Rust by Example

#![feature(box_syntax)] fn main() { let immutable_box = box 5u32; println!("immutable_box contains {}", immutable_box); // Mutability error //*immutable_box = 4; // Hand over the box, changing the mutability let mut mutable_box = immutable_box; println!("mutable_box contained {}", mutable_box); // Modify the contents of the box *mutable_box = 4; println!("mutable_box now contains {}", mutable_box); }