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gh-155503: Check Py_TPFLAGS_IMMUTABLETYPE in check_immutable_type() #155620

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gh-155503: Check Py_TPFLAGS_IMMUTABLETYPE in check_immutable_type() #155620

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8 changes: 8 additions & 0 deletions Lib/test/support/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3484,3 +3484,11 @@ def check_immutable_type(testcase, type):
regex = r'cannot set .* attribute of immutable type'
with testcase.assertRaisesRegex(TypeError, regex):
setattr(type, 'custom_attr', 123)

try:
from _testlimitedcapi import type_getflags, Py_TPFLAGS_IMMUTABLETYPE
except ImportError:
pass
else:
flags = type_getflags(type)
testcase.assertTrue(flags & Py_TPFLAGS_IMMUTABLETYPE)
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