Rust

assert Err without implementing PartialEq

assert!(matches!(ret, Err(Error::ComingSoon)));

odbc_api_flexible_params

                // Leave ODBC to convert the parameter to the correct type
                let param: Vec<_> = params
                    .iter()
                    .map(|p| p.into_parameter())
                    .collect();
                connection.execute(&sql, param.as_slice())?

Rust command line option parser

#[derive(Debug, StructOpt)]
#[structopt(name = "wechat-user-refresh", about = "批量刷新微信用户 unionid")]
struct Opt {
    #[structopt(short="t", long="token", help="微会员企业Token, 不是微信token")]
    token: String,
    #[structopt(short="c", long="concurrency", default_value="16", help="并发数")]
    concurrency: usize,
    #[structopt(name="FILE", parse(from_os_str), help="包含 card_num,openid 格式的 csv文件")]
    file: PathBuf,
}