Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
There is usually more complex code between PyErr_Fetch() and
_PyErr_ChainExceptions():
PyObject *exc, *val, *tb, *close_result;
PyErr_Fetch(&exc, &val, &tb);
close_result = _PyObject_CallMethodId(result, &PyId_close, NULL);
_PyErr_ChainExceptions(exc, val, tb);
Py_XDECREF(close_result);
Many exceptions can be raised and silenced or overridden between, but we are
interesting in chaining the only latest exception (or restoring the original
exception if all exceptions between were silenced).
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue23188>
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