pub fn apply_caves_supplement<'a>(
    dynamic_rng: &mut impl Rng,
    wpos2d: Vec2<i32>,
    get_column: impl FnMut(Vec2<i32>) -> Option<&'a ColumnSample<'a>>,
    vol: &(impl BaseVol<Vox = Block> + RectSizedVol + ReadVol + WriteVol),
    index: IndexRef<'_>,
    supplement: &mut ChunkSupplement
)