{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"//"}]}
            // The macro was marked with `#[rustc_builtin_macro]`.
        if let Some(builtin_name) = ext.builtin_name {
            if let Some(builtin_ext_kind) = self.builtin_macros.get(&builtin_name) {