gh-89392: Fix running test_pep646_syntax as script (GH-108875)

diff --git a/Lib/test/test_pep646_syntax.py b/Lib/test/test_pep646_syntax.py
index def313da89acbdeddab530f093ea8c9cc4fa63d0..aac089b190bc11c99ea6fa94d21ee937dbefb973 100644 (file)
--- a/Lib/test/test_pep646_syntax.py
+++ b/Lib/test/test_pep646_syntax.py
@@ -1,4 +1,5 @@
 import doctest
+import unittest
 
 doctests = """