"children binarySearchTree [1]" should return "[]" instead of "[[]]".
diff --git a/src/algebra/aggcat.spad b/src/algebra/aggcat.spad
index f960af07..b0edbde7 100644
--- a/src/algebra/aggcat.spad
+++ b/src/algebra/aggcat.spad
@@ -1168,9 +1168,10 @@ BinaryRecursiveAggregate(S : Type) : Category ==
RecursiveAggregate S with
concat(nodes left x, concat(x, nodes right x))
children x ==
- l := empty()$List(%)
- empty? x => l
- empty? left x => [right x]
+ empty? x => empty()
+ empty? left x =>
+ empty? right x => empty()
+ [right x]
empty? right x => [left x]
[left x, right x]
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