check-code: check for argument passing py2.6ism

contrib/check-code.py

@@ -191,6 +191,7 b' utestfilters = ['
 
 pypats = [
   [
+    (r'\([^)]*\*\w[^()]+\w+=', "can't pass varargs with keyword in Py2.5"),
     (r'^\s*def\s*\w+\s*\(.*,\s*\(',
      "tuple parameter unpacking not available in Python 3+"),
     (r'lambda\s*\(.*,.*\)',

mercurial/dispatch.py

@@ -103,8 +103,8 b' def _runcatch(req):'
             if req.repo:
                 # copy configs that were passed on the cmdline (--config) to
                 # the repo ui
-                for cfg in cfgs:
-                    req.repo.ui.setconfig(*cfg, source='--config')
+                for sec, name, val in cfgs:
+                    req.repo.ui.setconfig(sec, name, val, source='--config')
 
             # if we are in HGPLAIN mode, then disable custom debugging
             debugger = ui.config("ui", "debugger")