mercurial/extensions.py

--- a/mercurial/extensions.py	Thu Oct 11 06:13:17 2007 +0900
+++ b/mercurial/extensions.py	Tue Sep 18 19:53:01 2007 -0500
@@ -70,6 +70,8 @@
     result = ui.configitems("extensions")
     for i, (name, path) in enumerate(result):
         if path:
+            if path[0] == '!':
+                continue
             path = os.path.expanduser(path)
         try:
             load(ui, name, path)