fall back when an old test_support doesn't have various data and functions (closes #17533)
diff --git a/Lib/test/pickletester.py b/Lib/test/pickletester.py
index 3e7e11d..c95531f 100644
--- a/Lib/test/pickletester.py
+++ b/Lib/test/pickletester.py
@@ -6,8 +6,14 @@
import pickletools
import copy_reg
-from test.test_support import (TestFailed, have_unicode, TESTFN, _2G, _1M,
- precisionbigmemtest)
+from test.test_support import TestFailed, verbose, have_unicode, TESTFN
+try:
+ from test.test_support import _2G, _1M, precisionbigmemtest
+except ImportError:
+ # this import might fail when run on older Python versions by test_xpickle
+ _2G = _1G = 0
+ def precisionbigmemtest(*args, **kwargs):
+ return lambda self: None
# Tests that try a number of pickle protocols should have a
# for proto in protocols: