[issue2542] PyErr_ExceptionMatches must not fail

[Thomas Heller]

New submission from Thomas Heller <theller at ctypes.org>:

PyErr_ExceptionMatches must not fail, according to the docs.  So an
error code from PyObject_IsSubclass() cannot be returned.

The attached patch calls PyErr_WriteUnraisable in this case, and returns
an arbitrary value (0 was chosen in the patch).

See also issue #2534.

----------
components: Interpreter Core
files: errors.diff
keywords: patch, patch
messages: 64894
nosy: theller
severity: normal
status: open
title: PyErr_ExceptionMatches must not fail
type: crash
versions: Python 2.6
Added file: http://bugs.python.org/file9931/errors.diff

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