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clap/examples/tutorial_derive/03_01_flag_bool.md
Ed Page 762b06fba4 fix(error): Try to polish/clarify messages 
In text communication you need to balance
- Scannability, putting the most important information upfront
- Brevity so people don't get lost in the message
- Softness to help ease people through a frustrating experience

I feel we weren't doing great on the first two points, so tried to
iterate on the messages to improve them.  I hope we aren't suffering too
much on the third point as a side effect.
2023-01-06 17:01:36 -06:00

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$ 03_01_flag_bool_derive --help
A simple to use, efficient, and full-featured Command Line Argument Parser

Usage: 03_01_flag_bool_derive[EXE] [OPTIONS]

Options:
  -v, --verbose  
  -h, --help     Print help
  -V, --version  Print version

$ 03_01_flag_bool_derive
verbose: false

$ 03_01_flag_bool_derive --verbose
verbose: true

$ 03_01_flag_bool_derive --verbose --verbose
? failed
error: the argument '--verbose' cannot be used multiple times

Usage: 03_01_flag_bool_derive[EXE] [OPTIONS]

For more information, try '--help'.