'unsafe' { L _ ITunsafe }
'mdo' { L _ ITmdo }
'iso' { L _ ITiso }
+ 'family' { L _ ITfamily }
'stdcall' { L _ ITstdcallconv }
'ccall' { L _ ITccallconv }
'dotnet' { L _ ITdotnet }
{% do { let { (binds, sigs, ats) =
cvBindsAndSigs (unLoc $4)
; (ctxt, tc, tvs, tparms) = unLoc $2}
- ; checkTyVars tparms False -- only type vars allowed
+ ; checkTyVars tparms -- only type vars allowed
; checkKindSigs ats
; return $ L (comb4 $1 $2 $3 $4)
(mkClassDecl (ctxt, tc, tvs)
-- Type declarations
--
ty_decl :: { LTyClDecl RdrName }
- -- type function signature and equations (w/ type synonyms as special
- -- case); we need to handle all this in one rule to avoid a large
- -- number of shift/reduce conflicts
- : 'type' opt_iso type kind_or_ctype
+ -- ordinary type synonyms
+ : 'type' type '=' ctype
+ -- Note ctype, not sigtype, on the right of '='
+ -- We allow an explicit for-all but we don't insert one
+ -- in type Foo a = (b,b)
+ -- Instead we just say b is out of scope
--
-- Note the use of type for the head; this allows
- -- infix type constructors to be declared and type
- -- patterns for type function equations
- --
- -- We have that `typats :: Maybe [LHsType name]' is `Nothing'
- -- (in the second case alternative) when all arguments are
- -- variables (and we thus have a vanilla type synonym
- -- declaration); otherwise, it contains all arguments as type
- -- patterns.
+ -- infix type constructors to be declared
+ {% do { (tc, tvs, _) <- checkSynHdr $2 False
+ ; return (L (comb2 $1 $4)
+ (TySynonym tc tvs Nothing $4))
+ } }
+
+ -- type family declarations
+ | 'type' 'family' opt_iso type '::' kind
+ -- Note the use of type for the head; this allows
+ -- infix type constructors to be declared
--
- {% case $4 of
- Left kind ->
- do { (tc, tvs, _) <- checkSynHdr $3 False
- ; return (L (comb3 $1 $3 kind)
- (TyFunction tc tvs $2 (unLoc kind)))
- }
- Right ty | not $2 ->
- do { (tc, tvs, typats) <- checkSynHdr $3 True
- ; return (L (comb2 $1 ty)
- (TySynonym tc tvs typats ty)) }
- Right ty | otherwise ->
- parseError (comb2 $1 ty)
- "iso tag is only allowed in kind signatures"
- }
-
- -- kind signature of indexed type
- | data_or_newtype tycl_hdr '::' kind
- {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2}
- ; checkTyVars tparms False -- no type pattern
- ; return $
- L (comb3 $1 $2 $4)
- (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing)
- (Just (unLoc $4)) [] Nothing) } }
+ {% do { (tc, tvs, _) <- checkSynHdr $4 False
+ ; return (L (comb3 $1 $4 $6)
+ (TyFunction tc tvs $3 (unLoc $6)))
+ } }
+
+ -- type instance declarations
+ | 'type' 'instance' type '=' ctype
+ -- Note the use of type for the head; this allows
+ -- infix type constructors and type patterns
+ --
+ {% do { (tc, tvs, typats) <- checkSynHdr $3 True
+ ; return (L (comb2 $1 $5)
+ (TySynonym tc tvs (Just typats) $5))
+ } }
- -- data type or newtype declaration
+ -- ordinary data type or newtype declaration
| data_or_newtype tycl_hdr constrs deriving
{% do { let {(ctxt, tc, tvs, tparms) = unLoc $2}
- ; tpats <- checkTyVars tparms True -- can have type pats
+ ; checkTyVars tparms -- no type pattern
; return $
L (comb4 $1 $2 $3 $4)
-- We need the location on tycl_hdr in case
