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Test syntax error on comma-less tuple-style sequence patterns (#115485)

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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.
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da-woods 2024-05-01 09:33:28 +01:00 • committed by GitHub
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commit 21c09d9f81
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Lib/test/test_patma.py
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@ -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 ...: