gc can not infer the type of {1, 2} of {1,2,3,4}, so you need to indicate
it's type
在 2019年3月19日星期二 UTC+8上午10:47:43，dja...@gmail.com写道：
>
> Hi,
> https://play.golang.org/p/hRHEuGG6zAf
> why composite literal in line 16 does not work ?
> thanks in advance.
>
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