Minimum Breaking Example

code.rs

extern crate num;

use num::bigint::BigUint;
use std::collections::treemap::TreeSet;

fn main() {
    let primes = TreeSet<BigUint>::new();
}

errors

minwe.rs:7:18: 7:25 error: unresolved name `TreeSet`.
minwe.rs:7     let primes = TreeSet<BigUint>::new();
                            ^~~~~~~
minwe.rs:7:26: 7:33 error: unresolved name `BigUint`.
minwe.rs:7     let primes = TreeSet<BigUint>::new();
                                    ^~~~~~~
minwe.rs:7:34: 7:39 error: unresolved name `new`.
minwe.rs:7     let primes = TreeSet<BigUint>::new();
                                            ^~~~~
error: aborting due to 3 previous errors

Fixed by TreeSet::<BigUint> (with the double colon). Also note import should be std::collections::TreeSet (without treemap)