+
+let is_sober t =
+ let rec sober_term g = function
+ | C.Rel _
+ | C.Sort _
+ | C.Implicit _ -> g
+ | C.Const (_, xnss)
+ | C.Var (_, xnss)
+ | C.MutConstruct (_, _, _, xnss)
+ | C.MutInd (_, _, xnss) -> sober_xnss g xnss
+ | C.Meta (_, xss) -> sober_xss g xss
+ | C.LetIn (_, v, t)
+ | C.Lambda (_, v, t)
+ | C.Prod (_, v, t)
+ | C.Cast (t, v) -> sober_term (sober_term g t) v
+ | C.Appl []
+ | C.Appl [_] -> fun b -> false
+ | C.Appl ts -> sober_terms g ts
+ | C.MutCase (_, _, t, v, ts) ->
+ sober_terms (sober_term (sober_term g t) v) ts
+ | C.Fix (_, ifs) -> sober_ifs g ifs
+ | C.CoFix (_, cifs) -> sober_cifs g cifs
+ and sober_terms g = List.fold_left sober_term g
+ and sober_xnss g =
+ let map g (_, t) = sober_term g t in
+ List.fold_left map g
+ and sober_xss g =
+ let map g = function
+ | None -> g
+ | Some t -> sober_term g t
+ in
+ List.fold_left map g
+ and sober_ifs g =
+ let map g (_, _, t, v) = sober_term (sober_term g t) v in
+ List.fold_left map g
+ and sober_cifs g =
+ let map g (_, t, v) = sober_term (sober_term g t) v in
+ List.fold_left map g
+ in
+ sober_term (fun b -> b) t true