Can we "go get" unreleased standard library packages?

[Matt Mueller]

Hey there, I'd like to try the io/fs package on Go 1.15. Is there an easy way to do this?

I tried without much expectation:

go get -u github.com/golang/go/src/io/fs

But was greeted with this error:

go: found github.com/golang/go/src/io/fs in github.com/golang/go/src v0.0.0-20201202201757-2d0258d49568

go get: github.com/golang/go/s...@v0.0.0-20201202201757-2d0258d49568: parsing go.mod:

        module declares its path as: std

                but was required as: github.com/golang/go/src

Any ideas? Thanks!

[Axel Wagner]

No, that's not really possible. The stdlib is packaged with the Go compiler and is very interdependent.

It also wouldn't help you a lot, because in go1.15, the `io/fs` package has no implementation yet. For example, (*os.File).Stat does not return the correct type, compare

https://tip.golang.org/pkg/os/#FileInfo

with

https://golang.org/pkg/os/#FileInfo

If you want to experiment, you have to use a go version compiled from tip. You can already develop against it, if you use build tags to guard on go1.16 (though keep in mind that the interfaces could, theoretically, still change).

Otherwise you just have to wait for go1.16. A beta should be released soon (probably next week, AIUI).

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[Matt Mueller]

Ah, that's a great point. Thanks for taking the time to explain it!

I'll wait for the beta then – thanks!

[Kostarev Ilya]

$ git checkout master

in source tree provide me `io/fs`

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[Kevin Chowski]

To follow up on Axel's suggestion to use "tip", this tool will automatically download the latest repository and compile it for you, with just two simple commands (download/compile the tool with go get, then run the tool): https://godoc.org/golang.org/dl/gotip

I used it the other week and I was quite impressed with how smooth it was!