rust 变量地址

let free_coloring_book = vec![
        "mercury",
        "venus",
        "earth",
        "mars",
        "jupiter",
        "saturn",
        "uranus",
        "neptune"
    ];
    // 1. free_coloring_book堆上数据的地址
    println!("address: {:p}", free_coloring_book.as_ptr());

    // 2. free_coloring_book栈上的地址
    let a = &free_coloring_book;
    println!("address: {:p}", a);

    let mut friends_coloring_book = free_coloring_book;

    // 3. friends_coloring_book堆上数据的地址，和1一样
    println!("address: {:p}", friends_coloring_book.as_ptr());

    // 4. friends_coloring_book栈上的地址
    let b = &friends_coloring_book;
    println!("address: {:p}", b);