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#![allow(dead_code)]

fn foo<F: Fn()>(mut f: F) {
    f.call(()); //~ ERROR use of unstable library feature 'fn_traits'
    f.call_mut(()); //~ ERROR use of unstable library feature 'fn_traits'
    f.call_once(()); //~ ERROR use of unstable library feature 'fn_traits'
}

fn main() {}