[Python-checkins] gh-106368: Argument Clinic: Test that keyword params are disallowed in groups (#107985)

[erlend-aasland]

https://github.com/python/cpython/commit/57a20b0960f5c087a476b34c72f608580746cab5
commit: 57a20b0960f5c087a476b34c72f608580746cab5
branch: main
author: Erlend E. Aasland <erlend at python.org>
committer: erlend-aasland <erlend.aasland at protonmail.com>
date: 2023-08-16T12:39:56+02:00
summary:

gh-106368: Argument Clinic: Test that keyword params are disallowed in groups (#107985)

files:
M Lib/test/test_clinic.py

diff --git a/Lib/test/test_clinic.py b/Lib/test/test_clinic.py
index 76729c8c3e4f7..32aac407a028c 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