sbtype :: { RdrNameBangType }
848 : btype { unbangedType $1 }
849 | '!' atype { BangType MarkedUserStrict $2 }
851 fielddecls :: { [([RdrName],RdrNameBangType)] }
852 : fielddecl ',' fielddecls { $1 : $3 }
855 fielddecl :: { ([RdrName],RdrNameBangType) }
856 : sig_vars '::' stype { (reverse $1, $3) }
858 stype :: { RdrNameBangType }
859 : ctype { unbangedType $1 }
860 | '!' atype { BangType MarkedUserStrict $2 }
862 deriving :: { Maybe RdrNameContext }
863 : {- empty -} { Nothing }
864 | 'deriving' context { Just $2 }
865 -- Glasgow extension: allow partial
866 -- applications in derivings
868 -----------------------------------------------------------------------------
871 {- There's an awkward overlap with a type signature. Consider
872 f :: Int -> Int = ...rhs...
873 Then we can't tell whether it's a type signature or a value
874 definition with a result signature until we see the '='.
875 So we have to inline enough to postpone reductions until we know.
879 ATTENTION: Dirty Hackery Ahead! If the second alternative of vars is var
880 instead of qvar, we get another shift/reduce-conflict. Consider the
883 { (^^) :: Int->Int ; } Type signature; only var allowed
885 { (^^) :: Int->Int = ... ; } Value defn with result signature;
886 qvar allowed (because of instance decls)
888 We can't tell whether to reduce var to qvar until after we've read the signatures.
891 decl :: { RdrBinding }
893 | infixexp srcloc opt_sig rhs {% checkValDef $1 $3 $4 $2 }
895 rhs :: { RdrNameGRHSs }
896 : '=' srcloc exp wherebinds { GRHSs (unguardedRHS $3 $2) $4 placeHolderType }
897 | gdrhs wherebinds { GRHSs (reverse $1) $2 placeHolderType }
899 gdrhs :: { [RdrNameGRHS] }
900 : gdrhs gdrh { $2 : $1 }
903 gdrh :: { RdrNameGRHS }
904 : '|' srcloc quals '=' exp { GRHS (reverse (ResultStmt $5 $2 : $3)) $2 }
906 sigdecl :: { RdrBinding }
907 : infixexp srcloc '::' sigtype
908 {% checkValSig $1 $4 $2 }
909 -- See the above notes for why we need infixexp here
910 | var ',' sig_vars srcloc '::' sigtype
911 { mkSigDecls [ Sig n $6 $4 | n <- $1:$3 ] }
912 | srcloc infix prec ops { mkSigDecls [ FixSig (FixitySig n (Fixity $3 $2) $1)
914 | '{-# INLINE' srcloc activation qvar '#-}'
915 { RdrHsDecl (SigD (InlineSig True $4 $3 $2)) }
916 | '{-# NOINLINE' srcloc inverse_activation qvar '#-}'
917 { RdrHsDecl (SigD (InlineSig False $4 $3 $2)) }
918 | '{-# SPECIALISE' srcloc qvar '::' sigtypes '#-}'
919 { mkSigDecls [ SpecSig $3 t $2 | t <- $5] }
920 | '{-# SPECIALISE' srcloc 'instance' inst_type '#-}'
921 { RdrHsDecl (SigD (SpecInstSig $4 $2)) }
923 -----------------------------------------------------------------------------
926 exp :: { RdrNameHsExpr }
927 : infixexp '::' sigtype { ExprWithTySig $1 $3 }
928 | infixexp 'with' dbinding { HsLet (IPBinds $3 True{-not a let-}) $1 }
931 infixexp :: { RdrNameHsExpr }
933 | infixexp qop exp10 { (OpApp $1 (HsVar $2)
934 (panic "fixity") $3 )}
936 exp10 :: { RdrNameHsExpr }
937 : '\\' srcloc aexp aexps opt_asig '->' srcloc exp
938 {% checkPatterns $2 ($3 : reverse $4) `thenP` \ ps ->
939 returnP (HsLam (Match ps $5
940 (GRHSs (unguardedRHS $8 $7)
