mercurial/commands.py

--- a/mercurial/commands.py	Thu Jul 25 00:00:47 2013 -0500
+++ b/mercurial/commands.py	Thu Jul 25 00:33:28 2013 -0500
@@ -5482,7 +5482,9 @@
     t = ', '.join(t)
     cleanworkdir = False
 
-    if len(parents) > 1:
+    if repo.vfs.exists('updatestate'):
+        t += _(' (interrupted update)')
+    elif len(parents) > 1:
         t += _(' (merge)')
     elif branch != parents[0].branch():
         t += _(' (new branch)')