Step backwards

[Zomis]

If at all possible in BF, it would be useful to "step backwards" while debugging so that you can easier find where things go wrong when they go wrong

[Zomis]

For this you'd need to know a couple of things:

• , what was the value of the cell before the operation?
• if there is a [ or ] before the command, how many times has the loop been performed? Was it ever performed? Should we go backwards to before [ or before ] ?

The other commands are pretty clear how they should be reversed.