-- constrs and deriving are both empty
- (mkTyData (unLoc $1) (ctxt, tc, tvs, tpats)
- Nothing (reverse (unLoc $3)) (unLoc $4)) } }
+ (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing)
+ Nothing (reverse (unLoc $3)) (unLoc $4)) } }
- -- GADT declaration
+ -- ordinary GADT declaration
| data_or_newtype tycl_hdr opt_kind_sig
'where' gadt_constrlist
deriving
{% do { let {(ctxt, tc, tvs, tparms) = unLoc $2}
- ; tpats <- checkTyVars tparms True -- can have type pats
+ ; checkTyVars tparms -- can have type pats
; return $
L (comb4 $1 $2 $4 $5)
- (mkTyData (unLoc $1) (ctxt, tc, tvs, tpats) $3
- (reverse (unLoc $5)) (unLoc $6)) } }
+ (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing) $3
+ (reverse (unLoc $5)) (unLoc $6)) } }
+
+ -- data/newtype family
+ | data_or_newtype 'family' tycl_hdr '::' kind
+ {% do { let {(ctxt, tc, tvs, tparms) = unLoc $3}
+ ; checkTyVars tparms -- no type pattern
+ ; return $
+ L (comb3 $1 $2 $5)
+ (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing)
+ (Just (unLoc $5)) [] Nothing) } }
+
+ -- data/newtype instance declaration
+ | data_or_newtype 'instance' tycl_hdr constrs deriving
+ {% do { let {(ctxt, tc, tvs, tparms) = unLoc $3}
+ -- can have type pats
+ ; return $
+ L (comb4 $1 $3 $4 $5)
+ -- We need the location on tycl_hdr in case
+ -- constrs and deriving are both empty
+ (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms)
+ Nothing (reverse (unLoc $4)) (unLoc $5)) } }
+
+ -- GADT instance declaration
+ | data_or_newtype 'instance' tycl_hdr opt_kind_sig
+ 'where' gadt_constrlist
+ deriving
+ {% do { let {(ctxt, tc, tvs, tparms) = unLoc $3}
+ -- can have type pats
+ ; return $
+ L (comb4 $1 $3 $6 $7)
+ (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms)
+ $4 (reverse (unLoc $6)) (unLoc $7)) } }
opt_iso :: { Bool }
: { False }
| 'iso' { True }
-kind_or_ctype :: { Either (Located Kind) (LHsType RdrName) }
- : '::' kind { Left (LL (unLoc $2)) }
- | '=' ctype { Right (LL (unLoc $2)) }
- -- Note ctype, not sigtype, on the right of '='
- -- We allow an explicit for-all but we don't insert one
- -- in type Foo a = (b,b)
- -- Instead we just say b is out of scope
-
data_or_newtype :: { Located NewOrData }
: 'data' { L1 DataType }
| 'newtype' { L1 NewType }
: VARID { L1 $! mkUnqual varName (getVARID $1) }
| special_id { L1 $! mkUnqual varName (unLoc $1) }
| 'forall' { L1 $! mkUnqual varName FSLIT("forall") }
+ | 'iso' { L1 $! mkUnqual varName FSLIT("iso") }
+ | 'family' { L1 $! mkUnqual varName FSLIT("family") }
qvarsym :: { Located RdrName }
: varsym { $1 }
-- These special_ids are treated as keywords in various places,
-- but as ordinary ids elsewhere. 'special_id' collects all these
--- except 'unsafe' and 'forall' whose treatment differs depending on context
+-- except 'unsafe', 'forall', 'family', and 'iso' whose treatment differs
+-- depending on context
special_id :: { Located FastString }
special_id
: 'as' { L1 FSLIT("as") }
| 'dynamic' { L1 FSLIT("dynamic") }
| 'stdcall' { L1 FSLIT("stdcall") }
| 'ccall' { L1 FSLIT("ccall") }
- | 'iso' { L1 FSLIT("iso") }
special_sym :: { Located FastString }
special_sym : '!' { L1 FSLIT("!") }
projects / ghc-hetmet.git / blobdiff