From b94591090fe84e84869b045e57183b87327ce2c5 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Mon, 7 Oct 2019 06:34:49 -0700
Subject: tree: insert must clear left/right links.

* tree.c (tree_insert_node): A node being inserted might not
have null left and right links; we must clear them.
---
 tree.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tree.c b/tree.c
index 018f52c3..4f81a7a1 100644
--- a/tree.c
+++ b/tree.c
@@ -388,6 +388,9 @@ static val tree_insert_node(val tree, val node)
 
   type_check(self, node, TNOD);
 
+  node->tn.left = nil;
+  node->tn.right = nil;
+
   if (tr->root == nil) {
     tr->size = 1;
     tr->max_size = 1;
-- 
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