Mutability

Mutability of data can be changed when ownership is transferred.

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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);
}
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