Fix imports from collections.abc
diff --git a/Lib/test/support.py b/Lib/test/support.py
index 9300aae..63c5569 100644
--- a/Lib/test/support.py
+++ b/Lib/test/support.py
@@ -15,7 +15,7 @@
import warnings
import unittest
import importlib
-import collections
+import collections.abc
import re
import subprocess
import imp
@@ -682,7 +682,7 @@
sys.modules.update(self.original_modules)
-class EnvironmentVarGuard(collections.MutableMapping):
+class EnvironmentVarGuard(collections.abc.MutableMapping):
"""Class to help protect the environment variable properly. Can be used as
a context manager."""