From c55ae1dc3094912c935fb95cf915841af0259305 Mon Sep 17 00:00:00 2001
From: Tamir Duberstein <tamird@gmail.com>
Date: Tue, 24 Mar 2015 17:02:18 -0700
Subject: [PATCH] Fill in missing implementation

---
 src/libcollections/btree/node.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libcollections/btree/node.rs b/src/libcollections/btree/node.rs
index 581cfa3f09bf4..a480335c94693 100644
--- a/src/libcollections/btree/node.rs
+++ b/src/libcollections/btree/node.rs
@@ -585,6 +585,9 @@ impl <K, V> Node<K, V> {
         self._len
     }
 
+    /// Does the node not contain any key-value pairs
+    pub fn is_empty(&self) -> bool { self.len() == 0 }
+
     /// How many key-value pairs the node can fit
     pub fn capacity(&self) -> usize {
         self._capacity