1-minute brain exercise with clever Rust

Tired of reading long Rust documentation? Learn how smart Rust is in 1 min. Let’s dive in: 1 let mut x = 10 ; // Create a mutable variable 2 let y = & mut x ; // Borrow it mutably 3 println! ( "{}" , x ); // Access the variable directly 4 // println!("{}", y); // Uncommenting this will cause an error in line 3! Here’s the cool part: Line 3 prints x just fine. But if you uncomment line 4, Rust will throw an error at line 3 . Why? Because Rust checks if y will be used later, and if it will, it