File: higher-ranked-lifetime-error.rs

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rustc 1.89.0%2Bdfsg1-1
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fn assert_all<F, T>(_f: F)
where
    F: FnMut(&String) -> T,
{
}

fn id(x: &String) -> &String {
    x
}

fn main() {
    assert_all::<_, &String>(id);
    //~^ ERROR implementation of `FnMut` is not general enough
}