Rust Fibonacci one-liner

/// Rust Fibonacci one-liner using `fold`
///
/// Not very practical: only for one time use,
/// since it will have to re-calculate all terms again and again
/// if used in a loop to create multiple items.
/// The use of `_` also suggests this is not an ideal solution.
fn main() {
    let n = 10;
    let x = (0..n).fold((0, 1), |x, _| (x.0+x.1, x.0)).0;
    println!("{}: {}", n, x);
}