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 |     }
