CristalCaveGem » LustreC

node Sofar( X : bool ) returns ( Sofar : bool );

let

    Sofar = X -> X and pre Sofar;

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node Age (p: bool) returns (age_of_p: int);

let

 age_of_p = 0 -> if pre(p) then pre(age_of_p) + 1 else 0;

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node top (k0: int; p, q, r, t : bool) returns (OK: bool);

var k: int;

    env : bool;

let

    k = k0-> pre(k);

    env = Sofar((k>=1) and (Age(p)>=k => q)  and (Age(r)>=k => t));

    OK = env => ((Age(p and r)>=k) => (q and t));

  --%MAIN;

  --%PROPERTY  OK=true;

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