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Update 13.1.md (#474)

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GreedyPig
2018-05-19 05:39:31 +08:00
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@@ -15,7 +15,7 @@ type error interface {
任何时候当你需要一个新的错误类型，都可以用 `errors`（必须先 import）包的 `errors.New` 函数接收合适的错误信息来创建，像下面这样：
```go
err := errors.New(“math - square root of negative number”)
err := errors.New("math - square root of negative number")
```
在示例 13.1 中你可以看到一个简单的用例：