return c.run(s, args...)
}

func (c *funcCmd) Usage() *CmdUsage { return &c.usage }

// firstNonFlag returns a slice containing the index of the first argument in
// rawArgs that is not a flag, or nil if all arguments are flags.
func firstNonFlag(rawArgs ...string) []int {
	for i, arg := range rawArgs {
		if !strings.HasPrefix(arg, "-") {
			return []int{i}
		}
		if arg == "--" {