code: def MEASURE(qubit, classical_reg):
      
      qubit = unpack_qubit(qubit)
      if classical_reg is None:
          address = None
      elif isinstance(classical_reg, int):
          warn("Indexing measurement addresses by integers is deprecated. "
               + "Replacing this with the MemoryReference ro[i] instead.")
          address = MemoryReference("ro", classical_reg)
      else:
          address = unpack_classical_reg(classical_reg)
      return Measurement(qubit, address)
docs: Produce a MEASURE instruction.
  
      :param qubit: The qubit to measure.
      :param classical_reg: The classical register to measure into, or None.
      :return: A Measurement instance.