why aren't itardators itardabtable? oh cuz java.

Iterators.java

    public static <T> Iterable<T> in(final Iterator<T> iterator) {
        assert iterator != null;
        class SingleUseIterable implements Iterable<T> {
            private boolean used = false;

            @Override
            public Iterator<T> iterator() {
                if (used) {
                    throw new IllegalStateException("SingleUseIterable already invoked");
                }
                used = true;
                return iterator;
            }
        }
        return new SingleUseIterable();
    }

now write

for (x : in(iterator)) {...}