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class N
{
var i: int;
method newN(n: N)
requires n != null;
modifies this, n;
{
n.i := 1;
i := 1;
}
method safe(n: N)
requires n != null;
modifies this;
{
i := n.i;
}
}
method m(v: int, n: N) returns (r: int)
modifies n;
ensures r == v;
{
r := v;
}
method testing1() returns (s: int)
ensures s == 3;
{
var n := new N;
return m(3, n); // methods disallowed.
}
method testing2() returns (s: int, b: int)
ensures s == 3;
{
var n := new N;
return m(3, n), 2; // methods disallowed.
}
method testing3() returns (n: N)
{
return new N.newN(n); // disallowed, as newN() modifies n
}
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