Macro dict 

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

A macro for creating a Dict from literals

Keys can be bare identifiers or string/expression literals.

Bare identifiers are stringified, so site => ... becomes the key "site". If you want to use a const or other expression as the key, wrap it in parentheses, such as (KEY_SITE) => .... Values can be any type that implements Into<Value> (e.g. bool, f64, i32, &str, haystack types, or explicit Value::... expressions).

Example

 use libhaystack::*;
 use libhaystack::val::*;

    // String keys with explicit Value expressions (original syntax)
    let dict = dict!{
        "site" => Value::make_marker(),
        "dis" => Value::make_str("Some site")
    };

    // Identifier keys with native/std types
    let dict2 = dict!{
        site => Marker,
        dis => "Some site"
    };

    // Const/expression keys must be parenthesized
    const KEY_SITE: &str = "site";
    let dict3 = dict!{
        (KEY_SITE) => Marker,
    };