package main

import (
    "github.com/guonaihong/clop"
)

type Once struct {
    Debug bool `clop:"-d; --debug; once" usage:"debug mode"`
}

func main() {
    o := Once{}
    clop.Bind(&o)
}
/*
./once -debug -debug
error: The argument '-d' was provided more than once, but cannot be used multiple times
For more information try --help
*/