UnboundLocalError: local variable 'impl' referenced before assignment

[anonymous]

(FYI, environment: Debian 4.0, sid; trac 0.11dev r6083)

I received the following error when I followed the "Plugins" link immediately after install:

Traceback (most recent call last):
  File "/var/lib/python-support/python2.5/trac/web/main.py", line 381, in dispatch_request
    dispatcher.dispatch(req)
  File "/var/lib/python-support/python2.5/trac/web/main.py", line 191, in dispatch
    resp = chosen_handler.process_request(req)
  File "/var/lib/python-support/python2.5/trac/admin/web_ui.py", line 108, in process_request
    path_info)
  File "/var/lib/python-support/python2.5/tracdeveloper/plugins.py", line 22, in render_admin_panel
    data = self.get_api(req)
  File "/var/lib/python-support/python2.5/tracdeveloper/plugins.py", line 71, in get_api
    interface_methods = [m['name'] for i in impl for m in i['methods']]
UnboundLocalError: local variable 'impl' referenced before assignment

I'm not sure if this is a fix or a workaround, as I just barely looked at the code. In any case, the below patch fixes the problem without causing any apparent problems (yet).

--- plugins.py.orig     2007-11-03 00:19:53.335412857 -0400
+++ plugins.py  2007-11-03 00:10:11.300490812 -0400
@@ -68,14 +68,15 @@
             if hasattr(component, '_implements'):
                 impl = [interfaces['%s.%s' % (i.__module__, i.__name__)]
                         for i in component._implements]
-            interface_methods = [m['name'] for i in impl for m in i['methods']]
+                interface_methods = [m['name'] for i in impl for m in i['methods']]
+                data['implements'] = impl
+                for imp in impl:
+                    imp['implemented_by'].append(data)
+
             methods = self.extract_methods(req, component, interface_methods)
             data = self.base_data(req, component)
             data['extensionpoints'] = self.extension_points(req, component)
-            data['implements'] = impl
             data['methods'] = methods
-            for imp in impl:
-                imp['implemented_by'].append(data)
             components[data['name']] = data
         api['components'] = components
         return api

[Alec Thomas]

Fixed in r2737, thanks.