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The Smalltalks are nearly unmatched on this. Pharo is a great representative of this tradition.

"One aspect which has not yet been focused upon is that in modern Smalltalks (forget about the block-fiddling in ST-80) exceptions are proceedable. This means, that the exception handler may decide to repair some malfunction and continue execution after the point where the original exception was raised."

https://wiki.c2.com/?SmalltalkAndExceptions

So it falls short of full fledged past time travel. It's more like you could stop the flow of time, fix whatever went wrong, and then restore time flow, as if nothing had happened. Short of what OP wanted, but still very useful. It avoids "Groundhog Day" debugging.

> Short of what OP wanted…

(That wasn't what I wanted to post; I should have waited.)

More like stop the flow of time, fix whatever went wrong, fix why it went wrong, go back before it happened, and then restore time flow, as if nothing had happened (so more restart before than resume after).

I don't know if that's what the OP wanted or not, I'll leave you to explain.

https://news.ycombinator.com/item?id=28361693

https://news.ycombinator.com/item?id=28361845

Sorry, I got confused.

About what the OP meant or about what I meant? :-)

Probably both.

This is also possible in common lisp.

Reply on news.ycombinator.com