> Imagine that you have a metal clip that clips to the edge of a PCB. Since
> it's metal, it connects both pads (top and bottom), so there is no need to
> connect the two pads on the PCB: they are guaranteed to be one signal when
> the clip is installed.

I guess this is a battery clip or similar.

I know that in Allegro, the way around this is to make the second pin a 
mechanical pad. Is that option available in Eagle? 

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