{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
        let comment = "```compile_fail,E0641\nlet b = 0 as *const _;\n```";
    fn test_format_docs_handles_error_codes() {
        assert_eq!(format_docs_(comment), "```rust\nlet b = 0 as *const _;\n```");