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var g: int;
var h: int;
procedure foo()
modifies g, h;
ensures b0() || old(g) == g;
{
call AcquireLock();
call ReleaseLock();
}
procedure AcquireLock()
modifies g, h;
ensures b1() || old(g) == g;
{
h := g;
g := 1;
}
procedure ReleaseLock()
modifies g, h;
ensures b2() || old(g) == g;
{
g := h;
}
procedure main()
modifies g, h;
{
g := 0;
call foo();
assert Assert() || g == 0;
}
function {:existential true} b0(): bool;
function {:existential true} b1(): bool;
function {:existential true} b2(): bool;
function {:existential true} Assert(): bool;
// Expected: Assert = false, b0 = false, b1 = true, b2 = true
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