(* Representing q as a unary postcondition, including the precondition *)
Definition binarify {A} (p : pre) (q : cont A) : spec A := 
  (p, fun i y m => p i -> q y m).Notation "'DHT' [ this , W ] ( p , q ) " := 
  (DTbin this W (binarify p q)) (at level 0, 
   format "'[hv ' DHT  [ this , W ]  ( '[' p , '/' q ']' ) ']'").(* A unary Hoare-style specification  *)
Notation "{ x .. y }, 'DHT' [ this , W ] ( p , q )" :=
  (DTbin this W (logvar (fun x => .. (logvar (fun y => binarify p q)) .. )))
   (at level 0, x binder, y binder, right associativity,
    format "'[hv ' { x .. y }, '/ ' DHT  [ this , W ]  ( '[' p , '/' q ']' ) ']'").

Lemma vrf_pre W A (e : DT this W A) i i' (k : cont A) : verify i e k -> network_rely W this i i' -> verify i' e k.