vlib/v/checker/tests/array_filter_map_array_expression_as_argument_err.vv:24:19: error: array append cannot be used in an expression
   22 |         for k, v in current.kids {
   23 |             _ = visited[k] or {
   24 |                 v.map(horizon << it)
      |                               ~~
   25 |                 true
   26 |             }
