Section GhostRules.
Variables (W : world) (A B C : Type).
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(* Lemmas for instantiating ghost variables *)
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Variables (s : C -> spec A) (f : DTbin this W (logvar s)).

Lemma ret_rule W A i (v : A) (r : cont A) :
(forall m, network_rely W this i m -> r v m) ->
verify i (ret this W v) r.