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procedure {:checksum "-1"} Callee();
implementation {:id "Callee"} {:checksum "0"} Callee()
{
var r: int;
call r := Sum(42);
assert r != 0;
}
procedure {:checksum "1"} Sum(n: int) returns (r: int);
requires 0 <= n;
ensures n != 0 ==> 1 <= r;
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