--- a/tests/test-merge6.t	Thu Jun 15 13:32:32 2017 -0400
+++ b/tests/test-merge6.t	Thu Jun 15 14:22:25 2017 -0400
@@ -1,6 +1,6 @@
   $ cat <<EOF > merge
   > import sys, os
-  > print "merging for", os.path.basename(sys.argv[1])
+  > print("merging for", os.path.basename(sys.argv[1]))
   > EOF
   $ HGMERGE="$PYTHON ../merge"; export HGMERGE