// checking for std::unexpected()

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// will fail if namespaces aren't supported
namespace std {

// looking for a definition in compiler support library
void unexpected ();

}

// will cause an error if namespace std isn't being honored
int unexpected ();

int main (int argc, char *argv[])
{
    (void)&argv;

    if (argc > 1)
        std::unexpected ();

    return 0;
}