Why is the return-type for operator++(int) of back_insert_iterator and
front_insert_iterator a copy and of insert_iterator and
ostream_iterator a reference?
I think all three iterators should use the same type.

 24.4.2.2.4   [lib.back.insert.iter.op++]

  back_insert_iterator<Container>  operator++(int);

 24.4.2.4.4   [lib.front.insert.iter.op++]

  front_insert_iterator<Container>  operator++(int);

 24.4.2.6.4   [lib.insert.iter.op++]

  insert_iterator<Container>& operator++(int);

 24.5.2.2     [lib.ostream.iterator.ops]

  ostream_iterator& operatot++(int);
>>>                        ^
>>> Another typo!
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