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Apparently this patch is stalled, but I'd like to get it in,
in some form, for 2.4.  The only question, as far as I know,
is whether empty matches following non-empty matches "count"
or not (they do in the original patch).

If I make a patch with the "doesn't count" behavior, could
we apply that right away?  I'd rather get either behavior in
for 2.4 than wait for 2.5...