vlib/v/checker/tests/option_ptr_without_unwrapp_err.vv:6:12: error: cannot use `?&Node` as `Node`, it must be unwrapped first in argument 1 to `set_trace`
    4 | 
    5 | fn set_trace(n Node) {
    6 |     set_trace(n.parent)
      |               ~~~~~~~~
    7 | }
    8 |