diff --git a/jedi/evaluate/param.py b/jedi/evaluate/param.py
index 14cb0bad..3a0424f1 100644
--- a/jedi/evaluate/param.py
+++ b/jedi/evaluate/param.py
@@ -322,7 +322,7 @@ def _gen_param_name_copy(func, var_args, param, keys=(), values=(), array_type=N
 
     # create an Array (-> needed for *args/**kwargs tuples/dicts)
     arr = pr.Array(helpers.FakeSubModule, start_pos, array_type, parent)
-    arr.values = values
+    arr.values = list(values)  # Arrays only work with list.
     key_stmts = []
     for key in keys:
         key_stmts.append(helpers.FakeStatement([key], start_pos))
diff --git a/jedi/evaluate/representation.py b/jedi/evaluate/representation.py
index b2609681..4589ea20 100644
--- a/jedi/evaluate/representation.py
+++ b/jedi/evaluate/representation.py
@@ -233,13 +233,18 @@ class InstanceElement(use_metaclass(CachedMetaClass, pr.Base)):
 
     def expression_list(self):
         # Copy and modify the array.
-        return [InstanceElement(self.instance._evaluator, self.instance, command, self.is_class_var)
+        return [InstanceElement(self._evaluator, self.instance, command, self.is_class_var)
                 if not isinstance(command, (pr.Operator, Token)) else command
                 for command in self.var.expression_list()]
 
     def __iter__(self):
         for el in self.var.__iter__():
-            yield InstanceElement(self.instance._evaluator, self.instance, el, self.is_class_var)
+            yield InstanceElement(self.instance._evaluator, self.instance, el,
+                                  self.is_class_var)
+
+    def __getitem__(self, index):
+        return InstanceElement(self._evaluator, self.instance, self.var[index],
+                               self.is_class_var)
 
     def __getattr__(self, name):
         return getattr(self.var, name)