msg := fmt.Sprintf("could not adumbrate %v: %v", subject, err)
log.Printf(msg)
return msg

msg := "some string"
fmt.Printf(msg) // warning: printf with non-constant format string and no format parameters

x := "parameter"
fmt.Printf(msg, x) // no warning: we can't validate that msg is a valid format, but this could be correct

var a []interface{}
fmt.Printf(msg, a...) // no warning: again, we can't validate that msg is a valid format, but this could be correct