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Update ch7-03.md

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hacknode 2016-11-22 15:21:34 +08:00 committed by GitHub
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@ -41,7 +41,7 @@ var s IntSet
var _ = s.String() // OK: s is a variable and &s has a String method
```
然而，由于只有`*IntSet`类型有String方法，所有也只有`*IntSet`类型实现了fmt.Stringer接口：
然而，由于只有`*IntSet`类型有String方法，所以也只有`*IntSet`类型实现了fmt.Stringer接口：
```go
var _ fmt.Stringer = &s // OK