File: issue_88118.rs

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rustc 1.70.0%2Bdfsg1-9
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// Regression test for #88118. Used to ICE.
// edition:2021
// check-pass

fn foo<MsU>(handler: impl FnOnce() -> MsU + Clone + 'static) {
    Box::new(move |value| {
        (|_| handler.clone()())(value);
        None
    }) as Box<dyn Fn(i32) -> Option<i32>>;
}

fn main() {}