gistfile1.txt

struct MyData { pub x: usize }

fn process<F>(mut callback: F)
        where F : FnMut(MyData) {
        
    for n in 0..10 {
        let data = MyData { x: n };
        
        callback(data);
    }
}



fn main() {

    let mut list = Vec::new();

    process(|data| {
    
        println!("{:?}", data.x);

        list.push(data.x);
    });
		
    println!("{:?}", list);
}