vlib/v/checker/tests/generic_field_init_with_call_err.vv:12:3: error: cannot assign to field `items`: expected `map[int]u8`, not `map[int]int`
   10 | pub fn CustomSet.new[T](elements []T) CustomSet[T] {
   11 |     return CustomSet[T]{
   12 |         items: to_map[T, int, T, int](invert[T, int](from_array[T](elements)), fn [T](key T, _ int) (T, int) {
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   13 |             return key, 10000
   14 |         })