Inductive ev_plus ge: state -> mem -> _ -> state -> mem -> Prop :=
  | ev_plus_left: forall s1 m1 ev1 s2 m2 ev2 s3 m3,
      ev_step (CLC_evsem ge) s1 m1 ev1 s2 m2 -> ev_star ge s2 m2 ev2 s3 m3 ->
      ev_plus ge s1 m1 (ev1 ++ ev2) s3 m3.Inductive ev_plus ge: state -> mem -> _ -> state -> mem -> Prop :=
  | ev_plus_left: forall s1 m1 ev1 s2 m2 ev2 s3 m3,
      ev_step (CLC_evsem ge) s1 m1 ev1 s2 m2 -> ev_star ge s2 m2 ev2 s3 m3 ->
      ev_plus ge s1 m1 (ev1 ++ ev2) s3 m3.

Lemma evexec_skips': forall ge f s k' s0 k0' ve te m mm, strip_skip' (CC.Kseq s k') = CC.Kseq s0 k0' -> exists mm', ev_star ge (CC.State f s k' ve te mm) m nil (CC.State f s0 k0' ve te mm') m.