If you want to use it in the stable channel, just change the main() to
fn main() { let border = (SPIRAL_SIDE / 2) as i32; let (min, max) = if SPIRAL_SIDE % 2 == 0 { (-border + 1, border + 1) } else { (-border, border) }; for y in (min..max).rev() { (min..max) .into_iter() .for_each(|x| print!("{:>3} ", number_at(x, y))); println!(); } }
And no need of
#![feature(inclusive_range_syntax)]
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If you want to use it in the stable channel, just change the main() to
And no need of