Attempt at fixing E0411 on older rust versions

traits/src/identities.rs

@@ -51,7 +51,7 @@ zero_impl!(i64,   0i64);
 zero_impl!(f32, 0.0f32);
 zero_impl!(f64, 0.0f64);
 
-impl<T: Zero + PartialEq> Zero for Wrapping<T> where Self: Add<Output=Self> {
+impl<T: Zero + PartialEq> Zero for Wrapping<T> where Wrapping<T>: Add<Output=Wrapping<T>> {
     fn is_zero(&self) -> bool {
         self.0 == T::zero()
     }
@@ -105,7 +105,7 @@ one_impl!(i64,   1i64);
 one_impl!(f32, 1.0f32);
 one_impl!(f64, 1.0f64);
 
-impl<T: One> One for Wrapping<T> where Self: Add<Output=Self> + Mul<Output=Self> {
+impl<T: One> One for Wrapping<T> where Wrapping<T>: Add<Output=Wrapping<T>> + Mul<Output=Wrapping<T>> {
     fn one() -> Self {
         Wrapping(T::one())
     }

traits/src/lib.rs

@@ -76,9 +76,9 @@ macro_rules! int_trait_impl {
 int_trait_impl!(Num for usize u8 u16 u32 u64 isize i8 i16 i32 i64);
 
 impl<T: Num> Num for Wrapping<T>
-    where Self: Zero + One
-        + Add<Output = Self> + Sub<Output = Self>
-        + Mul<Output = Self> + Div<Output = Self> + Rem<Output = Self>
+    where Wrapping<T>: Zero + One
+        + Add<Output = Wrapping<T>> + Sub<Output = Wrapping<T>>
+        + Mul<Output = Wrapping<T>> + Div<Output = Wrapping<T>> + Rem<Output = Wrapping<T>>
 {
     type FromStrRadixErr = T::FromStrRadixErr;
     fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {