vlib/v/checker/tests/generics_fn_callback_wrapped_arg_err.vv:6:11: error: cannot use `Default[Foo]` as `Foo` in argument 1 to `g`
    4 | 
    5 | fn f[T](g fn (x T) int) {
    6 |     assert g(Default[T]{}) == 42
      |              ~~~~~~~~~~~~
    7 | }
    8 |