src/test/ui/consts/const-eval/livedrop.rs

const _: Option<Vec<i32>> = {
    let mut never_returned = Some(Vec::new());
    let mut always_returned = None; //~ ERROR destructors cannot be evaluated at compile-time

    let mut i = 0;
    loop {
        always_returned = never_returned;
        never_returned = None;

        i += 1;
        if i == 10 {
            break always_returned;
        }
    }
};

fn main() {}