should print output if go list fails

[lunixbochs]

I have a pretty weird setup and this would've saved me a half hour of debugging.

[haya14busa]

p-r is welcome

[ascandella]

@lunixbochs can you post a set of reproduction steps so that somebody could help fix this issue?

[lunixbochs]

https://github.com/haya14busa/goverage/blob/master/main.go#L159-L162

[ascandella]

That's helpful, but not a full repro case. For example, when you say you have a "pretty weird setup" can you explain your repo layout / GOPATH / etc that would trigger this?

E.g. "I have code located at $x. my GOPATH is $y. I ran $z and got the following output: ..."

[lunixbochs]

No need to talk down to me. Bad RSI. I'll provide a PR tonight if this isn't enough. It can be effectively a single println in the err case. Harder to give you repro.

[ascandella]

Sorry if it came off that way -- I was looking for a set of steps I could use to reproduce the issue so that I could provide a PR and verify that it fixes your issue