vlib/v/parser/tests/option_sum_type_return_err.vv:1:22: warning: inline sum types have been deprecated and will be removed on January 1, 2023 due to complicating the language and the compiler too much; define named sum types with `type Foo = Bar | Baz` instead
    1 | fn option_sumtype() ?string | int {
      |                      ~~~~~~
    2 |     return 0
    3 | }
vlib/v/parser/tests/option_sum_type_return_err.vv:1:21: error: an inline sum type cannot be an Option
    1 | fn option_sumtype() ?string | int {
      |                     ~~~~~~~~~~~~~
    2 |     return 0
    3 | }