std::istream_iterator<T,CharT,Traits,Distance>::~istream_iterator

~istream_iterator() = default;

1) Destroys the iterator, including the cached value.

If `T` is a literal type, then this destructor is a trivial destructor.	(since C++11) (until C++17)
If `std::is_trivially_destructible_v<T>` is `true`, then this destructor is a trivial destructor.	(since C++17)

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