message: Remove Signed Wrapping test because Wrapping doesn't impl Neg in Rust 1.8
diff: @@ -187,27 +187,3 @@ empty_trait_impl!(Unsigned for usize u8 u16 u32 u64);
  impl<T: Unsigned> Unsigned for Wrapping<T> where Wrapping<T>: Num {}
  -
  -macro_rules! test_signed_wrapping {
  - ($($t:ty)+) => {
  - $({
  - let range = -1 as $t .. 2 as $t;
  - for i in range.clone() {
  - let w = Wrapping(i);
  - assert_eq!(signum(i), signum(w).0);
  - assert_eq!(abs(i), abs(w).0);
  - for j in range.clone() {
  - assert_eq!(abs_sub(i, j), abs_sub(w, Wrapping(j)).0);
  - }
  - assert_eq!(i.is_positive(), w.is_positive());
  - assert_eq!(i.is_negative(), w.is_negative());
  - }
  - })+
  - };
  -}
  -
  -#[test]
  -fn signed_wrapping() {
  - test_signed_wrapping!(isize i8 i16 i32 i64);
  -}
  -
  