Make iLeft and iRight work with later.

base_logic/lib/boxes.v

@@ -276,7 +276,6 @@ Proof.
     eapply internal_eq_rewrite_contractive; [by apply _| |by eauto].
     iNext. iRewrite "Heq1". iRewrite "Heq2". by rewrite assoc.
 Qed.
-
 End box.
 
 Typeclasses Opaque slice box.

proofmode/class_instances.v

@@ -330,6 +330,9 @@ Proof. done. Qed.
 Global Instance from_or_bupd P Q1 Q2 :
   FromOr P Q1 Q2 → FromOr (|==> P) (|==> Q1) (|==> Q2).
 Proof. rewrite /FromOr=><-. apply or_elim; apply bupd_mono; auto with I. Qed.
+Global Instance from_or_later P Q1 Q2 :
+  FromOr P Q1 Q2 → FromOr (▷ P) (▷ Q1) (▷ Q2).
+Proof. rewrite /FromOr=><-. apply or_elim; apply later_mono; auto with I. Qed.
 
 (* IntoOr *)
 Global Instance into_or_or P Q : IntoOr (P ∨ Q) P Q.