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//@ run-pass
#![allow(unused_assignments)]
#![allow(non_camel_case_types)]
#![allow(unused_variables)]
enum option<T> { some(#[allow(dead_code)] Box<T>), none, }
pub fn main() {
let mut a: option<isize> = option::some::<isize>(Box::new(10));
a = option::none::<isize>;
}
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