func ParseFlags(f FlagSet, prog string, args []string, positional string, stderr io.Writer) (ok bool, exitCode int) {
f.Init(prog, flag.ContinueOnError)
f.SetOutput(io.Discard)
func ParseFlags(f FlagSet, prog string, args []string, positional string, stderr io.Writer) (ok bool, exitCode int) {
f.Init(prog, flag.ContinueOnError)
f.SetOutput(io.Discard)