Move-assign a basic_raw_socket from another.

basic_raw_socket & operator=(
    basic_raw_socket && other);
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Move-assign a basic_raw_socket from a socket of another protocol type.

template<
    typename Protocol1>
enable_if< is_convertible< Protocol1, Protocol >::value, basic_raw_socket >::type & operator=(
    basic_raw_socket< Protocol1 > && other);
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