Error

The error "use of moved value" means you tried to use a variable after its ownership was transferred to another location. In Rust, types like String move rather than copy when assigned or passed to functions, invalidating the original variable. To fix this, pass a reference (&) instead of the value, or clone the data if you need a second owner.

fn takes_ownership(some_string: String) {
    println!("{some_string}");
}

fn main() {
    let s1 = String::from("hello");
    // Pass a reference instead of moving the value
    takes_ownership(s1.clone()); 
    // s1 is still valid here because we cloned it
    println!("{s1}");
}

The "use of moved value" error happens because Rust treats data like a physical object that can only be held by one person at a time. When you give the object to someone else (move it), you no longer have it, so you can't use it again. To fix it, you either make a photocopy (clone) or just let the other person look at it without taking it (borrow with a reference).