diff --git a/app-proto/src/assembly.rs b/app-proto/src/assembly.rs
index 0d2a510..0264b75 100644
--- a/app-proto/src/assembly.rs
+++ b/app-proto/src/assembly.rs
@@ -688,7 +688,9 @@ impl Assembly {
     }
     
     pub fn try_insert_element(&self, elt: impl Element + 'static) -> bool {
-        let can_insert = self.elements_by_id.with_untracked(|elts_by_id| !elts_by_id.contains_key(elt.id()));
+        let can_insert = self.elements_by_id.with_untracked(
+            |elts_by_id| !elts_by_id.contains_key(elt.id())
+        );
         if can_insert {
             self.insert_element_unchecked(elt);
         }
@@ -956,7 +958,7 @@ mod tests {
     
     #[test]
     #[should_panic(expected = "Subject \"sphere1\" must be indexed before \
-inversive distance regulator writes problem data")]
+        inversive distance regulator writes problem data")]
     fn unindexed_subject_test_inversive_distance() {
         let _ = create_root(|| {
             let subjects = [0, 1].map(