checkerror

pkglist, err := pkgutil.FindAllSubPackages("errortest", "")
if err != nil {
	fmt.Println(err)
}
errs := Check(pkglist, false)
for _, err := range errs {
	fmt.Println(err)
}

Output:

error factory "github.com/tsaikd/gobuilder/checkerror/vendor/errortest/provide" "ErrorProvideTest" declared but not used
error factory "github.com/tsaikd/gobuilder/checkerror/vendor/errortest/provide2" "ErrorProvide2Test" declared but not used

pkglist, err := pkgutil.FindAllSubPackages("github.com/tsaikd/gobuilder", "..")
if err != nil {
	fmt.Println(err)
}
errs := Check(pkglist, false)
for _, err := range errs {
	fmt.Println(err)
}

pkglist, err := pkgutil.FindAllSubPackages("pkgtest", "")
if err != nil {
	fmt.Println(err)
}
errs := Check(pkglist, false)
for _, err := range errs {
	fmt.Println(err)
}