Defining Independent FlagSets in GoLang

Question

The Go documentation (http://golang.org/pkg/flag/) says:

The FlagSet type allows one to define independent sets of flags, such as to implement subcomm

Answer 1

Just change these code

if err := f2.Parse(os.Args[1:]); err == nil {
    fmt.Println(*reset)
}

to

f2.Parse(os.Args[1:])
fmt.Println(*reset)

but the warning is just left on the console.if u wanna remove it ,modify /usr/local/go/src/flag/flag.go and recompile the golang .. or do a copy of flag package.

　　→_→ 怀疑的眼神~~