[issue4949] Constness in PyErr_NewException

[Ulrich Eckhardt]

Ulrich Eckhardt <eckhardt at satorlaser.com> added the comment:

It's not just that function, at least not in trunk. There are also 
PyErr_SetFromErrnoWithFilename, PyErr_SetFromErrnoWithUnicodeFilename 
and _PyErr_BadInternalCall which should be made const correct, see 
attached patch for trunk.

This patch also fixes some inconsistencies between the documentation 
and warning support functions.

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keywords: +patch
nosy: +eckhardt
Added file: http://bugs.python.org/file12745/python-2.7-const-error.1.patch

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