revert: show warning when reverting subrepos that do not support revert The warning is similar to the warning that was shown before hgsubrepo revert support was added, with the exception that now the subrepo type is shown. For example, when trying to revert a git subrepo located in "include/mygitsub", the warning message would be: include/mygitsub: reverting git subrepos is unsupported

--- a/mercurial/subrepo.py	Wed Apr 18 21:27:35 2012 -0700
+++ b/mercurial/subrepo.py	Thu Apr 19 23:36:42 2012 +0200
@@ -369,6 +369,8 @@
         return []
 
     def revert(self, ui, substate, *pats, **opts):
+        ui.warn('%s: reverting %s subrepos is unsupported\n' \
+            % (substate[0], substate[2]))
         return []
 
 class hgsubrepo(abstractsubrepo):