rust-clippy/tests/ui/duplicate_underscore_argument.stderr

error: `darth` already exists, having another argument having almost the same name makes code comprehension and documentation more difficult
  --> tests/ui/duplicate_underscore_argument.rs:4:23
   |
LL | fn join_the_dark_side(darth: i32, _darth: i32) {}
   |                       ^^^^^
   |
   = note: `-D clippy::duplicate-underscore-argument` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::duplicate_underscore_argument)]`

error: aborting due to 1 previous error