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    • Abel Nieto's avatar
      Add mapsto_mapsto_ne helper lemma · f227f6fa
      Abel Nieto authored
      Here's one case this lemma might be useful. Suppose we want to
      programmatically generate namespaces for e.g. locks:
      
      ```
      Definition lockN (l : loc) := nroot .@ "lock" .@ l.
      ```
      
      Then to know that two such namespaces are disjoint, we need to know
      that the corresponding locations are distinct. For that we use
      the lemma here introduced.
      
      ```
      Lemma ne l1 l2 v1 v2 :
        l1 ↦ v1 -∗ l2 ↦ v2 -∗ ⌜l1 ≠ l2⌝.
      Proof. iApply mapsto_mapsto_ne. (* goal ¬ ✓ 2%Qp *) by intros []. Qed.
      ```
      f227f6fa