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[3.13] gh-132435: Test syntax warnings in a finally block (GH-132436) #132503

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Merged
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Apr 14, 2025
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[3.13] gh-132435: Test syntax warnings in a finally block (GH-132436) #132503

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20 changes: 20 additions & 0 deletions Lib/test/test_compile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1530,6 +1530,26 @@ def test_compile_warnings(self):

self.assertEqual(len(caught), 2)

def test_compile_warning_in_finally(self):
# Ensure that warnings inside finally blocks are
# only emitted once despite the block being
# compiled twice (for normal execution and for
# exception handling).
source = textwrap.dedent("""
try:
pass
finally:
1 is 1
""")

with warnings.catch_warnings(record=True) as caught:
warnings.simplefilter("default")
compile(source, '<stdin>', 'exec')

self.assertEqual(len(caught), 1)
self.assertEqual(caught[0].category, SyntaxWarning)
self.assertIn("\"is\" with 'int' literal", str(caught[0].message))

@requires_debug_ranges()
class TestSourcePositions(unittest.TestCase):
# Ensure that compiled code snippets have correct line and column numbers
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2025-04-13-10-34-27.gh-issue-131927.otp80n.rst
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@@ -0,0 +1,3 @@
Compiler warnings originating from the same module and line number are now
only emitted once, matching the behaviour of warnings emitted from user
code. This can also be configured with :mod:`warnings` filters.
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