message: Try to fix build on Rust 1.8
diff: @@ -800,7 +800,7 @@ fn test_binomial() {
  fn test_multinomial() {
  macro_rules! check_binomial {
  ($t:ty, $k:expr) => { {
  - let n: $t = $k.iter().sum();
  + let n: $t = $k.iter().fold(0, |acc, &x| acc + x);
  let k: &[$t] = $k;
  assert_eq!(k.len(), 2);
  assert_eq!(multinomial(k), binomial(n, k[0]));
  