fn main() {
	names := ['aaa', 'bbb', 'ccc']

	name1 := names.sorted_with_compare(sort_by_file_base)
	println(name1)

	name2 := names.sorted_with_compare(22)
	println(name2)
}

fn sort_by_file_base(a string, b string) int {
	return int(a > b)
}

PS D:\Test\v\tt1> v run .
tt1.v:11:24: error: sorted_with_compare callback function parameter `a` with type `string` should be `&string`
    9 | }
   10 | 
   11 | fn sort_by_file_base(a string, b string) int {
      |                        ~~~~~~
   12 |     return int(a > b)
   13 | }
tt1.v:11:34: error: sorted_with_compare callback function parameter `b` with type `string` should be `&string`
    9 | }
   10 | 
   11 | fn sort_by_file_base(a string, b string) int {
      |                                  ~~~~~~
   12 |     return int(a > b)
   13 | }
tt1.v:4:37: error: cannot use `fn (string, string) int` as `fn (voidptr, voidptr) int` in argument 1 to `[]string.sorted_with_compare`
    2 |     names := ['aaa', 'bbb', 'ccc']
    3 | 
    4 |     name1 := names.sorted_with_compare(sort_by_file_base)
      |                                        ~~~~~~~~~~~~~~~~~
    5 |     println(name1)
    6 |
Details: expected argument 1 to be a pointer, but the passed argument 1 is NOT a pointer
tt1.v:7:37: error: cannot use `int literal` as `fn (voidptr, voidptr) int` in argument 1 to `[]string.sorted_with_compare`
    5 |     println(name1)
    6 | 
    7 |     name2 := names.sorted_with_compare(22)
      |                                        ~~
    8 |     println(name2)
    9 | }