--- a/tests/test-options.t	Tue Jan 22 10:44:49 2019 -0500
+++ b/tests/test-options.t	Tue Jan 22 10:45:09 2019 -0500
@@ -24,7 +24,6 @@
   >   allowunstable
   >   exchange
   > EOF
-  $ hg prune
+  $ hg prune | head -n 2
   hg: unknown command 'prune'
   (use 'hg help' for a list of commands)
-  [255]