--- a/hgext3rd/evolve/obshashtree.py	Wed Jul 03 11:13:47 2019 -0700
+++ b/hgext3rd/evolve/obshashtree.py	Tue Jul 09 10:56:42 2019 -0700
@@ -28,9 +28,9 @@
 # the obshash of its parents.  This is similar to what happend for changeset
 # node where the parent is used in the computation
 @eh.command(
-    'debugobsrelsethashtree',
-    [('', 'v0', None, 'hash on marker format "0"'),
-     ('', 'v1', None, 'hash on marker format "1" (default)')], _(''))
+    b'debugobsrelsethashtree',
+    [(b'', b'v0', None, b'hash on marker format "0"'),
+     (b'', b'v1', None, b'hash on marker format "1" (default)')], _(b''))
 def debugobsrelsethashtree(ui, repo, v0=False, v1=False):
     """display Obsolete markers, Relevant Set, Hash Tree
     changeset-node obsrelsethashtree-node