vlib/v/checker/tests/string_index_non_int_err.vv:3:12: error: non-integer string index `string`
    1 | fn main() {
    2 |     v := 'foo'
    3 |     println(v['f'])
      |               ~~~
    4 |     println(v[true])
    5 |     println(v[[23]])
vlib/v/checker/tests/string_index_non_int_err.vv:4:12: error: non-integer string index `bool`
    2 |     v := 'foo'
    3 |     println(v['f'])
    4 |     println(v[true])
      |               ~~~~
    5 |     println(v[[23]])
    6 | }
vlib/v/checker/tests/string_index_non_int_err.vv:5:12: error: non-integer string index `[]int`
    3 |     println(v['f'])
    4 |     println(v[true])
    5 |     println(v[[23]])
      |               ~~~~
    6 | }