diff --git a/engine/src/drawables/lit_mesh.rs b/engine/src/drawables/lit_mesh.rs
index a989c7c9..38454f96 100644
--- a/engine/src/drawables/lit_mesh.rs
+++ b/engine/src/drawables/lit_mesh.rs
@@ -36,8 +36,7 @@ pub fn screen_coverage(gfx: &GfxContext, s: Sphere) -> f32 {
 
     let proj_radius2 = (proj_center_side - proj_center).mag2();
 
-    let screen_area = proj_radius2 * std::f32::consts::PI;
-    screen_area
+    proj_radius2 * std::f32::consts::PI
 }
 
 #[derive(Clone, Copy, Hash)]
diff --git a/engine/src/meshload.rs b/engine/src/meshload.rs
index 29acb5e6..97cf2475 100644
--- a/engine/src/meshload.rs
+++ b/engine/src/meshload.rs
@@ -277,7 +277,7 @@ pub fn find_nodes<'a>(
             let coverage = v.get("screencoverage").map(|v| {
                 v.as_array()
                     .unwrap()
-                    .into_iter()
+                    .iter()
                     .map(|v| v.as_f64().unwrap())
                     .collect::<Vec<_>>()
             });
diff --git a/geom/src/heightmap.rs b/geom/src/heightmap.rs
index 85139836..7ef25195 100644
--- a/geom/src/heightmap.rs
+++ b/geom/src/heightmap.rs
@@ -804,7 +804,8 @@ mod erosion {
             }
 
             for c in &changed {
-                self.get_chunk_mut(*c).map(|c| c.update_max_height());
+                let Some(c) = self.get_chunk_mut(*c) else { continue; };
+                c.update_max_height();
             }
 
             changed.into_iter().collect()
diff --git a/simulation/src/utils/rand_provider.rs b/simulation/src/utils/rand_provider.rs
index e6064b03..41ea7132 100644
--- a/simulation/src/utils/rand_provider.rs
+++ b/simulation/src/utils/rand_provider.rs
@@ -91,9 +91,9 @@ impl RandProvider {
 
 // used only for the initial seed
 fn splitmix64(state: &mut u64) -> u64 {
-    *state = state.wrapping_add(0x9E3779B97f4A7C15);
+    *state = state.wrapping_add(0x9E3779B97F4A7C15);
     let mut result = *state;
     result = (result ^ (result >> 30)).wrapping_mul(0xBF58476D1CE4E5B9);
     result = (result ^ (result >> 27)).wrapping_mul(0x94D049BB133111EB);
-    return result ^ (result >> 31);
+    result ^ (result >> 31)
 }