diff --git a/rust/prop_grid_rs/src/grid.rs b/rust/prop_grid_rs/src/grid.rs
index c1a70591..258cc4ba 100644
--- a/rust/prop_grid_rs/src/grid.rs
+++ b/rust/prop_grid_rs/src/grid.rs
@@ -94,7 +94,7 @@ pub fn hrdps_only_points() -> Vec<(f64, f64)> {
 
 #[inline]
 fn in_conus_bbox(lat: f64, lon: f64) -> bool {
-    lat >= LAT_MIN && lat <= LAT_MAX && lon >= LON_MIN && lon <= LON_MAX
+    (LAT_MIN..=LAT_MAX).contains(&lat) && (LON_MIN..=LON_MAX).contains(&lon)
 }
 
 /// Matches Elixir's `Float.round(x, 3)` — banker's rounding isn't used,
diff --git a/rust/prop_grid_rs/src/pipeline.rs b/rust/prop_grid_rs/src/pipeline.rs
index c4d3df7a..8cd1c79c 100644
--- a/rust/prop_grid_rs/src/pipeline.rs
+++ b/rust/prop_grid_rs/src/pipeline.rs
@@ -424,16 +424,15 @@ fn backfill_dpt_from_depr(cell: &mut CellValues) {
     // two passes so the iteration in pass 1 isn't invalidated by the
     // mutation in pass 2.
     let pending: Vec<(std::sync::Arc<str>, f32)> = cell
-        .iter()
-        .filter_map(|(key, _)| {
+        .keys()
+        .filter_map(|key| {
             let depr_key = key.strip_prefix("DEPR:")?;
-            let tmp_key = format!("TMP:{}", depr_key);
-            let dpt_key: std::sync::Arc<str> = format!("DPT:{}", depr_key).into();
+            let tmp_key: std::sync::Arc<str> = format!("TMP:{depr_key}").into();
+            let dpt_key: std::sync::Arc<str> = format!("DPT:{depr_key}").into();
             if cell.contains_key(&dpt_key) {
                 return None;
             }
-            let tmp_lookup: std::sync::Arc<str> = tmp_key.into();
-            let tmp = cell.get(&tmp_lookup).copied()?;
+            let tmp = cell.get(&tmp_key).copied()?;
             let depr = cell.get(key).copied()?;
             Some((dpt_key, tmp - depr))
         })