timClicks, 
A #rustlang tip: Parsing CLI arguments without 3rd party dependencies https://timclicks.dev/parse-cli-args-without-3rd-party-crates/
Sometimes, bringing in a third-party dependency, such as clap, to your project can feel like a bit of a burden.
For example, to improve your prospective users’ first impressions, you might want your examples to compile as quickly as possible.
That's admirable. But messages from crashing apps are not user friendly.