Move-assign a basic_stream_socket from another.

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

template<
    typename Protocol1,
    typename Executor1>
enable_if< is_convertible< Protocol1, Protocol >::value &&is_convertible< Executor1, Executor >::value, basic_stream_socket & >::type operator=(
    basic_stream_socket< Protocol1, Executor1 > && other);
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