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Bug report
Testing out 3.12.0rc1 on NumPy, we came across numpy/numpy#24399. I have distilled this down to a reproducer that fails on 3.12.0rc1, but passes on previous versions.
Checklist
- I am confident this is a bug in CPython, not a bug in a third-party project
- I have searched the CPython issue tracker, and am confident this bug has not been reported before
A clear and concise description of the bug
from ctypes import Structure, pointer, c_int16, cast, POINTER
class Struct(Structure):
_fields_ = [('a', c_int16)]
Struct3 = 3 * Struct
c_array = (2 * Struct3)(
Struct3(Struct(a=1), Struct(a=2), Struct(a=3)),
Struct3(Struct(a=4), Struct(a=5), Struct(a=6))
)
assert c_array[0][0].a == 1
p_obj = cast(pointer(c_array), POINTER(pointer(c_array)._type_))
obj = p_obj.contents
# Works on 3.12, obj is 2d
assert obj[0][0].a == 1
p_obj = cast(pointer(c_array[0]), POINTER(pointer(c_array)._type_))
obj = p_obj.contents
# Fails on 3.12.0rc1, but works on 3.11 and earlier: obj is not 2d
assert obj[0][0].a == 1Your environment
- CPython versions tested on: 3.12rc1
- Operating system and architecture: ubuntu 22.04
Edit: 3.12rc1 -> 3.12.0rc1
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Done