File: regions-escape-unboxed-closure.rs

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rustc 1.89.0%2Bdfsg1-1
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fn with_int(f: &mut dyn FnMut(&isize)) {}

fn main() {
    let mut x: Option<&isize> = None;
    with_int(&mut |y| x = Some(y));
    //~^ ERROR borrowed data escapes outside of closure
}