#### basic_serial_port::operator=

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_t< is_convertible< Executor1, Executor >::value, basic_serial_port & > operator=(
        basic_serial_port< Executor1 > && other);
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