clap 3.0.0-rc.6

A simple to use, efficient, and full-featured Command Line Argument Parser
Documentation 
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#[macro_use]
mod macros;

pub mod app;
pub mod arg;

mod arg_group;
mod usage_parser;

pub use self::{
    app::{App, AppFlags, AppSettings},
    arg::{Arg, ArgFlags, ArgSettings, PossibleValue, ValueHint},
    arg_group::ArgGroup,
};