vlib/v/checker/tests/index_of_option_err.vv:6:7: error: type `?[]int` is an Option, it must be unwrapped with `func()?`, or use `func() or {default}`
    4 | 
    5 | fn main() {
    6 |     a := abc()[0] or { 5 }
      |          ~~~~~
    7 |     dump(a)
    8 | }