error: lint group `rust_2018_idioms` has the same priority (0) as a lint
  --> Cargo.toml:48:6
   |
46 | rust.unreachable_pub = "warn"
   |      --------------- has the same priority as this lint
47 | rust.unused_must_use = "deny"
48 | 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
   |
48 | rust.rust_2018_idioms = { level = "deny", priority = -1 }
   |                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~