v/vlib/v/checker/tests/fn_arg_of_optional_err.out

vlib/v/checker/tests/fn_arg_of_optional_err.vv:1:19: error: optional type argument is not supported currently
    1 | fn optional_arg(x ?int) {
      |                   ^
    2 |     println('int type: $x')
    3 | }