chore: clippy happy

[mattsse]

error: lint group `rust_2018_idioms` has the same priority (0) as a lint
   --> Cargo.toml:109:6
    |
108 | rust.unused_must_use = "deny"
    |      --------------- has the same priority as this lint
109 | rust.rust_2018_idioms = "deny"
    |      ^^^^^^^^^^^^^^^^   ------ has an implicit priority of 0
    |
    = note: the order of the lints in the table is ignored by Cargo
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#lint_groups_priority
    = note: `#[deny(clippy::lint_groups_priority)]` on by default
help: to have lints override the group set `rust_2018_idioms` to a lower priority
    |
109 | rust.rust_2018_idioms = { level = "deny", priority = -1 }

[shekhirin]

fixing more issues

[DaniPopes]

this is wrong

[mattsse]

what is correct?

[mattsse]

I guess there should be a new line?
@shekhirin