diff --git a/src/rstd/collections/avl.rs b/src/rstd/collections/avl.rs
index 8413dc9..f4a9b3d 100644
--- a/src/rstd/collections/avl.rs
+++ b/src/rstd/collections/avl.rs
@@ -50,22 +50,22 @@ impl<E: Display> Display for TreeParseError<E> {
 
 impl<E: Error> Error for TreeParseError<E> {}
 
-struct AvlNode<'a, Ctx: Context<'a>, A: Mentionable<'a, Ctx>> {
+pub struct AvlNode<'a, Ctx: Context<'a>, A: Mentionable<'a, Ctx>> {
     l: AvlTree<'a, Ctx, A>,
     r: AvlTree<'a, Ctx, A>,
     key: Rc<A>,
 }
 
-struct AvlTree<'a, Ctx: Context<'a>, A: Mentionable<'a, Ctx>> {
+pub struct AvlTree<'a, Ctx: Context<'a>, A: Mentionable<'a, Ctx>> {
     node: Nullable<'a, Ctx, AvlNode<'a, Ctx, A>>,
     height: u64,
 }
 
 #[derive(Clone)]
-struct AvlNodeFactory<F>(F);
+pub struct AvlNodeFactory<F>(F);
 
 #[derive(Clone)]
-struct AvlTreeFactory<F>(NullableFactory<AvlNodeFactory<F>>);
+pub struct AvlTreeFactory<F>(NullableFactory<AvlNodeFactory<F>>);
 
 impl<'a, Ctx: Context<'a>, A: Mentionable<'a, Ctx>> Serializable for AvlNode<'a, Ctx, A> {
     fn serialize(&self, serializer: &mut dyn Serializer) {