{"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"let"}]}
        let change_ast_id = |ast_id: &mut ErasedFileAstId| {
        const OLD_FIXUP_AST_ID: ErasedFileAstId = ErasedFileAstId::from_raw(!0 - 1);
            if *ast_id == FIXUP_ERASED_FILE_AST_ID_MARKER {