message: clean up allowed lints
diff: -#![allow(unknown_lints)] // older rustc doesn't know `unused_macros`
  #![allow(unused_macros)]
  macro_rules! forward_val_val_binop {
  @@ -284,8 +283,7 @@ macro_rules! promote_scalars {
  impl $imp<$scalar> for $res {
  type Output = $res;
  - #[cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
  - #[cfg_attr(feature = "cargo-clippy", allow(cast_lossless))]
  + #[allow(clippy::cast_lossless)]
  #[inline]
  fn $method(self, other: $scalar) -> $res {
  $imp::$method(self, other as $promo)
  @@ -295,8 +293,7 @@ macro_rules! promote_scalars {
  impl $imp<$res> for $scalar {
  type Output = $res;
  - #[cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
  - #[cfg_attr(feature = "cargo-clippy", allow(cast_lossless))]
  + #[allow(clippy::cast_lossless)]
  #[inline]
  fn $method(self, other: $res) -> $res {
  $imp::$method(self as $promo, other)
  @@ -309,8 +306,7 @@ macro_rules! promote_scalars_assign {
  (impl $imp:ident<$promo:ty> for $res:ty, $method:ident, $( $scalar:ty ),*) => {
  $(
  impl $imp<$scalar> for $res {
  - #[cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
  - #[cfg_attr(feature = "cargo-clippy", allow(cast_lossless))]
  + #[allow(clippy::cast_lossless)]
  #[inline]
  fn $method(&mut self, other: $scalar) {
  self.$method(other as $promo);
  