check this documentation. https://golang.org/doc/faq#nil_error 

6 Eylül 2018 Perşembe 22:15:17 UTC+3 tarihinde Burak Serdar yazdı:
>
> https://play.golang.org/p/KLXvFNCewyW 
>
> Here, f2() never returns nil, because the returned "nil" valued 
> interface is of type *int. 
>
> It would be really nice if vet could warn if a function returns an 
> interface, and there exist a code path in that function where the 
> return value is set from a reference. 
>
> I've seen a lot of discussions about not returning interfaces, but 
> sometimes you just have to do it. 
>

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