Remove the Zero trait

Unused.

Author: Thomasdezeeuw

src/utils.rs

@@ -20,16 +20,3 @@ macro_rules! one {
 }
 
 one! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }
-
-#[doc(hidden)]
-pub trait Zero {
-    fn zero() -> Self;
-}
-
-macro_rules! zero {
-    ($($t:ident)*) => ($(
-        impl Zero for $t { fn zero() -> $t { 0 } }
-    )*)
-}
-
-zero! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }