Move-assign a basic_serial_port from another.

basic_serial_port & operator=(
    basic_serial_port && other);
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Move-assign a basic_serial_port from a serial port of another executor type.

template<
    typename Executor1>
constraint< is_convertible< Executor1, Executor >::value, basic_serial_port & >::type operator=(
    basic_serial_port< Executor1 > && other);
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