fn usage() -> !
{
    println!("Usage: makeexpr number [number ...] target");
    ::std::process::exit(1);
}
/// Print a usage message, and exit.
Print a usage message, and exit.
Print a usage message and exit .
fn usage() -> !
{
    println!("Usage: makeexpr number [number ...] target");
    ::std::process::exit(1);
}
fn usage ( ) -> ! { println ! ( " " ) ; :: std :: process :: exit ( 1 ) ; }
Print a usage message, and exit.
Print a usage message and exit .