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class Global {
static function G(x: int): int { x+x }
static method N(x: int) returns (ghost r: int)
ensures r == Global.G(x);
{
if {
case true => r := G(x+0);
case true =>
var g: Global;
r := g.G(x);
case true =>
var g: Global := null;
r := g.G(x);
case true =>
r := Global.G(x);
}
}
}
method TestCalls(k: nat) {
var g: Global, h: Global;
assume g != h;
ghost var r: int;
ghost var s := Global.G(k);
// r := Global.N(k);
// assert r == s;
r := g.N(k);
assert r == s;
r := h.N(k);
assert r == s;
g := null;
r := g.N(k);
assert r == s;
// r := Global.N(r);
if (k == 0) {
assert r == s;
} else {
// assert r == s; // error: G(k) and G(k+k) are different
}
}
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