Here is the explation of const from the go programmer lauguage specification
A constant declaration binds a list of identifiers (the names of the
constants) to the values of a list of constant expressions
<https://golang.org/ref/spec#Constant_expressions>.
在 2017年9月8日星期五 UTC+8下午12:52:44，DrGo写道：
>
> Sorry if this was asked before, but I could not find any relevant posts.
>
> Any reason why this struct literal (made up of fields that can be declared
> const) is not allowed?
>
> const UnknownPos = scanner.Position{"", -1, -1, -1}
>
> error: const initializer scanner.Position literal is not a constant.
>
> Currently, I declare it as a variable, so that I can do things like
> if pos == UnknownPos {
> ...
> }
>
> Cheers,
>
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