On Tuesday, 17 July 2018 at 13:59:45 UTC, Gary Willoughby wrote:
I thought every range at the lowest level has an `empty` property. So, in this case, it would be:

if (PFResutl.toRange.empty)
{
    writeln("Empty");
}

Yeah, but it seems, that PFResutl is a range of ranges, and the OP has the case, where both of the contained ranges are empty.
However, this does not correspond to empty of the governing range.
So

[[], []].empty is false

whereas

[[], []].joiner.empty is true.

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