vlib/v/parser/tests/fn_decl_multi_return_types_err.vv:4:10: error: multiple return types in function declaration must use parentheses, e.g. (int, string)
    2 | }
    3 |
    4 | fn foo() int, int {
      |          ~~~~~~~~
    5 |     return 0, 0
    6 | }