941 EmptyBinds placeHolderType))) }
942 | 'let' binds 'in' exp { HsLet $2 $4 }
943 | 'if' srcloc exp 'then' exp 'else' exp { HsIf $3 $5 $7 $2 }
944 | 'case' srcloc exp 'of' altslist { HsCase $3 $5 $2 }
945 | '-' fexp { mkHsNegApp $2 }
946 | srcloc 'do' stmtlist {% checkDo $3 `thenP` \ stmts ->
947 returnP (mkHsDo DoExpr stmts $1) }
948 | srcloc 'mdo' stmtlist {% checkMDo $3 `thenP` \ stmts ->
949 returnP (mkHsDo MDoExpr stmts $1) }
951 | '_ccall_' ccallid aexps0 { HsCCall $2 $3 PlayRisky False placeHolderType }
952 | '_ccall_GC_' ccallid aexps0 { HsCCall $2 $3 (PlaySafe False) False placeHolderType }
953 | '_casm_' CLITLIT aexps0 { HsCCall $2 $3 PlayRisky True placeHolderType }
954 | '_casm_GC_' CLITLIT aexps0 { HsCCall $2 $3 (PlaySafe False) True placeHolderType }
956 | scc_annot exp { if opt_SccProfilingOn
960 | reifyexp { HsReify $1 }
963 scc_annot :: { FastString }
964 : '_scc_' STRING { $2 }
965 | '{-# SCC' STRING '#-}' { $2 }
967 ccallid :: { FastString }
971 fexp :: { RdrNameHsExpr }
972 : fexp aexp { (HsApp $1 $2) }
975 reifyexp :: { HsReify RdrName }
976 : REIFY_DECL gtycon { Reify ReifyDecl $2 }
977 | REIFY_DECL qvar { Reify ReifyDecl $2 }
978 | REIFY_TYPE qcname { Reify ReifyType $2 }
979 | REIFY_FIXITY qcname { Reify ReifyFixity $2 }
981 aexps0 :: { [RdrNameHsExpr] }
982 : aexps { reverse $1 }
984 aexps :: { [RdrNameHsExpr] }
985 : aexps aexp { $2 : $1 }
988 aexp :: { RdrNameHsExpr }
989 : qvar '@' aexp { EAsPat $1 $3 }
990 | '~' aexp { ELazyPat $2 }
993 aexp1 :: { RdrNameHsExpr }
994 : aexp1 '{' fbinds '}' {% (mkRecConstrOrUpdate $1 (reverse $3)) }
997 -- Here was the syntax for type applications that I was planning
998 -- but there are difficulties (e.g. what order for type args)
999 -- so it's not enabled yet.
1000 | qcname '{|' gentype '|}' { (HsApp (HsVar $1) (HsType $3)) }
1002 aexp2 :: { RdrNameHsExpr }
1003 : ipvar { HsIPVar $1 }
1004 | qcname { HsVar $1 }
1005 | literal { HsLit $1 }
1006 | INTEGER { HsOverLit (mkHsIntegral $1) }
1007 | RATIONAL { HsOverLit (mkHsFractional $1) }
1008 | '(' exp ')' { HsPar $2 }
1009 | '(' exp ',' texps ')' { ExplicitTuple ($2 : reverse $4) Boxed}
1010 | '(#' texps '#)' { ExplicitTuple (reverse $2) Unboxed }
1011 | '[' list ']' { $2 }
1012 | '[:' parr ':]' { $2 }
1013 | '(' infixexp qop ')' { (SectionL $2 (HsVar $3)) }
1014 | '(' qopm infixexp ')' { (SectionR $2 $3) }
1017 -- MetaHaskell Extension
1018 | srcloc ID_SPLICE { mkHsSplice (HsVar (mkUnqual varName $2)) $1 } -- $x
1019 | srcloc '$(' exp ')' { mkHsSplice $3 $1 } -- $( exp )
1020 | srcloc '[|' exp '|]' { HsBracket (ExpBr $3) $1 }
1021 | srcloc '[t|' ctype '|]' { HsBracket (TypBr $3) $1 }
1022 | srcloc '[p|' infixexp '|]' {% checkPattern $1 $3 `thenP` \p ->
1023 returnP (HsBracket (PatBr p) $1) }
1024 | srcloc '[d|' cvtopdecls '|]' { HsBracket (DecBr (mkGroup $3)) $1 }
1027 texps :: { [RdrNameHsExpr] }
1028 : texps ',' exp { $3 : $1 }
1032 -----------------------------------------------------------------------------
1035 -- The rules below are little bit contorted to keep lexps left-recursive while
1036 -- avoiding another shift/reduce-conflict.
