What is the mean of "value borrowed here after move"

test.rs

pub fn run() {
    // Correct One
    let hello1 = "Hello";
    let mut hello2 = String::from("Hello");

    hello2.push('\u{1f600}');
    println!("{}", hello1.len());
    println!("{}", hello2.len());
    println!("{:?}", (hello1, hello2));
}

pub fn run() {
    // Wrong One
    let hello1 = "Hello";
    let mut hello2 = String::from("Hello");
    println!("{:?}", (hello1, hello2));

    hello2.push('\u{1f600}');
    println!("{}", hello1.len());
    println!("{}", hello2.len());
}