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var a:[int]int;
procedure {:entrypoint} main()
{
var {:linear "tid"} i: int;
var {:linear "tid"} j: int;
call i := t(i) | j := t(j);
call i := u(i) | j := u(j);
}
procedure t({:linear "tid"} i': int) returns ({:linear "tid"} i: int)
{
assume i == i';
a[i] := 42;
call i := Yield(i);
assert a[i] == 42;
}
procedure u({:linear "tid"} i': int) returns ({:linear "tid"} i: int)
{
assume i == i';
a[i] := 42;
yield;
assert a[i] == 42;
}
procedure Yield({:linear "tid"} i': int) returns ({:linear "tid"} i: int)
ensures i == i';
ensures old(a)[i] == a[i];
{
assume i == i';
yield;
assert old(a)[i] == a[i];
}
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