extern crate serde_json;
use std::collections::BTreeMap;

fn main() {
    let yaml = r#"[{"a1": "b1", "a2": "b2", "a3": "b3"}, {"c1": "b4", "c2": "b5", "c3": "b6"}]"#;
    let vec: Vec<BTreeMap<&str, &str>> = serde_json::from_str(&yaml).map_err(|e| println!("{:?}", e)).unwrap();
    println!("{:?}", vec);
}