Vagrantfile合并/附加参数

Question

我想允许将参数附加到config.vm.synced_folder。我希望用户将其他参数附加到此配置中。

到目前为止，我有：

append_params = 'x: false, y: false'
config.vm.synced_folder x['folder'], "/var/www", create: true, type: "nfs", append_params 

如果我删除, append_params，它就能正常工作。但使用它时，它会失败，并出现错误：

There is a syntax error in the following Vagrantfile. The syntax error
message is reproduced below for convenience:
D:/x/Vagrantfile:32: syntax error, unexpected '\n', expecting =>

如何根据请求将附加参数附加到config.vm.synced_folder