File: issue-19098.rs

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rustc 1.85.0%2Bdfsg3-1
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//@ check-pass
pub trait Handler {
    fn handle(&self, _: &mut String);
}

impl<F> Handler for F where F: for<'a, 'b> Fn(&'a mut String) {
    fn handle(&self, st: &mut String) {
        self(st)
    }
}

fn main() {}