{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
        let expander = if attrs.by_key(sym::rustc_builtin_macro).exists() {
        // Case 1: builtin macros
            // `#[rustc_builtin_macro = "builtin_name"]` overrides the `macro_rules!` name.