7 files changed, 8 insertions, 8 deletions
diff --git a/src/dynamics/joint/impulse_joint/impulse_joint_set.rs b/src/dynamics/joint/impulse_joint/impulse_joint_set.rs
index 3f9835e..3331822 100644
--- a/src/dynamics/joint/impulse_joint/impulse_joint_set.rs
+++ b/src/dynamics/joint/impulse_joint/impulse_joint_set.rs
@@ -36,7 +36,7 @@ pub(crate) type JointIndex = usize;
 pub(crate) type JointGraphEdge = crate::data::graph::Edge<ImpulseJoint>;
 
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone, Default)]
+#[derive(Clone, Default, Debug)]
 /// A set of impulse_joints that can be handled by a physics `World`.
 pub struct ImpulseJointSet {
     rb_graph_ids: Coarena<RigidBodyGraphIndex>,
diff --git a/src/dynamics/joint/multibody_joint/multibody.rs b/src/dynamics/joint/multibody_joint/multibody.rs
index 6859fd9..f05ce75 100644
--- a/src/dynamics/joint/multibody_joint/multibody.rs
+++ b/src/dynamics/joint/multibody_joint/multibody.rs
@@ -62,7 +62,7 @@ fn concat_rb_mass_matrix(
 
 /// An articulated body simulated using the reduced-coordinates approach.
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct Multibody {
     // TODO: serialization: skip the workspace fields.
     pub(crate) links: MultibodyLinkVec,
diff --git a/src/dynamics/joint/multibody_joint/multibody_joint_set.rs b/src/dynamics/joint/multibody_joint/multibody_joint_set.rs
index 67df159..694e2ff 100644
--- a/src/dynamics/joint/multibody_joint/multibody_joint_set.rs
+++ b/src/dynamics/joint/multibody_joint/multibody_joint_set.rs
@@ -86,7 +86,7 @@ impl Default for MultibodyLinkId {
 #[derive(Default)]
 /// A set of rigid bodies that can be handled by a physics pipeline.
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct MultibodyJointSet {
     pub(crate) multibodies: Arena<Multibody>, // NOTE: a Slab would be sufficient.
     pub(crate) rb2mb: Coarena<MultibodyLinkId>,
diff --git a/src/dynamics/joint/multibody_joint/multibody_link.rs b/src/dynamics/joint/multibody_joint/multibody_link.rs
index bf6d605..611cb49 100644
--- a/src/dynamics/joint/multibody_joint/multibody_link.rs
+++ b/src/dynamics/joint/multibody_joint/multibody_link.rs
@@ -6,7 +6,7 @@ use crate::prelude::RigidBodyVelocity;
 
 /// One link of a multibody.
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, Debug)]
 pub struct MultibodyLink {
     // FIXME: make all those private.
     pub(crate) internal_id: usize,
@@ -104,7 +104,7 @@ impl MultibodyLink {
 
 // FIXME: keep this even if we already have the Index2 traits?
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub(crate) struct MultibodyLinkVec(pub Vec<MultibodyLink>);
 
 impl MultibodyLinkVec {
diff --git a/src/dynamics/joint/multibody_joint/multibody_workspace.rs b/src/dynamics/joint/multibody_joint/multibody_workspace.rs
index 767d751..3bad390 100644
--- a/src/dynamics/joint/multibody_joint/multibody_workspace.rs
+++ b/src/dynamics/joint/multibody_joint/multibody_workspace.rs
@@ -4,7 +4,7 @@ use na::DVector;
 
 /// A temporary workspace for various updates of the multibody.
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub(crate) struct MultibodyWorkspace {
     pub accs: Vec<RigidBodyVelocity>,
     pub ndofs_vec: DVector<Real>,
diff --git a/src/geometry/collider_set.rs b/src/geometry/collider_set.rs
index cb0511e..3934472 100644
--- a/src/geometry/collider_set.rs
+++ b/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>,
diff --git a/src/geometry/interaction_graph.rs b/src/geometry/interaction_graph.rs
index a237a69..4d037d1 100644
--- a/src/geometry/interaction_graph.rs
+++ b/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>,
 }