Updates that takes a step: ElimModal instance, and a more easy to use lemma [wp_fupd_step].
...  ...  @@ 222,4 +222,11 @@ Proof. 
iNext. iMod "HM2". iMod "HP". iMod "HM1". done.  
Qed.  
Global Instance elim_modal_step_fupd E1 E2 E3 E4 P Q :  
ElimModal (={E1,E2}=>▷={E2,E3}=> P) P  
(={E1,E2}=>▷={E2,E4}=> Q) (={E3,E4}=> Q).  
Proof.  
iIntros "[A B]". iMod "A". iModIntro. iNext. iMod "A". by iApply "B".  
Qed.  


End step_fupd. 

Mentioned in issue #48 (closed)