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[3.12] gh-130775: Allow negative locations in ast (GH-130795) (#132260)

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(cherry picked from commit bc5233b6a5)

Co-authored-by: sobolevn <mail@sobolevn.me>
Co-authored-by: Victor Stinner <vstinner@python.org>
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sobolevn 2025-04-08 13:19:23 +03:00 • committed by GitHub
parent 40f81e1060
commit 492a554cfc
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3 changed files with 20 additions and 4 deletions
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17
Lib/test/test_ast/test_ast.py
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@ -160,6 +160,23 @@ class AST_Tests(unittest.TestCase):
# Check that compilation doesn't crash. Note: this may crash explicitly only on debug mode.
compile(tree, "<string>", "exec")
def test_negative_locations_for_compile(self):
# See https://github.com/python/cpython/issues/130775
alias = ast.alias(name='traceback', lineno=0, col_offset=0)
for attrs in (
{'lineno': -2, 'col_offset': 0},
{'lineno': 0, 'col_offset': -2},
{'lineno': 0, 'col_offset': -2, 'end_col_offset': -2},
{'lineno': -2, 'end_lineno': -2, 'col_offset': 0},
):
with self.subTest(attrs=attrs):
tree = ast.Module(body=[
ast.Import(names=[alias], **attrs)
], type_ignores=[])
# It used to crash on this step:
compile(tree, "<string>", "exec")
def test_slice(self):
slc = ast.parse("x[::]").body[0].value.slice
self.assertIsNone(slc.upper)