diff --git a/src/bits.rs b/src/bits.rs
index 82418b7d..e2f7565c 100644
--- a/src/bits.rs
+++ b/src/bits.rs
@@ -538,118 +538,6 @@ impl_bit_op!(BitOr, bitor, BitOrAssign, bitor_assign);
 impl_bit_op!(BitAnd, bitand, BitAndAssign, bitand_assign);
 impl_bit_op!(BitXor, bitxor, BitXorAssign, bitxor_assign);
 
-// impl<const BITS: usize, const LIMBS: usize> ShlAssign<usize> for Uint<BITS,
-// LIMBS> {     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shl_assign(&mut self, rhs: usize) {
-//         *self = self.wrapping_shl(rhs);
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> ShlAssign<&usize> for Uint<BITS,
-// LIMBS> {     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shl_assign(&mut self, rhs: &usize) {
-//         *self = self.wrapping_shl(*rhs);
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> Shl<usize> for Uint<BITS, LIMBS>
-// {     type Output = Self;
-
-//     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shl(self, rhs: usize) -> Self {
-//         self.wrapping_shl(rhs)
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> Shl<usize> for &Uint<BITS, LIMBS>
-// {     type Output = Uint<BITS, LIMBS>;
-
-//     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shl(self, rhs: usize) -> Self::Output {
-//         self.wrapping_shl(rhs)
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> Shl<&usize> for Uint<BITS, LIMBS>
-// {     type Output = Self;
-
-//     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shl(self, rhs: &usize) -> Self {
-//         self.wrapping_shl(*rhs)
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> Shl<&usize> for &Uint<BITS,
-// LIMBS> {     type Output = Uint<BITS, LIMBS>;
-
-//     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shl(self, rhs: &usize) -> Self::Output {
-//         self.wrapping_shl(*rhs)
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> ShrAssign<usize> for Uint<BITS,
-// LIMBS> {     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shr_assign(&mut self, rhs: usize) {
-//         *self = self.wrapping_shr(rhs);
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> ShrAssign<&usize> for Uint<BITS,
-// LIMBS> {     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shr_assign(&mut self, rhs: &usize) {
-//         *self = self.wrapping_shr(*rhs);
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> Shr<usize> for Uint<BITS, LIMBS>
-// {     type Output = Self;
-
-//     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shr(self, rhs: usize) -> Self {
-//         self.wrapping_shr(rhs)
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> Shr<usize> for &Uint<BITS, LIMBS>
-// {     type Output = Uint<BITS, LIMBS>;
-
-//     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shr(self, rhs: usize) -> Self::Output {
-//         self.wrapping_shr(rhs)
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> Shr<&usize> for Uint<BITS, LIMBS>
-// {     type Output = Self;
-
-//     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shr(self, rhs: &usize) -> Self {
-//         self.wrapping_shr(*rhs)
-//     }
-// }
-
-// impl<const BITS: usize, const LIMBS: usize> Shr<&usize> for &Uint<BITS,
-// LIMBS> {     type Output = Uint<BITS, LIMBS>;
-
-//     #[allow(clippy::inline_always)]
-//     #[inline(always)]
-//     fn shr(self, rhs: &usize) -> Self::Output {
-//         self.wrapping_shr(*rhs)
-//     }
-// }
-
 macro_rules! impl_shift {
     (@main $u:ty) => {
         impl<const BITS: usize, const LIMBS: usize> Shl<$u> for Uint<BITS, LIMBS> {