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Commit 414b7b1e authored by Robbert Krebbers's avatar Robbert Krebbers
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Another form of associativity for `opM`.

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      theories/algebra/cmra.v
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      ......@@ -1333,6 +1333,9 @@ Section option.
      Lemma op_is_Some mx my : is_Some (mx ⋅ my) ↔ is_Some mx ∨ is_Some my.
      Proof. rewrite -!not_eq_None_Some op_None. destruct mx, my; naive_solver. Qed.
      Lemma cmra_opM_assoc' x my mz : x ⋅? my ⋅? mz ≡ x ⋅? (my ⋅ mz).
      Proof. destruct my, mz; by rewrite /= -?assoc. Qed.
      Global Instance Some_core_id (x : A) : CoreId x → CoreId (Some x).
      Proof. by constructor. Qed.
      Global Instance option_core_id (mx : option A) :
      ......
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