{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//"}]}
        // Not using `FxHashMap` due to `token::TokenKind: !Eq + !Hash`.
        mut acc: i64, // `i64` because malformed code can have more closing delims than opening.
        modifier: &[(token::TokenKind, i64)],