Rust by Example中文

fn main() { let immutable_box = Box::new(5u32); println!("immutable_box contains {}", immutable_box); // Mutability error //*immutable_box = 4; // *Move* the box, changing the ownership (and mutability) let mut mutable_box = immutable_box; println!("mutable_box contains {}", mutable_box); // Modify the contents of the box *mutable_box = 4; println!("mutable_box now contains {}", mutable_box); }