* to a bug that I wrote four years ago

Yes! With a few plugins, of course. YouCompleteMe and fzf.vim are my favorites by far. I spend a lot of time on embedded Linux devices at work, so it’s pretty convenient to use the same editor on my laptop and on the target device.

My burn-the-house-down take on this: very slowly flip each switch on and listen for arcing. Works fine assuming the other two switches aren’t connected to anything.