vlib/v/checker/tests/array_filter_anon_fn_err_a.v:2:23: error: function needs exactly 1 argument
    1 | fn main() {
    2 |     a := [1,2,3,4].filter(fn(a int, b int) bool { return a > 0 })
      |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    3 |     println(a)
    4 | }
