ivy/test/trace3.ivy

#lang ivy1.7

type t
var p(X:t) : bool
var q : bool

var y : t

after init {
   p(X) := true
}

action a(x:t) = {
    if q & x ~= y {
        p(x) := false
    }
    else {
        q := true
    }
}

invariant p(X)


export a