warning: the method `read_channel` doesn't need a mutable reference
  --> examples/adc.rs:36:42
   |
36 |         let data: u16 = adc.read_channel(&mut ch0);
   |                                          ^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
   = note: `#[warn(clippy::unnecessary_mut_passed)]` on by default

warning: call to `std::mem::drop` with a value that does not implement `Drop`. Dropping such a type only extends its contained lifetimes
   --> src/time.rs:247:9
    |
247 |         drop(dwt);
    |         ^^^^^^^^^
    |
note: argument has type `gd32f1::gd32f130::DWT`
   --> src/time.rs:247:14
    |
247 |         drop(dwt);
    |              ^^^
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#drop_non_drop
    = note: `#[warn(clippy::drop_non_drop)]` on by default

warning: this `.into_iter()` call is equivalent to `.iter_mut()` and will not consume the `slice`
   --> src/i2c.rs:662:42
    |
662 |         for (i, operation) in operations.into_iter().enumerate() {
    |                                          ^^^^^^^^^ help: call directly: `iter_mut`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
    = note: `#[warn(clippy::into_iter_on_ref)]` on by default