// Copyright 2015 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.

use std::mem;

pub struct X([u8]);

fn _f(x: &X) -> usize { match *x { X(ref x) =>  { x.len() } } }

fn main() {
    let b: &[u8] = &[11; 42];
    let v: &X = unsafe { mem::transmute(b) };
    assert_eq!(_f(v), 42);
}