To be fair, Carmack has advocated for immutability and other good practices at least since the 2000s.

erlang predates that.

I doubt the GP tried to imply the opposite.

maybe, i don't really know.

his comment was in response to the

```

    Rediscovering one of the many great decisions that Erlang made
```

and seemed to me to insinuate just that.

Maybe he read SICP then. But he still didn't write a compiler since