test AST base type garbage collection
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 3b9f10c..aa08166 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -1,8 +1,10 @@
import os
import sys
import unittest
-from test import support
import ast
+import weakref
+
+from test import support
def to_tuple(t):
if t is None or isinstance(t, (str, int, complex)):
@@ -207,6 +209,17 @@
# "_ast.AST constructor takes 0 positional arguments"
ast.AST(2)
+ def test_AST_garbage_collection(self):
+ class X:
+ pass
+ a = ast.AST()
+ a.x = X()
+ a.x.a = a
+ ref = weakref.ref(a.x)
+ del a
+ support.gc_collect()
+ self.assertIsNone(ref())
+
def test_snippets(self):
for input, output, kind in ((exec_tests, exec_results, "exec"),
(single_tests, single_results, "single"),