File: fn-variance-1.rs

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rustc 1.87.0%2Bdfsg1-1
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fn takes_imm(x: &isize) { }

fn takes_mut(x: &mut isize) { }

fn apply<T, F>(t: T, f: F) where F: FnOnce(T) {
    f(t)
}

fn main() {
    apply(&3, takes_imm);
    apply(&3, takes_mut);
    //~^ ERROR type mismatch

    apply(&mut 3, takes_mut);
    apply(&mut 3, takes_imm);
    //~^ ERROR type mismatch
}