fix typo
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@ -782,7 +782,7 @@ print(interestingNumbers[keyPath: \[String: [Int]].["hexagonal"]!.count.bitWidth
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你可以在平时提供函数或者闭包的上下文里使用 key path 表达式。特别地,你可以用根类型是 `SomeType` 和路径产生 `Value` 类型值的 key path 表达式来替换类型是 `(SomeType) -> Value` 的函数或者闭包。
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```swift
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truct Task {
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struct Task {
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var description: String
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var completed: Bool
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}
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