Fix loop patterns

src/testing/fixtures.rs

@@ -392,7 +392,7 @@ pub fn assert_isomorphic<G: GraphTopology, H: GraphTopology>(
         original.edge_count(),
         "other graph should have the same edge count as the original"
     );
-    for &v in vertices.iter() {
+    for &v in vertices {
         assert_eq!(
             other.degree(vertex_map(v)),
             original.degree(v),
@@ -415,7 +415,7 @@ pub fn assert_isomorphic<G: GraphTopology, H: GraphTopology>(
             "expected incidences {expected:?} of vertex {v:?} are missing in the other graph"
         );
     }
-    for &(e, u, v) in edges.iter() {
+    for &(e, u, v) in edges {
         assert_eq!(
             other.incident_vertices(edge_map(e)),
             (vertex_map(u), vertex_map(v)),

tests/dfs.rs

@@ -162,7 +162,7 @@ where
     G::Vertex: Debug,
 {
     let (graph, vertices, _, _) = G::standard();
-    for v in vertices {
+    for &v in &vertices {
         assert!(
             algorithms::dfs_find(&graph, vertices[0], v),
             "vertex {v:?} should be reachable from {:?}",