dataTypeOf _ = $dT
+ dataCast1 = gcast1 -- If T :: * -> *
+ dataCast2 = gcast2 -- if T :: * -> * -> *
+
+
\begin{code}
gen_Data_binds :: SrcSpan
-> TyCon
-> (LHsBinds RdrName, -- The method bindings
DerivAuxBinds) -- Auxiliary bindings
gen_Data_binds loc tycon
- = (listToBag [gfoldl_bind, gunfold_bind, toCon_bind, dataTypeOf_bind],
+ = (listToBag [gfoldl_bind, gunfold_bind, toCon_bind, dataTypeOf_bind]
+ `unionBags` gcast_binds,
-- Auxiliary definitions: the data type and constructors
MkTyCon tycon : map MkDataCon data_cons)
where
[nlWildPat]
(nlHsVar (mk_data_type_name tycon))
+ ------------ gcast1/2
+ tycon_kind = tyConKind tycon
+ gcast_binds | tycon_kind `eqKind` kind1 = mk_gcast dataCast1_RDR gcast1_RDR
+ | tycon_kind `eqKind` kind2 = mk_gcast dataCast2_RDR gcast2_RDR
+ | otherwise = emptyBag
+ mk_gcast dataCast_RDR gcast_RDR
+ = unitBag (mk_easy_FunBind loc dataCast_RDR [nlVarPat f_RDR]
+ (nlHsVar gcast_RDR `nlHsApp` nlHsVar f_RDR))
+
+
+kind1, kind2 :: Kind
+kind1 = liftedTypeKind `mkArrowKind` liftedTypeKind
+kind2 = liftedTypeKind `mkArrowKind` kind1
gfoldl_RDR, gunfold_RDR, toConstr_RDR, dataTypeOf_RDR, mkConstr_RDR,
- mkDataType_RDR, conIndex_RDR, prefix_RDR, infix_RDR :: RdrName
+ mkDataType_RDR, conIndex_RDR, prefix_RDR, infix_RDR,
+ dataCast1_RDR, dataCast2_RDR, gcast1_RDR, gcast2_RDR :: RdrName
gfoldl_RDR = varQual_RDR gENERICS (fsLit "gfoldl")
gunfold_RDR = varQual_RDR gENERICS (fsLit "gunfold")
toConstr_RDR = varQual_RDR gENERICS (fsLit "toConstr")
dataTypeOf_RDR = varQual_RDR gENERICS (fsLit "dataTypeOf")
+dataCast1_RDR = varQual_RDR gENERICS (fsLit "dataCast1")
+dataCast2_RDR = varQual_RDR gENERICS (fsLit "dataCast2")
+gcast1_RDR = varQual_RDR tYPEABLE (fsLit "gcast1")
+gcast2_RDR = varQual_RDR tYPEABLE (fsLit "gcast2")
mkConstr_RDR = varQual_RDR gENERICS (fsLit "mkConstr")
mkDataType_RDR = varQual_RDR gENERICS (fsLit "mkDataType")
conIndex_RDR = varQual_RDR gENERICS (fsLit "constrIndex")