Hmm, seems C99 allows this. I didn't know that - my bad.
Personally, I avoid variable length arrays out of fear that the
allocation might fail. On 10.3 or 10.4 I ran into a situation where
writing to memory from alloca was smashing the stack; unfortunately it
didn't return NULL when it wasn't able to allocate sufficient memory.
My impression was that the mechanism is similar for these, but I could
be totally wrong...
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