File: feature-gate-unboxed-closures-ufcs-calls.rs

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rustc 1.70.0%2Bdfsg1-9
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#![allow(dead_code)]

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

fn main() {}