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var a:int;
procedure Allocate() returns ({:linear "tid"} xls: int);
procedure {:entrypoint} {:yields} main()
{
var {:linear "tid"} i: int;
var {:linear "tid"} j: int;
call i := Allocate();
call j := Allocate();
par i := t(i) | j := t(j);
}
procedure {:yields} {:stable} t({:linear "tid"} i': int) returns ({:linear "tid"} i: int)
{
i := i';
call Yield();
assert a == old(a);
a := a + 1;
}
procedure {:yields} Yield()
{
yield;
}
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