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gh-151763: Fix debug assertion in unicode subtype cleanup under OOM#152164

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gh-151763: Fix debug assertion in unicode subtype cleanup under OOM #152164

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3 changes: 3 additions & 0 deletions Objects/unicodeobject.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -1720,6 +1720,9 @@ unicode_is_singleton(PyObject *unicode)

PyASCIIObject *ascii = _PyASCIIObject_CAST(unicode);
if (ascii->length == 1) {
if (!PyUnicode_IS_COMPACT(unicode) && _PyUnicode_DATA_ANY(unicode) == NULL) {
return 0;
}
Py_UCS4 ch = PyUnicode_READ_CHAR(unicode, 0);
if (ch < 256 && LATIN1(ch) == unicode) {
return 1;
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