Macro dict 

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

Construct a nvim_oxi::Dictionary from key-value pairs, supporting nested dict! usage.

Keys can be:

• string literals,
• identifiers (converted with stringify!), or
• expressions yielding String or &str.

Values: any type that implements Into<nvim_oxi::Object>