{"ast_node_type":"function","tokens":[{"end":59,"kind":"keyword","start":0,"text":"fn"}]}
    fn union(&mut self, other: &ChunkedBitSet<T>) -> bool {
impl<T: Idx> BitRelations<ChunkedBitSet<T>> for ChunkedBitSet<T> {
        assert_eq!(self.domain_size, other.domain_size);