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experimental::wait_for_one_error::operator() (3 of 3 overloads)
    typename E,
    typename... Args>
constexpr constraint< is_same< typename decay< E >::type, boost::system::error_code >::value||is_same< typename decay< E >::type, std::exception_ptr >::value, cancellation_type_t >::type operator()(
    const E & e,
    Args && ...) const;