--- a/hgext3rd/topic/destination.py	Mon Apr 25 21:24:20 2016 -0700
+++ b/hgext3rd/topic/destination.py	Wed May 11 16:22:52 2016 +0200
@@ -11,6 +11,7 @@
 
 def _destmergebranch(orig, repo, action='merge', sourceset=None,
                      onheadcheck=True, destspace=None):
+    # XXX: take destspace into account
     p1 = repo['.']
     top = p1.topic()
     if top: