From 46b67c05396081720f5ef19d566d5c3630239eea Mon Sep 17 00:00:00 2001
From: guo-yong-zhi <55872791+guo-yong-zhi@users.noreply.github.com>
Date: Tue, 28 Dec 2021 21:16:15 +0800
Subject: [PATCH] fix UpdatedSet union!

---
 src/qtree_functions.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/qtree_functions.jl b/src/qtree_functions.jl
index fe2092b..8fd6a89 100644
--- a/src/qtree_functions.jl
+++ b/src/qtree_functions.jl
@@ -297,7 +297,7 @@ UpdatedSet(maxlen::Int) = UpdatedSet(maxlen, maxlen, Set{Int}(1:maxlen))
 UpdatedSet(labels, maxlen::Int=length(labels)) = UpdatedSet(length(labels), maxlen, Set{Int}(labels))
 function Base.union!(s::UpdatedSet, c)
     s.updatelen = length(c)
-    length(s.set) == s.maxlen || union!(s.set, c)
+    length(s.set) == s.maxlen ? s : union!(s.set, c)
 end
 Base.empty!(s::UpdatedSet) = empty!(s.set)
 Base.length(s::UpdatedSet) = length(s.set)