Macro dict 

macro_rules! dict {
    { $($key:expr => $value:expr),* $(,)? } => { ... };
}

A macro for creating a Dict from literals

Example

 use libhaystack::*;
 use libhaystack::val::*;
    let dict = dict!{
        "site" => Value::make_marker(),
        "dis" => Value::make_str("Some site")
    };