[issue18560] builtin_sum() doesn't check return value of PyLong_FromLong()

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> added the comment:

Backported to 2.7 in 67dafd5c202cd529e209bf3f35e022ce766709eb. (I messed up the commit message.)

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nosy: +benjamin.peterson
versions: +Python 2.7

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<https://bugs.python.org/issue18560>
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