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Re:Go 1.12 Release Candidate 1 is released by puddums on Tuesday February 12, 2019 @08:48AM (#19143371)
The module cache in Go 1.11 can sometimes cause various errors, primarily if there were previously network issues or multiple go commands executing in parallel, where the workaround would then be to delete GOPATH/pkg (or run 'go clean -modcache'). I would guess your coworkers were seeing some variation of that.

If so, that is addressed for Go 1.12:

https://github.com/golang/go/issues/26794

Re:Go 1.12 Release Candidate 1 is released by canadev on Tuesday February 12, 2019 @08:50AM (#19143381)
We definitely weren't deliberately executing commands in parallel and I think it's pretty rare that we have network issues.
Re:Go 1.12 Release Candidate 1 is released by LukeShu on Tuesday February 12, 2019 @09:58AM (#19143936)
I've had 2 coworkers who use different IDEs report that apparently their IDE is running `go` commands in parallel, because they'll get the corrupted module caches.