vlib/v/checker/tests/filter_func_return_nonbool_err.vv:2:2: warning: unused variable: `list`
    1 | fn main() {
    2 |     list := [1,2,3].filter(stringsss(it))
      |     ~~~~
    3 | }
    4 |
vlib/v/checker/tests/filter_func_return_nonbool_err.vv:2:25: error: type mismatch, `stringsss` must return a bool
    1 | fn main() {
    2 |     list := [1,2,3].filter(stringsss(it))
      |                            ~~~~~~~~~~~~~
    3 | }
    4 |
