typo: errow => error
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@ -703,7 +703,7 @@ if let definiteString = assumedString {
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当一个函数遇到错误条件,它能报错。调用函数的地方能抛出错误消息并合理处理。
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```swift
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func canThrowAnErrow() throws {
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func canThrowAnError() throws {
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// 这个函数有可能抛出错误
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}
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```
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@ -712,7 +712,7 @@ func canThrowAnErrow() throws {
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```swift
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do {
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try canThrowAnErrow()
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try canThrowAnError()
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// 没有错误消息抛出
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} catch {
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// 有一个错误消息抛出
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