#3117: backport r55087, fixes segfault with lambda (None,): None.
diff --git a/Lib/test/test_grammar.py b/Lib/test/test_grammar.py
index 6a9e512..09ccde7 100644
--- a/Lib/test/test_grammar.py
+++ b/Lib/test/test_grammar.py
@@ -277,6 +277,7 @@
 verify(l5(1, 2) == 5)
 verify(l5(1, 2, 3) == 6)
 check_syntax("lambda x: x = 2")
+check_syntax("lambda (None,): None")
 
 ### stmt: simple_stmt | compound_stmt
 # Tested below