Create a lazy list from a callback. Next is called repeatedly to
extend the list. It is called as call(Next, List, Tail), where
the difference listList\Tail produces the next slice of the
list. If the end of the input is reached, List must be a
proper list and Tail must be .
- The content returned by the iterator is duplicated in
nb_setarg/3. This is needed by avoid the risk of trailed
assignments in the structure. Avoiding this duplication would
significantly reduce the overhead.
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