$ go get -u golang.org/x/lint/golint
# golang.org/x/tools/go/internal/gcimporter
../../../golang.org/x/tools/go/internal/gcimporter/bexport.go:212: obj.IsAlias undefined (type *types.TypeName has no field or method IsAlias)
The command "go get -u golang.org/x/lint/golint" failed and exited with 2 during .
Travis is failing due to golint as shown below. It appears Go 1.8 is no longer supported (https://github.com/golang/go/issues/28291).