vlib/v/checker/tests/wrong_shift_left_option_err.vv:7:4: error: unwrapped Option cannot be used in an infix expression
    5 | fn main() {
    6 |     mut a := ?[]SomeStruct([SomeStruct{}, SomeStruct{}]) // struct type
    7 |     a << []SomeStruct{len: 20}
      |       ~~
    8 |     mut b := ?[]int([2, 8]) // primitive type
    9 |     b << [1, 3, 4]
vlib/v/checker/tests/wrong_shift_left_option_err.vv:9:4: error: unwrapped Option cannot be used in an infix expression
    7 |     a << []SomeStruct{len: 20}
    8 |     mut b := ?[]int([2, 8]) // primitive type
    9 |     b << [1, 3, 4]
      |       ~~
   10 |     dump(a?.len)
   11 |     dump(b)
