| error: `darth` already exists, having another argument having almost the same name makes code comprehension and documentation more difficult | |
| --> $DIR/duplicate_underscore_argument.rs:7:23 | |
| | | |
| 7 | fn join_the_dark_side(darth: i32, _darth: i32) {} | |
| | ^^^^^ | |
| | | |
| = note: `-D duplicate-underscore-argument` implied by `-D warnings` | |