import java.lang.Integer;
import java.util.function.Function;
import java.util.List;
import java.util.ArrayList;
import java.util.stream.Stream;

public class Bug325 {
    public main() {
      List<Integer> list = new ArrayList<>(List.of(1,2,3,4,5));
      var func = x -> x*2;
      return list.stream().map(func).toList();
   }
}