[`unimplemented`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#unimplemented
[`unit_arg`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#unit_arg
[`unit_cmp`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#unit_cmp
+[`unknown_clippy_lints`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#unknown_clippy_lints
[`unnecessary_cast`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#unnecessary_cast
[`unnecessary_filter_map`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#unnecessary_filter_map
[`unnecessary_fold`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#unnecessary_fold