Go无法推断出分配的类型:“:=左侧的非名称"

问题描述

此代码段按预期方式运行 play.golang.org/p/VuCl-OKMav

This snippet works as expected play.golang.org/p/VuCl-OKMav

i := 10
next := 11
prev, i := i, next

但这几乎相同的代码片段给出了non-name f.Bar on left side of := play.golang.org/p/J8NNWPugQG

However this nearly identical snippet gives non-name f.Bar on left side of := play.golang.org/p/J8NNWPugQG

type Foo struct {
    Bar int
}

f := Foo{10}
next := 11
prev, f.Bar := f.Bar, next

关于停止类型推断的结构有何特别之处?这是一个错误吗?

What's special about the struct that stops type inference? Is this a bug?

推荐答案

这是一个未解决的问题.

It's an open issue.

问题6842 :规范:分配给具有短声明符号的字段

Issue 6842: spec: Assigning to fields with short declaration notation

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