Error "cannot move out of index of" in Rust: what does it mean and how to fix it?

Hi! I started learning Rust and encountered an unclear error when working with a vector. I have a `User` struct, and I'm trying to extract an element from the vector by index to pass it to a function that takes ownership. Here's my code: ```rust struct User { name: String, age: u32, } fn process_user(user: User) { println!("Processing user: {}", user.name); } fn main() { let mut users = vec![ User { name: "Alice".to_string(), age: 30 }, User { name: "Bob".to_string(), age: 25 }, ]; let first_user = users[0]; // Error: cannot move out of index of `Vec` process_user(first_user); } ``` The compiler gives: `error[E0507]: cannot move out of index of 'Vec'`. I understand that Rust strictly controls ownership, but