[issue19018] Heapq.merge suppreses IndexError from user generator

[R. David Murray]

R. David Murray added the comment:

It was checked in as an optimization, but if it fixes a bug I don't see why it couldn't be backported.  A unit test would be helpful, if you feel like writing one.

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nosy: +r.david.murray
versions:  -Python 3.1, Python 3.2

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