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clap 3.0.0-rc.1

A simple to use, efficient, and full-featured Command Line Argument Parser
Documentation 
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use crate::Arg;

// This test will *fail to compile* if Arg is not Send + Sync
#[test]
fn arg_send_sync() {
    fn foo<T: Send + Sync>(_: T) {}
    foo(Arg::new("test"))
}