vlib/v/checker/tests/array_literal_modify_err.vv:2:24: error: array append cannot be used in an expression
    1 | fn main() {
    2 |     mut nums := [1, 2, 3] << 4
      |                           ~~
    3 |     println(nums)
    4 | }
vlib/v/checker/tests/array_literal_modify_err.vv:3:2: error: `println` can not print void expressions
    1 | fn main() {
    2 |     mut nums := [1, 2, 3] << 4
    3 |     println(nums)
      |     ~~~~~~~~~~~~~
    4 | }