let empty_lenv = ESort
-let push f lenv a b = f (EBind (lenv, a, b))
+let push_bind f lenv a b = f (EBind (lenv, a, b))
+let push_proj f lenv a e = f (EProj (lenv, a, e))
+
+let push2 err f lenv attr ?t = match lenv, t with
+ | EBind (e, a, Abst ws), Some t -> f (EBind (e, (attr :: a), Abst (t :: ws)))
+ | EBind (e, a, Abbr vs), Some t -> f (EBind (e, (attr :: a), Abbr (t :: vs)))
+ | EBind (e, a, Void n), None -> f (EBind (e, (attr :: a), Void (succ n)))
+ | _ -> err ()
+
+(* this id not tail recursive *)
let resolve_lref err f id lenv =
let rec aux f i k = function
| ESort -> err ()
| EProj _ -> assert false (* TODO *)
in
aux f 0 0 lenv
+
+let rec get_name err f i j = function
+ | ESort -> err i
+ | EBind (_, a, _) when i = 0 ->
+ let err () = err i in
+ Entity.get_name err f j a
+ | EBind (tl, _, _) ->
+ get_name err f (pred i) j tl
+ | EProj (tl, _, e) ->
+ let err i = get_name err f i j tl in
+ get_name err f i j e