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|
(********* INSTANTIATE ****************************************************)
(* existential_type gives the type of an existential *)
let existential_type env k =
let (sp,args) = destConst k in
let evd = Evd.map (evar_map env) sp in
instantiate_constr
(ids_of_sign evd.evar_hyps) evd.evar_concl.body (Array.to_list args)
(* existential_value gives the value of a defined existential *)
let existential_value env k =
let (sp,args) = destConst k in
if defined_const env k then
let evd = Evd.map (evar_map env) sp in
match evd.evar_body with
| EVAR_DEFINED c ->
instantiate_constr (ids_of_sign evd.evar_hyps) c (Array.to_list args)
| _ -> anomalylabstrm "termenv__existential_value"
[< 'sTR"The existential variable code just registered a" ;
'sPC ; 'sTR"grave internal error." >]
else
failwith "undefined existential"
(******* REDUCTION ********************************************************)
(************ REDUCTION.MLI **********************************************)
(*********** TYPEOPS *****************************************************)
(* Constants or existentials. *)
let type_of_constant_or_existential env c =
if is_existential c then
type_of_existential env c
else
type_of_constant env c
(******** TYPING **********************************************************)
| IsMeta n ->
let metaty =
try lookup_meta n env
with Not_found -> error "A variable remains non instanciated"
in
(match kind_of_term metaty with
| IsCast (typ,kind) ->
({ uj_val = cstr; uj_type = typ; uj_kind = kind }, cst0)
| _ ->
let (jty,cst) = execute mf env metaty in
let k = whd_betadeltaiotaeta env jty.uj_type in
({ uj_val = cstr; uj_type = metaty; uj_kind = k }, cst))
|
