diff -r 55ff67ffcead -r 7b17f9de6d3e mercurial/scmutil.py
--- a/mercurial/scmutil.py	Sat Jun 03 19:12:01 2017 +0900
+++ b/mercurial/scmutil.py	Sat Aug 20 22:37:58 2016 +0900
@@ -190,6 +190,8 @@
         if inst.hint:
             ui.warn(_("(%s)\n") % inst.hint)
         return 1
+    except error.WdirUnsupported:
+        ui.warn(_("abort: working directory revision cannot be specified\n"))
     except error.Abort as inst:
         ui.warn(_("abort: %s\n") % inst)
         if inst.hint: