Update ch7-03.md

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wahaha 2018-05-27 01:12:05 +08:00 committed by GitHub
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@ -34,7 +34,7 @@ func (*IntSet) String() string
var _ = IntSet{}.String() // compile error: String requires *IntSet receiver
```
但是我们可以在一个IntSet上调用这个方法:
但是我们可以在一个IntSet变量上调用这个方法:
```go
var s IntSet