https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71431

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Could you clarify exactly what you think is a bug then?

This example shows that failbit is set on the output stream, as required:

#include <fstream>
#include <iostream>
#include <sstream>
int main()
{
    std::ifstream f(".");
    std::ostringstream ss;
    ss << f.rdbuf();
    std::cout << (bool)f.fail() << '\n';
    std::cout << (bool)ss << '\n';
}

The standard doesn't say anything about operator<<(basic_streambuf<C,T>*)
setting any error bits on the input streambuf if reading characters from it
fails.

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