vlib/v/checker/tests/generic_interface_missing_type_names_err.vv:16:17: error: generic interface `Output` must specify type parameter, e.g. Output[int]
   14 |
   15 | fn main() {
   16 |   mut outs := []Output{}
      |                 ~~~~~~
   17 |   outs << Coil { name: 'outhole' }
   18 |   outs << Light { name: 'shoot again' }
