macro_rules! wrap {
    ($expr:expr) => {
        match $expr {
            expr => {
                println!("...");
                expr
            }
        }
    }
}

fn foo(a: i32) {
    println!("{}", a);
}

fn run_foo<F: Fn(i32)>(f: F) {
    f(5)
}

fn bar(a: &str) {
    println!("{}", a);
}

fn run_bar<F: Fn(&str)>(f: F) {
    f("abc")
}

fn main() {
    run_foo(foo);
    run_bar(bar);

    run_foo(wrap!(foo));
    run_bar(wrap!(bar));
}