vlib/v/checker/tests/sum_type_infix_err.vv:5:9: error: cannot use operator `+` with `Abc`
    3 | fn main() {
    4 |     x := Abc(0)
    5 |     _ := x + Abc(5)
      |            ^
    6 |     _ := 123 + x
    7 |     _ = unsafe{&x + 5}
vlib/v/checker/tests/sum_type_infix_err.vv:6:11: error: cannot use operator `+` with `Abc`
    4 |     x := Abc(0)
    5 |     _ := x + Abc(5)
    6 |     _ := 123 + x
      |              ^
    7 |     _ = unsafe{&x + 5}
    8 | }
vlib/v/checker/tests/sum_type_infix_err.vv:6:7: error: infix expr: cannot use `Abc` (right expression) as `int literal`
    4 |     x := Abc(0)
    5 |     _ := x + Abc(5)
    6 |     _ := 123 + x
      |          ~~~~~~~
    7 |     _ = unsafe{&x + 5}
    8 | }
