trpl-zh-cn/listings/ch04-understanding-ownership/no-listing-10-multiple-mut-not-allowed/src/main.rs

fn main() {
    // ANCHOR: here
    let mut s = String::from("hello");

    let r1 = &mut s;
    let r2 = &mut s;

    println!("{}, {}", r1, r2);
    // ANCHOR_END: here
}