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Fortunately, there's a special function for that, or at least for enough of that to serve your needs.
Something to look at when all is lost.
Another code golfing adventure.
There's a problem with the stack that prevents it from growing, so you could consider than an overflow.
It is there to detect stack growth, but only if the stack grows into it.
What traditionally goes by the name lock().
It's hard-coded now, sorry.
It's trying to disambiguate name collisions.
Exploring several avenues, hoping one of them leads somewhere.
It's buried somewhere in the specification.