diff --git a/src/bin/day22.rs b/src/bin/day22.rs
index e622261..5c1c030 100644
--- a/src/bin/day22.rs
+++ b/src/bin/day22.rs
@@ -292,7 +292,6 @@ impl Solution<Input, Output> for Day22 {
             let end = last_non_empty.next().unwrap_or((upper_bound, &'_')).0 as isize;
 
             boundaries.insert(constructor(i), start..end);
-            (constructor(i), start..end)
         };
 
         // construct all horizontal boundaries