More Debug derives. (#686)

src/geometry/collider_set.rs

@@ -5,7 +5,7 @@ use crate::math::Isometry;
 use std::ops::{Index, IndexMut};
 
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone, Default)]
+#[derive(Clone, Default, Debug)]
 /// A set of colliders that can be handled by a physics `World`.
 pub struct ColliderSet {
     pub(crate) colliders: Arena<Collider>,

src/geometry/interaction_graph.rs

@@ -9,7 +9,7 @@ pub type TemporaryInteractionIndex = EdgeIndex;
 
 /// A graph where nodes are collision objects and edges are contact or proximity algorithms.
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct InteractionGraph<N, E> {
     pub(crate) graph: Graph<N, E>,
 }