vlib/v/checker/tests/for_in_iterator_returning_multiple_values_err.vv:8:10: error: iterator method `next()` must not return multiple values
    6 | 
    7 | t := TestStruct{}
    8 | for x in t {
      |          ^
    9 |     println(x) // ('foo', 'bar')
   10 |     break