Macro value 

macro_rules! value {
    () => { ... };
    ($x:expr) => { ... };
    ([]) => { ... };
    ([$elem:expr; $n:expr]) => { ... };
    ([$($x:expr),+ $(,)?]) => { ... };
    ([=>]) => { ... };
    ([$k:expr => $v:expr; $n:expr]) => { ... };
    ([$($k:expr => $v:expr),+ $(,)?]) => { ... };
}

A macro that makes creating rmpv values easier

Create an nil value by just calling value with no arguments:

value!()

Create any single Value by just calling value! with the expression that you want to convert. This uses Value::from the hood

value!(true)
value!(3)

Create an array of Values using syntax similar to vec!:

value!([]) // empty array
value!([3, 4, 2, 234, 213]);
value!([true, false, true true]);
value!([true; 10]); // repeat a value

Create a map of Values using syntax similar to ruby

value!([=>]) // empty map
value!(["Cat" => false, "Dog" => true, "Fish" => false]);
value!(["Dog" => true; 9]); // repeat a key value pair

Note: Value::Map is just a Vec<(Value, Value)>, not a HashMap