#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(never_type)]
#![feature(variant_count)]
use std::mem;
enum Void {}
enum Foo {
    A(&'static str),
    B(i32),
    C(i32),
}
fn main() {
    assert_eq!(mem::variant_count::< Void > (), 0);
    assert_eq!(mem::variant_count::< Foo > (), 3);
    assert_eq!(mem::variant_count::< Option <!>> (), 2);
    assert_eq!(mem::variant_count::< Result <!, !>> (), 2);
}