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// run-pass
#![allow(dead_code)]
#![feature(box_syntax)]
#[derive(Copy, Clone)]
struct LM { resize_at: usize, size: usize }
enum HashMap<K,V> {
HashMap_(LM, Vec<(K,V)>)
}
fn linear_map<K,V>() -> HashMap<K,V> {
HashMap::HashMap_(LM{
resize_at: 32,
size: 0}, Vec::new())
}
impl<K,V> HashMap<K,V> {
pub fn len(&mut self) -> usize {
match *self {
HashMap::HashMap_(ref l, _) => l.size
}
}
}
pub fn main() {
let mut m: Box<_> = box linear_map::<(),()>();
assert_eq!(m.len(), 0);
}
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