vlib/v/checker/tests/for_in_invalid_identifier.vv:2:26: error: undefined ident: `s`
    1 | fn main() {
    2 |     for index, mut value in s.statements {
      |                             ^
    3 |         println('Hello ${index} ${value}')
    4 |     }
vlib/v/checker/tests/for_in_invalid_identifier.vv:2:28: error: `s` does not return a value
    1 | fn main() {
    2 |     for index, mut value in s.statements {
      |                               ~~~~~~~~~~
    3 |         println('Hello ${index} ${value}')
    4 |     }
vlib/v/checker/tests/for_in_invalid_identifier.vv:3:29: error: no known default format for type `void`
    1 | fn main() {
    2 |     for index, mut value in s.statements {
    3 |         println('Hello ${index} ${value}')
      |                                   ~~~~~
    4 |     }
    5 | }