The error must be elsewhere in the go infrastructure, possibly in the dh go addon (dh-golang) which generates "go test" for dh_auto_test.
This doesn't seem to be a bug in the package. It just declares "vet" as
a cli.Command in build.go.
- Bug#997563: golang-github-urfave-cli: FTBFS: dh... Lucas Nussbaum
- Bug#997563: Bug #997563: golang-github-urf... Drew Parsons
- Bug#997563: marked as pending in golang-gi... Shengjing Zhu
- Processed: Bug#997563 marked as pending in... Debian Bug Tracking System
- Bug#997563: marked as done (golang-github-... Debian Bug Tracking System