error: `ref` directly on a function argument is ignored. Consider using a reference type instead
  --> $DIR/toplevel_ref_arg_non_rustfix.rs:9:15
   |
LL | fn the_answer(ref mut x: u8) {
   |               ^^^^^^^^^
   |
   = note: `-D clippy::toplevel-ref-arg` implied by `-D warnings`

error: `ref` directly on a function argument is ignored. Consider using a reference type instead
  --> $DIR/toplevel_ref_arg_non_rustfix.rs:15:24
   |
LL |         fn fun_example(ref _x: usize) {}
   |                        ^^^^^^
...
LL |         gen_function!();
   |         --------------- in this macro invocation
   |
   = note: this error originates in the macro `gen_function` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 2 previous errors