On Thursday, August 12, 2021 at 12:12:13 AM UTC-4 Ian Lance Taylor wrote:
> On Wed, Aug 11, 2021 at 5:44 PM tapi...@gmail.com <tapi...@gmail.com>
> wrote:
> >
> > But by not specifying the language version in go.mod, I think most
> people would expect to use the latest features.
> > In other words, the default language version gc uses should be the same
> as the version of the toolchain containing gc.
>
> I believe it is. If I run "go mod init" then in the result go.mod
> file I see the current language version.
>
My project was created long before. There is not the "go" directive in
go.mod.
Does it mean I must run "go mod tidy" before run other go commands since Go
1.17?
>
> > BTW, what is the default language version used by gc version go1.17rc2?
>
> 1.17
>
> Ian
>
> > On Wednesday, August 11, 2021 at 4:46:06 PM UTC-4 Ian Lance Taylor
> wrote:
> >>
> >> On Wed, Aug 11, 2021 at 7:45 AM tapi...@gmail.com <tapi...@gmail.com>
> wrote:
> >> >
> >> > // main.go
> >> > package main
> >> >
> >> > func main() {
> >> > var s = []int{1, 2, 3}
> >> > var pa = (*[2]int)(s[1:])
> >> > println(pa[1])
> >> > }
> >> >
> >> > $ go run main.go
> >> > # command-line-arguments
> >> > ./main.go:6:23: cannot convert s[1:] (type []int) to type *[2]int:
> >> > conversion of slices to array pointers only supported as of
> -lang=go1.17
> >> >
> >> > Is it the deliberate design? Shouldn't the lang value be the highest
> language version supported by the current used toolchain?
> >>
> >> This is deliberate design. The idea is that if you put "go 1.16" in
> >> your go.mod file you can reasonably assume that your package will be
> >> usable by people who are still using Go 1.16. If you don't care
> >> whether those people can build your package, go ahead and change to
> >> 1.17.
> >>
> >> Ian
> >
> > --
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>
>
>
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