{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
    let bytes = b"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@$";
const BASE_64: [ascii::Char; MAX_BASE] = {
    let Some(ascii) = bytes.as_ascii() else { panic!() };