vlib/v/checker/tests/callback_bound_mut_ref_err.vv:14:11: error: `show_entered_text(mut state)` (no value) used as value in argument 1 to `register`
   12 | fn main() {
   13 |     mut state := &State{}
   14 |     register(show_entered_text(mut state))
      |              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   15 | }