# Functions
返回匿名函数的函数
1) x是自由变量
2) 匿名函数和x自由变量共同组成闭包
*/.
*
* 概念说明
* @see
* @param
*/.
*
* 本篇示例参考:https://zhuanlan.zhihu.com/p/351428978
* @see
* @param
*/.
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一个defer引用闭包的示例,等到defer时再来处理.
# Type aliases
返回2个函数类型的返回值.