Sometimes you want to bind a variable to an object enclosed in a match, where you are also specifying match criteria on the nested object.

有时候你希望能够绑定一个变量到匹配中的一个对象，同时又能在嵌套的对象中指定匹配的标准。

youdao

Note in the evaluation, if the pattern is a bound variable, or the element of the pattern is a bound variable, then the result of the pattern match becomes a comparison.

注意，如果模式是绑定的变量，或者模式的元素是绑定的变量，那么模式匹配的结果就会变成比较。

youdao

First off, the variable name doesn't match the source code.

首先，变量名与源代码不一致。

youdao