well I have. My trusty '73 P bass pickup went open circuit during the first set. I was miles from home and didn't have a backup.
There was a very faint sound, so I turned everything flat out and put it thru the PA. It sounded pretty awful but got me thru the gig.
Now i always carry 2 basses (unless I am using my Jazz bass, where I hope, both pickups wont die at the same time)
With the Police tribute, I carry 2 basses with the matching outfits that Sting would have worn.