error: unused variable: `rough`
  --> $DIR/invalid-sugg-for-unused-fn-arg-147303.rs:10:12
   |
LL |     fn fun(rough: i32) {}
   |            ^^^^^ help: if this is intentional, prefix it with an underscore: `_rough`
   |
note: the lint level is defined here
  --> $DIR/invalid-sugg-for-unused-fn-arg-147303.rs:3:29
   |
LL | #![deny(unused_assignments, unused_variables)]
   |                             ^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error

