//! How to add `no-thing` flag which is `true` by default and
//! `false` if passed.
use structopt::StructOpt;
#[derive(Debug, StructOpt)]
struct Opt {
#[structopt(long = "no-verbose", parse(from_flag = std::ops::Not::not))]
verbose: bool,
}
fn main() {
let cmd = Opt::from_args();
println!("{:#?}", cmd);
}