1038 list :: { RdrNameHsExpr }
1039 : exp { ExplicitList placeHolderType [$1] }
1040 | lexps { ExplicitList placeHolderType (reverse $1) }
1041 | exp '..' { ArithSeqIn (From $1) }
1042 | exp ',' exp '..' { ArithSeqIn (FromThen $1 $3) }
1043 | exp '..' exp { ArithSeqIn (FromTo $1 $3) }
1044 | exp ',' exp '..' exp { ArithSeqIn (FromThenTo $1 $3 $5) }
1045 | exp srcloc pquals {% let { body [qs] = qs;
1046 body qss = [ParStmt (map reverse qss)] }
1048 returnP ( mkHsDo ListComp
1049 (reverse (ResultStmt $1 $2 : body $3))
1054 lexps :: { [RdrNameHsExpr] }
1055 : lexps ',' exp { $3 : $1 }
1056 | exp ',' exp { [$3,$1] }
1058 -----------------------------------------------------------------------------
1059 -- List Comprehensions
1061 pquals :: { [[RdrNameStmt]] }
1062 : pquals '|' quals { $3 : $1 }
1063 | '|' quals { [$2] }
1065 quals :: { [RdrNameStmt] }
1066 : quals ',' stmt { $3 : $1 }
1069 -----------------------------------------------------------------------------
1070 -- Parallel array expressions
1072 -- The rules below are little bit contorted; see the list case for details.
1073 -- Note that, in contrast to lists, we only have finite arithmetic sequences.
1074 -- Moreover, we allow explicit arrays with no element (represented by the nil
1075 -- constructor in the list case).
1077 parr :: { RdrNameHsExpr }
1078 : { ExplicitPArr placeHolderType [] }
1079 | exp { ExplicitPArr placeHolderType [$1] }
1080 | lexps { ExplicitPArr placeHolderType
1082 | exp '..' exp { PArrSeqIn (FromTo $1 $3) }
1083 | exp ',' exp '..' exp { PArrSeqIn (FromThenTo $1 $3 $5) }
1084 | exp srcloc pquals {% let {
1091 (reverse (ResultStmt $1 $2
1096 -- We are reusing `lexps' and `pquals' from the list case.
1098 -----------------------------------------------------------------------------
1099 -- Case alternatives
1101 altslist :: { [RdrNameMatch] }
1102 : '{' alts '}' { reverse $2 }
1103 | layout_on alts close { reverse $2 }
1105 alts :: { [RdrNameMatch] }
1109 alts1 :: { [RdrNameMatch] }
1110 : alts1 ';' alt { $3 : $1 }
1114 alt :: { RdrNameMatch }
1115 : srcloc infixexp opt_sig ralt wherebinds
1116 {% (checkPattern $1 $2 `thenP` \p ->
1117 returnP (Match [p] $3
1118 (GRHSs $4 $5 placeHolderType)) )}
1120 ralt :: { [RdrNameGRHS] }
1121 : '->' srcloc exp { [GRHS [ResultStmt $3 $2] $2] }
1122 | gdpats { reverse $1 }
1124 gdpats :: { [RdrNameGRHS] }
1125 : gdpats gdpat { $2 : $1 }
1128 gdpat :: { RdrNameGRHS }
1129 : srcloc '|' quals '->' exp { GRHS (reverse (ResultStmt $5 $1:$3)) $1}
1131 -----------------------------------------------------------------------------
1132 -- Statement sequences
1134 stmtlist :: { [RdrNameStmt] }
1135 : '{' stmts '}' { $2 }
1136 | layout_on_for_do stmts close { $2 }
1138 -- do { ;; s ; s ; ; s ;; }
1139 -- The last Stmt should be a ResultStmt, but that's hard to enforce
1140 -- here, because we need too much lookahead if we see do { e ; }
1141 -- So we use ExprStmts throughout, and switch the last one over
1142 -- in ParseUtils.checkDo instead
1143 stmts :: { [RdrNameStmt] }
1144 : stmt stmts_help { $1 : $2 }
1146 | {- empty -} { [] }
1148 stmts_help :: { [RdrNameStmt] }
1150 | {- empty -} { [] }
1152 -- For typing stmts at the GHCi prompt, where
1153 -- the input may consist of just comments.
