Start implementing overload function

jedi/evaluate/__init__.py

@@ -92,7 +92,7 @@ def _execute(context, arguments):
         debug.warning("no execution possible %s", context)
         return NO_CONTEXTS
     else:
-        context_set = func(arguments)
+        context_set = func(arguments=arguments)
         debug.dbg('execute result: %s in %s', context_set, context)
         return context_set