Add go 1.8

[chulkilee]

After making all changes to the cask:

• brew cask audit --download {{cask_file}} is error-free.
• brew cask style --fix {{cask_file}} reports no offenses.
• The commit message includes the cask’s name and version.

Additionally, if adding a new cask:

• Named the cask according to the token reference.
• brew cask install {{cask_file}} worked successfully.
• brew cask uninstall {{cask_file}} worked successfully.
• Checked there are no open pull requests for the same cask.
• Checked the cask was not already refused in closed issues.
• Checked the cask is submitted to the correct repo.

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Note that brew cask uninstall go does not remove /usr/local/go. Should it remove that directory?

[vitorgalvao]

Thank you, but this is a language, so it belongs in Homebrew.

Additionally, pkg casks require an uninstall to be accepted.

[chulkilee]

I know brew has it (https://github.com/Homebrew/homebrew-core/blob/master/Formula/go.rb) but it compiles (or uses bottle for custom build, I guess), not using the official package installer. I believe they have their own merits - so why can't we have go in both brew and brew cask?

Note that go from brew cask can "coexist" with go from brew, since it installs binaries on /usr/local/go/bin while brew version installs binaries to /usr/local/bin

Added uninstall stanza - now uninstall works.

[vitorgalvao]

so why can't we have go in both brew and brew cask?

#15603

Because it took a lot of people time to reduce duplicated efforts between the projects, and we don’t want to undo that.

[chulkilee]

Thanks for the link! I ended up with https://github.com/chulkilee/homebrew-alt