test swift syntax hightlighting
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@ -42,8 +42,10 @@ Swift 是一个类型安全的语言,可选就是一个很好的例子。Swift
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常量和变量必须在使用前声明,用`let`来声明常量,用`var`来声明变量。下面的例子展示了如何用常量和变量来记录用户尝试登录的次数:
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```swift
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let maximumNumberOfLoginAttempts = 10
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var currentLoginAttempt = 0
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```
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这两行代码可以被理解为:
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