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```console
$ 03_03_positional_derive --help
clap [..]
A simple to use, efficient, and full-featured Command Line Argument Parser
USAGE:
03_03_positional_derive[EXE] [NAME]
ARGS:
<NAME>
OPTIONS:
-h, --help Print help information
-V, --version Print version information
$ 03_03_positional_derive
name: None
$ 03_03_positional_derive bob
name: Some("bob")
```
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