vlib/v/checker/tests/generic_sumtype_decl_err_c.vv:7:27: error: generic type name `T` of generic struct `Just<T>` is not mentioned in sumtype `Maybe<B>`
    5 | struct Nothing {}
    6 |
    7 | type Maybe<B> = Nothing | Just<T>
      |                           ~~~~~~~
    8 |
    9 | fn main() {
