diff --git a/src/flow/binary/bounds.rs b/src/flow/binary/bounds.rs
index 8a6df96..dfeba0d 100644
--- a/src/flow/binary/bounds.rs
+++ b/src/flow/binary/bounds.rs
@@ -6,6 +6,7 @@ pub struct Bounds<A> {
     r: Option<A>,
 }
 
+#[derive(Debug)]
 pub enum BoundsError<A> {
     BoundsViolated { l: A, r: A },
     OverflowL(A),
diff --git a/src/rstd/atomic_object.rs b/src/rstd/atomic_object.rs
index 5c01a24..174990b 100644
--- a/src/rstd/atomic_object.rs
+++ b/src/rstd/atomic_object.rs
@@ -7,7 +7,7 @@ use crate::atomic::*;
 use super::*;
 
 /// Generic implementation of a [Mentionable] for [Atomic]s.
-#[derive(Clone, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct AtomicObject<A> {
     atomic: A,
 }
diff --git a/src/rstd/collections/tree.rs b/src/rstd/collections/tree.rs
index 33fa0d3..aded9d2 100644
--- a/src/rstd/collections/tree.rs
+++ b/src/rstd/collections/tree.rs
@@ -234,15 +234,13 @@ impl<'a, Ctx: Context<'a>, A: MentionableBase<'a> + Clone> Clone for Tree<'a, Ct
 
 #[cfg(test)]
 mod tests {
-    use std::convert::Infallible;
-
     use crate::{
         flow::{
-            binary::{balancing::*, *},
+            binary::{balancing::*, bound::BoundTrees, *},
             comparator::*,
         },
         rstd::atomic_object::*,
-        testing::TestContextPlain,
+        testing::*,
     };
 
     use super::{context::*, *};
@@ -252,7 +250,7 @@ mod tests {
         TestContextPlain,
         AtomicObject<u64>,
         DefaultComparator,
-        WrappedExtra<BalancingError, Infallible>,
+        BbError<AtomicObject<u64>>,
     >;
 
     fn new_trees() -> Trees {
@@ -320,4 +318,20 @@ mod tests {
         let reference2 = trees.refer(&singular_keyed(&trees, 2)).unwrap();
         assert!(!trees.equal(&reference1, &reference2));
     }
+
+    #[test]
+    fn balanced_bound() {
+        let trees = BoundTrees::new(BalancedTrees::new(new_trees()));
+        let mut tree = trees.empty();
+        for i in [
+            8, 3, 10, 17, 0, 13, 6, 1, 11, 5, 4, 7, 18, 14, 15, 9, 2, 19, 16, 12,
+        ] {
+            tree = trees.clone().add_tree(tree, i.into()).unwrap();
+        }
+        for i in [
+            2, 9, 4, 7, 8, 10, 17, 1, 13, 15, 18, 12, 5, 0, 3, 6, 16, 19, 14, 11,
+        ] {
+            tree = trees.clone().remove(tree, i.into()).unwrap();
+        }
+    }
 }
diff --git a/src/rstd/collections/tree/context.rs b/src/rstd/collections/tree/context.rs
index 6578dd6..837e6fd 100644
--- a/src/rstd/collections/tree/context.rs
+++ b/src/rstd/collections/tree/context.rs
@@ -212,37 +212,37 @@ impl<
     }
 }
 
-#[derive(Debug)]
-pub enum WrappedExtra<W, E> {
-    Wrapped(W),
-    Extra(E),
-}
+// #[derive(Debug)]
+// pub enum WrappedExtra<W, E> {
+//     Wrapped(W),
+//     Extra(E),
+// }
 
-impl<R, E, W> From<WrappedExtra<W, E>> for TreeContextError<R, WrappedExtra<W, E>> {
-    fn from(value: WrappedExtra<W, E>) -> Self {
-        Self::Extra(value)
-    }
-}
+// impl<R, E, W> From<WrappedExtra<W, E>> for TreeContextError<R, WrappedExtra<W, E>> {
+//     fn from(value: WrappedExtra<W, E>) -> Self {
+//         Self::Extra(value)
+//     }
+// }
 
-impl<R, E> From<BalancingError> for TreeContextError<R, WrappedExtra<BalancingError, E>> {
-    fn from(value: BalancingError) -> Self {
-        WrappedExtra::Wrapped(value).into()
-    }
-}
+// impl<R, E> From<BalancingError> for TreeContextError<R, WrappedExtra<BalancingError, E>> {
+//     fn from(value: BalancingError) -> Self {
+//         WrappedExtra::Wrapped(value).into()
+//     }
+// }
 
-impl<R, A, E> From<BoundsError<A>> for TreeContextError<R, WrappedExtra<BoundsError<A>, E>> {
-    fn from(value: BoundsError<A>) -> Self {
-        WrappedExtra::Wrapped(value).into()
-    }
-}
+// impl<R, A, E> From<BoundsError<A>> for TreeContextError<R, WrappedExtra<BoundsError<A>, E>> {
+//     fn from(value: BoundsError<A>) -> Self {
+//         WrappedExtra::Wrapped(value).into()
+//     }
+// }
 
 impl<
         'a,
         Ctx: Context<'a>,
         A: Mentionable<'a, Ctx> + Clone,
         C: 'a + Comparator<A>,
-        E: 'a + Send,
-    > BinaryTreesUnbalanced<'a> for TreeContext2<'a, Ctx, A, C, WrappedExtra<BalancingError, E>>
+        E: 'a + Send + From<BalancingError>,
+    > BinaryTreesUnbalanced<'a> for TreeContext2<'a, Ctx, A, C, E>
 {
     fn tree_of_with_height(&self, node: Self::Node, height: u64) -> BTWrap<'a, Self, Self::Tree> {
         let node = Nullable::from(node);
@@ -250,7 +250,7 @@ impl<
     }
 
     fn balancing_error<T: 'a + Send>(&self, error: BalancingError) -> BTWrap<'a, Self, T> {
-        Self::fail(error.into())
+        Self::fail(TreeContextError::Extra(error.into()))
     }
 
     fn node_heights(&self, node: &Self::Node) -> (u64, u64) {
@@ -263,10 +263,28 @@ impl<
         Ctx: Context<'a>,
         A: Mentionable<'a, Ctx> + Clone,
         C: 'a + Comparator<A>,
-        E: 'a + Send,
-    > BinaryTreesBindable<'a> for TreeContext2<'a, Ctx, A, C, WrappedExtra<BoundsError<A>, E>>
+        E: 'a + Send + From<BoundsError<A>>,
+    > BinaryTreesBindable<'a> for TreeContext2<'a, Ctx, A, C, E>
 {
     fn bounds_error<T: 'a + Send>(&self, error: BoundsError<Self::Key>) -> BTWrap<'a, Self, T> {
-        Self::fail(error.into())
+        Self::fail(TreeContextError::Extra(error.into()))
+    }
+}
+
+#[derive(Debug)]
+pub enum BbError<A> {
+    Balancing(BalancingError),
+    Bounds(BoundsError<A>),
+}
+
+impl<A> From<BalancingError> for BbError<A> {
+    fn from(value: BalancingError) -> Self {
+        Self::Balancing(value)
+    }
+}
+
+impl<A> From<BoundsError<A>> for BbError<A> {
+    fn from(value: BoundsError<A>) -> Self {
+        Self::Bounds(value)
     }
 }