message: add lifetime annotations
diff: @@ -1007,7 +1007,7 @@ forward_all_scalar_binop_to_val_val!(impl Rem<u64> for BigUint, rem);
  #[cfg(has_i128)]
  forward_all_scalar_binop_to_val_val!(impl Rem<u128> for BigUint, rem);
  -impl Rem<u32> for &BigUint {
  +impl<'a> Rem<u32> for &'a BigUint {
  type Output = BigUint;
  #[inline]
  @@ -1022,11 +1022,11 @@ impl RemAssign<u32> for BigUint {
  }
  }
  -impl Rem<&BigUint> for u32 {
  +impl<'a> Rem<&'a BigUint> for u32 {
  type Output = BigUint;
  #[inline]
  - fn rem(mut self, other: &BigUint) -> BigUint {
  + fn rem(mut self, other: &'a BigUint) -> BigUint {
  self %= other;
  From::from(self)
  }
  