Rust quiz

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What does the `mut` keyword in `let mut x` allow that plain `let` does not?

1. What does the `mut` keyword in `let mut x` allow that plain `let` does not?
2. What is a `Box<T>`?
3. What does this code do: `let s = String::from("hi"); let t = s; println!("{}", s);`?
4. `#[derive(Debug, Clone, PartialEq)]` does what?
5. What does `let mut x = 5; x = 6;` do?
6. What does this iterate: `for x in 0..5 { … }`?
7. How do you create a growable vector and push two elements?
8. How do you add methods to a struct?
9. What is "ownership" in Rust?
10. A function `fn add(a: i32, b: i32) -> i32 { a + b }` — what makes `a + b` the return value?
11. A `struct Point { x: i32, y: i32 }` is instantiated as:
12. What does `&value` produce?

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