'Unpack *args in place if we can.'

def visit_SequenceNode(self, node):

    self.visitchildren(node)
    args = []
    for arg in node.args:
        if (not arg.is_starred):
            args.append(arg)
        elif (arg.target.is_sequence_constructor and (not arg.target.mult_factor)):
            args.extend(arg.target.args)
        else:
            args.append(arg)
    node.args[:] = args
    self._calculate_const(node)
    return node
