diff --git a/Lib/test/test_clinic.py b/Lib/test/test_clinic.py
index 76729c8c3e4f79..32aac407a028c9 100644
--- a/Lib/test/test_clinic.py
+++ b/Lib/test/test_clinic.py
@@ -1524,6 +1524,27 @@ def test_disallowed_grouping__no_matching_bracket(self):
err = "Function 'empty_group' has a ']' without a matching '['"
self.expect_failure(block, err)
+ def test_disallowed_grouping__must_be_position_only(self):
+ dataset = ("""
+ with_kwds
+ [
+ *
+ a: object
+ ]
+ """, """
+ with_kwds
+ [
+ a: object
+ ]
+ """)
+ err = (
+ "You cannot use optional groups ('[' and ']') unless all "
+ "parameters are positional-only ('/')"
+ )
+ for block in dataset:
+ with self.subTest(block=block):
+ self.expect_failure(block, err)
+
def test_no_parameters(self):
function = self.parse_function("""
module foo
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