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fn main() {
let mut x: Option<isize> = None;
match x {
None => {
// Note: on this branch, no borrow has occurred.
x = Some(0);
}
Some(ref i) => {
// But on this branch, `i` is an outstanding borrow
x = Some(*i+1); //~ ERROR cannot assign to `x` because it is borrowed
drop(i);
}
}
x.clone(); // just to prevent liveness warnings
}
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