Fix.

theories/lifetime/model/boxes.v

@@ -235,7 +235,7 @@ Proof.
   iAssert (([∗ map] γ↦b ∈ f, ▷ Φ γ V) ∗
     [∗ map] γ↦b ∈ f, box_own_auth γ (◯ Excl' None) ∗  box_own_prop γ (Φ γ) ∗
       inv N (slice_inv γ (Φ γ)))%I with "[> Hf]" as "[HΦ ?]".
-  { rewrite -big_opM_opM -fupd_big_sepM. iApply (@big_sepM_impl with "[$Hf]").
+  { rewrite -big_sepM_sep -fupd_big_sepM. iApply (@big_sepM_impl with "[$Hf]").
     iAlways; iIntros (γ o ?) "(Hγ' & #HγΦ & #Hinv)".
     assert (Ho : from_option (⊑ V) False o) by eauto.
     destruct o as [V'|]=>//. rewrite -Ho.