Not sure what’s going on in the first snippet, but the warning(s) in the latter are expected.
Could you post your architecture/OS info?
macOS 10.14.6 (18G95) - go version go1.13 darwin/amd64
Hmm, I haven't tried go 1.13 yet. Might try it soon, as I have my Mac with me here in CO; or when I'm back Friday. I'm guessing it's the new version of Go, as 1.12 works fine for me.