(** Recognition of move operations. *)

Definition is_move_operation
    (A: Type) (op: operation) (args: list A) : option A :=
  match op, args with
  | Omove, arg :: nil => Some arg
  | _, _ => None
  end.

Lemma is_move_operation_correct: forall (A: Type) (op: operation) (args: list A) (a: A), is_move_operation op args = Some a -> op = Omove /\ args = a :: nil.