Rust has a mechanism called borrow checker that makes sure references are not used when they are not valid anymore. The borrow checker uses lifetimes to do its job internally. Let’s look at a simple example where the borrow checker detects a possibly invalid reference: 1 2 3 4 5 6 7 8 9 10 fn main() { let r; { let i = 1; r = &i; } println!(
