Section MoveToSymbol_Sem.
Local Arguments skipn { A } !n !l.
Local Arguments plus : simpl never.
Local Arguments mult : simpl never.
Variable sig : finType.
(* Halt function *)
Variable stop : sig -> bool.
(* Rewrite function *)
Variable f : sig -> sig.
(* Termination times *)
(* The termination times of CopySymbols and MoveTosymbol only differ in the factors *)

Lemma MoveToSymbol_steps_local t r1 sym r2 :
tape_local t = r1 ++ sym :: r2 ->
stop sym = true ->
MoveToSymbol_steps stop f t <= 4 + 4 * length r1.