# HG changeset patch
# User Brodie Rao <brodie@bitheap.org>
# Date 2010-08-28 00:45:18
# Node ID cd895084a4cd80abd241060705090aa7c3d9f39a
# Parent  4982fa38e544520e76f7f6bc974f6c60959eb66d

alias: on --debug, print expansion when it has invalid arguments

diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
--- a/mercurial/dispatch.py
+++ b/mercurial/dispatch.py
@@ -293,7 +293,12 @@ class cmdalias(object):
         if self.definition.startswith('!'):
             return self.fn(ui, *args, **opts)
         else:
-            return util.checksignature(self.fn)(ui, *args, **opts)
+            try:
+                util.checksignature(self.fn)(ui, *args, **opts)
+            except error.SignatureError:
+                args = ' '.join([self.cmdname] + self.args)
+                ui.debug("alias '%s' expands to '%s'\n" % (self.name, args))
+                raise
 
 def addaliases(ui, cmdtable):
     # aliases are processed after extensions have been loaded, so they