How to use Go 1.16 beta?

[marten-seemann]

I have a Go 1.16 project that I'd like to test, but as far as I can see, the beta is neither available on go-versions nor on go dist.

This would be really helpful for the Go ecosystem, as beta (and RC) versions need to be actually used if we are supposed to actually find and report bugs before the official release.

[marten-seemann]

Figured it out:

uses: actions/setup-go@v2
    with:
          stable: false
          go-version: '1.16.0-beta1'

It actually is available on go dist, the directory listing just doesn't doesn't show all available versions (looks like the XML is truncated at some point).

[marten-seemann]

Tip: Here's how you could use this in a matrix build.

strategy:
    matrix:
        go: [ "1.15", "1.16.0-beta1" ]
    steps:
        - uses: actions/setup-go@v2
            with:
                stable: '!contains(${{ matrix.go }}, "beta") && !contains(${{ matrix.go }}, "rc")'
                go-version: ${{ matrix.go }}

EDIT: The logic for stable was the wrong way around. Fixed that.