vlib/v/checker/tests/is_type_not_exist.vv:4:25: error: cannot use `any_int` as `Integer` in argument 1 to `fn_with_sum_type_param`
    2 |
    3 | fn main() {
    4 |     fn_with_sum_type_param(1)
      |                            ^
    5 | }
    6 |
vlib/v/checker/tests/is_type_not_exist.vv:8:10: error: is: type `SomethingThatDontExist` does not exist
    6 |
    7 | fn fn_with_sum_type_param(i Integer) {
    8 |     if i is SomethingThatDontExist {
      |             ~~~~~~~~~~~~~~~~~~~~~~
    9 |         println('It should fail !')
   10 |     }