i128 is not Unsigned

src/sign.rs

@@ -187,7 +187,7 @@ macro_rules! empty_trait_impl {
 
 empty_trait_impl!(Unsigned for usize u8 u16 u32 u64);
 #[cfg(feature = "i128")]
-empty_trait_impl!(Unsigned for u128 i128);
+empty_trait_impl!(Unsigned for u128);
 
 impl<T: Unsigned> Unsigned for Wrapping<T> where Wrapping<T>: Num {}