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gh-104635: Add a test case for variables that have a dependency. #106583

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Merged
corona10 merged 3 commits into from
Jul 11, 2023
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gh-104635: Add a test case for variables that have a dependency. #106583

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gh-104635: Add a test case for variables that have a dependency.
corona10 Jul 10, 2023
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corona10 Jul 10, 2023
c0f0393
Update Lib/test/test_compile.py
corona10 Jul 10, 2023
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9 changes: 9 additions & 0 deletions Lib/test/test_compile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1186,6 +1186,15 @@ def f(x, y, z):
return a
self.assertEqual(f("x", "y", "z"), "y")

def test_variable_dependent(self):

@vstinner vstinner Jul 10, 2023

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Can you please explain the purpose of the test in a comment? From the code, it's nonibvious to me how it can be miscompiled.

@corona10 corona10 Jul 10, 2023

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Can you please explain the purpose of the test in a comment? From the code, it's nonibvious to me how it can be miscompiled.

No, it doesn't miscompile at this optimization moment.
But I was quite surprised with the CI never failed with the wrong compile for the #106571 (comment).
So it could be good to be added. I thought that miscompile case should be caught at the CI level.

@vstinner vstinner Jul 10, 2023

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I don't say that the code is miscompiled. I propose adding a comment to explain that the test checks that this specific code is not miscompiled, but please explain why it could be miscompiled.

@corona10 corona10 Jul 10, 2023

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Done!

# gh-104635: Since the value of b is dependent on the value of a
# the first STORE_FAST for a should not be skipped. (e.g POP_TOP).
# This test case is added to prevent potential regression from aggressive optimization.
def f():
a = 42; b = a + 54; a = 54
return a, b
self.assertEqual(f(), (54, 96))


@requires_debug_ranges()
class TestSourcePositions(unittest.TestCase):
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