9.在下列Rust代码空缺部分中填入相应的代码,能够正常运行( )【单选】
___①______
struct Apple{
size: i32,
}
fn borrow_apple(apple: __③___ Apple) {
println!("borrow can access variable{:?}", apple);
apple.size=20;
}
fn main() {
let mut apple:Apple = Apple {size:10};
borrow_apple(__②___ apple);
println!(" apple is alive {:?}",apple);
}