let res =
match t with
| C.Meta (i,(s,C.Ctx l)) ->
- let l1 = U.sharing_map (aux (k-s)) l in
+ let l1 = HExtlib.sharing_map (aux (k-s)) l in
if l1 == l then t else C.Meta (i,(s,C.Ctx l1))
| C.Meta _ -> t
| C.Const (Ref.Ref (_,uri1,(Ref.Fix (no,_) | Ref.CoFix no)))