False positive with `prefer_void_to_null`

[eernstg]

Consider the following program:

void main() {
  List<(int?, int?)> xs = <(Null, int)>[];
}

This program causes the lint prefer_void_to_null to flag the use of the type Null, and it is suggested that it should be replaced by void.

This is a false positive: List<(void, int)> is not a subtype of List<(int?, int?)> and hence the suggested change would turn the program into a compile-time error.

The expected behavior would be that this occurrence of Null is not linted.

[pq]

Thanks!