diff --git a/src/flow/binary/bound.rs b/src/flow/binary/bound.rs
index 5c67957..829b691 100644
--- a/src/flow/binary/bound.rs
+++ b/src/flow/binary/bound.rs
@@ -17,6 +17,12 @@ impl<A, T> std::ops::Deref for Bound<A, T> {
     }
 }
 
+impl<A, T> AsRef<T> for Bound<A, T> {
+    fn as_ref(&self) -> &T {
+        &self.bound
+    }
+}
+
 pub struct BoundNode<A, T> {
     boundsl: Bounds<A>,
     boundsr: Bounds<A>,