File: issue-11515-upcast-fn_mut-fn.rs

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rustc 1.85.0%2Bdfsg2-3
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//@ run-pass
#![feature(trait_upcasting)]

struct Test {
    func: Box<dyn FnMut() + 'static>,
}

fn main() {
    let closure: Box<dyn Fn() + 'static> = Box::new(|| ());
    let mut test = Box::new(Test { func: closure });
    (test.func)();
}