warning: casting to the same type is unnecessary (`u8` -> `u8`)
   --> src/spi.rs:326:23
    |
326 |             return Ok(self.spi.dr8().read().bits() as u8);
    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `self.spi.dr8().read().bits()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
    = note: `#[warn(clippy::unnecessary_cast)]` on by default

warning: lint `clippy::transmute_num_to_bytes` has been renamed to `unnecessary_transmutes`
   --> src/rng.rs:172:33
    |
172 |                         #[allow(clippy::transmute_num_to_bytes)]
    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unnecessary_transmutes`
...
185 | rng_core!(usize, u32, u16, u8);
    | ------------------------------ in this macro invocation
    |
    = note: `#[warn(renamed_and_removed_lints)]` on by default
    = note: this warning originates in the macro `rng_core` (in Nightly builds, run with -Z macro-backtrace for more info)