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struct - Missing type in composite literal

type A struct {
    B struct {
        Some string
        Len  int
    }
}

Simple question. How to initialize this struct? I would like to do something like this:

a := &A{B:{Some: "xxx", Len: 3}} 

Expectedly I'm getting an error:

missing type in composite literal

Sure, I can create a separated struct B and initialize it this way:

type Btype struct {
    Some string
    Len int
}

type A struct {
    B Btype
}

a := &A{B:Btype{Some: "xxx", Len: 3}}

But it not so useful than the first way. Is there a shortcut to initialize anonymous structure?

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