fn next_argument(&mut self, args: &mut Args, emsg: &str) -> String {
        let arg = args.next()
            .ok_or(RuntimeError::from(emsg));

        result_or_usage(arg)
    }
/// Get next argument from a given list.
Get next argument from a given list.
Get next argument from a given list .
fn next_argument(&mut self, args: &mut Args, emsg: &str) -> String {
        let arg = args.next()
            .ok_or(RuntimeError::from(emsg));
        result_or_usage(arg)
    }
fn next_argument ( & mut self , args : & mut Args , emsg : & str ) -> String { let arg = args . next ( ) . ok_or ( RuntimeError :: from ( emsg ) ) ; result_or_usage ( arg ) }
Get next argument from a given list.
Get next argument from a given list .
&mut self
args
&mut Args
emsg
&str
&mut self
args
&mut Args
emsg
&str