docs: def annotate_op(self, op):
          """
          Takes a bytecode operation (:class:`Op`) and annotates it using the
          data contained in this code object.
  
          Arguments:
              op(Op): An :class:`Op` instance.
  
          Returns:
              AnnotatedOp: An annotated bytecode operation.
          """
  
          if isinstance(op, Label):
              return op
          else:
              return AnnotatedOp(self, op.name, op.arg)