1154 maybe_stmt :: { Maybe RdrNameStmt }
1156 | {- nothing -} { Nothing }
1158 stmt :: { RdrNameStmt }
1159 : srcloc infixexp '<-' exp {% checkPattern $1 $2 `thenP` \p ->
1160 returnP (BindStmt p $4 $1) }
1161 | srcloc exp { ExprStmt $2 placeHolderType $1 }
1162 | srcloc 'let' binds { LetStmt $3 }
1164 -----------------------------------------------------------------------------
1165 -- Record Field Update/Construction
1167 fbinds :: { RdrNameHsRecordBinds }
1168 : fbinds ',' fbind { $3 : $1 }
1171 | {- empty -} { [] }
1173 fbind :: { (RdrName, RdrNameHsExpr) }
1174 : qvar '=' exp { ($1,$3) }
1176 -----------------------------------------------------------------------------
1177 -- Implicit Parameter Bindings
1179 dbinding :: { [(IPName RdrName, RdrNameHsExpr)] }
1180 : '{' dbinds '}' { $2 }
1181 | layout_on dbinds close { $2 }
1183 dbinds :: { [(IPName RdrName, RdrNameHsExpr)] }
1184 : dbinds ';' dbind { $3 : $1 }
1187 -- | {- empty -} { [] }
1189 dbind :: { (IPName RdrName, RdrNameHsExpr) }
1190 dbind : ipvar '=' exp { ($1, $3) }
1192 -----------------------------------------------------------------------------
1193 -- Variables, Constructors and Operators.
1195 identifier :: { RdrName }
1200 depreclist :: { [RdrName] }
1201 depreclist : deprec_var { [$1] }
1202 | deprec_var ',' depreclist { $1 : $3 }
1204 deprec_var :: { RdrName }
1205 deprec_var : var { $1 }
1208 gcon :: { RdrName } -- Data constructor namespace
1211 -- the case of '[:' ':]' is part of the production `parr'
1213 sysdcon :: { RdrName } -- Data constructor namespace
1214 : '(' ')' { getRdrName unitDataCon }
1215 | '(' commas ')' { getRdrName (tupleCon Boxed $2) }
1216 | '[' ']' { nameRdrName nilDataConName }
1220 | '(' varsym ')' { $2 }
1224 | '(' varsym ')' { $2 }
1225 | '(' qvarsym1 ')' { $2 }
1226 -- We've inlined qvarsym here so that the decision about
1227 -- whether it's a qvar or a var can be postponed until
1228 -- *after* we see the close paren.
1230 ipvar :: { IPName RdrName }
1231 : IPDUPVARID { Dupable (mkUnqual varName $1) }
1232 | IPSPLITVARID { Linear (mkUnqual varName $1) }
1236 | '(' qconsym ')' { $2 }
1238 varop :: { RdrName }
1240 | '`' varid '`' { $2 }
1242 qvarop :: { RdrName }
1244 | '`' qvarid '`' { $2 }
1246 qvaropm :: { RdrName }
1247 : qvarsym_no_minus { $1 }
1248 | '`' qvarid '`' { $2 }
1250 conop :: { RdrName }
1252 | '`' conid '`' { $2 }
1254 qconop :: { RdrName }
1256 | '`' qconid '`' { $2 }
1258 -----------------------------------------------------------------------------
1259 -- Type constructors
1261 gtycon :: { RdrName } -- A "general" qualified tycon
1263 | '(' ')' { getRdrName unitTyCon }
1264 | '(' commas ')' { getRdrName (tupleTyCon Boxed $2) }
1265 | '(' '->' ')' { nameRdrName funTyConName }
1266 | '[' ']' { nameRdrName listTyConName }
1267 | '[:' ':]' { nameRdrName parrTyConName }
1269 oqtycon :: { RdrName } -- An "ordinary" qualified tycon
1271 | '(' qtyconsym ')' { $2 }
1273 qtyconop :: { RdrName } -- Qualified or unqualified
1275 | '`' qtycon '`' { $2 }
1277 tyconop :: { RdrName } -- Unqualified
1279 | '`' tycon '`' { $2 }
1281 qtycon :: { RdrName } -- Qualified or unqualified
1282 : QCONID { mkQual tcClsName $1 }
1285 tycon :: { RdrName } -- Unqualified
1286 : CONID { mkUnqual tcClsName $1 }
1288 qtyconsym :: { RdrName }
1289 : QCONSYM { mkQual tcClsName $1 }
1292 tyconsym :: { RdrName }
1293 : CONSYM { mkUnqual tcClsName $1 }
1295 -----------------------------------------------------------------------------
1298 op :: { RdrName } -- used in infix decls
1302 qop :: { RdrName {-HsExpr-} } -- used in sections
1306 qopm :: { RdrNameHsExpr } -- used in sections
1307 : qvaropm { HsVar $1 }
