geo_filters: Remove dead code.

crates/geo_filters/src/diff_count.rs

@@ -2,7 +2,6 @@
 
 use std::borrow::Cow;
 use std::cmp::Ordering;
-use std::iter::Peekable;
 use std::mem::{size_of, size_of_val};
 
 use crate::config::{
@@ -346,29 +345,6 @@ impl<C: GeoConfig<Diff>> Count<Diff> for GeoDiffCount<'_, C> {
     }
 }
 
-/// Helper iterator which drops two consecutive items if they are equal.
-/// Note: this is different from the unique operation! E.g. the sequence [1, 1, 1, 2, 2]
-/// is converted by the XorIterator into the sequence [1], whereas the unique operation
-/// would output [1, 2].
-struct XorIterator<I: Iterator<Item = usize>> {
-    iter: Peekable<I>,
-}
-
-impl<I: Iterator<Item = usize>> Iterator for XorIterator<I> {
-    type Item = usize;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        loop {
-            match self.iter.next() {
-                Some(bit) if Some(&bit) == self.iter.peek() => {
-                    self.iter.next();
-                }
-                x => return x,
-            }
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use itertools::Itertools;