Stdle #132 · closures · 2026-10-16
What does this Rust snippet output?
A past puzzle — fully playable. 4 attempts, hints on wrong guesses.
fn counter() -> impl FnMut() -> i32 { let mut n = 0; move || { n += 1; n }}fn main() { let mut c = counter(); println!("{} {} {}", c(), c(), c());}Closures