1308 | qconop { HsVar $1 }
1310 -----------------------------------------------------------------------------
1313 qvarid :: { RdrName }
1315 | QVARID { mkQual varName $1 }
1317 varid :: { RdrName }
1318 : varid_no_unsafe { $1 }
1319 | 'unsafe' { mkUnqual varName FSLIT("unsafe") }
1320 | 'safe' { mkUnqual varName FSLIT("safe") }
1321 | 'threadsafe' { mkUnqual varName FSLIT("threadsafe") }
1323 varid_no_unsafe :: { RdrName }
1324 : VARID { mkUnqual varName $1 }
1325 | special_id { mkUnqual varName $1 }
1326 | 'forall' { mkUnqual varName FSLIT("forall") }
1328 tyvar :: { RdrName }
1329 : VARID { mkUnqual tvName $1 }
1330 | special_id { mkUnqual tvName $1 }
1331 | 'unsafe' { mkUnqual tvName FSLIT("unsafe") }
1332 | 'safe' { mkUnqual tvName FSLIT("safe") }
1333 | 'threadsafe' { mkUnqual tvName FSLIT("threadsafe") }
1335 -- These special_ids are treated as keywords in various places,
1336 -- but as ordinary ids elsewhere. 'special_id' collects all these
1337 -- except 'unsafe' and 'forall' whose treatment differs depending on context
1338 special_id :: { UserFS }
1340 : 'as' { FSLIT("as") }
1341 | 'qualified' { FSLIT("qualified") }
1342 | 'hiding' { FSLIT("hiding") }
1343 | 'export' { FSLIT("export") }
1344 | 'label' { FSLIT("label") }
1345 | 'dynamic' { FSLIT("dynamic") }
1346 | 'stdcall' { FSLIT("stdcall") }
1347 | 'ccall' { FSLIT("ccall") }
1349 -----------------------------------------------------------------------------
1352 qvarsym :: { RdrName }
1356 qvarsym_no_minus :: { RdrName }
1357 : varsym_no_minus { $1 }
1360 qvarsym1 :: { RdrName }
1361 qvarsym1 : QVARSYM { mkQual varName $1 }
1363 varsym :: { RdrName }
1364 : varsym_no_minus { $1 }
1365 | '-' { mkUnqual varName FSLIT("-") }
1367 varsym_no_minus :: { RdrName } -- varsym not including '-'
1368 : VARSYM { mkUnqual varName $1 }
1369 | special_sym { mkUnqual varName $1 }
1372 -- See comments with special_id
1373 special_sym :: { UserFS }
1374 special_sym : '!' { FSLIT("!") }
1375 | '.' { FSLIT(".") }
1376 | '*' { FSLIT("*") }
1378 -----------------------------------------------------------------------------
1379 -- Data constructors
1381 qconid :: { RdrName } -- Qualified or unqualifiedb
1383 | QCONID { mkQual dataName $1 }
1385 conid :: { RdrName }
1386 : CONID { mkUnqual dataName $1 }
1388 qconsym :: { RdrName } -- Qualified or unqualified
1390 | QCONSYM { mkQual dataName $1 }
1392 consym :: { RdrName }
1393 : CONSYM { mkUnqual dataName $1 }
1394 | ':' { nameRdrName consDataConName }
1395 -- ':' means only list cons
1398 -----------------------------------------------------------------------------
1401 literal :: { HsLit }
1402 : CHAR { HsChar $1 }
1403 | STRING { HsString $1 }
1404 | PRIMINTEGER { HsIntPrim $1 }
1405 | PRIMCHAR { HsCharPrim $1 }
1406 | PRIMSTRING { HsStringPrim $1 }
1407 | PRIMFLOAT { HsFloatPrim $1 }
1408 | PRIMDOUBLE { HsDoublePrim $1 }
1409 | CLITLIT { HsLitLit $1 placeHolderType }
1411 srcloc :: { SrcLoc } : {% getSrcLocP }
1413 -----------------------------------------------------------------------------
1417 : vccurly { () } -- context popped in lexer.
1418 | error {% popContext }
1420 layout_on :: { () } : {% layoutOn True{-strict-} }
1421 layout_on_for_do :: { () } : {% layoutOn False }
1423 -----------------------------------------------------------------------------
1424 -- Miscellaneous (mostly renamings)
1426 modid :: { ModuleName }
1427 : CONID { mkModuleNameFS $1 }
1428 | QCONID { mkModuleNameFS
1430 (unpackFS (fst $1) ++
1431 '.':unpackFS (snd $1)))
1435 : commas ',' { $1 + 1 }
1438 -----------------------------------------------------------------------------
1442 happyError buf PState{ loc = loc } = PFailed (srcParseErr buf loc)