seg fault with List.tabulate in 3.9.1

[Henry Cejtin]

I'm curious if the problem with
	val _ = List.tabulate (1000000, fn i => i)
segfaulting might not `just' be that they run out of stack space.  I.e., if
they wrote this function non-tail-recursively (as opposed to 2 passes, with
one reversing the list) then it is 10^6 non-tail calls.
Not that this is much of an excuse.