Rust: How do you implement Clone and Copy?

1#[derive(Clone)]
2struct MyString {
3    data: String,
4}
5
6let a = MyString { data: "hello".into() };
7let b = a.clone();
8
9#[derive(Copy, Clone)]
10struct Point {
11    x: f64,
12    y: f64,
13}
14
15let a = Point { x: 1.0, y: 2.0 };
16let b = a;  // Implicit copy
17println!("{} {}", a.x, b.x);  // Both valid