rust/src/test/run-pass/log-knows-the-names-of-variants.rs

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#[derive(Debug)]
enum foo {
  a(usize),
  b(String),
  c,
}

#[derive(Debug)]
enum bar {
  d, e, f
}

pub fn main() {
    assert_eq!("a(22)".to_string(), format!("{:?}", foo::a(22)));
    assert_eq!("c".to_string(), format!("{:?}", foo::c));
    assert_eq!("d".to_string(), format!("{:?}", bar::d));
}