message: rust: allow unknown_lints
  ... because `ellipsis_inclusive_range_patterns` isn't recognized in
  older versions of Rust.
diff: @@ -518,7 +518,7 @@ another matching engine with fixed memory requirements.
  */
  #![deny(missing_docs)]
  -#![allow(ellipsis_inclusive_range_patterns)]
  +#![allow(unknown_lints, ellipsis_inclusive_range_patterns)]
  #![cfg_attr(test, deny(warnings))]
  #![cfg_attr(feature = "pattern", feature(pattern))]
  