[issue18408] Fixes crashes found by pyfailmalloc

[STINNER Victor]

STINNER Victor added the comment:

frame_fasttolocals.patch: Add a new PyFrame_FastToLocalsWithError() function, same than PyFrame_FastToLocals(), except that errors are reported.

This function is not atomic: if an error occurs in the middle of map_to_dict(), the frame can enter an inconsistent state. Is it worse than not reporting the failure?

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Added file: http://bugs.python.org/file30933/frame_fasttolocals.patch

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