{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
        let head = u16::from_le_bytes(self.bytes[..2].try_into().unwrap());
    fn unpack(&self) -> Unpacked {
        let index = u32::from_le_bytes(self.bytes[2..6].try_into().unwrap());