As of N3242, for an input iterator (i), the type of (*i) must be a reference
([iterator.iterators], Table 106).  However, if (i) is an instance of std::
istreambuf_iterator < char >, the type of (*i) is char, which is not a
reference.  Inconsistent?

(As a practical manifestation, this is the reason why boost:: zip_iterator
does not work with std:: istreambuf_iterator).


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