remove more used_vars

jedi/evaluate_representation.py

@@ -82,7 +82,7 @@ class Instance(use_metaclass(cache.CachedMetaClass, Executable)):
         normally self.
         """
         try:
-            return str(func.params[0].used_vars[0])
+            return str(func.params[0].get_name())
         except IndexError:
             return None
 

jedi/parsing.py

@@ -215,7 +215,7 @@ class Parser(object):
                     param.add_annotation(annotation)
 
             # params without vars are usually syntax errors.
-            if param and (param.get_set_vars() or param.used_vars):
+            if param and (param.get_set_vars()):
                 param.position_nr = pos
                 names.append(param)
                 pos += 1