fn main() {
let an_integer = 1u;
let a_boolean = true;
let unit = ();
// copy `an_integer` into `copied_integer`
let copied_integer = an_integer;
println!("An integer: {}", copied_integer);
println!("A boolean: {}", a_boolean);
println!("Meet the unit value: {}", unit);
// The compiler warns about unused variables; these warnings can be
// silenced by prefixing the variable name with an underscore
let _unused_variable = 3u;
let noisy_unused_variable = 2u;
// FIXME ^ Prefix with an underscore to suppress the warning
}