(** The tactic [repeat T] never fails: if the tactic [T] doesn't apply to the original goal, then repeat still succeeds without changing the original goal (i.e., it repeats zero times). *)

(* Specifications: *)
Theorem In10' : In 10 [1;2;3;4;5;6;7;8;9;10].
Fixpoint optimize_0plus_b (b : bexp) : bexp
Module aevalR_first_try.