Test syntax error on comma-less tuple-style sequence patterns (#115485)
Adds a test that length-1 tuple-style sequence patterns must end in a comma, since there isn't currently one.
Spotted while reviewing Cython's proposed implementation of the pattern matching syntax (https://github.com/cython/cython/pull/4897#discussion_r1489177169) where there was a bug my the reimplementation that wasn't caught against the CPython tests here.
diff --git a/Lib/test/test_patma.py b/Lib/test/test_patma.py
index 298e78c..1bdab12 100644
--- a/Lib/test/test_patma.py
+++ b/Lib/test/test_patma.py
@@ -2957,6 +2957,14 @@ def test_invalid_syntax_3(self):
pass
""")
+ def test_len1_tuple_sequence_pattern_comma(self):
+ # correct syntax would be `case(*x,):`
+ self.assert_syntax_error("""
+ match ...:
+ case (*x):
+ pass
+ """)
+
def test_mapping_pattern_keys_may_only_match_literals_and_attribute_lookups(self):
self.assert_syntax_error("""
match ...:
