7.03 says two runners can not occupy a base, but there is no penalty listed. The penalty, of course, is when the defense tags the one who does not belong there. There is no advantage to the defense to leave 2 runners on a base on purpose, so it is not the same as the protection provided by the infield fly rule. For example, if the defense left a runner on each base, they could be subject to a 7 run homer, or a 6 run base hit. This is not an advantage. The defense is out there to retire the side, without runs being scored if possible.
While leaving 2 runners on base is possible, I have never seen it, and as I mentioned earlier, I would stand there looking at both of them until the defense made a play. They will figure it out. There is no reason for calling one of them out until the defense makes the play.
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