vlib/v/checker/tests/res_use_outside_defer.vv:2:10: error: `res` can only be used in defer blocks
    1 | fn test() string {
    2 |     println($res())
      |             ~~~~~~
    3 |     return 'test'
    4 | }
vlib/v/checker/tests/res_use_outside_defer.vv:2:2: error: `println` can not print void expressions
    1 | fn test() string {
    2 |     println($res())
      |     ~~~~~~~~~~~~~~~
    3 |     return 'test'
    4 | }