Stdle #15 · scope · 2026-06-21

What does this Rust snippet output?

A past puzzle — fully playable. 4 attempts, hints on wrong guesses.

1fn main() {
2    let word = "rust";
3    let word = word.to_uppercase();
4    let word = word.len();
5    println!("{}", word);
6}

Scope

Answer & explanation