{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
        let parse_bits = |s: &'a str, kind: &'a str, cause: &'a str| {
        // Parse a bit count from a string.
            s.parse::<u64>().map_err(|err| TargetDataLayoutErrors::InvalidBits {