Code shared from the Rust Playground

playground.rs

type F = fn(i32) -> i32;

fn hoge(v: &mut Vec<F>, f: F) {
    v.push(f);
}

fn fuga(i : i32) -> i32 {
    i + 10
}

fn piyo(i: i32) -> i32 {
    i * 5
}

fn main() {
    let mut v = vec![];
    hoge(&mut v, fuga);
    hoge(&mut v, piyo);
}