# ladders: any entry with from == to (a same-tag re-test), or two entries with the same `to` (a re-test at a new digest)?
from == to entries: none
same `to` twice: none
ladder.check_entry(from == to): no problem found
step_file(to) for the old head and a same-tag re-test are the SAME path: steps/09d1fdf5e748a56c.yml
