(Changed in version 2.8.0) collect has changed. The previous behavior can be reproduced with toSeq.
Determines whether the iterator is empty.
Determines whether the iterator is empty. A MultiIterator
is empty when all contained iterators have been exhausted.
true if there's more to read, false if not
Get the next element.
An iterator that iterates, serially, over the contents of multiple other iterators.