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//@ run-pass
#![allow(unused_variables)]
#![allow(unused_imports)]
use std::cmp::{Ord, Ordering, PartialOrd};
use std::collections::BTreeMap;
use std::iter::Iterator;
#[derive(Eq, Hash, Debug, Ord, PartialEq, PartialOrd)]
struct Zst;
fn main() {
const N: usize = 8;
for len in 0..N {
let mut tester = BTreeMap::new();
assert_eq!(tester.len(), 0);
for bit in 0..len {
tester.insert(Zst, ());
}
assert_eq!(tester.len(), if len == 0 { 0 } else { 1 });
assert_eq!(tester.iter().count(), if len == 0 { 0 } else { 1 });
assert_eq!(tester.get(&Zst).is_some(), len > 0);
tester.clear();
}
}
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