I'm fairly new to Eagle.
I seem to have introduced a 2-mil, zero-width wire into my board layout.
I can't select it in any way, so I can't get any info. about it, and I
CAN'T DELETE IT.
I thought it might just be an artefact of the rendering process, but
alas it is really there becacause Eagle is leaving a nice gap around it
when I poly-fill the area around it.
I assume as a last resort there is some text-format file I can inspect