{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":")"}]}
    ) -> Option<FxHashMap<EditionedFileId, Vec<HighlightedRange>>> {
        block_expr: Option<ast::BlockExpr>,
        let mut highlights: FxHashMap<EditionedFileId, Vec<_>> = FxHashMap::default();