Merge #145

145: Remove Neg for BigUint r=cuviper a=cuviper

A panicking implementation is useless, or worse because it still
satisfies `T: Neg`. This artifact dates back to when `BigUint` was still
in the standard library, but the rest of the primitive unsigned `Neg`
implementations were removed before Rust 1.0.

Co-authored-by: Josh Stone <[email protected]>

Author: bors[bot]

src/biguint.rs

@@ -12,7 +12,7 @@ use core::iter::{Product, Sum};
 use core::mem;
 use core::ops::{
     Add, AddAssign, BitAnd, BitAndAssign, BitOr, BitOrAssign, BitXor, BitXorAssign, Div, DivAssign,
-    Mul, MulAssign, Neg, Rem, RemAssign, Shl, ShlAssign, Shr, ShrAssign, Sub, SubAssign,
+    Mul, MulAssign, Rem, RemAssign, Shl, ShlAssign, Shr, ShrAssign, Sub, SubAssign,
 };
 use core::str::{self, FromStr};
 use core::{f32, f64};
@@ -1495,24 +1495,6 @@ impl Rem<BigUint> for u128 {
     }
 }
 
-impl Neg for BigUint {
-    type Output = BigUint;
-
-    #[inline]
-    fn neg(self) -> BigUint {
-        panic!()
-    }
-}
-
-impl<'a> Neg for &'a BigUint {
-    type Output = BigUint;
-
-    #[inline]
-    fn neg(self) -> BigUint {
-        panic!()
-    }
-}
-
 impl CheckedAdd for BigUint {
     #[inline]
     fn checked_add(&self, v: &BigUint) -> Option<BigUint> {