let (block, &first_index) = self
.statements_before_block
.iter_enumerated()
- .filter(|(_, first_index)| **first_index <= point_index)
- .last()
+ .rfind(|&(_, &first_index)| first_index <= point_index)
.unwrap();
let statement_index = (point_index - first_index) / 2;