warning: this argument is a mutable reference, but not used mutably
  --> src/util/io.rs:14:56
   |
14 | pub(crate) async fn read_async<R>(reader: &mut R, buf: &mut [u8]) -> Result<usize>
   |                                                        ^^^^^^^^^ help: consider changing to: `&[u8]`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut
   = note: `#[warn(clippy::needless_pass_by_ref_mut)]` implied by `#[warn(clippy::all)]`

warning: this `impl` can be derived
  --> src/config/redirect.rs:19:1
   |
19 | / impl Default for RedirectPolicy {
20 | |     fn default() -> Self {
21 | |         RedirectPolicy::None
22 | |     }
23 | | }
   | |_^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#derivable_impls
   = note: `#[warn(clippy::derivable_impls)]` implied by `#[warn(clippy::all)]`
   = help: remove the manual implementation...
help: ...and instead derive it...
   |
5  + #[derive(Default)]
6  | pub enum RedirectPolicy {
   |
help: ...and mark the default variant
   |
10 ~     #[default]
11 ~     None,
   |

warning: the borrowed expression implements the required traits
   --> src/handler.rs:170:42
    |
170 |         easy.get_mut().span.record("id", &id);
    |                                          ^^^ help: change this to: `id`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrows_for_generic_args
note: the lint level is defined here
   --> src/lib.rs:240:5
    |
240 |     clippy::all
    |     ^^^^^^^^^^^
    = note: `#[warn(clippy::needless_borrows_for_generic_args)]` implied by `#[warn(clippy::all)]`