vlib/v/checker/tests/array_filter_fn_err.vv:2:25: error: function needs exactly 1 argument
    1 | fn main() {
    2 |     a1 := [1,2,3,4].filter(fn(a int, b int) bool { return a > 0 })
      |                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    3 |     println(a1)
    4 |
vlib/v/checker/tests/array_filter_fn_err.vv:5:25: error: type mismatch, should use `fn(a int) bool {...}`
    3 |     println(a1)
    4 |
    5 |     a2 := [1,2,3,4].filter(fn(a string) bool { return a.len > 0 })
      |                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    6 |     println(a2)
    7 |
vlib/v/checker/tests/array_filter_fn_err.vv:8:18: error: function needs exactly 1 argument
    6 |     println(a2)
    7 |
    8 |     a3 := [1,2,3,4].filter(fil1)
      |                     ~~~~~~~~~~~~
    9 |     println(a3)
   10 |
vlib/v/checker/tests/array_filter_fn_err.vv:11:25: error: type mismatch, should use `fn(a int) bool {...}`
    9 |     println(a3)
   10 |
   11 |     a4 := [1,2,3,4].filter(fil2)
      |                            ~~~~
   12 |     println(a4)
   13 | }