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djcb comments on Conversation Halters - Less Wrong
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well, going slightly off-topic here; it's not strictly forbidden to write past the end of the array, it's just that the result is undefined. Depending what's on the stack, it might actually work in some cases. Needless to say, one should never do this.
He was probably confusing it with the idea that it is legitimate have a pointer that is one past the end of an array for the purpose of comparing pointers. You still can't dereference it reliably, however.
Er, s/run/run properly/.