+-- Associate type declarations
+--
+at_decl :: { LTyClDecl RdrName }
+ -- type family declarations
+ : 'type' opt_iso type '::' kind
+ -- Note the use of type for the head; this allows
+ -- infix type constructors to be declared
+ --
+ {% do { (tc, tvs, _) <- checkSynHdr $3 False
+ ; return (L (comb3 $1 $3 $5)
+ (TyFunction tc tvs $2 (unLoc $5)))
+ } }
+
+ -- type instance declarations
+ | 'type' opt_iso type '=' ctype
+ -- Note the use of type for the head; this allows
+ -- infix type constructors and type patterns
+ --
+ {% do { when $2 $
+ parseError (comb2 $1 $>) "Misplaced iso keyword"
+ ; (tc, tvs, typats) <- checkSynHdr $3 True
+ ; return (L (comb2 $1 $5)
+ (TySynonym tc tvs (Just typats) $5))
+ } }
+
+ -- data/newtype family
+ | data_or_newtype tycl_hdr '::' kind
+ {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2}
+ ; checkTyVars tparms -- no type pattern
+ ; return $
+ L (comb3 $1 $2 $4)
+ (mkTyData (unLoc $1) (ctxt, tc, tvs, Nothing)
+ (Just (unLoc $4)) [] Nothing) } }
+
+ -- data/newtype instance declaration
+ | data_or_newtype tycl_hdr constrs deriving
+ {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2}
+ -- can have type pats
+ ; 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, Just tparms)
+ Nothing (reverse (unLoc $3)) (unLoc $4)) } }
+
+ -- GADT instance declaration
+ | data_or_newtype tycl_hdr opt_kind_sig
+ 'where' gadt_constrlist
+ deriving
+ {% do { let {(ctxt, tc, tvs, tparms) = unLoc $2}
+ -- can have type pats
+ ; return $
+ L (comb4 $1 $2 $5 $6)
+ (mkTyData (unLoc $1) (ctxt, tc, tvs, Just tparms)
+ $3 (reverse (unLoc $5)) (unLoc $6)) } }
+