bson 0.12.3

Encoding and decoding support for BSON in Rust
Documentation 
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extern crate bson;
use std::collections::HashMap;
fn main() {
    let mut map: HashMap<i64, i64> = HashMap::new();
    map.insert(1, 0);
    map.insert(2, 1);
    let tmp = bson::to_bson(&map).unwrap();
}