Code shared from the Rust Playground

playground.rs

fn main() {
    let max_usize = std::usize::MAX;

    println!("std::usize::MAX/2: {}", std::usize::MAX / 2);
    if !is_debug() {
        let overflow_release = max_usize.wrapping_add(1);
        println!("Overflow: {}", overflow_release); // Output in release: 0
    } else {
        #[warn(arithmetic_overflow)]
        #[cfg(debug_assertions)]
        let overflow_debug = max_usize + 1;
        #[cfg(debug_assertions)]
        println!("Overflow (debug): {}", overflow_debug);
    }
    // Explicit wrapping operations
    let wrapped_add = max_usize.wrapping_add(std::usize::MAX / 2 + 1);
    println!("Wrapped add: {}", wrapped_add);

    let wrapped_mul = 1_usize.wrapping_mul(std::usize::MAX / 2 + 0);
    println!("Wrapped mul: {}", wrapped_mul);
}

fn is_debug() -> bool {
    if cfg!(debug_assertions) {
        println!("Debug build.");
        true
    } else {
        println!("Release build.");
        false
    }
}