+ let last_n n l =
+ let rec aux =
+ function
+ [] -> assert false
+ | [_] as l -> l,1
+ | he::tl ->
+ let (res,len) as res' = aux tl in
+ if len < n then
+ he::res,len + 1
+ else
+ res'
+ in
+ match fst (aux l) with
+ [] -> assert false
+ | [t] -> t
+ | Ast.AttributedTerm (_,(Ast.Appl l))::tl ->
+ idref aid (Ast.Appl (l@tl))
+ | l -> idref aid (Ast.Appl l)
+ in
+ let deannot_he = Deannotate.deannotate_term he in
+ if CoercGraph.is_a_coercion deannot_he && !Acic2content.hide_coercions